10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
	OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended March 31, 2018

¨	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
	OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number: 1-10777

Ambac Financial Group, Inc.

(Exact name of Registrant as specified in its charter)

Delaware	13-3621676
(State of incorporation)	(I.R.S. employer identification no.)
One State Street Plaza, New York, New York	10004
(Address of principal executive offices)	(Zip code)

212-658-7470

(Registrant's telephone number, including area code)

Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See definition of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act): (Check one):

Large accelerated filer x Accelerated filer ¨ Non-accelerated filer ¨ Smaller reporting company ¨ Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes  ¨    No  x

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Sections 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.    Yes  x    No  ¨

As of May 7, 2018, 45,332,214 shares of common stock, par value $0.01 per share, of the Registrant were outstanding.

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

TABLE OF CONTENTS

		PAGE
PART I.	FINANCIAL INFORMATION
Item 1.	Unaudited Consolidated Financial Statements of Ambac Financial Group, Inc. and Subsidiaries
	Consolidated Balance Sheets (Unaudited)	1
	Consolidated Statements of Total Comprehensive Income (Loss) (Unaudited)	2
	Consolidated Statements of Stockholders' Equity (Unaudited)	3
	Consolidated Statements of Cash Flows (Unaudited)	4
	Notes to Unaudited Consolidated Financial Statements	5
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	50
	Cautionary Statement Pursuant To The Private Securities Litigation Reform Act Of 1995	50
	Executive Summary	52
	Critical Accounting Policies and Estimates	53
	Financial Guarantees in Force	53
	Results of Operations	57
	Liquidity and Capital Resources	63
	Balance Sheet	64
	Special Purpose Entities Including Variable Interest Entities	71
	Accounting Standards	71
	Ambac Assurance Statutory Basis Financial Results	71
	Ambac Assurance UK Limited Financial Results Under UK Accounting Principles	72
	Non-GAAP Financial Measures	72
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	74
Item 4.	Controls and Procedures	76
PART II.	OTHER INFORMATION
Item 1.	Legal Proceedings	76
Item 1A.	Risk Factors	76
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	77
Item 3.	Defaults Upon Senior Securities
Item 4.	Mine Safety Disclosures	77
Item 5.	Other Information	77
Item 6.	Exhibits	78
SIGNATURES		78

PART I.    FINANCIAL INFORMATION

Item 1.     Unaudited Financial Statements of Ambac Financial Group, Inc. and Subsidiaries

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Consolidated Balance Sheets

	March 31,			December 31,
(Dollars in thousands, except share data) (March 31, 2018 (Unaudited))	2018			2017
Assets:
Investments:
Fixed income securities, at fair value (amortized cost of $3,713,908 and $4,614,623)	$	3,871,938		$	4,652,172
Fixed income securities pledged as collateral, at fair value (amortized cost of $84,240 and $99,719)	84,240			99,719
Short-term investments, at fair value (amortized cost of $321,210 and $557,476)	321,119			557,270
Other investments (includes $383,687 and $396,689 at fair value)	419,896			431,630
Total investments	4,697,193			5,740,791
Cash and cash equivalents	38,485			623,703
Receivable for securities	2,376			11,177
Investment income due and accrued	20,457			16,532
Premium receivables	580,707			586,312
Reinsurance recoverable on paid and unpaid losses	38,825			40,997
Deferred ceded premium	49,631			52,195
Subrogation recoverable	1,894,778			631,213
Loans	10,643			10,358
Derivative assets	60,196			73,199
Current taxes	20,180			11,803
Insurance intangible asset	833,040			846,973
Other assets	36,332			46,614
Variable interest entity assets:
Fixed income securities, at fair value	2,955,763			2,914,145
Restricted cash	1,134			978
Loans, at fair value	11,558,331			11,529,384
Derivative assets	46,260			54,877
Other assets	3,635			1,123
Total assets	$	22,847,966		$	23,192,374
Liabilities and Stockholders’ Equity:
Liabilities:
Unearned premiums	$	762,240		$	783,155
Loss and loss expense reserves	2,139,101			4,745,015
Ceded premiums payable	36,451			37,876
Deferred taxes	34,804			33,659
Long-term debt	2,957,732			991,696
Accrued interest payable	244,199			436,984
Derivative liabilities	71,584			82,782
Other liabilities	55,209			67,583
Payable for securities purchased	8,849			1,932
Variable interest entity liabilities:
Accrued interest payable	3,005			589
Long-term debt, at fair value	12,270,124			12,160,544
Derivative liabilities	2,155,456			2,205,264
Other liabilities	47			37
Total liabilities	20,738,801			21,547,116
Commitments and contingencies (See Note 12)
Stockholders’ equity:
Preferred stock, par value $0.01 per share; 20,000,000 shares authorized shares; issued and outstanding shares—none	—			—
Common stock, par value $0.01 per share; 130,000,000 shares authorized; issued and outstanding shares: 45,365,170 and 45,275,982	454			453
Additional paid-in capital	204,172			199,560
Accumulated other comprehensive income (loss)	99,476			(52,239		)
Retained earnings	1,541,464			1,233,845
Treasury stock, shares at cost: 32,956 and 24,816	(511		)	(471		)
Total Ambac Financial Group, Inc. stockholders’ equity	1,845,055			1,381,148
Noncontrolling interest	264,110			264,110
Total stockholders’ equity	2,109,165			1,645,258
Total liabilities and stockholders’ equity	$	22,847,966		$	23,192,374

See accompanying Notes to Unaudited Consolidated Financial Statements

| Ambac Financial Group, Inc. 12018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Consolidated Statements of Total Comprehensive Income (Loss) (Unaudited)

	Three Months Ended March 31,
(Dollars in thousands, except share data)	2018			2017
Revenues:
Net premiums earned	$	30,883		$	47,613
Net investment income:
Securities available-for-sale and short-term	110,551			73,150
Other investments	(311		)	8,409
Total net investment income	110,240			81,559
Other-than-temporary impairment losses:
Total other-than-temporary impairment losses	(341		)	(21,154		)
Portion of other-than-temporary impairment recognized in other comprehensive income	42			17,212
Net other-than-temporary impairment losses recognized in earnings	(299		)	(3,942		)
Net realized investment gains (losses)	4,862			(4,896		)
Change in fair value of credit derivatives:
Realized gains and other settlements	106			199
Unrealized gains (losses)	(452		)	853
Net change in fair value of credit derivatives	(346		)	1,052
Net gains (losses) on interest rate derivatives	25,537			(1,514		)
Net realized gains (losses) on extinguishment of debt	3,115			2,741
Other income (expense)	(509		)	58
Income (loss) on variable interest entities	574			3,701
Total revenues	174,057			126,372
Expenses:
Losses and loss expenses (benefit)	(247,395		)	135,011
Insurance intangible amortization	28,636			37,525
Operating expenses	36,434			28,124
Interest expense	48,073			31,572
Total expenses	(134,252		)	232,232
Pre-tax income (loss)	308,309			(105,860		)
Provision for income taxes	2,605			19,581
Net income (loss) attributable to common stockholders	$	305,704		$	(125,441	)
Other comprehensive income (loss), after tax:
Net income (loss)	$	305,704		$	(125,441	)
Unrealized gains (losses) on securities, net of income tax provision (benefit) of ($1,708) and $0	122,304			21,335
Gains (losses) on foreign currency translation, net of income tax provision of $0 and $0	32,056			12,593
Credit risk changes of fair value option liabilities, net of income tax provision of $230 and $0	1,114			—
Changes to postretirement benefit, net of income tax of $0 and $0	(859		)	2,287
Total other comprehensive income (loss), net of income tax	154,615			36,215
Total comprehensive income (loss) attributable to Ambac Financial Group, Inc.	$	460,319		$	(89,226	)
Net income (loss) per share attributable to Ambac Financial Group, Inc. common stockholders
Basic	$	6.72		$	(2.77	)
Diluted	$	6.70		$	(2.77	)

See accompanying Notes to Unaudited Consolidated Financial Statements

| Ambac Financial Group, Inc. 22018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Consolidated Statements of Stockholders’ Equity (Unaudited)

				Ambac Financial Group, Inc.
(Dollars in thousands)	Total			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Preferred Stock		Common Stock		Additional Paid-in Capital		Common Stock Held in Treasury, at Cost			Noncontrolling Interest
Balance at January 1, 2018	$	1,645,258		$	1,233,845		$	(52,239	)	$	—	$	453	$	199,560	$	(471	)	$	264,110
Total comprehensive income	460,319			305,704			154,615			—		—		—		—			—
Adjustment to initially apply ASU 2016-01	—			2,900			(2,900		)	—		—		—		—			—
Stock-based compensation	4,612			—			—			—		—		4,612		—			—
Cost of shares (acquired) issued under equity plan	(1,025		)	(985		)	—			—		—		—		(40		)	—
Issuance of common stock	1			—			—			—		1		—		—			—
Balance at March 31, 2018	$	2,109,165		$	1,541,464		$	99,476		$	—	$	454	$	204,172	$	(511	)	$	264,110
Balance at January 1, 2017	$	1,978,024		$	1,557,681		$	(38,990	)	$	—	$	452	$	195,267	$	(496	)	$	264,110
Total comprehensive income	(89,226		)	(125,441		)	36,215			—		—		—		—			—
Adjustment to initially apply ASU 2016-09	(137		)	(137		)	—			—		—		—		—			—
Stock-based compensation	1,521			—			—			—		—		1,521		—			—
Cost of shares (acquired) issued under equity plan	(1,267		)	(706		)	—			—		—		—		(561		)	—
Issuance of common stock	1			—			—			—		1		—		—			—
Balance at March 31, 2017	$	1,888,916		$	1,431,397		$	(2,775	)	$	—	$	453	$	196,788	$	(1,057	)	$	264,110

See accompanying Notes to Unaudited Consolidated Financial Statements

| Ambac Financial Group, Inc. 32018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Consolidated Statements of Cash Flows (Unaudited)

	Three Months Ended March 31,
(Dollars in thousands)	2018			2017
Cash flows from operating activities:
Net income (loss) attributable to common stockholders	$	305,704		$	(125,441	)
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	181			270
Amortization of bond premium and discount	(77,427		)	(36,178		)
Share-based compensation	4,612			1,521
Deferred income taxes	1,145			26
Current income taxes	(8,439		)	11,550
Unearned premiums, net	(18,329		)	(36,272		)
Losses and loss expenses, net	(1,371,840		)	131,188
Ceded premiums payable	(1,425		)	(2,328		)
Investment income due and accrued	(3,926		)	(1,250		)
Premium receivables	5,601			8,630
Accrued interest payable	(82,992		)	4,866
Amortization of insurance intangible assets	28,636			37,525
Net mark-to-market (gains) losses	452			(853		)
Net realized investment gains	(4,862		)	4,896
Other-than-temporary impairment charges	299			3,942
(Gain) loss on extinguishment of debt	(3,115		)	(2,741		)
Variable interest entity activities	(574		)	(3,701		)
Derivative assets and liabilities	438			(101		)
Other, net	34,299			(337		)
Net cash used in operating activities	(1,191,562		)	(4,788		)
Cash flows from investing activities:
Proceeds from sales of bonds	296,078			305,541
Proceeds from matured bonds	103,995			227,741
Purchases of bonds	(77,469		)	(439,473		)
Proceeds from sales of other invested assets	31,327			121,353
Purchases of other invested assets	(11,758		)	(139,561		)
Change in short-term investments	236,262			83,550
Change in cash collateral receivable	(979		)	9,615
Proceeds from paydowns of consolidated VIE assets	79,917			64,946
Other, net	(377		)	(1,189		)
Net cash provided by investing activities	656,996			232,523
Cash flows from financing activities:
Net proceeds from issuance of Tier II notes	240,000			—
Paydowns of a secured borrowing	(8,797		)	(10,355		)
Payments for investment agreement draws	—			(82,358		)
Payments for extinguishment of long-term debt	(191,258		)	(43,666		)
Payments for debt issuance costs	(9,221		)	—
Tax payments related to shares withheld for share-based compensation plans	(1,025		)	(1,268		)
Payments of consolidated VIE liabilities	(79,917		)	(62,672		)
Net cash used in financing activities	(50,218		)	(200,319		)
Effect of foreign exchange on cash, cash equivalents and restricted cash	(278		)	463
Net cash flow	(585,062		)	27,879
Cash, cash equivalents, and restricted cash at beginning of period	624,681			95,898
Cash, cash equivalents, and restricted cash at end of period	$	39,619		$	123,777

See accompanying Notes to Unaudited Consolidated Financial Statements

| Ambac Financial Group, Inc. 42018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

1. BACKGROUND AND BUSINESS DESCRIPTION

Ambac Financial Group, Inc. (“Ambac” or the “Company”), headquartered in New York City, is a financial services holding company incorporated in the state of Delaware on April 29, 1991.

Ambac provides financial guarantee insurance policies through its principal operating subsidiary, Ambac Assurance Corporation (“Ambac Assurance" or "AAC") and its wholly owned subsidiary, Ambac Assurance UK Limited (“Ambac UK”). Insurance policies issued by Ambac Assurance and Ambac UK generally guarantee payment when due of the principal and interest on the obligations guaranteed. Ambac also has another wholly-owned subsidiary, Everspan Financial Guarantee Corp. (“Everspan”), which has been in runoff since its acquisition in 1997. The deterioration of Ambac Assurance’s financial condition resulting from losses in its insured portfolio since 2007 has prevented Ambac Assurance and Ambac UK from being able to write new business. The inability to write new business has and will continue to negatively impact Ambac’s future operations and financial results. Ambac Assurance’s ability to pay dividends and, as a result, Ambac’s liquidity, have been significantly restricted by the deterioration of Ambac Assurance’s financial condition and by the terms of the Settlement Agreement, dated as of June 7, 2010 (the "Settlement Agreement"), by and among Ambac Assurance, Ambac Credit Products LLC (“ACP”), Ambac and certain counterparties to credit default swaps with ACP that were guaranteed by Ambac Assurance. Ambac Assurance is also restricted in its ability to pay dividends pursuant to regulatory restrictions, the Stipulation and Order (as described in Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017) and the terms of its Auction Market Preferred Shares. It is highly unlikely that Ambac Assurance will be able to make dividend payments to Ambac for the foreseeable future.

Ambac also provides other financial products through subsidiaries of Ambac Assurance. These products include interest rate swaps, funding conduits, and investment agreements (until the first quarter of 2017) that were provided principally to clients that were also provided financial guarantee policies. These financial products have been in active run-off since 2007.

Management reviews financial information, allocates resources and measures financial performance on a consolidated basis. As a result, the Company has a single reportable segment.

In February 2018, Ambac achieved one of its key strategic priorities, the exit from rehabilitation of the Segregated Account.  Having accomplished this milestone, Ambac will continue to pursue and prioritize its remaining key strategic priorities, namely:

• Active runoff of Ambac Assurance and its subsidiaries through transaction terminations, policy commutations, settlements and restructurings, with a focus on our watch list credits and known and potential future adversely classified credits, that we believe will improve our risk profile, and maximizing the risk-adjusted return on invested assets;

• Ongoing rationalization of Ambac's and its subsidiaries' capital and liability structures;

• Loss recovery through active litigation management and exercise of contractual and legal rights;

• Ongoing review of organizational effectiveness and efficiency of the operating platform; and

• Evaluation of opportunities in certain business sectors that meet acceptable criteria that will generate long-term stockholder value with attractive risk-adjusted returns.

With respect to our new business strategy, we have identified certain business sectors, adjacent to Ambac's core business, in which future opportunities will be evaluated. The evaluation will be conducted through a measured and disciplined approach to identify opportunities that are synergistic to Ambac, match Ambac's core competencies, are rapidly scalable or available through mergers and acquisitions and that may allow for the utilization of Ambac's net operating loss carry-forwards.  Although we are exploring new business opportunities, no assurance can be given that we will be able to execute or obtain the financial and other resources that may be required to finance the acquisition or development of any new businesses or assets. Furthermore, the execution of Ambac’s objective to increase the value of its investment in Ambac Assurance is subject to the rights of OCI under the Stipulation and Order, which requires OCI to approve certain actions taken by or in respect of Ambac Assurance, as well as the restrictions in the Settlement Agreement. Opportunities for remediating losses on poorly performing insured transactions also depend on market conditions, including the perception of Ambac Assurance’s creditworthiness, the structure of the underlying risk and associated policy as well as other counterparty specific factors. Decisions by OCI could impair Ambac’s ability to execute certain of its strategies. Ambac Assurance's ability to commute policies or purchase certain investments may also be limited by available liquidity. Due to these factors, as well as uncertainties relating to the ability of Ambac Assurance to deliver value to Ambac, the value of our securities remains speculative.

The Segregated Account

In March 2010, Ambac Assurance established a Segregated Account pursuant to Wisc. Stat. §611.24 (2) (the “Segregated Account”) to segregate certain segments of Ambac Assurance’s liabilities, and the Office of the Commissioner of Insurance for the State of Wisconsin (“OCI” (which term shall be understood to refer to such office as regulator of Ambac Assurance and to refer to the Commissioner of Insurance for the State of

| Ambac Financial Group, Inc. 52018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Wisconsin as rehabilitator of the Segregated Account (the “Rehabilitator”), as the context requires)) commenced rehabilitation proceedings in the Dane County, Wisconsin Circuit Court (the “Rehabilitation Court”) with respect to the Segregated Account (the “Segregated Account Rehabilitation Proceedings”) in order to permit OCI to facilitate an orderly run-off and/or settlement of the liabilities allocated to the Segregated Account pursuant to the provisions of the Wisconsin Insurers Rehabilitation and Liquidation Act. On October 8, 2010, OCI filed a plan of rehabilitation for the Segregated Account (the “Segregated Account Rehabilitation Plan”) in the Rehabilitation Court, which was confirmed by the Rehabilitation Court on January 24, 2011. On June 11, 2014, the Rehabilitation Court approved amendments to the Segregated Account Rehabilitation Plan and the Segregated Account Rehabilitation Plan, as amended, became effective on June 12, 2014. Policy obligations not allocated to the Segregated Account remained in the General Account of Ambac Assurance, and such policies in the General Account were not subject to and, therefore, were not directly impacted by the Segregated Account Rehabilitation Plan.

On February 12, 2018, Ambac successfully concluded the rehabilitation of the Segregated Account pursuant to an amendment of the Segregated Account Rehabilitation Plan (the "Second Amended Plan of Rehabilitation"). The conclusion of the rehabilitation followed the successful completion of Ambac's surplus note exchange offers and consent solicitation, which, together with the satisfaction of all remaining conditions precedent to the effectiveness of the Second Amended Plan of Rehabilitation, including the discharge of all unpaid policy claims of the Segregated Account, including accretion amounts thereon ("Deferred Amounts"), completed the restructuring transactions (the "Rehabilitation Exit Transactions") announced on July 19, 2017, as more fully described in Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

In exchange for an effective consideration package of 40% cash, 41% Secured Notes (as defined below) and 12.5% General Account Surplus Notes (as defined below), paid in respect of outstanding Deferred Amounts and General Account Surplus Notes, Ambac Assurance received the following benefits as a result of the completion of the Rehabilitation Exit Transactions:

• Satisfaction and discharge of all outstanding Deferred Amounts (including accretion) of the Segregated Account, totaling $3,856,992;

• Cancellation of $552,320 in principal amount outstanding, plus accrued and unpaid interest of $257,200 thereon, of AAC's 5.1% surplus notes due 2020 (the "General Account Surplus Notes"); and

• An effective discount of 6.5% on Deferred Amounts (applied first against accretion) and the outstanding amount of principal and accrued and unpaid interest on tendered General Account Surplus Notes

Ambac received $0.91 in principal amount of Secured Notes for each $1.00 of Deferred Amounts that it held, and provided a $0.09 discount in full satisfaction and discharge of its Deferred Amount claims. Ambac did not participate in the voluntary surplus note exchange offers.

A newly formed special purpose entity Ambac LSNI, LLC ("Ambac LSNI") issued new secured notes (the “Secured Notes”), secured by all assets of the special purpose entity, which include a note issued by Ambac Assurance to the special purpose entity (the "Ambac Note"), which is secured by a pledge of Ambac Assurance’s right, title and interest in up to the first $1,400,000 of proceeds (net of reinsurance) from certain litigations in which Ambac Assurance seeks redress for breaches of representations and warranties and/or fraud related to residential mortgage-backed securitizations (the “RMBS Litigations”). In addition, the Ambac Note is secured by cash and securities having a market value of $367,816 as of March 31, 2018. Ambac Assurance also pledged for the benefit of the holders of Secured Notes (other than Ambac Assurance) the proceeds of the Secured Notes held by Ambac Assurance from time to time, and issued a financial guaranty insurance policy to a trustee for the benefit of holders of Secured Notes irrevocably guarantying all principal and interest payments in respect of the Secured Notes as and when such payments become due and owing.

Prior to the Rehabilitation Exit Transactions, Ambac and Ambac Assurance owned securities that were insured by Ambac Assurance and allocated to the Segregated Account. As a result of the Rehabilitation Exit Transactions, Ambac Assurance and Ambac received $643,583 and $124,881, respectively, of par amount of secured notes issued by Ambac LSNI. Such secured notes are reported in Investments in the Consolidated Balance Sheets at their fair value.

Ambac Assurance also received $240,000 in cash proceeds from the issuance of notes secured by recoveries from RMBS Litigations in excess of $1.6 billion ("Tier 2 Notes").

Receipt of Requisite Consents for Bank Settlement Agreement Waiver and Amendment

Ambac received sufficient consents from holders of General Account Surplus Notes for a waiver and amendment (the "BSA Waiver and Amendment") of the Settlement Agreement. Among other provisions, the BSA Waiver and Amendment includes amendments to the Settlement Agreement that (i) eliminate the requirement for Ambac Assurance to have "unaffiliated qualified directors" on its Board of Directors; (ii) eliminate the prohibition on new business activities; (iii) modify the restrictions on the incurrence of indebtedness and other material obligations; (iv) modify the restrictions on liens securing permitted indebtedness; (v) modify restrictions applicable to junior surplus notes; and (vi) modify restrictions on mergers or similar transactions.

Regulatory Approval of the Rehabilitation Exit Transactions, including a partial interest payment on Surplus Notes

OCI provided all approvals necessary to consummate the Rehabilitation Exit Transactions, to give effect to the BSA Waiver and Amendment, and to make a $13,501 pro-rata interest payment, representing approximately six months of interest, on the outstanding principal and accrued

| Ambac Financial Group, Inc. 62018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

and unpaid interest of General Account Surplus Notes that remained outstanding (of which $2,618 was received by Ambac for surplus notes that it owns that are considered extinguished for accounting purposes) after the closing of the Rehabilitation Exit Transactions on February 12, 2018. 

For more information about the Segregated Account rehabilitation and the Rehabilitation Exit Transactions and related matters, please refer to Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

2. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

The Company has disclosed its significant accounting policies in Note 2. Basis of Presentation and Significant Accounting Policies in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. The following significant accounting policies provide an update to those included in the Company’s Annual Report on Form 10-K.

Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial reporting and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and disclosures required by GAAP for annual periods. These consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2017. The accompanying consolidated financial statements have not been audited by an independent registered public accounting firm in accordance with the standards of the Public Company Accounting Oversight Board (U.S.), but in the opinion of management such financial statements include all adjustments necessary for the fair presentation of the Company’s consolidated financial position and results of operations. All intercompany balances and transactions have been eliminated. The results of operations for the three months ended March 31, 2018 may not be indicative of the results that may be expected for the year ending December 31, 2018. The December 31, 2017 consolidated balance sheet was derived from audited financial statements.

The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. As additional information becomes available or actual amounts become determinable, the recorded estimates are revised and reflected in operating results.

Foreign Currency:

Financial statement accounts expressed in foreign currencies are translated into U.S. dollars in accordance with the Foreign Currency Matters Topic of the ASC. The functional currencies of Ambac's subsidiaries are the local currencies of the country where the respective subsidiaries are based, which are also the primary operating environments in which the subsidiaries operate.

Foreign currency translation: Functional currency assets and liabilities of Ambac’s foreign subsidiaries are translated into U.S. dollars using exchange rates in effect at the balance sheet dates and the related translation adjustments, net of deferred taxes, are included as a component of Accumulated Other Comprehensive Income in Stockholders' Equity. Functional currency operating results of foreign subsidiaries are translated using average exchange rates.

Foreign currency transactions: The impact of non-functional currency transactions and the remeasurement of non-functional currency assets and liabilities into the respective subsidiaries' functional currency (collectively "foreign currency transactions gains/(losses)") are $5,018 and $6,465 for the three months endedMarch 31, 2018 and 2017. Foreign currency transactions gains/(losses) are primarily the result of remeasuring Ambac UK's assets and liabilities denominated in currencies other than its functional currency, primarily the U.S. dollar and the Euro. The significant components of foreign currency transaction gains/(losses), including the respective classifications in the Consolidated Statement of Total Comprehensive Income, are as follows:

• Remeasurement of loss reserves, classified in Loss and loss expenses, in the amount of $11,016 and $5,827 for the three months endedMarch 31, 2018 and 2017, respectively;

• Realized gain (losses) from the sale of investment securities and the unrealized gains (losses) on trading and short-term investment securities, classified in Net realized investment gains, in the amount of $(4,804) and $1,916 for the three months endedMarch 31, 2018 and 2017, respectively;

• Remeasurement of premium receivables, classified in Other income, in the amount of $(1,387) and $(560) for the three months endedMarch 31, 2018 and 2017, respectively; and

• Remeasurement of credit derivative liabilities, classified in Net change in fair value of credit derivative, in the amount of $(25) and $(706) for the three months endedMarch 31, 2018 and 2017, respectively.

| Ambac Financial Group, Inc. 72018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Supplemental Disclosure of Cash Flow Information

	Three Months Ended March 31,
	2018	2017
Cash paid during the period for:
Income taxes	9,718	8,295
Interest on long-term debt and investment agreements	100,958	20,496
Non-cash financing activities:
Decrease in long-term debt as a result of an exchange for investment securities	—	55,426
Reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets to the Consolidated Statements of Cash Flows:
Cash and cash equivalents	38,485	118,772
Restricted cash	1,134	5,005
Total cash, cash equivalents, and restricted cash shown on the Consolidated Statements of Cash Flows	39,619	123,777

In addition to the non-cash financing activities disclosed in the above table, the Rehabilitation Exit Transactions involved the exchange of cash and non-cash consideration for the discharge of all Deferred Amounts and cancellation of certain General Account Surplus Notes. Refer to Note 1. Background and Business Description of this Form 10-Q and Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for further details of the transactions.

Reclassifications:

Reclassifications have been made to prior years' amounts to conform to the current year's presentation. Such reclassifications are primarily the result of certain new standards discussed in the Recently Adopted Accounting Standards section below.

Recently Adopted Accounting Standards:

Effective January 1, 2018, Ambac adopted the following accounting standards:

Stock Compensation--Scope of Modification Accounting

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718) - Scope of Modification Accounting. The ASU provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Entities will apply the modification accounting guidance if the value, vesting conditions or classification of the award changes. The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this ASU. The adoption of this ASU did not have an impact on Ambac's financial statements.

Net Periodic Pension and Postretirement Costs

In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715) - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The objective of the ASU is to increase transparency in the reporting of net pension cost and net postretirement cost (collectively "net benefit cost"). The ASU requires that the service cost component of net benefit cost be reported on the same line item as other compensation costs arising from services rendered by employees. It further requires that the other components of net benefit costs (i.e. interest costs, amortization of prior service cost, etc.) be presented separately from the service cost component and outside the subtotal of income from operations, if one is presented. Prior to adoption of this ASU, Ambac reported all postretirement costs in Operating expenses on the Consolidated Statements of Total Comprehensive Income (Loss). Adoption of this ASU resulted in a reclassification of other non-service related costs from Operating expenses to Other income (expense) of $144 for the three months ended March 31, 2017.

Restricted Cash

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash. Prior to the effective date of this ASU, GAAP did not include specific guidance on the cash flow classification and presentation of changes in restricted cash and restricted cash flow equivalents other than limited guidance for non-for-profit entities. This ASU is intended to resolve diversity in practice in the classification of changes in restricted cash and restricted cash flow equivalents on the statement of cash flows. The ASU requires that restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning and ending period amounts on the statement of cash flows, along with certain disclosures. Adoption of this ASU resulted in the inclusion of restricted cash activity related to consolidated VIEs on the Consolidated Statements of Cash Flows for the three months ended March 31, 2018 and March 31, 2017. Also refer to the Supplemental Disclosure of Cash Flow Information section above for the reconciliation of cash, cash equivalents, and restricted cash reported on the Consolidated Statement of Position that sum to the total of the same such amounts on the Consolidated Statements of Cash Flows.

| Ambac Financial Group, Inc. 82018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Income Taxes

In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740) - Intra-Entity Transfers of Assets Other Than Inventory. Prior to the effective date of this ASU, GAAP prohibited the recognition of current and deferred income taxes for intercompany transfers of assets until the asset had been sold to an outside party. The ASU requires companies to recognize the income tax effects of intercompany sales and transfers of assets other than inventory, as income tax expense (or benefit) in the period in which the transfer occurs. The adoption of this ASU did not have an impact on Ambac's financial statements.

Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments. The ASU resolves diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. Transactions addressed in the ASU that are potentially relevant to Ambac include the following:

• Debt prepayment or debt extinguishment costs - Such payments will be classified as a financing cash outflow.

• Settlement of zero-coupon debt or other debt with coupon rates that are insignificant in relation to the effective interest rate of the borrowing - The portion of the cash payment attributable to accreted interest will be classified as an operating cash outflow and the portion attributable to the principal will be classified as a financing cash outflow.

• Distributions from equity-method investees - An entity will elect one of the two following approaches. Under the "cumulative earnings approach": i) distributions received up to the amount of cumulative earnings recognized will be treated as returns on investments and classified as cash inflows from operating activities and ii) distributions received in excess of earnings recognized will be treated as returns of investments and classified as cash inflows from investing activities. Under the "nature of the distribution" approach, distributions received will be classified based on the nature of the activity that generated the distribution (i.e. classified as a return on investment or return of investment), when such information is available to the investor.

• Beneficial interests in securitization transactions - Any beneficial interests obtained in financial assets transferred to an unconsolidated securitization entity will be disclosed as a non-cash investing activity. Subsequent cash receipts from the beneficial interests in previously transferred trade receivables will be classified as cash inflows from investing activities.

The adoption of this ASU did not have an impact on Ambac's financial statements.

Recognition and Measurement of Financial Assets and Liabilities

In January 2016, the FASB issued ASC 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU makes the following targeted changes for financial assets and liabilities: i) requires equity investments with readily determinable fair values to be measured at fair value with changes recognized in net income; ii) simplifies the impairment assessment of equity securities without readily determinable fair values using a qualitative approach; iii) eliminates disclosure of the method and significant assumptions used to fair value instruments measured at amortized cost on the balance sheet; iv) requires the use of the exit price notion when measuring the fair value of instruments for disclosure purposes; v) for financial liabilities where the fair value option has been elected, requires the portion of the fair value change related to instrument-specific credit risk, to be separately reported in other comprehensive income; vi) requires the separate presentation of financial assets and liabilities by measurement category and form of financial asset (liability) on the balance sheet or accompanying notes; and vii) clarifies that the evaluation of a valuation allowance on a deferred tax asset related to available-for-sale securities should be performed in combination with the entity's other deferred tax assets.

With respect to item (v) above, Ambac has elected the fair value option for all VIE financial liabilities. For these VIE liabilities this ASU has resulted in a cumulative-effect reclassification of $2,900, net of deferred tax of $590, between Retained earnings and Accumulated other comprehensive income, with no net change to Total stockholders' equity as of January 1, 2018. For the three months ended March 31, 2018 and going forward, the instrument-specific credit risk of fair value changes in VIE liabilities has been and will be reported in Accumulated other comprehensive income in accordance with this ASU, with all other fair value changes continuing to be reported through net income. There was no material impact on Ambac's financial statements for the other provisions of this ASU.

Revenue recognition

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) that amends the accounting guidance for recognizing revenue for contracts with customers to transfer goods and contracts for the transfer of non-financial assets unless those contracts are within the scope of other accounting standards. As this ASU does not apply to insurance contracts and most financial instruments management determined there was no impact on Ambac's financial statements.

Future Application of Accounting Standards:

Equity-linked instruments with down round features

In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260) and Derivatives and Hedging (Topic 815) - Accounting for Certain Financial Instruments with Down Round Features. Equity-linked instruments, such as warrants and convertible instruments may contain down round features that result in the strike price being reduced on the basis of the pricing of future equity offerings. Under the ASU, a down round

| Ambac Financial Group, Inc. 92018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

feature will no longer require a freestanding equity-linked instrument (or embedded conversion option) to be classified as a liability that is remeasured at fair value through the income statement (i.e. marked-to-market). However, other features of the equity-linked instrument (or embedded conversion option) must still be evaluated to determine whether liability or equity classification is appropriate. Equity classified instruments are not marked-to-market. For earnings per share ("EPS") reporting, the ASU requires companies to recognize the effect of the down round feature only when it is triggered by treating it as a dividend and as a reduction of income available to common stockholders in basic EPS. The amendments in this ASU are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in any interim period. Ambac will adopt this ASU on January 1, 2019. The adoption of this ASU is not expected to have a consequential impact on Ambac's financial statements.

Premium Amortization on Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20) - Premium Amortization on Purchased Callable Debt Securities. The ASU shortens the amortization period for the premium on callable debt securities to the earliest call date. Under current GAAP, a reporting entity generally amortizes the premium as yield adjustment over the contractual life (i.e. maturity) of the debt security and if that debt security is called, the entity would record a loss equal to the unamortized premium. The ASU does not change the accounting for callable debt securities held at a discount, which will continue to be amortized to maturity. ASU 2017-08 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. The ASU must be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Ambac will adopt this ASU on January 1, 2019 and we are evaluating its impact on Ambac's financial statements.

Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments. This ASU significantly affects how reporting entities will measure credit losses for financial assets that are not accounted for at fair value through net income, which include loans, debt securities, trade receivables, net investments in leases, and certain off-balance sheet credit exposures. For financial assets measured at amortized cost, the ASU replaces the "incurred loss" model, which generally delayed recognition of the full amount of credit losses until the loss was probable of occurring, with an "expected loss" model, which reflects an entity's current estimate of all expected credit losses. Expected credit losses for amortized cost assets will be recorded as a valuation allowance, with subsequent increases or decreases in the allowance reflected in the income statement each period. For available-for-sale debt securities, credit losses under the ASU will be measured similarly to current GAAP. However, under the ASU, credit losses for available-for-sale securities will be recorded as a valuation allowance (similar to the amortized cost assets approach described above), rather than as a direct write-down of the security as is required under current GAAP. As a result, improvements to estimated credit losses for available-for-sale debt securities will be recognized immediately in the income statement rather than as interest income over time. The ASU is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted as of the fiscal year beginning after December 15, 2018. Ambac has not determined whether it will early adopt this ASU and we are currently evaluating its impact on Ambac's financial statements. The significant implementation matters to be addressed include identifying the inventory of financial assets that will be affected by this standard, identifying new data requirements and data sources for implementing the expected loss model for those instruments not already using this model and identifying and documenting accounting process changes, including related controls.

Leases

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main difference between current U.S. GAAP and this ASU is the recognition of lease assets and lease liabilities for those leases classified as operating leases. For operating leases, a lessee is required to: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the balance sheet, 2) recognize a single lease cost, calculated so that the cost is allocated over the lease term generally on a straight-line basis and 3) classify all cash payment within operating activities in the statement of cash flows. The ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The transition guidance requires lessees to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach which include a number of optional practical expedients. We will adopt ASU 2015-02 on January 1, 2019. We are evaluating the impact of this ASU, including the transitional practical expedients, on Ambac's financial statements. We believe Ambac's office leases will be the most significantly impacted by this ASU. The significant implementation matters to be addressed include identifying the remaining inventory of leases (i.e. equipment and other) that will be affected by this standard and identifying and documenting accounting process changes, including related controls.

3. SPECIAL PURPOSE ENTITIES, INCLUDING VARIABLE INTEREST ENTITIES

Ambac, with its subsidiaries, has engaged in transactions with special purpose entities, including VIEs, in various capacities.

• Ambac most commonly provides financial guarantees, including credit derivative contracts, for various debt obligations issued by special purpose entities, including VIEs ("FG VIEs").

• Ambac sponsors special purpose entities that issued notes to investors for various purposes.

• Ambac monetized its ownership of the junior surplus note issued to it by the Segregated Account by depositing the junior surplus note into a newly formed VIE trust in exchange for cash and an owner trust certificate, which represents Ambac's right to residual cash flows from the junior surplus note.

| Ambac Financial Group, Inc. 102018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

• Ambac is an investor in collateralized loan obligations, mortgage-backed and other asset-backed securities issued by VIEs and its ownership interest is generally insignificant to the VIE and/or Ambac does not have rights that direct the activities that are most significant to such VIE.

FG VIEs:

Ambac’s subsidiaries provide financial guarantees in respect of assets held or debt obligations of special purpose entities, including VIEs. Ambac’s primary variable interest exists through this financial guarantee insurance or credit derivative contract. The transaction structures provide certain financial protection to Ambac. Generally, upon deterioration in the performance of a transaction or upon an event of default as specified in the transaction legal documents, Ambac will obtain certain loss remediation rights. These rights may enable Ambac to direct the activities of the entity that most significantly impact the entity’s economic performance.

We determined that Ambac’s subsidiaries generally have the obligation to absorb a FG VIE's expected losses given that they have issued financial guarantees supporting certain liabilities (and in some cases certain assets). As further described below, we consolidated certain FG VIEs because: (i) we determined, for certain transactions that experienced the aforementioned performance deterioration, that Ambac’s subsidiaries had the power, through voting rights or similar rights, to direct the activities that most significantly impact the VIE’s economic performance because certain triggers had been breached in these transactions resulting in Ambac's subsidiaries' ability to exercise certain loss remediation activities or (ii) due to the passive nature of the VIEs’ activities, Ambac’s subsidiaries’ contingent loss remediation rights upon a breach of certain triggers in the future is considered to be the power to direct the activities that most significantly impact the VIEs’ economic performance. With respect to existing VIEs involving Ambac financial guarantees, Ambac is generally required to consolidate a VIE in the period that applicable triggers result in Ambac having control over the VIE’s most significant economic activities. FG VIEs which are consolidated include recourse liabilities and, in some cases, may include non-recourse liabilities. FG VIEs' liabilities that are insured by the Company are with recourse, because the Company guarantees the payment of principal and interest to the extent there is a shortfall in the FG VIEs' assets. FG VIEs' liabilities that are not insured by the Company are without recourse, because the payment of principal and interest of these liabilities is wholly dependent on the performance of the FG VIEs' assets. The Company’s exposure to consolidated FG VIEs is limited to the financial guarantees issued for recourse liabilities and any additional variable interests held by Ambac.

In connection with the exit from rehabilitation of the Segregated Account, as further described in Note 1. Background and Business Description and in Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, Ambac evaluated the consolidation of certain VIEs. Under the Stipulation and Order, the OCI retained the authority requiring Ambac Assurance to obtain their approval with respect to the exercise of certain control rights in connection with certain policies that had previously been allocated to the Segregated Account. Accordingly, Ambac was not required to consolidate any additional VIEs as a result of the Segregated Account's exit from rehabilitation. A VIE is deconsolidated in the period that Ambac no longer has such control, which could occur in connection with the execution of remediation activities on the transaction or amortization of insured exposure, either of which may reduce the degree of Ambac’s control over a VIE. Assets and liabilities of FG VIEs that are consolidated are reported within Variable interest entity assets or Variable interest entity liabilities on the Consolidated Balance Sheets. The net results from such FG VIEs are reported within Income (loss) on variable interest entities in the Consolidated Statements of Total Comprehensive Income (Loss).

Upon initial consolidation of a FG VIE, we recognize a gain or loss in earnings for the difference between: (i) the fair value of the consideration paid, the fair value of any non-controlling interests and the reported amount of any previously held interests and (ii) the net amount, as measured on a fair value basis, of the assets and liabilities consolidated. Upon deconsolidation of a FG VIE, we recognize a gain or loss for the difference between: (i) the fair value of any consideration received, the fair value of any retained non-controlling investment in the VIE and the carrying amount of any non-controlling interest in the VIE and (ii) the carrying amount of the VIE’s assets and liabilities. Gains or losses from consolidation and deconsolidation that are reported in earnings are reported within Income (loss) on variable interest entities on the Consolidated Statements of Total Comprehensive Income (Loss).

The impact of consolidating such FG VIEs on Ambac’s balance sheet is the elimination of transactions between the consolidated FG VIEs and Ambac’s operating subsidiaries and the inclusion of the FG VIE’s third party assets and liabilities. For a financial guarantee insurance policy issued to a consolidated VIE, Ambac does not reflect the financial guarantee insurance policy in accordance with the related insurance accounting rules under the Financial Services – Insurance Topic of the ASC. Consequently, upon consolidation, Ambac eliminates the insurance assets and liabilities associated with the policy from the Consolidated Balance Sheets. Such insurance assets and liabilities may include premium receivables, reinsurance recoverable, deferred ceded premium, subrogation recoverable, unearned premiums, loss and loss expense reserves, ceded premiums payable and insurance intangible assets. For investment securities owned by Ambac that are debt instruments issued by the VIE, the investment securities balance is eliminated upon consolidation.

As of March 31, 2018 consolidated FG VIE assets and liabilities relating to 11 consolidated entities were $14,565,123 and $14,428,632, respectively. As of December 31, 2017, consolidated FG VIE assets and liabilities relating to 11 consolidated entities were $14,500,507 and $14,366,434, respectively. As of both March 31, 2018 and December 31, 2017, eight and three consolidated FG VIEs related to transactions insured by Ambac UK and Ambac Assurance, respectively. As of March 31, 2018, FG VIE assets and liabilities of $14,247,950 and $14,111,885 and as of December 31, 2017, FG VIE assets and liabilities of $14,160,152 and $14,026,704 related to transactions guaranteed by Ambac UK. The remaining balance of consolidated FG VIE assets and liabilities are related to transactions guaranteed by Ambac Assurance. Ambac is not

| Ambac Financial Group, Inc. 112018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

primarily liable for, and generally does not guarantee all of the debt obligations issued by the VIEs. Ambac would only be required to make payments on the VIE debt obligations in the event that the issuer of such debt obligations defaults on any principal or interest due and such obligation is guaranteed by Ambac. Additionally, Ambac’s general creditors, other than those specific policy holders which own the VIE debt obligations, do not have rights with regard to the assets of the VIEs. Ambac evaluates the net income effects and earnings per share effects to determine attributions between Ambac and non-controlling interests as a result of consolidating a VIE. Ambac has determined that the net income and earnings per share effect of most consolidated FG VIEs are attributable to Ambac’s interests through financial guarantee premium and loss payments with the VIE.

Below is a schedule detailing the change in fair value of the various financial instruments within the consolidated FG VIEs, along with gains (losses) from consolidating and deconsolidating FG VIEs that together comprise Income (loss) on variable interest entities for the affected periods:

	Three Months Ended March 31,
	2018			2017
Income (loss) on changes related to:
Net change in fair value of VIE assets and liabilities	$	1,918		$	3,701
Less: Credit risk changes of fair value liabilities	(1,344		)	—
Consolidation / Deconsolidation	—			—
Income (loss) on Variable Interest Entities	$	574		$	3,701

Effective January 1, 2018, Ambac adopted ASU 2016-01 related to the recognition and measurement of financial liabilities where the fair value option has been elected. As further described in Note 2. Basis of Presentation and Significant Accounting Policies, this guidance requires the portion of the total change in fair value caused by changes in the instrument-specific credit risk to be presented separately in OCI; previously these amounts were recognized in net income. Ambac has elected the fair value option for all consolidated FG VIE liabilities and as such, $1,344 of changes in instrument-specific credit risk for such liabilities was recorded in OCI for the three months ended March 31, 2018.

Ambac consolidated zero and deconsolidated zero VIEs for the three months ended March 31, 2018 and 2017.

The table below provides the fair value of fixed income securities, by asset-type, held by consolidated VIEs as of March 31, 2018 and December 31, 2017:

	March 31, 2018		December 31, 2017
Investments:
Corporate obligations	$	2,955,763	$	2,914,145
Total variable interest entity assets: fixed income securities	$	2,955,763	$	2,914,145

The following table provides supplemental information about the loans held as assets and long-term debt associated with the VIEs for which the fair value option has been elected as of March 31, 2018 and December 31, 2017:

	Estimated Fair Value		Unpaid Principal Balance
March 31, 2018:
Loans	$	11,558,331	$	8,413,664
Long-term debt	12,270,124		9,679,441
December 31, 2017:
Loans	$	11,529,384	$	8,168,651
Long-term debt	12,160,544		9,387,884

Ambac Sponsored VIEs:

A subsidiary of Ambac transferred financial assets to a special purpose entity. The business purpose of this entity was to provide certain financial guarantee clients with funding for their debt obligations. This special purpose entity was established as a separate legal entity, demonstrably distinct from Ambac and that Ambac, its affiliates or its agents could not unilaterally dissolve. The permitted activities of this entity are contractually limited to purchasing assets from Ambac, issuing medium-term notes (“MTNs”) to fund such purchases, executing derivative hedges and obtaining financial guarantee policies with respect to indebtedness incurred. Ambac does not consolidate this entity because Ambac Assurance’s policies issued to this entity were previously allocated to the Segregated Account and, as discussed above, the exercise of related control rights in such policies remain subject to OCI approval under the Stipulation and Order. Ambac elected to account for its equity interest in this entity at fair value under the fair value option in accordance with the Financial Instruments Topic of the ASC. We believe that the fair value of the investments

| Ambac Financial Group, Inc. 122018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

in this entity provides for greater transparency for recording profit or loss as compared to the equity method under the Investments – Equity Method and Joint Ventures Topic of the ASC. Refer to Note 7. Fair Value Measurements for further information on the valuation technique and inputs used to measure the fair value of Ambac’s equity interest in this entity. At March 31, 2018 and December 31, 2017 the fair value of this entity was $5,621 and $5,979, respectively, and is reported within Other assets on the Consolidated Balance Sheets.

• Total principal amount of debt outstanding was $436,080 and $420,600 at March 31, 2018 and December 31, 2017, respectively. In each case, Ambac sold assets to this entity. The assets are composed of utility obligations with a weighted average rating of BBB+ at March 31, 2018 and weighted average life of 2.9 years. The purchase by this entity of financial assets was financed through the issuance of MTNs, which are cross-collateralized by the purchased assets. The MTNs have the same expected weighted average life as the purchased assets. Derivative contracts (interest rate swaps) are used within the entity for economic hedging purposes only. Derivative positions were established at the time MTNs were issued to purchase financial assets. As of March 31, 2018 Ambac Assurance had financial guarantee insurance policies issued for all assets, MTNs and derivative contracts owned and outstanding by the entity.

• Insurance premiums paid to Ambac Assurance by this entity are earned in a manner consistent with other insurance policies, over the risk period. Additionally, any losses incurred on such insurance policies are included in Ambac’s Consolidated Statements of Total Comprehensive Income (Loss). Under the terms of an Administrative Agency Agreement, Ambac provides certain administrative duties, primarily collecting amounts due on the obligations and making interest payments on the MTNs.

In July 2015, Ambac Assurance entered into a secured borrowing transaction whereby it sold 17 Ambac insured residential mortgage-backed securities (the "Securities") and all rights associated therewith as of May 31, 2015, to a Delaware statutory trust (the "Trust") in exchange for an equity certificate in the Trust, all financial guarantee claim payments associated with the Securities and cash of $146,000 (prior to expenses associated with the transaction). Although the Securities were legally sold to the Trust, the Securities remain in Invested assets on the Consolidated Balance Sheets. The Securities had par and fair value of $285,437 and $256,553 as of March 31, 2018, respectively. Refer to Note 8. Investments for further discussion of the restrictions on the invested assets. At the same time, a second Delaware statutory trust (the "Issuer"), issued $146,000 of debt securities and used the proceeds, together with an equity certificate of the Issuer, to purchase from the Trust a certificate secured by and entitling the Issuer to all principal and interest payments (other than financial guarantee claim payments) on the Securities. Interest on the debt securities is payable monthly at an annual rate of one month LIBOR + 2.8%. Both the Trust and the Issuer are consolidated VIEs because Ambac Assurance was involved in their design and holds a significant amount of the beneficial interests issued by the VIEs or guaranteed the assets held by the VIEs. VIE debt outstanding to third parties under this secured borrowing transaction had a carrying value of $65,196 and $73,993 as of March 31, 2018 and December 31, 2017, respectively, and is reported in Long-Term Debt on the Consolidated Balance Sheets.

Variable Interests in Non-Consolidated VIEs

On August 28, 2014, Ambac monetized its ownership of the junior surplus note issued to it by the Segregated Account by depositing the junior surplus note into a newly formed VIE trust in exchange for cash and an owner trust certificate, which represents Ambac's right to residual cash flows from the junior surplus note. Ambac does not consolidate the VIE. Ambac reports this interest in the VIE as an equity investment within Other investments on the Consolidated Balance Sheets with associated results from operations included within Net investment income: Other investments on the Consolidated Statements of Total Comprehensive Income (Loss). The equity investment had a carrying value of $36,209 and $34,941 as of March 31, 2018 and December 31, 2017, respectively.

On February 12, 2018, Ambac formed a special purpose entity, Ambac LSNI, to issue Secured Notes in connection with the Rehabilitation Exit Transactions. Prior to the Rehabilitation Exit Transactions, Ambac and Ambac Assurance owned securities that were insured by Ambac Assurance and allocated to the Segregated Account. As a result of the Rehabilitation Exit Transactions, Ambac Assurance and Ambac received $643,583 and $124,881, respectively, of par amount of secured notes issued by Ambac LSNI. Ambac does not consolidate the VIE and reports its holdings of Secured Notes as Fixed Income Securities in the Consolidated Balance Sheets.

The following table displays the carrying amount of the assets, liabilities and maximum exposure to loss of Ambac’s variable interests in non-consolidated VIEs resulting from financial guarantee and derivative contracts by major underlying asset classes, as of March 31, 2018 and December 31, 2017:

| Ambac Financial Group, Inc. 132018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

	Carrying Value of Assets and Liabilities
	Maximum Exposure To Loss (1)		Insurance Assets (2)		Insurance Liabilities (3)		Net Derivative Assets (Liabilities) (4)
March 31, 2018:
Global structured finance:
Collateralized debt obligations	$	31,644	$	157	$	2	$	(13	)
Mortgage-backed—residential	8,033,584		1,742,097		670,052		—
Other consumer asset-backed	2,209,778		22,416		331,147		—
Other commercial asset-backed	934,919		27,527		30,837		—
Other	2,482,479		57,718		302,232		7,751
Total global structured finance	13,692,404		1,849,915		1,334,270		7,738
Global public finance	25,695,196		345,678		379,521		(1,005		)
Total	$	39,387,600	$	2,195,593	$	1,713,791	$	6,733
December 31, 2017:
Global structured finance:
Collateralized debt obligations	$	35,555	$	169	$	1	$	(15	)
Mortgage-backed—residential	12,766,685		619,848		3,218,356		—
Other consumer asset-backed	2,266,610		23,405		328,732		—
Other commercial asset-backed	987,797		30,413		35,976		—
Other	2,513,304		60,086		306,457		10,311
Total global structured finance	18,569,951		733,921		3,889,522		10,296
Global public finance	25,629,816		335,347		371,056		(551		)
Total	$	44,199,767	$	1,069,268	$	4,260,578	$	9,745

(1) Maximum exposure to loss represents the maximum future payments of principal and interest on insured obligations and derivative contracts plus Deferred Amounts and accrued and unpaid interest thereon. On February 12, 2018, all Deferred Amounts and Interest Accrued on Deferred Amounts were settled in connection with the Rehabilitation Exit Transactions. Ambac’s maximum exposure to loss does not include the benefit of any financial instruments (such as reinsurance or hedge contracts) that Ambac may utilize to mitigate the risks associated with these variable interests.

(2) Insurance assets represent the amount recorded in “Premium receivables” and “Subrogation recoverable” for financial guarantee contracts on Ambac’s Consolidated Balance Sheets.

(3) Insurance liabilities represent the amount recorded in “Loss and loss expense reserves” and “Unearned premiums” for financial guarantee contracts on Ambac’s Consolidated Balance Sheets.

(4) Net derivative assets (liabilities) represent the fair value recognized on credit derivative contracts and interest rate swaps on Ambac’s Consolidated Balance Sheets.

| Ambac Financial Group, Inc. 142018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

4. COMPREHENSIVE INCOME

The following tables detail the changes in the balances of each component of accumulated other comprehensive income for the affected periods:

	Unrealized Gains (Losses) on Available for Sale Securities (1)			Amortization of Postretirement Benefit (1)			Gain (Loss) on Foreign Currency Translation (1)			Credit Risk Changes of Fair Value Option Liabilities (1) (2)			Total
Three Months Ended March 31, 2018:
Beginning Balance	$	30,755		$	10,640		$	(93,634	)	$	—		$	(52,239	)
Adjustment to opening balance, net of taxes (3)	—			—			—			(2,900		)	(2,900		)
Adjusted balance, beginning of period	30,755			10,640			(93,634		)	(2,900		)	(55,139		)
Other comprehensive income (loss) before reclassifications	125,159			(556		)	32,056			—			156,659
Amounts reclassified from accumulated other comprehensive income (loss)	(2,855		)	(303		)	—			1,114			(2,044		)
Net current period other comprehensive income (loss)	122,304			(859		)	32,056			1,114			154,615
Balance at March 31, 2018	$	153,059		$	9,781		$	(61,578	)	$	(1,786	)	$	99,476
Three Months Ended March 31, 2017:
Beginning Balance	$	118,863		$	9,367		$	(167,220	)	$	—		$	(38,990	)
Other comprehensive income (loss) before reclassifications	12,500			2,625			12,593			—			27,718
Amounts reclassified from accumulated other comprehensive income (loss)	8,835			(338		)	—			—			8,497
Net current period other comprehensive income (loss)	21,335			2,287			12,593			—			36,215
Balance at March 31, 2017	$	140,198		$	11,654		$	(154,627	)	$	—		$	(2,775	)

(1) All amounts are net of tax and noncontrolling interest. Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income.

(2) Represents the changes in fair value attributable to instrument-specific credit risk of liabilities for which the fair value option is elected.

(3) Beginning in 2018, Credit risk changes of fair value option liabilities are reflected as a component of Accumulated Other Comprehensive Income pursuant to the adoption of ASU 2016-01. See Note 2 to the Consolidated Financial Statements included in this Form 10-Q for further information regarding this change.

The following table details the significant amounts reclassified from each component of accumulated other comprehensive income, shown in the above rollforward tables, for the affected periods:

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income (1)						Affected Line Item in the Consolidated Statement of Total Comprehensive Income (Loss)
	Three Months Ended March 31,
	2018			2017
Unrealized Gains (Losses) on Available-for-Sale Securities
	$	(4,563	)	$	8,835		Net realized investment gains (losses) and other-than-temporary impairment losses
	1,708			—			Provision for income taxes
	$	(2,855	)	$	8,835		Net of tax and noncontrolling interest
Amortization of Postretirement Benefit
Prior service cost	$	(241	)	$	(241	)	Other income (2)
Actuarial (losses)	(62		)	(97		)	Other income (2)
	(303		)	(338		)	Total before tax
	—			—			Provision for income taxes
	(303		)	(338		)	Net of tax and noncontrolling interest
Credit risk changes of fair value option liabilities
	$	1,344		$	—		Credit Risk Changes of Fair Value Option Liabilities
	(230		)	—			Provision for income taxes
	$	1,114		$	—		Net of tax and noncontrolling interest
Total reclassifications for the period	$	(2,044	)	$	8,497		Net of tax and noncontrolling interest

| Ambac Financial Group, Inc. 152018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

(1) Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income with corresponding increases to the affected line items in the Consolidated Statement of Total Comprehensive Income.

(2) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost.

5. NET INCOME PER SHARE

On May 1, 2013, pursuant to the Second Modified Fifth Amended Plan of Reorganization of Ambac (the "Reorganization Plan"), 45,000,000 shares of new common stock at par value of $0.01 per share and 5,047,138 of warrants were issued. Warrants entitled such holders to acquire up to 5,047,138 shares of new common stock at an exercise price of $16.67 per share at any time on or prior to April 30, 2023. For the three months ended March 31, 2018 and 2017, 194 and 0 warrants were exercised, respectively, resulting in an issuance of 194 and 0 shares of common stock, respectively.

On June 30, 2015, the Board of Directors of Ambac authorized the establishment of a warrant repurchase program that permits the repurchase of up to $10,000 of warrants. On November 3, 2016, the Board of Directors of Ambac authorized a $10,000 increase to the warrant repurchase program. For the three months ended March 31, 2018, Ambac repurchased 0 warrants at a cost of $0. As of March 31, 2018, Ambac has repurchased 985,331 warrants totaling $8,092, (average cost of $8.21 per warrant) leaving 4,053,476 warrants outstanding. The remaining aggregate authorization at March 31, 2018 is $11,939.

Basic net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding and vested restricted stock units. Diluted net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares used for basic earnings per share plus all potential dilutive common shares outstanding during the period. All potential dilutive common shares outstanding consider common stock deliverable pursuant to warrants issued under the Reorganization Plan, vested and unvested options, unvested restricted stock units and performance stock units granted under employee and director compensation plans.

The following table provides a reconciliation of the common shares used for basic net income per share to the diluted shares used for diluted net income per share:

	Three Months Ended March 31,
	2018	2017
Basic weighted average shares outstanding	45,471,083	45,292,253
Effect of potential dilutive shares (1):
Warrants	—	—
Restricted stock units	45,713	—
Performance stock units	136,675	—
Diluted weighted average shares outstanding	45,653,471	45,292,253
Anti-dilutive shares excluded from the above reconciliation:
Stock options	126,667	126,667
Warrants	4,053,476	4,053,670
Restricted stock units	—	94,204
Performance stock units (2)	—	342,456

(1) For the three months ended March 31, 2017, Ambac had a net loss and accordingly excluded all potentially dilutive securities from the determination of diluted loss per share as their impact was anti-dilutive.

(2) Performance stock units are reflected herein at their target issuance amounts. Vesting of these units is contingent upon meeting certain performance metrics. Although a portion of these performance metrics have been achieved as of the respective period end, it is possible that awards may no longer meet the metric at the end of the performance period.

6. FINANCIAL GUARANTEE INSURANCE CONTRACTS

Amounts presented in this Note relate only to Ambac’s non-derivative insurance business for insurance policies issued to beneficiaries, including VIEs, for which we do not consolidate the VIE.

Net Premiums Earned:

Gross premiums are received either upfront or in installments. For premiums received upfront, an unearned premium revenue (“UPR”) liability is established, which is initially recorded as the cash amount received. For installment premium transactions, a premium receivable asset and offsetting UPR liability is initially established in an amount equal to: (i) the present value of future contractual premiums due (the “contractual” method) or (ii) if the assets underlying the insured obligation are homogenous pools which are contractually prepayable, the present value of premiums to be collected over the expected life of the transaction (the “expected” method). An appropriate risk-free rate corresponding to the weighted average life of each policy and currency is used to discount the future premiums contractually due or expected to be collected. For

| Ambac Financial Group, Inc. 162018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

example, U.S. dollar exposures are discounted using U.S. Treasury rates while exposures denominated in a foreign currency are discounted using the appropriate risk-free rate for the respective currency. The weighted average risk-free rate at March 31, 2018 and December 31, 2017, was 2.7% and 2.5%, respectively, and the weighted average period of future premiums used to estimate the premium receivable at March 31, 2018 and December 31, 2017, was 8.9 years and 9.8 years, respectively.

Insured obligations consisting of homogeneous pools for which Ambac uses expected future premiums to estimate the premium receivable and UPR include residential mortgage-backed securities. As prepayment assumptions change for homogenous pool transactions, or if there is an actual prepayment for a “contractual” method installment transaction, the related premium receivable and UPR are adjusted in equal and offsetting amounts with no immediate effect on earnings using new premium cash flows and the then current risk-free rate.

In evaluating the credit quality of the premium receivables, management evaluates the obligor's ability to pay. For structured finance transactions, this evaluation will include a review of the priority for the payment of financial guarantee premiums to Ambac, as required by bond indentures, in the transaction's waterfall structure. The financial guarantee premium is generally senior in the waterfall. Uncollectable premiums are determined on a policy basis and utilize a combination of historical premium collection data in addition to cash flow analysis to determine if an impairment in the related policy's premium receivables exist. At March 31, 2018 and December 31, 2017, $8,738 and $9,331 respectively, of premium receivables were deemed uncollectable. As of March 31, 2018 and December 31, 2017, approximately 21% and 22% of the premium receivables, net of uncollectable receivables, related to transactions with non-investment grade internal ratings, mainly of structured finance transactions, which comprised 14% and 16% of the total premium receivables at March 31, 2018 and December 31, 2017, respectively. Past due premiums on policies insuring non-investment grade obligations amounted to less than $500 at March 31, 2018.

Below is the gross premium receivable roll-forward for the affected periods:

	Three Months Ended March 31,
	2018			2017
Beginning premium receivable	$	586,312		$	661,337
Premium receipts	(15,381		)	(17,978		)
Adjustments for changes in expected and contractual cash flows	(1,289		)	1,352
Accretion of premium receivable discount	3,846			4,244
Changes to uncollectable premiums	604			(12		)
Other adjustments (including foreign exchange)	6,615			3,734
Ending premium receivable (1)	$	580,707		$	652,677

(1) Gross premium receivable includes premiums to be received in foreign denominated currencies most notably in British Pounds and Euros. At March 31, 2018 and 2017, premium receivables include British Pounds of $163,926 (£116,815) and $185,204 (£147,726), respectively, and Euros of $36,679 (€29,767) and $34,908 (€32,671), respectively.

Similar to gross premiums, premiums ceded to reinsurers are paid either upfront or in installments. Premiums ceded to reinsurers reduce the amount of premiums earned by Ambac from its financial guarantee insurance policies.

When a bond issue insured by Ambac Assurance has been retired early, typically due to an issuer call, any remaining UPR is recognized at that time to the extent the financial guarantee contract is legally extinguished, causing accelerated premium revenue. For installment premium paying transactions, we offset the recognition of any remaining UPR by the reduction of the related premium receivable to zero (as it will not be collected as a result of the retirement), which may cause negative accelerated premium revenue. Ambac’s accelerated premium revenue for retired obligations for the three months ended March 31, 2018 and 2017 was $9,392 and $16,280, respectively. Certain obligations insured by Ambac have been legally defeased whereby government securities are purchased by the issuer with the proceeds of a new bond issuance, or less frequently with other funds of the issuer, and held in escrow. The principal and interest received from the escrowed securities are then used to retire the Ambac-insured obligations at a future date either to their maturity date (a refunding) or a specified call date (a pre-refunding). Ambac has evaluated the provisions in policies issued on these obligations and determined those insurance policies have not been legally extinguished. For policies with refunding securities, premium revenue recognition is not impacted as the escrowed maturity date is the same as the previous legal maturity date. For policies with pre-refunding securities, the maturity date of the pre-refunded security has been shortened from its previous legal maturity. Although premium revenue recognition has not been accelerated in the period of the pre-refunding, it results in an increase in the rate at which the policy's remaining UPR is to be recognized.

| Ambac Financial Group, Inc. 172018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

The effect of reinsurance on premiums written and earned for the respective periods was as follows:

	Three Months Ended March 31,
	2018					2017
	Written			Earned		Written			Earned
Direct	$	4,261		$	32,609	$	5,584		$	52,065
Assumed	—			19		—			21
Ceded	(819		)	1,745		(1,815		)	4,473
Net premiums	$	5,080		$	30,883	$	7,399		$	47,613

The following table summarizes net premiums earned by location of risk for the respective periods:

	Three Months Ended March 31,
	2018		2017
United States	$	24,718	$	40,621
United Kingdom	4,856		5,263
Other international	1,309		1,729
Total	$	30,883	$	47,613

The table below summarizes the future gross undiscounted premiums to be collected and future premiums earned, net of reinsurance at March 31, 2018:

	Future Premiums to be Collected (1)		Future Premiums to be Earned Net of Reinsurance (1)
Three months ended:
June 30, 2018	$	14,957	$	17,037
September 30, 2018	14,771		16,388
December 31, 2018	12,947		15,946
Twelve months ended:
December 31, 2019	55,142		60,697
December 31, 2020	52,344		56,759
December 31, 2021	45,913		51,792
December 31, 2022	43,923		48,292
Five years ended:
December 31, 2027	195,614		196,972
December 31, 2032	153,584		132,598
December 31, 2037	85,689		73,307
December 31, 2042	31,028		25,070
December 31, 2047	14,425		12,798
December 31, 2052	3,620		4,656
December 31, 2057	92		297
Total	$	724,049	$	712,609

(1) Future premiums to be collected are undiscounted and are used to derive the discounted premium receivable asset recorded on Ambac's balance sheet. Future premiums to be earned, net of reinsurance relate to the unearned premiums liability and deferred ceded premium asset recorded on Ambac’s balance sheet. The use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral is required in the calculation of the premium receivable, as further described in Note 2. Basis of Presentation and Significant Accounting Policies in the Notes to Consolidated Financial Statements included in Ambac's Annual Report on Form 10-K for the year ended December 31, 2017. This results in a different premium receivable balance than if expected lives were considered. If installment paying policies are retired or prepay early, premiums reflected in the premium receivable asset and amounts reported in the above table for such policies may not be collected. Future premiums to be earned also considers the use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral, which may result in different unearned premium than if expected lives were considered. If those bonds types are retired early, premium earnings may be negative in the period of call or refinancing.

| Ambac Financial Group, Inc. 182018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Loss and Loss Expense Reserves:

The loss and loss expense reserve (“loss reserve”) policy for financial guarantee insurance relates only to Ambac’s non-derivative insurance business for insurance policies issued to beneficiaries, including VIEs, for which we do not consolidate the VIE. Losses and loss expenses are based upon estimates of the ultimate aggregate losses inherent in the non-derivative financial guarantee portfolio as of the reporting date. A loss reserve is recorded on the balance sheet on a policy-by-policy basis. Loss reserve components of an insurance policy include unpaid claims and the present value ("PV") of expected net cash flows required to be paid under an insurance contract, further described below:

• Unpaid claims represent the sum of (i) claims presented and not yet paid for policies allocated to the Segregated Account, including Deferred Amounts and (ii) accrued interest on Deferred Amounts as required by the amended Segregated Account Rehabilitation Plan that became effective on June 12, 2014. As a result of the Rehabilitation Exit Transactions, as of February 12, 2018, all unpaid claims for policies allocated to the Segregated Account were fully satisfied and discharged.

• The PV of expected net cash flows represents the PV of expected cash outflows less the PV of expected cash inflows. The PV of expected net cash flows are impacted by: (i) expected future claims to be paid under an insurance contract, including the impact of potential settlement outcomes upon future installment premiums, (ii) expected recoveries from contractual breaches of RMBS representations and warranties ("R&W") by transaction sponsors, (iii) excess spread within the underlying transaction's cash flow structure, and (iv) other subrogation recoveries, including expected receipts from third parties within the underlying transaction's cash flow structure. Ambac’s approach to resolving disputes involving contractual breaches by transaction sponsors or other third parties has included negotiations and/or pursuing litigation. Ambac does not include potential recoveries attributed solely to fraudulent inducement claims in our estimate of subrogation recoveries, since any remedies under such claims would be non-contractual.

Net cash outflow policies represent contracts where the sum of unpaid claims plus the PV of expected cash outflows are greater than the PV of expected cash inflows. For such policies, a “Loss and loss expense reserves” liability is recorded for the sum of: (i) unpaid claims plus (ii) the excess of the PV of expected net cash outflows over the unearned premium revenue. Net cash inflow policies represent contracts where losses have been paid, but not yet recovered, such that the PV of expected cash inflows are greater than the sum of unpaid claims plus the PV of expected cash outflows. For such policies, a “Subrogation recoverable” asset is recorded for the difference between (i) the PV of expected net cash inflows and (ii) unpaid claims.

The approaches used to estimate expected future claims and expected future recoveries considers the likelihood of all possible outcomes. The evaluation process for determining expected losses is subject to material estimates and judgments based on our assumptions regarding the probability of default by the issuer of the insured security, probability of settlement outcomes (which may include commutation settlements, refinancing and/or other settlements), expected severity of credits for each insurance contract and the timing of expected events including default, commutation and recovery. Ambac’s loss reserves are based on management’s on-going review of the financial guarantee credit portfolio. Below are the components of the Loss and loss expense reserves liability and the Subrogation recoverable asset at March 31, 2018 and December 31, 2017:

	Unpaid Claims				Present Value of Expected Net Cash Flows
Balance Sheet Line Item	Claims		Accrued Interest		Claims and Loss Expenses		Recoveries			Unearned Premium Revenue			Gross Loss and Loss Expense Reserves
March 31, 2018:
Loss and loss expense reserves	$	—	$	—	$	2,592,778	$	(324,936	)	$	(128,741	)	$	2,139,101
Subrogation recoverable	—		—		275,425		(2,170,203		)	—			(1,894,778		)
Totals	$	—	$	—	$	2,868,203	$	(2,495,139	)	$	(128,741	)	$	244,323
December 31, 2017:
Loss and loss expense reserves	$	2,411,632	$	667,988	$	2,855,010	$	(1,054,113	)	$	(135,502	)	$	4,745,015
Subrogation recoverable	615,391		171,755		102,171		(1,520,530		)	—			(631,213		)
Totals	$	3,027,023	$	839,743	$	2,957,181	$	(2,574,643	)	$	(135,502	)	$	4,113,802

| Ambac Financial Group, Inc. 192018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Below is the loss and loss expense reserve roll-forward, net of subrogation recoverable and reinsurance, for the affected periods:

	Three Months Ended March 31,
	2018			2017
Beginning gross loss and loss expense reserves	$	4,113,802		$	3,696,038
Reinsurance recoverable	40,658			30,767
Beginning balance of net loss and loss expense reserves	4,073,144			3,665,271
Losses and loss expenses (benefit):
Current year	778			1,543
Prior year	(248,173		)	133,468
Total (1) (2) (3)	(247,395		)	135,011
Loss and loss expenses (recovered) paid:
Current year	—			696
Prior year (3)	3,631,177			9,749
Total	3,631,177			10,445
Foreign exchange effect	11,016			5,827
Ending net loss and loss expense reserves	205,588			3,795,664
Reinsurance recoverable (4)	38,735			34,691
Ending gross loss and loss expense reserves (5)	$	244,323		$	3,830,355

(1) Total losses and loss expenses (benefit) includes $1,354 and $(4,112) for the three months ended March 31, 2018 and 2017, respectively, related to ceded reinsurance.

(2) Ambac records the impact of estimated recoveries related to securitized loans in RMBS transactions that breached certain R&Ws within losses and loss expenses (benefit). The losses and loss expense (benefit) incurred associated with changes in estimated representation and warranties for the three months ended March 31, 2018 and 2017 was $800 and $13,797, respectively.

(3) On February 12, 2018, Deferred Amounts and Interest Accrued on Deferred Amounts in the amount of $3,000,158 and $856,834, respectively were settled in connection with the Rehabilitation Exit Transactions. 2018 includes a $288,204 loss and loss expense benefit on these settled Deferred Amounts.

(4) Represents reinsurance recoverable on future loss and loss expenses. Additionally, the Balance Sheet line "Reinsurance recoverable on paid and unpaid losses" includes reinsurance recoverables (payables) of $90 and $(418) as of March 31, 2018 and 2017, respectively, related to previously presented loss and loss expenses and subrogation.

(5) Includes Euro denominated gross loss and loss expense reserves of $21,398 (€17,366) and $20,984 (€19,639) at March 31, 2018 and 2017, respectively.

For 2018, the net positive development in prior years was primarily a result of the discount recorded on the Rehabilitation Exit Transactions partially offset by negative development in the RMBS portfolio and interest accrued on Deferred Amounts prior to the Rehabilitation Exit Transactions.

For 2017, the net adverse development in prior years was primarily driven by certain public finance transactions, primarily Puerto Rico, and interest accrued on Deferred Amounts partially offset by positive development in certain Ambac UK transactions, primarily Ballantyne. OnMarch 25, 2017, Ambac UK agreed in principle to a confidential settlement of litigation brought by Ambac UK in the name of Ballantyne against J.P. Morgan Investment Management Inc. ("JPMIM") relating to the management of Ballantyne’s investment accounts, which were funded with the proceeds of notes issued in 2006 in connection with a structured reinsurance transaction and guaranteed in part by Ambac UK. On April 11, 2017, Ambac UK, Ballantyne and JPMIM signed a settlement agreement. Pursuant to the settlement, Ballantyne received a payment of $325,600 from JPMIM in return for releases of all claims by Ballantyne and Ambac UK. As a result of the settlement, Ambac recognized an incremental benefit through a reduction in losses and loss expenses of approximately $91,600 in the first quarter of 2017. The total benefit recognized from the settlement of the litigation will reduce the ultimate Ballantyne claims Ambac UK is expecting to pay and did not result in a direct cash payment to Ambac UK.

| Ambac Financial Group, Inc. 202018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

The tables below summarize information related to policies currently included in Ambac’s loss and loss expense reserves or subrogation recoverable at March 31, 2018 and December 31, 2017. Gross par exposures include capital appreciation bonds which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bond. The weighted average risk-free rate used to discount loss reserves at March 31, 2018 and December 31, 2017 was 2.8% and 2.5%, respectively.

Surveillance Categories as of March 31, 2018
	I			IA			II			III			IV			V			Total
Number of policies	25			26			15			23			157			4			250
Remaining weighted-average contract period (in years) (1)	10			22			10			23			12			4			16
Gross insured contractual payments outstanding:
Principal	$	967,427		$	576,858		$	642,281		$	2,013,845		$	6,350,960		$	48,562		$	10,599,933
Interest	500,680			601,901			243,259			7,195,260			2,359,913			16,332			10,917,345
Total	$	1,468,107		$	1,178,759		$	885,540		$	9,209,105		$	8,710,873		$	64,894		$	21,517,278
Gross undiscounted claim liability	$	4,264		$	56,682		$	59,584		$	1,449,879		$	2,543,988		$	64,861		$	4,179,258
Discount, gross claim liability	(514		)	(13,866		)	(9,724		)	(693,598		)	(675,210		)	(5,113		)	(1,398,025		)
Gross claim liability before all subrogation and before reinsurance	3,750			42,816			49,860			756,281			1,868,778			59,748			2,781,233
Less:
Gross RMBS subrogation (2)	—			—			—			—			(1,861,894		)	—			(1,861,894		)
Discount, RMBS subrogation	—			—			—			—			28,384			—			28,384
Discounted RMBS subrogation, before reinsurance	—			—			—			—			(1,833,510		)	—			(1,833,510		)
Less:
Gross other subrogation (3)	—			(8,604		)	(4		)	(53,703		)	(675,089		)	(13,138		)	(750,538		)
Discount, other subrogation	—			5,810			—			9,497			69,630			3,972			88,909
Discounted other subrogation, before reinsurance	—			(2,794		)	(4		)	(44,206		)	(605,459		)	(9,166		)	(661,629		)
Gross claim liability, net of all subrogation and discounts, before reinsurance	3,750			40,022			49,856			712,075			(570,191		)	50,582			286,094
Less: Unearned premium revenue	(1,586		)	(10,092		)	(9,810		)	(44,754		)	(62,241		)	(258		)	(128,741		)
Plus: Loss expense reserves	16,141			3,082			582			11,146			56,019			—			86,970
Gross loss and loss expense reserves	$	18,305		$	33,012		$	40,628		$	678,467		$	(576,413	)	$	50,324		$	244,323
Reinsurance recoverable reported on Balance Sheet (4)	$	238		$	4,448		$	8,368		$	38,603		$	(12,832	)	$	—		$	38,825

(1) Remaining weighted-average contract period is weighted based on projected gross claims over the lives of the respective policies.

(2) RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for representation and warranty ("R&W") breaches.

(3) Other subrogation represents subrogation related to excess spread and other contractual cash flows on public finance and structured finance transactions, including RMBS.

(4) Reinsurance recoverable reported on the Balance Sheet includes reinsurance recoverables of $38,735 related to future loss and loss expenses and $90 related to presented loss and loss expenses and subrogation.

| Ambac Financial Group, Inc. 212018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Surveillance Categories as of December 31, 2017
	I			IA			II			III			IV			V			Total
Number of policies	26			20			26			22			179			4			277
Remaining weighted-average contract period (in years) (1)	10			23			10			24			13			4			17
Gross insured contractual payments outstanding:
Principal	$	1,046,267		$	531,190		$	1,199,909		$	1,998,861		$	6,862,281		$	48,562		$	11,687,070
Interest	531,657			584,098			413,045			7,182,715			2,469,765			16,332			11,197,612
Total	$	1,577,924		$	1,115,288		$	1,612,954		$	9,181,576		$	9,332,046		$	64,894		$	22,884,682
Gross undiscounted claim liability (2)	$	4,434		$	56,659		$	77,289		$	1,412,976		$	6,409,340		$	64,863		$	8,025,561
Discount, gross claim liability	(465		)	(13,095		)	(12,250		)	(643,897		)	(616,559		)	(4,739		)	(1,291,005		)
Gross claim liability before all subrogation and before reinsurance	3,969			43,564			65,039			769,079			5,792,781			60,124			6,734,556
Less:
Gross RMBS subrogation (3)	—			—			—			—			(1,857,502		)	—			(1,857,502		)
Discount, RMBS subrogation	—			—			—			—			23,115			—			23,115
Discounted RMBS subrogation, before reinsurance	—			—			—			—			(1,834,387		)	—			(1,834,387		)
Less:
Gross other subrogation (4)	—			(7,990		)	(9,371		)	(53,070		)	(743,456		)	(13,191		)	(827,078		)
Discount, other subrogation	—			5,169			2,550			8,349			67,045			3,709			86,822
Discounted other subrogation, before reinsurance	—			(2,821		)	(6,821		)	(44,721		)	(676,411		)	(9,482		)	(740,256		)
Gross claim liability, net of all subrogation and discounts, before reinsurance	3,969			40,743			58,218			724,358			3,281,983			50,642			4,159,913
Less: Unearned premium revenue	(2,126		)	(9,990		)	(12,238		)	(46,086		)	(64,786		)	(276		)	(135,502		)
Plus: Loss expense reserves	16,116			3,242			665			13,331			56,037			—			89,391
Gross loss and loss expense reserves	$	17,959		$	33,995		$	46,645		$	691,603		$	3,273,234		$	50,366		$	4,113,802
Reinsurance recoverable reported on Balance Sheet (5)	$	202		$	4,894		$	9,424		$	38,465		$	(11,988	)	$	—		$	40,997

(1) Remaining weighted-average contract period is weighted based on projected gross claims over the lives of the respective policies.

(2) Gross undiscounted claim liability includes unpaid claims, including accrued interest on Deferred Amounts, on policies allocated to the Segregated Account and Ambac's estimate of expected future claims.

(3) RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for R&W breaches.

(4) Other subrogation represents subrogation related to excess spread and other contractual cash flows on public finance and structured finance transactions, including RMBS.

(5) Reinsurance recoverable reported on Balance Sheet includes reinsurance recoverables of $40,658 related to future loss and loss expenses and $339 related to presented loss and loss expenses and subrogation.

Puerto Rico:

Ambac has exposure to the Commonwealth of Puerto Rico (the "Commonwealth") and its instrumentalities across several different issuing entities. Each has its own credit risk profile attributable to discrete revenue sources, direct general obligation pledges and general obligation guarantees. The Commonwealth of Puerto Rico and certain of its instrumentalities have and will continue to default on debt service payments, including payments owed on bonds insured by Ambac Assurance. Ambac Assurance may be required to make significant amounts of policy payments over the next several years, the recoverability of which is subject to great uncertainty, which may lead to material permanent losses. Our exposure to Puerto Rico is impacted by the amount of monies available for debt service, which is in turn affected by variability in economic growth, tax revenues, essential services expense as well as federal funding of Commonwealth needs. In addition, our exposure to Puerto Rico is impacted by the significant damage to the Commonwealth that was inflicted by Hurricane Maria, which made landfall on September 20, 2017, as well as Hurricane Irma, which passed just north of the island on September 6, 2017. The longer term recovery of the economy of the Commonwealth and its essential infrastructure will likely be highly dependent on, amongst other factors, the amount, timing and effectiveness of Federal aid.

Substantial uncertainty also exists with respect to the ultimate outcome for creditors in Puerto Rico due to legislation enacted by the Commonwealth and the United States, including PROMESA, as well as actions taken in reliance on such laws, including Title III filings. Ambac Assurance is

| Ambac Financial Group, Inc. 222018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

involved in multiple litigations relating to such actions and other issues and may not be successful in pursuing claims or protecting its interests. Ambac Assurance is also participating in a mediation process with respect to potential debt restructurings. Mediation may not be productive or may not resolve Ambac Assurance's claims in a manner that avoids significant losses. It is possible that certain restructuring process solutions, together with associated legislation, budgetary, and/or public policy proposals could be adopted and could significantly or further impair our exposures.

While our reserving scenarios reflect a wide range of possible outcomes reflecting the significant uncertainty regarding future developments and outcomes, given our exposure to Puerto Rico and the economic, fiscal, legal and political uncertainties associated therewith as well as the uncertainties emanating from the damage caused by hurricanes Maria and Irma, our loss reserves may ultimately prove to be insufficient to cover our losses, potentially by a material amount, and may be subject to material volatility.

Ambac has considered these developments and other factors in evaluating its Puerto Rico loss reserves. During the three months ended March 31, 2018, Ambac had an incurred benefit associated with its Domestic Public Finance insured portfolio of $11,273, which was significantly impacted by an increase in loss reserve discount rates, partially offset by the continued uncertainty and volatility of the situation in Puerto Rico. While management believes its reserves are adequate to cover losses in its Public Finance insured portfolio, there can be no assurance that Ambac may not incur additional losses in the future, particularly given the developing economic, political, and legal circumstances in Puerto Rico. Such additional losses may have a material adverse effect on Ambac’s results of operations and financial condition. For public finance credits, including Puerto Rico, as well as other issuers, for which Ambac has an estimate of expected loss at March 31, 2018, the possible increase in loss reserves under stress or other adverse conditions and circumstances was estimated to be approximately $1,340,000. However, there can be no assurance that losses may not exceed such amount.

Representation and Warranty Recoveries:

Ambac records estimated subrogation recoveries for breaches of R&Ws by sponsors of certain RMBS transactions. For a discussion of the approach utilized to estimate R&W subrogation recoveries, see Note 2. Basis of Presentation and Significant Accounting Policiesin the Notes to Consolidated Financial Statements included Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. R&W subrogation may include estimates of potential sponsor settlements which have not been subject to a sampling approach. However, such estimates are not material to Ambac’s financial results and therefore are included in the below table.

Ambac has recorded R&W subrogation recoveries of $1,833,510 ($1,805,936 net of reinsurance) and $1,834,387 ($1,806,736 net of reinsurance) at March 31, 2018 and December 31, 2017, respectively. The balance of R&W subrogation recoveries and the related loss reserves at March 31, 2018 and December 31, 2017, are as follows:

	Gross Loss Reserves Before Subrogation Recoveries (1)		Subrogation Recoveries (2)(3)			Gross Loss Reserves After Subrogation Recoveries
At March 31, 2018	$	171,999	$	(1,833,510	)	$	(1,661,511	)
At December 31, 2017	$	1,366,483	$	(1,834,387	)	$	(467,904	)

(1) Amount represents gross loss reserves for policies that have established a representation and warranty subrogation recovery.December 31, 2017 includes unpaid RMBS claims (including accrued interest on Deferred Amounts) on policies allocated to the Segregated Account, such balances have been settled via the Rehabilitation Exit Transactions.

(2) The amount of recorded subrogation recoveries related to each securitization is limited to ever-to-date paid and unpaid losses plus the present value of expected future cash flows for each policy. To the extent losses have been paid but not yet fully recovered, the recorded amount of R&W subrogation recoveries may exceed the sum of the unpaid claims and the present value of expected cash out flows for a given policy. The net cash inflow for these policies is recorded as a “Subrogation recoverable” asset. For those transactions where the subrogation recovery is less than the sum of unpaid claims and the present value of expected cash flows, the net cash outflow for these policies is recorded as a “Loss and loss expense reserves” liability.

(3) The sponsor’s repurchase obligation may differ depending on the terms of the particular transaction and the status of the specific loan, such as whether it is performing or has been liquidated or charged off.

Below is the rollforward of R&W subrogation for the affected periods:

	Three Months Ended March 31,
	2018			2017
Discounted R&W subrogation (gross of reinsurance) at beginning of period	$	1,834,387		$	1,907,035
Changes recognized during the period:
All other changes (1)	(877		)	(14,061		)
Discounted R&W subrogation (gross of reinsurance) at end of period	$	1,833,510		$	1,892,974

| Ambac Financial Group, Inc. 232018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

(1) All other changes which may impact R&W subrogation recoveries include changes in actual or projected collateral performance, changes in the creditworthiness of a sponsor and/or the projected timing of recoveries. All other changes may also include estimates of potential sponsor settlements that may not have been subject to a sampling approach. Those that have not been subject to a sampling approach are not material to Ambac’s financial results and therefore are included in this table.

Our ability to realize R&W subrogation recoveries is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties (and/or their respective parents and affiliates), timing of receipt of any such recoveries, intervention by OCI, which could impede our ability to take actions required to realize such recoveries, and uncertainty inherent in the assumptions used in estimating such recoveries.

Insurance intangible asset:

The insurance intangible amortization expense is included in insurance intangible amortization on the Consolidated Statements of Total Comprehensive Income (Loss). For the three months ended March 31, 2018 and 2017, the insurance intangible amortization expense was $28,636 and $37,525, respectively. As of March 31, 2018 and December 31, 2017, the gross carrying value of the insurance intangible asset was $1,601,066 and $1,581,156, respectively. Accumulated amortization of the insurance intangible asset was $768,026 and $734,183, as of March 31, 2018 and December 31, 2017, respectively, resulting in a net insurance intangible asset of $833,040 and $846,973, respectively.

The estimated future amortization expense for the net insurance intangible asset is as follows:

	2018		2019		2020		2021		2022		Thereafter
Amortization expense (1)	$	55,687	$	68,517	$	63,475	$	57,891	$	53,816	$	533,654

(1) Future amortization considers the use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay certain obligations. If those bonds types are retired early, amortization expense may differ in the period of call or refinancing.

7. FAIR VALUE MEASUREMENTS

The Fair Value Measurement Topic of the ASC establishes a framework for measuring fair value and disclosures about fair value measurements.

Fair Value Hierarchy:

The Fair Value Measurement Topic of the ASC specifies a fair value hierarchy based on whether the inputs to valuation techniques used to measure fair value are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect Company-based assumptions. The fair value hierarchy prioritizes model inputs into three broad levels as follows:

l	Level 1	Quoted prices for identical instruments in active markets. Assets and liabilities classified as Level 1 include US Treasury and other foreign government obligations traded in highly liquid and transparent markets, exchange traded futures contracts, variable rate demand obligations and money market funds.
l	Level 2	Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets. Assets and liabilities classified as Level 2 generally include investments in fixed income securities representing municipal, asset-backed and corporate obligations, certain interest rate swap contracts and most long-term debt of variable interest entities consolidated under the Consolidation Topic of the ASC.
l	Level 3	Model derived valuations in which one or more significant inputs or significant value drivers are unobservable. This hierarchy requires the use of observable market data when available. Assets and liabilities classified as Level 3 include credit derivative contracts, certain uncollateralized interest rate swap contracts, equity interests in Ambac sponsored special purpose entities and certain investments in fixed income securities. Additionally, Level 3 assets and liabilities generally include loan receivables, and certain long-term debt of variable interest entities consolidated under the Consolidation Topic of the ASC.

The following table sets forth the carrying amount and fair value of Ambac’s financial assets and liabilities as of March 31, 2018 and December 31, 2017, including the level within the fair value hierarchy at which fair value measurements are categorized. As required by the Fair Value Measurement Topic of the ASC, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

| Ambac Financial Group, Inc. 242018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

	Carrying Amount			Total Fair Value			Fair Value Measurements Categorized as:
March 31, 2018:							Level 1		Level 2			Level 3
Financial assets:
Fixed income securities:
Municipal obligations	$	855,387		$	855,387		$	—	$	855,387		$	—
Corporate obligations	1,438,993			1,438,993			450		1,438,543			—
Foreign obligations	26,395			26,395			25,492		903			—
U.S. government obligations	87,261			87,261			87,261		—			—
Residential mortgage-backed securities	823,296			823,296			—		817,987			5,309
Collateralized debt obligations	50,958			50,958			—		50,958			—
Other asset-backed securities	589,648			589,648			—		517,327			72,321
Fixed income securities, pledged as collateral:
U.S. government obligations	84,240			84,240			84,240		—			—
Short term investments	321,119			321,119			269,171		51,948			—
Other investments (1)	419,896			402,072			57,535		—			18,385
Cash and cash equivalents	38,485			38,485			35,033		3,452			—
Loans	10,643			12,042			—		—			12,042
Derivative assets:
Interest rate swaps—asset position	60,198			60,198			—		9,272			50,926
Interest rate swaps—liability position	(2		)	(2		)	—		(2		)	—
Other assets	5,621			5,621			—		—			5,621
Variable interest entity assets:
Fixed income securities:
Corporate obligations	2,955,763			2,955,763			—		—			2,955,763
Restricted cash	1,134			1,134			1,134		—			—
Loans	11,558,331			11,558,331			—		—			11,558,331
Derivative assets:
Currency swaps-asset position	46,260			46,260			—		46,260			—
Total financial assets	$	19,289,386		$	19,272,961		$	476,076	$	3,792,035		$	14,678,698
Financial liabilities:
Long term debt, including accrued interest	$	3,201,931		$	3,265,029		$	—	$	2,651,952		$	613,077
Derivative liabilities:
Credit derivatives	1,018			1,018			—		—			1,018
Interest rate swaps—liability position	70,566			70,566			—		70,566			—
Liabilities for net financial guarantees written (2)	(432,722		)	900,880			—		—			900,880
Variable interest entity liabilities:
Long-term debt	12,270,124			12,270,124			—		9,573,607			2,696,517
Derivative liabilities:
Interest rate swaps—liability position	2,155,456			2,155,456			—		2,155,456			—
Total financial liabilities	$	17,266,373		$	18,663,073		$	—	$	14,451,581		$	4,211,492

| Ambac Financial Group, Inc. 252018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

	Carrying Amount			Total Fair Value			Fair Value Measurements Categorized as:
December 31, 2017:							Level 1		Level 2			Level 3
Financial assets:
Fixed income securities:
Municipal obligations	$	779,834		$	779,834		$	—	$	779,834		$	—
Corporate obligations	860,075			860,075			450		859,625			—
Foreign obligations	26,543			26,543			25,615		928			—
U.S. government obligations	85,408			85,408			85,408		—			—
Residential mortgage-backed securities	2,251,333			2,251,333			—		1,515,316			736,017
Collateralized debt obligations	51,037			51,037			—		51,037			—
Other asset-backed securities	597,942			597,942			—		525,402			72,540
Fixed income securities, pledged as collateral:
U.S. government obligations	99,719			99,719			99,719		—			—
Short term investments	557,270			557,270			389,299		167,971			—
Other investments (1)	431,630			413,977			56,498		29,750			17,288
Cash and cash equivalents	623,703			623,703			615,073		8,630			—
Loans	10,358			10,284			—		—			10,284
Derivative assets:
Interest rate swaps—asset position	73,199			73,199			—		11,825			61,374
Other assets	5,979			5,979			—		—			5,979
Variable interest entity assets:
Fixed income securities:
Corporate obligations	2,914,145			2,914,145			—		—			2,914,145
Restricted cash	978			978			978		—			—
Loans	11,529,384			11,529,384			—		—			11,529,384
Derivative assets:
Currency swaps—asset position	54,877			54,877			—		54,877			—
Total financial assets	$	20,853,695		$	20,835,968		$	1,173,321	$	4,005,195		$	15,347,011
Financial liabilities:
Long term debt, including accrued interest	$	1,428,680		$	1,369,499		$	—	$	1,046,511		$	322,988
Derivative liabilities:
Credit derivatives	566			566			—		—			566
Interest rate swaps—asset position	(627		)	(627		)	—		(627		)	—
Interest rate swaps—liability position	81,495			81,495			—		81,495			—
Futures contracts	1,348			1,348			1,348		—			—
Liabilities for net financial guarantees written (2)	3,435,438			4,842,402			—		—			4,842,402
Variable interest entity liabilities:
Long-term debt	12,160,544			12,160,544			—		9,402,856			2,757,688
Derivative liabilities:
Interest rate swaps—liability position	2,205,264			2,205,264			—		2,205,264			—
Total financial liabilities	$	19,312,708		$	20,660,491		$	1,348	$	12,735,499		$	7,923,644

(1) Excluded from the fair value measurement categories in the table above are investment funds of $326,152 and $310,441 as of March 31, 2018 and December 31, 2017, respectively, which are measured using NAV per share as a practical expedient.

(2) The carrying value of net financial guarantees written includes the following balance sheet items: Premium receivables; Reinsurance recoverable on paid and unpaid losses; Deferred ceded premium; Subrogation recoverable; Insurance intangible asset; Unearned premiums; Loss and loss expense reserves; Ceded premiums payable, premiums taxes payable and other deferred fees recorded in Other liabilities.

Determination of Fair Value:

When available, Ambac uses quoted active market prices specific to the financial instrument to determine fair value, and classifies such items within Level 1. The determination of fair value for financial instruments categorized in Level 2 or 3 involves significant judgment due to the complexity of factors contributing to the valuation. Third-party sources from which we obtain independent market quotes also use assumptions,

| Ambac Financial Group, Inc. 262018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

judgments and estimates in determining financial instrument values and different third parties may use different methodologies or provide different values for financial instruments. In addition, the use of internal valuation models may require assumptions about hypothetical or inactive markets. As a result of these factors, the actual trade value of a financial instrument in the market, or exit value of a financial instrument position by Ambac, may be significantly different from its recorded fair value.

Ambac’s financial instruments carried at fair value are mainly comprised of investments in fixed income securities, equity interests in pooled investment funds, derivative instruments, variable interest entity assets and liabilities and interests in Ambac sponsored special purpose entities. Valuation of financial instruments is performed by Ambac’s finance group using methods approved by senior financial management with consultation from risk management and portfolio managers as appropriate. Preliminary valuation results are discussed with portfolio managers quarterly to assess consistency with market transactions and trends as applicable. Market transactions such as trades or negotiated settlements of similar positions, if any, are reviewed to validate fair value model results. However many of the financial instruments valued using significant unobservable inputs have very little or no observable market activity. Methods and significant inputs and assumptions used to determine fair values across portfolios are reviewed quarterly by senior financial management. Other valuation control procedures specific to particular portfolios are described further below.

We reflect Ambac’s own creditworthiness in the fair value of financial liabilities by including a credit valuation adjustment (“CVA”) in the determination of fair value. A decline (increase) in Ambac’s creditworthiness as perceived by market participants will generally result in a higher (lower) CVA, thereby lowering (increasing) the fair value of Ambac’s financial liabilities as reported.

Fixed Income Securities:

The fair values of fixed income investment securities are based primarily on market prices received from dealer quotes or alternative pricing sources with reasonable levels of price transparency. Because many fixed income securities do not trade on a daily basis, pricing sources apply available market information through processes such as matrix pricing to calculate fair value. Such prices generally consider a variety of factors, including recent trades of the same and similar securities. In those cases, the items are classified within Level 2. For those fixed income investments where quotes were not available or cannot be reasonably corroborated, fair values are based on internal valuation models. Key inputs to the internal valuation models generally include maturity date, coupon and yield curves for asset-type and credit rating characteristics that closely match those characteristics of the specific investment securities being valued. Items valued using valuation models are classified according to the lowest level input or value driver that is significant to the valuation. Thus, an item may be classified in Level 3 even though there may be significant inputs that are readily observable. Longer (shorter) expected maturities or higher (lower) yields used in the valuation model will, in isolation, result in decreases (increases) in fair value. Generally, lower credit ratings or longer expected maturities will be accompanied by higher yields used to value a security. At March 31, 2018, approximately 8%, 90% and 2% of the fixed income investment portfolio (excluding variable interest entity investments) was valued using dealer quotes, alternative pricing sources with reasonable levels of price transparency and internal valuation models, respectively. At December 31, 2017, approximately 6%, 79% and 15% of the fixed income investment portfolio (excluding variable interest entity investments) was valued using dealer quotes, alternative pricing sources with reasonable levels of price transparency and internal valuation models, respectively. At December 31, 2017, among the investments valued using internal valuation models were Ambac insured securities for which projected cash flows consisted solely of Deferred Amounts and interest thereon. These securities were internally valued based upon the valuation of Ambac Assurance's surplus notes and comprised 13% of the portfolio at December 31, 2017.

Ambac performs various review and validation procedures to quoted and modeled prices for fixed income securities, including price variance analyses, missing and static price reviews, overall valuation analysis by senior traders and finance managers and reviews associated with our ongoing impairment analysis. Unusual prices identified through these procedures will be evaluated further against alternative third party quotes (if available) and/or internally modeled prices, and the pricing source values will be challenged as necessary. Price challenges generally result in the use of the pricing source’s quote as originally provided or as revised by the source following their internal diligence process. A price challenge may result in a determination by either the pricing source or Ambac management that the pricing source cannot provide a reasonable value for a security or cannot adequately support a quote, in which case Ambac would resort to using either other quotes or internal models. Results of price challenges are reviewed by senior traders and finance managers.

Information about the valuation inputs for fixed income securities classified as Level 3 is included below:

Residential mortgage-backed securities: A portion of these securities were guaranteed under policies that were subject to the Segregated Account Rehabilitation Plan and had projected future cash flows consisting solely of Deferred Amounts under such policies including interest thereon. As described in Note 1. Background and Business Description, upon consummation of the Rehabilitation Exit Transactions on February 12, 2018, all Deferred Amounts have been settled. The fair value of such securities classified as Level 3 was $0 and $709,950 at March 31, 2018 and December 31, 2017, respectively. Fair value was calculated based on the valuation of Ambac Assurance surplus notes which, under the terms of the Segregated Account Rehabilitation Plan, were to be redeemed in proportion with the payment of Deferred Amounts on or about the dates when such payments were to be made.

The remaining portion of Level 3 residential mortgage-backed securities are an Ambac-insured re-REMIC containing distressed mortgage-backed securities as collateral, the fair value of which was $5,309 at March 31, 2018 and $26,067 as of December 31, 2017. Fair value was calculated using a discounted cash flow approach with expected future cash flows discounted using a yield consistent with the security type and rating. Significant inputs for the valuations at March 31, 2018 and December 31, 2017 were as follows:

| Ambac Financial Group, Inc. 272018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

March 31, 2018		December 31, 2017:
a. Coupon rate:	2.38%	a. Coupon rate:	2.05%
b. Average Life:	1.42 years	b. Average Life:	0.65 years
c. Yield:	10.00%	c. Yield:	10.00%

Other asset-backed securities: These securities are a subordinated tranche of a resecuritization collateralized by Ambac-insured military housing bonds. The fair value of such securities classified as Level 3 was $72,321 and $72,540 at March 31, 2018 and December 31, 2017, respectively. Fair value was calculated using a discounted cash flow approach with expected future cash flows discounted using a yield consistent with the security type and rating. Significant inputs for the valuation at March 31, 2018 and December 31, 2017 include the following weighted averages:

March 31, 2018:		December 31, 2017:
a. Coupon rate:	5.97%	a. Coupon rate:	5.97%
b. Average Life:	16.84 years	b. Maturity:	17.02 years
c. Yield:	12.00%	c. Yield:	12.00%

Other Investments:

Other investments primarily relate to investments in pooled investment funds. The fair value of pooled investment funds is determined using dealer quotes or alternative pricing sources when such investments have readily determinable fair values. When fair value is not readily determinable, pooled investment funds are valued using the net asset value (“NAV”) per share as a practical expedient as permitted under the Fair Value Measurement Topic of the ASC. Refer to Note 8. Investments for additional information about such investments in pooled funds that are reported at fair value using NAV as a practical expedient.

Other investments also includes Ambac's equity interest in a non-consolidated VIE, which is carried under the equity method. Valuation of this equity interest is internally calculated using a discounted cash flow approach and is classified as Level 3.

Derivative Instruments:

Ambac’s derivative instruments primarily comprise interest rate and credit default swaps and exchange traded futures contracts. Fair value is determined based upon market quotes from independent sources, when available. When independent quotes are not available, fair value is determined using valuation models. These valuation models require market-driven inputs, including contractual terms, credit spreads and ratings on underlying referenced obligations, yield curves and tax-exempt interest ratios. The valuation of certain interest rate as well as all credit derivative contracts also require the use of data inputs and assumptions that are determined by management and are not readily observable in the market. Under the Fair Value Measurement Topic of the ASC, Ambac is required to consider its own credit risk when measuring the fair value of derivatives. Interest rate swaps may also require an adjustment to fair value to reflect Ambac’s credit risk. Additional factors considered in estimating the amount of any Ambac CVA on such contracts include collateral posting provisions, right of set-off with the counterparty, the period of time remaining on the derivative and the pricing of recent terminations.

As described further below, certain valuation models require other inputs that are not readily observable in the market. The selection of a model to value a derivative depends on the contractual terms of, and specific risks inherent in the instrument as well as the availability of pricing information in the market.

Derivatives that are less complex may be valued primarily by reference to interest rates and yield curves that are observable and regularly quoted, such as interest rate swaps, for which we generally utilize vendor-developed models. These models provide the net present value of the derivatives based on contractual terms and observable market data. Downgrades of Ambac Assurance, as guarantor of the derivatives, have increased collateral requirements and triggered termination provisions in certain interest rate swaps. Termination activity since the initial rating downgrades of Ambac Assurance provided additional information about the replacement and/or exit value of certain derivatives, which has been incorporated into the fair value of these derivatives as appropriate. Generally, the need for counterparty (or Ambac) CVAs is mitigated by the existence of collateral posting agreements under which adequate collateral has been posted. Derivative contracts entered into with financial guarantee customers are not subject to collateral posting agreements. Counterparty credit risk related to such customer derivative assets is included in our fair value adjustments.

For derivatives that do not trade, or trade in less liquid markets such as credit derivatives, an internal model is generally used because such instruments tend to be unique, contain complex or heavily modified and negotiated terms and pricing information is not readily available in the market. Derivative fair value models and the related assumptions are continuously re-evaluated by management and enhanced, as appropriate, based on improvements in modeling techniques. Ambac has not made any significant changes to its modeling techniques or related model inputs for the periods presented.

| Ambac Financial Group, Inc. 282018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Credit Derivatives (“CDS”):

Fair value of Ambac’s CDS is determined using internal valuation models and represents the hypothetical transfer cost of the contract calculated as the difference between the net present value of the projected fees receivable under the CDS and our estimate of the fees a financial guarantor of comparable credit quality would charge to provide the same protection at the balance sheet date. Financial guarantee contracts, including CDS, are typically priced to capture some portion of the spread that would be observed in the capital markets for the underlying (insured) obligation. Because of this relationship and in the absence of severe credit deterioration, changes in the fair value of our credit default swaps will generally be less than changes in the fair value of the underlying reference obligations.

Key variables used in the valuation of our credit derivatives include the balance of unpaid notional, expected term, fair values of the underlying reference obligations, reference obligation credit ratings and the CVA applied against Ambac Assurance liabilities by market participants. Notional balances, expected remaining term and reference obligation credit ratings are monitored and determined by Ambac’s portfolio risk management group. Fair values of the underlying reference obligations are obtained from broker quotes when available or are estimated internally using the same methodologies used to value Ambac’s fixed income securities in its investment portfolio.

Ambac reflects changes in reference obligation credit ratings within the fair value of its CDS contracts by changing the percentage of the obligation's market spread (over LIBOR) that would be captured as a CDS fee at the valuation date. We adjust this percentage (“relative change ratio”) in our valuations based on internal rating changes such that the resulting fair value liability of the CDS contract, excluding the effect of Ambac's own credit risk, will increase up to the full amount of the unrealized loss on the reference obligation as the credit rating declines. Ambac incorporates its own credit risk into the valuation of its CDS liabilities by applying a CVA to the calculations described above. The Ambac CVA represents the difference between the present value of the hypothetical fees discounted at LIBOR compared to discount rates that incorporate Ambac credit risk.

Information about the above described model inputs used to determine the fair value of credit derivatives, including the CVA as a percentage of the gross mark-to-market liability before considering Ambac credit risk (“CVA percentage”), as of March 31, 2018 and December 31, 2017 is summarized below:

	March 31, 2018				December 31, 2017
Number of CDS transactions		2			2
Notional outstanding		$	330,656		$	325,890
Weighted average reference obligation price		98.6			99.3
Weighted average life (WAL) in years		6.3			6.5
Weighted average credit rating		A			A
Weighted average relative change ratio		23.4		%	23.6		%
CVA percentage		9.25		%	9.64		%
Fair value of derivative liabilities		$	1,018		$	566

The maximum potential amount of future payments under Ambac’s credit derivative contracts is generally the gross notional outstanding amount included in the above table plus future interest payments by the derivative reference obligations. Since Ambac’s credit derivatives typically reference obligations of or assets held by special purpose entities that meet the definition of a VIE, the amount of maximum potential future payments for credit derivatives is included in the table in Note 3. Special Purpose Entities, Including Variable Interest Entities.

Changes in fair value are recorded in “Net change in fair value of credit derivatives” on the Consolidated Statements of Total Comprehensive Income (Loss). Although CDS contracts are accounted for at fair value, they are surveilled similar to non-derivative financial guarantee contracts. As with financial guarantee insurance policies, Ambac’s Risk Management group tracks credit migration of CDS contracts’ reference obligations from period to period. Credits are assigned risk classifications by the Risk Management group. As of March 31, 2018, there are no CDS contracts on Ambac’s adversely classified credit listing.

Significant unobservable inputs for credit derivatives include WAL, internal credit rating, relative change ratio and CVA percentage. A longer (shorter) WAL, lower (higher) reference obligation credit rating, higher (lower) relative change ratio or lower (higher) CVA, in isolation, would result in an increase (decrease) in the fair value liability measurement. A change in an internal credit rating of a reference obligation in our model will generally result in a directionally opposite change in the relative change ratio. Also, a shorter (longer) WAL will generally correspond with a lower (higher) CVA percentage.

Financial Guarantees:

Fair value of net financial guarantees written represents our estimate of the cost to Ambac to completely transfer its insurance obligation to another market participant of comparable credit worthiness. In theory, this amount should be the same amount that another market participant of comparable credit worthiness would hypothetically charge in the market place, on a present value basis, to provide the same protection as of

| Ambac Financial Group, Inc. 292018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

the balance sheet date. This fair value estimate of financial guarantees is presented on a net basis and includes direct and assumed contracts written, net of ceded reinsurance contracts.

The fair value estimate of financial guarantees is computed by utilizing cash flows calculated at the policy level. For direct and assumed contracts, net cash flows for each policy includes future: (i) installment premium receipts, (ii) gross claim payments, (iii) subrogation receipts, and, (iv) at December 31, 2017, unpaid claims on claims presented and not yet paid for policies allocated to the Segregated Account, including Deferred Amounts and interest thereon. The timing of future claim payments of the Segregated Account was at the sole discretion of the Rehabilitator until the Segregated Account rehabilitation was concluded on February 12, 2018. For ceded reinsurance contracts, net cash flows for each policy includes future: (i) installment ceded premium payments, (ii) ceding commission receipts, (iii) ceded claim receipts, and (iv) ceded subrogation payments. For each assumed,or ceded reinsurance contract, the respective undiscounted cash flow components are aggregated to determine if we are in a net asset or net liability position. U.S. GAAP requires that the nonperformance risk of a financial liability be included in the estimation of fair value, which includes considering Ambac Assurance’s own credit risk. Accordingly, for each contract in a net liability position, we estimate the fair value using internally developed discount rates and market pricing that incorporate Ambac’s own credit risk and subsequently apply a profit margin. This profit margin represents what another market participant would require to assume the financial guarantee contracts. A profit margin was developed based on discussions with the third-party institutions with valuation expertise and discussions with industry participants. The discount rates used for contracts in a net liability position are derived from the rates implicit in the fair value of surplus notes and guaranteed securities with future cash flows that are highly dependent upon Ambac financial guarantee payments. For each contract in a net asset position, we estimate the fair value using a discount rate that is commensurate with a hypothetical buyer’s cost of capital.

This methodology is based on management’s expectations of how a market participant would estimate net cash flows. We are aware of a number of factors that may cause such fair or exit value to differ, perhaps materially. For example, (i) since no financial guarantor with Ambac Assurance’s credit quality is writing or otherwise obtaining financial guarantee business (e.g. reinsurance or novation of policies from other insurers) we do not have access to observable pricing data points and (ii) at December 31, 2017, certain segments of Ambac's financial guarantees were allocated to the Segregated Account and timing of the payments of such liabilities were at the sole discretion of the Rehabilitator.

Long-term Debt:

Long-term debt includes Ambac Assurance senior surplus notes and junior surplus notes, notes outstanding to third parties arising from Ambac Assurance's secured borrowing transaction and the Ambac Note and Tier 2 Notes issued in connection with the Rehabilitation Exit Transactions. The fair values of senior surplus notes, the secured borrowing notes and the Ambac Note are classified as Level 2. The fair value of junior surplus notes and Tier 2 Notes are classified as Level 3.

Other Financial Assets and Liabilities:

The fair values of Loans and Ambac’s equity interest in Ambac sponsored special purpose entities (included in Other assets) are estimated based upon internal valuation models and are classified as Level 3.

Variable Interest Entity Assets and Liabilities:

The financial assets and liabilities of VIEs consolidated under the Consolidation Topic of the ASC consist primarily of fixed income securities, loans, derivative and debt instruments and are generally carried at fair value. These consolidated VIEs are securitization entities which have liabilities and/or assets guaranteed by Ambac Assurance. The fair values of VIE debt instruments are determined using the same methodologies used to value Ambac’s fixed income securities in its investment portfolio as described above. VIE debt fair value is based on market prices received from dealer quotes or alternative pricing sources with reasonable levels of price transparency. Such quotes are considered Level 2 and generally consider a variety of factors, including recent trades of the same and similar securities. For those VIE debt instruments where quotes were not available, the debt instrument fair values are considered Level 3 and are based on internal discounted cash flow models. Comparable to the sensitivities of investments in fixed income securities described above, longer (shorter) expected maturities or higher (lower) yields used in the valuation model will, in isolation, result in decreases (increases) in fair value liability measurement for VIE debt. VIE debt instruments considered Level 3 include fixed rate, floating rate and zero coupon notes secured by various asset types, primarily European ABS. Information about the valuation inputs for the various VIE debt categories classified as Level 3 is as follows:

European ABS transactions: The fair value of such obligations classified as Level 3 was $2,696,517 and $2,757,688 at March 31, 2018 and December 31, 2017, respectively. Fair values were calculated by using a discounted cash flow approach. The discount rates used were based on the rates implied from the third party quoted values for comparable notes from the same securitization entity. Significant inputs for the valuation at March 31, 2018 and December 31, 2017 include the following weighted averages:

March 31, 2018:		December 31, 2017:
a. Coupon rate:	0.37%	a. Coupon rate:	0.40%
b. Maturity:	15.06 years	b. Maturity:	15.28 years
c. Yield:	5.35%	c. Yield:	4.82%

| Ambac Financial Group, Inc. 302018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

VIE derivative asset and liability fair values are determined using valuation models. When specific derivative contractual terms are available and may be valued primarily by reference to interest rates, foreign exchange rates and yield curves that are observable and regularly quoted, the derivatives are valued using vendor-developed models. Other derivatives within the VIEs that include significant unobservable valuation inputs are valued using internally developed models. VIE derivative fair value balances at March 31, 2018 and December 31, 2017 were developed using vendor-developed models and do not use significant unobservable inputs.

The fair value of VIE assets are obtained from market quotes when available. Typically VIE asset fair values are not readily available from market quotes and are estimated internally. The consolidated VIEs are securitization entities in which net cash flows from assets and derivatives (after adjusting for financial guarantor cash flows and other expenses) will be paid out to note holders or equity interests. Our valuation of VIE assets (fixed income securities or loans), therefore, are derived from the fair value of notes and derivatives, as described above, adjusted for the fair value of cash flows from Ambac’s financial guarantee. The fair value of financial guarantee cash flows include: (i) estimated future premiums discounted at a rate consistent with that implicit in the fair value of the VIE’s liabilities and (ii) internal estimates of future loss payments by Ambac discounted at a rate that includes Ambac’s own credit risk. Estimated future premium payments to be paid by the VIEs were discounted at a weighted average rate of 3.3% and 3.1% at March 31, 2018 and December 31, 2017, respectively. The value of future loss payments to be paid by Ambac to the VIEs was adjusted to include an Ambac CVA appropriate for the term of expected Ambac claim payments.

Additional Fair Value Information for Financial Assets and Liabilities Accounted for at Fair Value:

The following tables present the changes in the Level 3 fair value category for the periods presented in 2018 and 2017. Ambac classifies financial instruments in Level 3 of the fair value hierarchy when there is reliance on at least one significant unobservable input to the valuation model. In addition to these unobservable inputs, the valuation models for Level 3 financial instruments typically also rely on a number of inputs that are readily observable either directly or indirectly. Thus, the gains and losses presented below include changes in the fair value related to both observable and unobservable inputs.

| Ambac Financial Group, Inc. 312018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Level 3 - Financial Assets and Liabilities Accounted for at Fair Value
										VIE Assets and Liabilities
	Investments			Other Assets			Derivatives			Investments			Loans			Long-term Debt			Total
Three Months Ended March 31, 2018:
Balance, beginning of period	$	808,557		$	5,979		$	60,808		$	2,914,145		$	11,529,384		$	(2,757,688	)	$	12,561,185
Total gains/(losses) realized and unrealized:
Included in earnings	35,184			(358		)	(9,375		)	(69,026		)	(202,588		)	159,985			(86,178		)
Included in other comprehensive income	(52,508		)	—			—			110,644			423,892			(103,877		)	378,151
Purchases	—			—			—			—			—			—			—
Issuances	—			—			—			—			—			—			—
Sales	—			—			—			—			—			—			—
Settlements	(713,603		)	—			(1,525		)	—			(192,357		)	5,064			(902,421		)
Transfers into Level 3	—			—			—			—			—			—			—
Transfers out of Level 3	—			—			—			—			—			—			—
Balance, end of period	$	77,630		$	5,621		$	49,908		$	2,955,763		$	11,558,331		$	(2,696,516	)	$	11,950,737
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	—		$	(358	)	$	(9,481	)	$	(69,026	)	$	(202,588	)	$	159,985		$	(121,468	)
Three Months Ended March 31, 2017:
Balance, beginning of period	$	762,703		$	7,382		$	(100,282	)	$	2,622,566		$	10,658,963		$	(2,582,220	)	$	11,369,112
Total gains/(losses) realized and unrealized:
Included in earnings	9,819			(343		)	(2,817		)	(5,195		)	346,192			(94,407		)	253,249
Included in other comprehensive income	6,285			—			—			46,348			183,549			(46,257		)	189,925
Purchases	9,851			—			—			—			—			—			9,851
Issuances	—			—			—			—			—			—			—
Sales	(79,319		)	—			—			—			—			—			(79,319		)
Settlements	(9,793		)	—			511			—			(173,399		)	6,242			(176,439		)
Transfers into Level 3	22,078			—			—			—			—			—			22,078
Transfers out of Level 3	—			—			—			—			—			—			—
Balance, end of period	$	721,624		$	7,039		$	(102,588	)	$	2,663,719		$	11,015,305		$	(2,716,642	)	$	11,588,457
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	—		$	(343	)	$	(3,017	)	$	(5,195	)	$	346,192		$	(94,407	)	$	243,230

| Ambac Financial Group, Inc. 322018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

The tables below provide roll-forward information by class of investments and derivatives measured using significant unobservable inputs.

Level 3 - Investments by Class:
	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
	Other Asset Backed Securities			Non-Agency RMBS			Total Investments			Other Asset Backed Securities			Non-Agency RMBS			Total Investments
Balance, beginning of period	$	72,540		$	736,017		$	808,557		$	65,990		$	696,713		$	762,703
Total gains/(losses) realized and unrealized:
Included in earnings	457			34,727			35,184			353			9,466			9,819
Included in other comprehensive income	(370		)	(52,138		)	(52,508		)	(279		)	6,564			6,285
Purchases	—			—			—			—			9,851			9,851
Issuances	—			—			—			—			—			—
Sales	—			—			—			—			(79,319		)	(79,319		)
Settlements	(306		)	(713,297		)	(713,603		)	(257		)	(9,536		)	(9,793		)
Transfers into Level 3	—			—			—			—			22,078			22,078
Transfers out of Level 3	—			—			—			—			—			—
Balance, end of period	$	72,321		$	5,309		$	77,630		$	65,807		$	655,817		$	721,624
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	—		$	—		$	—		$	—		$	—		$	—

Level 3 - Derivatives by Class:
	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
	Interest Rate Swaps			Credit Derivatives			Total Derivatives			Interest Rate Swaps			Credit Derivatives			Total Derivatives
Balance, beginning of period	$	61,374		$	(566	)	$	60,808		$	(84,933	)	$	(15,349	)	$	(100,282	)
Total gains/(losses) realized and unrealized:
Included in earnings	(9,029		)	(346		)	(9,375		)	(3,869		)	1,052			(2,817		)
Included in other comprehensive income	—			—			—			—			—			—
Purchases	—			—			—			—			—			—
Issuances	—			—			—			—			—			—
Sales	—			—			—			—			—			—
Settlements	(1,419		)	(106		)	(1,525		)	710			(199		)	511
Transfers into Level 3	—			—			—			—			—			—
Transfers out of Level 3	—			—			—			—			—			—
Balance, end of period	$	50,926		$	(1,018	)	$	49,908		$	(88,092	)	$	(14,496	)	$	(102,588	)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	(9,029	)	$	(452	)	$	(9,481	)	$	(3,869	)	$	852		$	(3,017	)

Invested assets and VIE long-term debt are transferred into Level 3 when internal valuation models that include significant unobservable inputs are used to estimate fair value. All such securities that have internally modeled fair values have been classified as Level 3. Non-agency RMBS securities transferred into Level 3 in 2017 consist of an Ambac-insured re-REMIC collateralized by distressed mortgage-backed securities.

Derivative instruments are transferred into Level 3 when the use of unobservable inputs becomes significant to the overall valuation. There were no transfers of derivative instruments into or out of Level 3 in the periods disclosed. There were no transfers between Level 1 and Level 2 for the periods presented. All transfers between fair value hierarchy Levels 1, 2, and 3 are recognized at the beginning of each accounting period.

| Ambac Financial Group, Inc. 332018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Gains and losses (realized and unrealized) relating to Level 3 assets and liabilities included in earnings for the affected periods are reported as follows:

	Net Investment Income		Realized Gains or (Losses) and Other Settlements on Credit Derivative Contracts		Unrealized Gains or (Losses) on Credit Derivative Contracts			Derivative Products Revenues (Interest Rate Swaps)			Income (Loss) on Variable Interest Entities			Other Income or (Loss)
Three Months Ended March 31, 2018:
Total gains or losses included in earnings for the period	$	35,184	$	—	$	(452	)	$	(9,029	)	$	(111,629	)	$	(358	)
Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date	—		—		(452		)	(9,029		)	(111,629		)	(358		)
Three Months Ended March 31, 2017:
Total gains or losses included in earnings for the period	$	9,819	$	199	$	853		$	(3,869	)	$	246,590		$	(343	)
Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date	—		—		852			(3,869		)	246,590			(343		)

| Ambac Financial Group, Inc. 342018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

8. INVESTMENTS

Ambac’s non-VIE invested assets are primarily comprised of fixed income securities classified as available-for-sale and equity interests in pooled investment funds. Such equity interests in the form of common stock or in-substance common stock are classified as trading securities and are reported within Other investments on the Consolidated Balance Sheets. Other investments also include Ambac's debt (at December 31, 2017 only) and equity interests in an unconsolidated trust created in connection with its sale of Segregated Account junior surplus notes on August 28, 2014.

Fixed Income Securities:

The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at March 31, 2018 and December 31, 2017 were as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Non-credit Other-than temporary Impairments (1)
March 31, 2018:
Fixed income securities:
Municipal obligations	$	853,001	$	14,307	$	11,921	$	855,387	$	109
Corporate obligations (2)	1,445,586		12,216		18,809		1,438,993		—
Foreign obligations	26,425		238		268		26,395		—
U.S. government obligations	90,281		119		3,139		87,261		—
Residential mortgage-backed securities	726,998		101,218		4,920		823,296		4,854
Collateralized debt obligations	50,754		204		—		50,958		—
Other asset-backed securities	520,863		69,678		893		589,648		—
	3,713,908		197,980		39,950		3,871,938		4,963
Short-term	321,210		4		95		321,119		—
	4,035,118		197,984		40,045		4,193,057		4,963
Fixed income securities pledged as collateral:
U.S. government obligations	84,240		—		—		84,240		—
Total collateralized investments	84,240		—		—		84,240		—
Total available-for-sale investments	$	4,119,358	$	197,984	$	40,045	$	4,277,297	$	4,963
December 31, 2017:
Fixed income securities:
Municipal obligations	$	845,778	$	3,456	$	69,400	$	779,834	$	—
Corporate obligations	858,774		6,772		5,471		860,075		—
Foreign obligations	26,245		409		111		26,543		—
U.S. government obligations	86,900		261		1,753		85,408		—
Residential mortgage-backed securities	2,214,512		67,303		30,482		2,251,333		23,832
Collateralized debt obligations	50,754		283		—		51,037		—
Other asset-backed securities	531,660		66,899		617		597,942		—
	4,614,623		145,383		107,834		4,652,172		23,832
Short-term	557,476		3		209		557,270		—
	5,172,099		145,386		108,043		5,209,442		23,832
Fixed income securities pledged as collateral:
U.S. government obligations	99,719		—		—		99,719		—
Total collateralized investments	99,719		—		—		99,719		—
Total available-for-sale investments	$	5,271,818	$	145,386	$	108,043	$	5,309,161	$	23,832

(1) Represents the amount of non-credit other-than-temporary impairment losses remaining in accumulated other comprehensive income on securities that also had a credit impairment. These losses are included in gross unrealized losses as of March 31, 2018 and December 31, 2017.

(2) Includes Ambac's holdings of the secured notes issued by Ambac LSNI in connection with the Rehabilitation Exit Transactions.

| Ambac Financial Group, Inc. 352018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at March 31, 2018, by contractual maturity, were as follows:

	Amortized Cost		Estimated Fair Value
Due in one year or less	$	461,954	$	461,683
Due after one year through five years	1,237,724		1,239,764
Due after five years through ten years	287,768		279,803
Due after ten years	833,297		832,145
	2,820,743		2,813,395
Residential mortgage-backed securities	726,998		823,296
Collateralized debt obligations	50,754		50,958
Other asset-backed securities	520,863		589,648
Total	$	4,119,358	$	4,277,297

Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay certain obligations with or without call or prepayment penalties.

Unrealized Losses on Fixed Income Securities:

The following table shows gross unrealized losses and fair values of Ambac’s available-for-sale investments, excluding VIE investments, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at March 31, 2018 and December 31, 2017:

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
March 31, 2018:
Fixed income securities:
Municipal obligations	$	495,224	$	10,775	$	30,590	$	1,146	$	525,814	$	11,921
Corporate obligations	457,056		13,566		106,696		5,243		563,752		18,809
Foreign obligations	13,806		217		1,736		51		15,542		268
U.S. government obligations	77,446		3,067		3,423		72		80,869		3,139
Residential mortgage-backed securities	13,321		531		101,462		4,389		114,783		4,920
Other asset-backed securities	34,288		123		77,184		770		111,472		893
	1,091,141		28,279		321,091		11,671		1,412,232		39,950
Short-term	120,661		95		—		—		120,661		95
Total temporarily impaired securities	$	1,211,802	$	28,374	$	321,091	$	11,671	$	1,532,893	$	40,045

| Ambac Financial Group, Inc. 362018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
December 31, 2017:
Fixed income securities:
Municipal obligations	$	667,335	$	68,578	$	32,525	$	822	$	699,860	$	69,400
Corporate obligations	292,028		3,377		87,272		2,094		379,300		5,471
Foreign obligations	8,122		81		1,700		30		9,822		111
U.S. government obligations	74,188		1,653		5,525		100		79,713		1,753
Residential mortgage-backed securities	668,524		12,524		418,617		17,958		1,087,141		30,482
Other asset-backed securities	26,655		58		88,023		559		114,678		617
	1,736,852		86,271		633,662		21,563		2,370,514		107,834
Short-term	251,926		209		—		—		251,926		209
Total temporarily impaired securities	$	1,988,778	$	86,480	$	633,662	$	21,563	$	2,622,440	$	108,043

Management has determined that the unrealized losses reflected in the tables above are temporary in nature as of March 31, 2018 and December 31, 2017 based upon (i) no unexpected principal and interest payment defaults on these securities; (ii) analysis of the creditworthiness of the issuer and financial guarantor, as applicable, and analysis of projected defaults on the underlying collateral; (iii) management has no intent to sell these investments in debt securities; and (iv) it is not more likely than not that Ambac will be required to sell these debt securities before the anticipated recovery of its amortized cost basis. The assessment under (iv) is based on a comparison of future available liquidity from the investment portfolio against the projected net cash outflow from operating activities and debt service. For purposes of this assessment, available liquidity from the investment portfolio is comprised of the fair value of securities for which management has asserted its intent to sell, the fair value of other securities that are available for sale and in an unrealized gain position, trading securities plus the scheduled maturities and interest payments from the remaining securities in the portfolio. To the extent that securities that management intends to sell are in an unrealized loss position, they would have already been considered other-than-temporarily impaired with the amortized cost written down to fair value. Because the above-described assessment indicates that future available liquidity exceeds projected net cash outflow, it is not more likely than not that we would be required to sell securities in an unrealized loss position before the recovery of their amortized cost basis. In the liquidity assessment described above, principal payments on securities pledged as collateral are not considered to be available for other liquidity needs until the collateralized positions are projected to be settled.

As of March 31, 2018, for securities that have indications of possible other-than-temporary impairment but which management does not intend to sell and will not more likely than not be required to sell, management compared the present value of cash flows expected to be collected to the amortized cost basis of the securities to assess whether the amortized cost will be recovered. Cash flows were discounted at the effective interest rate implicit in the security at the date of acquisition (or Fresh Start Reporting Date of April 30, 2013 for securities purchased prior to that date) or for debt securities that are beneficial interests in securitized financial assets, at a rate equal to the current yield used to accrete the beneficial interest. For floating rate securities, future cash flows and the discount rate used were both adjusted to reflect changes in the index rate applicable to each security as of the evaluation date. Of the securities that were in a gross unrealized loss position at March 31, 2018, $694,796 of the total fair value and $18,330 of the unrealized loss related to below investment grade and non-rated securities. Of the securities that were in a gross unrealized loss position at December 31, 2017, $1,855,694 of the total fair value and $100,503 of the unrealized loss related to below investment grade and non-rated securities. As discussed further below, most of the securities in a gross unrealized loss position that are below investment grade or non-rated are guaranteed by Ambac Assurance. Ambac’s assessment about whether a decline in value is other-than-temporary reflects management’s current judgment regarding facts and circumstances specific to a security and the factors noted above. If that judgment changes, Ambac may ultimately record a charge for other-than-temporary impairment in future periods.

Municipal obligations

The gross unrealized losses on municipal obligations as of March 31, 2018 are primarily the result of the price declines on Ambac-insured Puerto Rico bonds, especially Puerto Rico Sales Tax Financing Corporation's Senior Sales Tax Revenue bonds. These bonds are below investment grade, long-dated zero coupon securities subject to higher than average price volatility. These bonds suffered material downward price movement in late 2017 and subsequently recovered most of this lost value during the first quarter of 2018. Management has the ability and intent to hold these bonds and by virtue of the Ambac financial guarantee, believes that it is probable that all amounts due on the bonds will be paid timely and in full.

Corporate obligations

The gross unrealized losses on corporate obligations as of March 31, 2018 are primarily the result of the increase in interest rates since purchase (or the Fresh Start Reporting Date of April 30, 2013 if owned as of that date). These securities are primarily fixed-rate securities with an investment grade credit rating. Management believes that the timely receipt of all principal and interest on these positions is probable.

| Ambac Financial Group, Inc. 372018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Realized Gains and Losses and Other-Than-Temporary Impairments:

The following table details amounts included in net realized gains (losses) and other-than-temporary impairments included in earnings for the affected periods:

	Three Months Ended March 31,
	2018			2017
Gross realized gains on securities	$	11,054		$	2,659
Gross realized losses on securities	(1,388		)	(9,471		)
Net foreign exchange (losses) gains	(4,804		)	1,916
Net realized gains (losses)	$	4,862		$	(4,896	)
Net other-than-temporary impairments (1)	$	(299	)	$	(3,942	)

(1) Other-than-temporary impairments exclude impairment amounts recorded in other comprehensive income under ASC Paragraph 320-10-65-1, which comprise non-credit related amounts on securities that are credit impaired but which management does not intend to sell and it is not more likely than not that Ambac will be required to sell before recovery of the amortized cost basis.

During the Segregated Account Rehabilitation Proceedings, changes in the estimated timing of claim payments resulted in adverse changes in projected cash flows on certain impaired Ambac insured securities. Such changes in estimated claim payments on Ambac insured securities contributed to net other-than-temporary impairments for the three months ended March 31, 2017, presented in the table above. Future changes in our estimated liquidity needs could result in a determination that Ambac no longer has the ability to hold securities that are in an unrealized loss position, which could also result in additional other-than-temporary impairment charges.

The following table presents a roll-forward of Ambac’s cumulative credit losses on debt securities held as of March 31, 2018 and 2017 for which a portion of an other-than-temporary impairment was recognized in other comprehensive income:

	Three Months Ended March 31,
	2018			2017
Balance, beginning of period	$	67,085		$	52,070
Additions for credit impairments recognized on:
Securities not previously impaired	226			307
Securities previously impaired	64			1,985
Reductions for credit impairments previously recognized on:
Securities that matured or were sold during the period	(23,742		)	—
Balance, end of period	$	43,633		$	54,362

Counterparty Collateral, Deposits with Regulators and Other Restrictions:

Ambac routinely pledges and receives collateral related to certain transactions. Cash and securities held directly in Ambac’s investment portfolio with a fair value of $107,060 and $120,645 at March 31, 2018 and December 31, 2017, respectively, were pledged to derivative counterparties. Ambac’s derivative counterparties have the right to re-pledge the investment securities and as such, these pledged securities are separately classified on the Consolidated Balance Sheets as “Fixed income securities pledged as collateral, at fair value”. There was no cash or securities received from other counterparties that were re-pledged by Ambac.

Securities carried at $5,926 and $5,974 at March 31, 2018 and December 31, 2017, respectively, were deposited by Ambac Assurance and Everspan with governmental authorities or designated custodian banks as required by laws affecting insurance companies.

Securities with fair value of $256,553 and $346,212 at March 31, 2018 and December 31, 2017, respectively, were held by a bankruptcy remote trust to collateralize and fund repayment of debt issued through a re-securitization transaction. The securities may not be sold or repledged by the trust. These assets are held and the secured debt is issued by entities that qualify as VIEs and are consolidated in Ambac’s unaudited consolidated financial statements. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities for a further description of this transaction.

As further discussed in Note 1. Background and Business Description, Ambac LSNI, an unconsolidated special purpose entity, issued Secured Notes in connection with the Rehabilitation Exit Transactions of February 12, 2018. Securities with a fair value of $367,816 at March 31, 2018 were pledged as collateral and as sources of funding to repay the Secured Notes. The securities may not be sold or repledged by Ambac LSNI. Ambac LSNI qualifies as a VIE that is not consolidated in Ambac's unaudited consolidated financial statements.

Guaranteed Securities:

Ambac’s fixed income portfolio includes securities covered by guarantees issued by Ambac Assurance and other financial guarantors (“insured securities”). The published rating agency ratings on these securities reflect the higher of the financial strength rating of the financial guarantor

| Ambac Financial Group, Inc. 382018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

or the rating of the underlying issuer. Rating agencies do not always publish separate underlying ratings (those ratings excluding the insurance by the financial guarantor). In the event these underlying ratings are not available from the rating agencies, Ambac will assign an internal rating. The following table represents the fair value, including the value of the financial guarantee, and weighted-average underlying rating, excluding the financial guarantee, of the insured securities at March 31, 2018 and December 31, 2017, respectively: 

	Municipal Obligations		Corporate Obligations (3)		Mortgage and Asset- backed Securities		Total		Weighted Average Underlying Rating (1)
March 31, 2018:
Ambac Assurance Corporation (2)	$	785,791	$	813,720	$	1,283,502	$	2,883,013	CC
National Public Finance Guarantee Corporation	18,913		—		—		18,913		BBB-
Assured Guaranty Municipal Corporation	6,000		—		—		6,000		BBB+
Total	$	810,704	$	813,720	$	1,283,502	$	2,907,926	CC
December 31, 2017:
Ambac Assurance Corporation (2)	$	706,715	$	32,660	$	2,702,887	$	3,442,262	CC
National Public Finance Guarantee Corporation	20,733		—		—		20,733		BBB-
Assured Guaranty Municipal Corporation	5,998		—		—		5,998		BBB+
Total	$	733,446	$	32,660	$	2,702,887	$	3,468,993	CC

(1) Ratings are based on the lower of Standard & Poor’s or Moody’s rating. If unavailable, Ambac’s internal rating is used.

(2) Includes corporate obligations and asset-backed securities with a fair value of $169,943 and $170,280 at March 31, 2018 and December 31, 2017, respectively, insured by Ambac UK.

(3) 2018 includes Ambac's holdings of the secured notes issued by Ambac LSNI in connection with the Rehabilitation Exit Transactions. These secured notes are insured by Ambac Assurance.

Equity Interests:

Ambac's investment portfolio includes equity interests in various pooled investment funds, which are classified as trading. The fair value and additional information about such investments in pooled funds, by investment type, is summarized in the table below. Except as noted in the table, fair value reported is determined using NAV per share as a practical expedient. There are no unfunded commitments applicable to any of these investments for the periods disclosed.

	Fair Value
Class of Funds	March 31, 2018		December 31, 2017		Redemption Frequency	Redemption Notice Period
Real estate properties (1)	$	34,752	$	33,154	quarterly	10 business days
Diversified hedge fund strategies (2)	56,394		53,054		semi-monthly	15 - 30 days
Interest rate products (3) (7)	142,856		136,603		daily, weekly or monthly	0 - 30 days
Illiquid investments (4)	71,366		67,787		quarterly	180 days
Insurance-linked investments (5)	23,637		22,666		quarterly	90-120 days
Equity market investments (6) (7)	54,682		53,675		daily	0 days
Total equity investments in pooled funds	$	383,687	$	366,939

(1) Investments consist of UK property to generate income and capital growth.

(2) Investments seek diversified exposure to hedge fund core strategies to produce high risk-adjusted returns, with low long-term correlation to traditional markets and with targeted volatility levels. Funds may have the right to defer redemptions under certain circumstances.

(3) This class of funds includes investments in a range of instruments including leveraged loans, CLOs, asset-backed securities and floating rate notes to generate income and capital appreciation. Funds with less frequent redemption periods limit redemptions to as little as 15% per period. Funds with a same day redemption notice period are redeemable only weekly, while funds that may be redeemed any business day have notice periods of 15-30 days.

(4) This class seeks to obtain high long-term total return through investments with low liquidity and defined term, resulting in expected capital distributions to subscribers between 2020 and 2023. Redemptions cannot occur prior to the expiration of the investment lock-up period in May 2018.

(5) This class aims to provide returns from the insurance and reinsurance markets through investments in catastrophe bonds, life insurance and other insurance linked investments. Redemption periods are quarterly, subject to 90-day notice for January/July redemption dates and 120-day notice for April/October redemption dates with redemptions greater than 3.5% during the first five years following share issuance subject to redemption fees.

(6) Investments represent a diversified exposure to global equity market returns through holdings of various regional market index funds.

(7) Interest rate products include $2,853 at March 31, 2018 and $2,823 at December 31, 2017 and equity market investments include $54,682 at March 31, 2018 and $53,675 at December 31, 2017 that have readily determinable fair values priced through pricing vendors.

| Ambac Financial Group, Inc. 392018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Ambac also holds interests in an unconsolidated trust created in connection with the 2014 sale of Segregated Account junior surplus notes. The investment in debt securities is accounted for as trading and the equity interest is accounted for under the equity method.

Investment Income:

Net investment income was comprised of the following for the affected periods:

	Three Months Ended March 31,
	2018			2017
Fixed income securities	$	109,351		$	74,069
Short-term investments	2,840			989
Loans	187			89
Investment expense	(1,827		)	(1,997		)
Securities available-for-sale and short-term	110,551			73,150
Other investments	(311		)	8,409
Total net investment income	$	110,240		$	81,559

Net investment income from Other investments primarily represents changes in fair value on securities classified as trading or under the fair value option plus income from Ambac's interests in an unconsolidated trust created in connection with its sale of Segregated Account junior surplus notes. The portion of net unrealized gains (losses) related to trading securities still held at the end of each period is as follows:

	Three Months Ended March 31,
	2018			2017
Net gains (losses) recognized during the period on trading securities	$	(1,579	)	$	7,211
Less: net gains (losses) recognized during the reporting period on trading securities sold during the period	1,933			1,283
Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date	$	(3,512	)	$	5,928

| Ambac Financial Group, Inc. 402018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

9. DERIVATIVE INSTRUMENTS

The following tables summarize the gross fair values of individual derivative instruments and the impact of legal rights of offset as reported in the Consolidated Balance Sheets as of March 31, 2018 and December 31, 2017:

	Gross Amounts of Recognized Assets / Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet		Gross Amount of Collateral Received / Pledged Not Offset in the Consolidated Balance Sheet		Net Amount
March 31, 2018:
Derivative Assets:
Interest rate swaps	$	60,198	$	2	$	60,196	$	—	$	60,196
Total non-VIE derivative assets	$	60,198	$	2	$	60,196	$	—	$	60,196
Derivative Liabilities:
Credit derivatives	$	1,018	$	—	$	1,018	$	—	$	1,018
Interest rate swaps	70,568		2		70,566		69,545		1,021
Total non-VIE derivative liabilities	$	71,586	$	2	$	71,584	$	69,545	$	2,039
Variable Interest Entities Derivative Assets:
Currency swaps	$	46,260	$	—	$	46,260	$	—	$	46,260
Total VIE derivative assets	$	46,260	$	—	$	46,260	$	—	$	46,260
Variable Interest Entities Derivative Liabilities:
Interest rate swaps	$	2,155,456	$	—	$	2,155,456	$	—	$	2,155,456
Total VIE derivative liabilities	$	2,155,456	$	—	$	2,155,456	$	—	$	2,155,456
December 31, 2017:
Derivative Assets:
Interest rate swaps	$	73,826	$	627	$	73,199	$	—	$	73,199
Total non-VIE derivative assets	$	73,826	$	627	$	73,199	$	—	$	73,199
Derivative Liabilities:
Credit derivatives	$	566	$	—	$	566	$	—	$	566
Interest rate swaps	81,495		627		80,868		79,912		956
Futures contracts	1,348		—		1,348		1,348		—
Total non-VIE derivative liabilities	$	83,409	$	627	$	82,782	$	81,260	$	1,522
Variable Interest Entities Derivative Assets:
Currency swaps	$	54,877	$	—	$	54,877	$	—	$	54,877
Total VIE derivative assets	$	54,877	$	—	$	54,877	$	—	$	54,877
Variable Interest Entities Derivative Liabilities:
Interest rate swaps	$	2,205,264	$	—	$	2,205,264	$	—	$	2,205,264
Total VIE derivative liabilities	$	2,205,264	$	—	$	2,205,264	$	—	$	2,205,264

Amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivative instruments on the Consolidated Balance Sheets. The amounts representing the right to reclaim cash collateral and posted margin, recorded in “Other assets” were $22,820 and $20,926 as of March 31, 2018 and December 31, 2017, respectively. There were no amounts held representing an obligation to return cash collateral as of March 31, 2018 and December 31, 2017.

| Ambac Financial Group, Inc. 412018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

The following tables summarize the location and amount of gains and losses of derivative contracts in the Consolidated Statements of Total Comprehensive Income (Loss) for the three months endedMarch 31, 2018 and 2017:

	Location of Gain or (Loss) Recognized in Consolidated Statements of Total Comprehensive Income (Loss)	Amount of Gain or (Loss)  Recognized in Consolidated Statement of Total  Comprehensive Income (Loss)
		Three Months Ended March 31,
		2018			2017
Non-VIEs:
Credit derivatives	Net change in fair value of credit derivatives	$	(346	)	$	1,052
Non-VIE derivatives:
Interest rate swaps	Net gains (losses) on interest rate derivatives	4,543			108
Futures contracts	Net gains (losses) on interest rate derivatives	20,994			(1,622		)
Total Non-VIE derivatives		25,537			(1,514		)
Variable Interest Entities:
Currency swaps	Income (loss) on variable interest entities	(8,617		)	(4,948		)
Interest rate swaps	Income (loss) on variable interest entities	49,809			14,496
Total Variable Interest Entities		41,192			9,548
Total derivative contracts		$	66,383		$	9,086

Credit Derivatives:

Credit derivatives, which are privately negotiated contracts, provide the counterparty with credit protection against the occurrence of a specific event such as a payment default or bankruptcy relating to an underlying obligation. Upon a credit event, Ambac is required to make payments equal to the difference between the scheduled debt service payment and the actual payment made by the issuer. Credit derivatives issued are insured by Ambac Assurance. None of the outstanding credit derivative transactions at March 31, 2018 include ratings based collateral-posting triggers or otherwise require Ambac to post collateral regardless of Ambac’s ratings or the size of the mark to market exposure to Ambac.

The portfolio of our credit derivatives were written on a “pay-as-you-go” basis. Similar to an insurance policy execution, pay-as-you-go provides that Ambac pays interest shortfalls on the referenced transaction as they are incurred on each scheduled payment date, but only pays principal shortfalls upon the earlier of (i) the date on which the assets designated to fund the referenced obligation have been disposed of and (ii) the legal final maturity date of the referenced obligation.

Ambac maintains internal credit ratings on its guaranteed obligations, including credit derivative contracts, solely to indicate management’s view of the underlying credit quality of the guaranteed obligations. Independent rating agencies may have assigned different ratings on the credits in Ambac’s portfolio than Ambac’s internal ratings. The following table summarizes the gross principal notional outstanding for CDS contracts, by Ambac rating as of March 31, 2018 and December 31, 2017:

Ambac Rating	March 31, 2018		December 31, 2017
AAA	$	—	$	—
AA	176,631		175,765
A	—		—
BBB (1)	154,025		150,125
Below investment grade (2)	—		—
Total	$	330,656	$	325,890

(1) BBB internal ratings reflect bonds which are of medium grade credit quality with adequate capacity to pay interest and repay principal. Certain protective elements and margins may weaken under adverse economic conditions and changing circumstances. These bonds are more likely than higher rated bonds to exhibit unreliable protection levels over all cycles.

(2) Below investment grade internal ratings reflect bonds which are of speculative grade credit quality with the adequacy of future margin levels for payment of interest and repayment of principal potentially adversely affected by major ongoing uncertainties or exposure to adverse conditions.

| Ambac Financial Group, Inc. 422018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Interest Rate Derivatives:

Ambac, through its subsidiary Ambac Financial Services (“AFS”), provided interest rate swaps to states, municipalities and their authorities, asset-backed issuers and other entities in connection with their financings. Additionally, AFS uses interest rate derivatives as an economic hedge against the effects of rising interest rates elsewhere in the Company, including on Ambac’s financial guarantee exposures. As of March 31, 2018 and December 31, 2017 the notional amounts of AFS’s derivatives are as follows:

	Notional
Type of derivative	March 31, 2018		December 31, 2017
Interest rate swaps—receive-fixed/pay-variable	$	376,414	$	379,497
Interest rate swaps—pay-fixed/receive-variable	1,439,932		1,428,264
US Treasury futures contracts—short	1,805,000		1,655,000

Derivatives of Consolidated Variable Interest Entities

Certain VIEs consolidated under the Consolidation Topic of the ASC entered into derivative contracts to meet specified purposes within the securitization structure. The notional for VIE derivatives outstanding as of March 31, 2018 and December 31, 2017 are as follows:

	Notional
Type of VIE derivative	March 31, 2018		December 31, 2017
Interest rate swaps—receive-fixed/pay-variable	$	1,540,122	$	1,483,491
Interest rate swaps—pay-fixed/receive-variable	2,561,654		2,479,244
Currency swaps	402,231		394,541
Credit derivatives	11,865		12,100

Contingent Features in Derivatives Related to Ambac Credit Risk

Ambac’s over-the-counter interest rate swaps are centrally cleared when eligible. Certain interest rate swaps remain with professional swap-dealer counterparties and certain front-end counterparties. These non-cleared swaps are generally executed under standardized derivative documents including collateral support and master netting agreements. Under these agreements, Ambac is required to post collateral in the event net unrealized losses exceed predetermined threshold levels. Additionally, given that Ambac Assurance is no longer rated by an independent rating agency, counterparties have the right to terminate the swap positions.

As of March 31, 2018 and December 31, 2017, the net liability fair value of derivative instruments with contingent features linked to Ambac’s own credit risk was $69,545 and $79,912, respectively, related to which Ambac had posted cash and securities as collateral with a fair value of $98,280 and $111,391, respectively. All such ratings-based contingent features have been triggered as requiring maximum collateral levels to be posted by Ambac while preserving counterparties’ rights to terminate the contracts. Assuming all such contracts terminated on March 31, 2018, settlement of collateral balances and net derivative liabilities would result in a net receipt of cash and/or securities by Ambac. If counterparties elect to exercise their right to terminate, the actual termination payment amounts will be determined in accordance with derivative contract terms, which may result in amounts that differ from market values as reported in Ambac’s financial statements.

10.    LONG-TERM DEBT

The carrying value of long-term debt was as follows:

	March 31, 2018		December 31, 2017
Ambac Assurance:
5.1% surplus notes due 2020	$	260,993	$	668,667
5.1% junior surplus notes due 2020	249,226		249,036
Ambac Note	2,148,369		—
Tier 2 Notes	233,948		—
Secured borrowing	65,196		73,993
Ambac Assurance long-term debt	$	2,957,732	$	991,696
Variable Interest Entities long-term debt	$	12,270,124	$	12,160,544

| Ambac Financial Group, Inc. 432018 First Quarter FORM 10-Q |

Surplus Notes

Ambac Assurance surplus notes, with a par amount of $291,187 and $754,811 at March 31, 2018 and December 31, 2017, respectively, are reported in long-term debt on the Consolidated Balance Sheet and have a scheduled maturity of June 7, 2020. On February 12, 2018, the Rehabilitation Exit Transactions were consummated, resulting in a $463,624 reduction of consolidated surplus note par outstanding. Surplus notes outstanding were recorded at their fair value at the date of issuance. The discount on these notes is currently being accreted into income using the effective interest method at an imputed interest rate of of 10.5%. All payments of principal and interest on these surplus notes are subject to the prior approval of the OCI. Annually from 2011 through 2017, OCI issued its disapproval of the requests of Ambac Assurance to pay the full interest on outstanding surplus notes on the annual scheduled interest payment date of June 7th. If the OCI does not approve the payment of interest on these surplus notes, such interest will accrue and compound annually until paid. In connection with the Rehabilitation Exit Transactions, Ambac Assurance made a one-time current interest payment on remaining surplus notes (other than junior surplus notes) of $13,501, of which $2,618 was received by Ambac for surplus notes that it owns and that are considered extinguished for accounting purposes.

Junior Surplus Notes

The junior surplus notes, with a par value of $369,315 and $370,237 at March 31, 2018 and December 31, 2017, respectively, are reported in long-term debt on the Consolidated Balance Sheets and have a scheduled maturity of June 7, 2020, subject to the following restrictions. Pursuant to the Second Amended Plan of Rehabilitation, Ambac Assurance became the obligor under the junior surplus notes (previously issued by the Segregated Account) as of February 12, 2018. Principal and interest payments on these junior surplus notes cannot be made until all Ambac Assurance surplus notes (other than junior surplus notes) are paid in full and after all of Ambac Assurance's future and existing senior indebtedness, policy and other priority claims have been paid in full. All payments of principal and interest on these junior surplus notes are subject to the prior approval of the OCI. If the OCI does not approve the payment of interest on the junior surplus notes, such interest will accrue and compound annually until paid. No such approval has been sought or obtained to pay interest on junior surplus notes since their issuance.

• Par value at March 31, 2018 and December 31, 2017 includes $19,315 and $20,237, respectively, of junior surplus notes issued in connection with a settlement agreement (the “OSS Settlement Agreement”) entered into among Ambac, Ambac Assurance, the Segregated Account and One State Street, LLC (“OSS”) with respect to the termination of Ambac’s office lease with OSS. Part of these junior surplus notes ($13,056 par value) are reduced periodically as rent payments under the replacement lease (beginning in January 2016) are made by Ambac Assurance. Par value of these junior surplus notes was reduced by $922 and $977 during the three months ended March 31, 2018 and the three months ended March 31, 2017, respectively, as rent payments were made by Ambac Assurance. These junior surplus notes were recorded at their fair value at the date of issuance. The discount on these notes are currently being accreted into income using the effective interest method at an imputed interest rate of 19.5%.

• Par value at March 31, 2018 and December 31, 2017 includes $350,000 face amount of a junior surplus note originally issued to Ambac pursuant to Ambac's Reorganization Plan in accordance with the Mediation Agreement dated September 21, 2011 among Ambac, Ambac Assurance, the Segregated Account, the Rehabilitator, the OCI and the Official Committee of Unsecured Creditors of Ambac, and that Ambac sold to a Trust on August 28, 2014. This junior surplus note was recorded at a discount to par based on its fair value on August 28, 2014. Ambac is accreting the discount on this junior surplus note into earnings using the effective interest method, based on an imputed interest rate of 8.4% .

Ambac Note

The Ambac Note, issued in connection with the Rehabilitation Exit Transactions on February 12, 2018, as more fully described in Note 1. Background and Business Description, with a par value of $2,154,351 at March 31, 2018, is reported in long-term debt on the Consolidated Balance Sheets and have a legal maturity of February 12, 2023. Interest on the Ambac Note is payable quarterly (on the last day of each quarter beginning with June 30, 2018) at an annual rate of 3-month U.S. Dollar LIBOR + 5.00%, subject to a 1.00% LIBOR floor. The maturity date for the Ambac Note will be the earlier of (x) February 12, 2023, and (y) if the Secured Notes are then outstanding, the date that is five business days prior to the date for which OCI has approved the repayment of the outstanding principal amount of the surplus notes (other than junior surplus notes) issued by Ambac Assurance. Promptly, and in any event within four business days after the receipt (whether directly or indirectly) of any representation and warranty subrogation recoveries, Ambac Assurance shall (i) apply an amount (the “Mandatory Redemption Amount”) equal to the lesser of (a) the amount of such representation and warranty subrogation recoveries and (b) all outstanding principal and accrued and unpaid interest on the Ambac Note to redeem the Ambac Note, in whole or in part, as applicable; provided, that any non-cash representation and warranty subrogation recoveries shall be deemed to be received upon the receipt of the applicable appraisal.

The portion of the Ambac Note issued in connection with the exchange of surplus notes ("Ambac Note A") was accounted for as a debt modification since the creditors before and after the exchange remained the same and the change in terms was not considered substantial. A substantial change is considered to be a change in cash flows of equal to or greater than 10%, and because the change in cash flows was less than 10%, debt modification accounting is appropriate. Under debt modification accounting, Ambac Note A was recorded at a discount to par based on the carrying value of the surplus notes less the cash consideration paid. Furthermore, no gain or loss was recorded on the surplus note exchange and a new effective interest rate was established based on the cash flows of Ambac Note A. Any consideration paid directly related to the issuance of Ambac Note A is expensed as incurred. The portion of the Ambac Note issued in connection with the exchange of Deferred Amounts ("Ambac Note B") was recorded at fair value. The Deferred Amount exchange was accounted for as an extinguishment of the Deferred Amounts with the gain reflected as a benefit to loss and loss expenses. Any consideration paid directly related to the issuance of

| Ambac Financial Group, Inc. 442018 First Quarter FORM 10-Q |

Ambac Note B is capitalized and amortized as part of the effective yield calculation. The aggregate discount on the entire Ambac Note (portions A and B) is being accreted into earnings using the effective interest method, based on an imputed interest rate of 7.6%.

Tier 2 Notes

The Tier 2 Notes, issued in connection with the Rehabilitation Exit Transactions on February 12, 2018, with a par value of $242,777 (including paid-in-kind interest of $2,777) at March 31, 2018, are reported in long-term debt on the Consolidated Balance Sheets and have a legal maturity of February 12, 2055. Interest on the Tier 2 Notes is at an annual rate of 8.50%. Interest payments will not be made in cash on interest payment dates and shall be paid-in-kind and compounded on the last day of each calendar quarter, unless (i) funds are available to make such payments in cash as a result of receiving recoveries in respect of the representation and warranty subrogation recoveries in excess of $1,600,000 or (ii) interest is paid in cash on surplus notes (other than in connection with the Rehabilitation Exit Transactions). The Tier 2 Notes may not be redeemed or repaid prior to December 17, 2020 unless Ambac Assurance pays a make-whole premium. Thereafter, the Tier 2 Notes may be redeemed, in whole or in part, at the option of Ambac Assurance, at a price equal to 100% of the aggregate principal amount redeemed, plus accrued and unpaid interest, if any. The Tier 2 Notes were recorded at a discount to par as any consideration paid that was directly related to the issuance of the Tier 2 Notes was capitalized and is part of the effective yield calculation. Ambac is accreting the discount on the Tier 2 Notes into earnings using the effective interest method, based on an imputed interest rate of 9.9%.

Secured Borrowing

The secured borrowing, with a par value of $65,196 and $73,993 at March 31, 2018 and December 31, 2017, respectively, is reported in long-term debt on the Consolidated Balance Sheets and has a legal maturity of July 25, 2047. Interest on the secured borrowing is payable monthly at an annual rate of one month U.S. Dollar LIBOR + 2.8%. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities for further discussion on the secured borrowing transaction.

Variable Interest Entities, Long-term Debt

The variable interest entity notes were issued by consolidated VIEs. Ambac is the primary beneficiary of the VIEs as a result of providing financial guarantees on certain of the the variable interest obligations. Consequently, Ambac has consolidated these variable interest entity notes and all other assets and liabilities of the VIEs. Ambac is not primarily liable for the debt obligations of these entities. Ambac would only be required to make payments on these debt obligations in the event that the issuer defaults on any principal or interest due and to the extent such obligations are guaranteed by Ambac. The total unpaid principal amount of outstanding long-term debt associated with VIEs consolidated as a result of the financial guarantee provided by Ambac was $9,679,441 and $9,387,884 as of March 31, 2018 and December 31, 2017, respectively. The range of final maturity dates of the outstanding long-term debt associated with these VIEs is November 2018 to December 2047 as of March 31, 2018 and 2017. As of March 31, 2018 and December 31, 2017, the interest rates on these VIEs’ long-term debt ranged from 1.04% to 8.35% and from 0.96% to 8.35%, respectively. Final maturities of VIE long-term debt for each of the five years following March 31, 2018 are as follows: 2019-$295,651; 2020-$44,100; 2021-$94,024; 2022-$0; 2023-$0.

11. INCOME TAXES

Ambac files a consolidated Federal income tax return with its subsidiaries. Ambac and its subsidiaries also file separate or combined income tax returns in various states, local and foreign jurisdictions. The following are the major jurisdictions in which Ambac and its subsidiaries operate and the earliest tax years subject to examination:

Jurisdiction	Tax Year
United States	2010
New York State	2013
New York City	2013
United Kingdom	2014
Italy	2013

As of March 31, 2018 Ambac had U.S. federal ordinary net loss carryforwards totaling approximately $3,279,491, which, if not utilized, will begin expiring in 2029, and will fully expire in 2032.

| Ambac Financial Group, Inc. 452018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

The tax effects of temporary differences that give rise to significant portions of the deferred tax liabilities and deferred tax assets at March 31, 2018 and December 31, 2017 are presented below:

	March 31, 2018			December 31, 2017
Deferred tax liabilities:
Insurance intangible	$	174,938		$	177,864
Debentures	53,274			28,387
Unearned premiums and credit fees	50,569			51,485
Variable interest entities	23,221			22,817
Investments	19,003			28,798
Other	11,722			9,402
Total deferred tax liabilities	332,727			318,753
Deferred tax assets:
Net operating loss and capital carryforward	688,693			775,917
Loss reserves	298,888			264,624
Compensation	6,819			5,585
Other	1,819			2,140
Subtotal deferred tax assets	996,219			1,048,266
Valuation allowance	698,296			763,172
Total deferred tax assets	297,923			285,094
Net deferred tax (liability)	$	(34,804	)	$	(33,659	)

In accordance with the Income Tax Topic of the ASC, a valuation allowance is recognized if, based on the weight of available evidence, it is more-likely-than-not that some, or all, of the deferred tax asset will not be realized. As a result of the risks and uncertainties associated with future operating results, management believes it is more likely than not that the Company will not generate sufficient U.S. federal taxable income to recover the deferred tax operating asset and therefore has a full valuation allowance.

In accordance with SEC issued guidance (SAB 118), which provides a one-year measurement period for companies to finalize the accounting for the impact of the TCJA, Ambac continues to record the income tax effect of provisions related to international and executive compensation as estimates.

U.S. and foreign components of pre-tax income were as follows:

	Three Months Ended March 31,
	2018		2017
U.S.	$	297,741	$	(191,872	)
Foreign	10,568		86,012
Total	$	308,309	$	(105,860	)

The components of the provision for income taxes were as follows:

	Three Months Ended March 31,
	2018			2017
Current taxes
U. S. federal	$	—		$	—
U.S. state and local	1,037			320
Foreign	(39		)	19,261
Current taxes	998			19,581
Deferred taxes
Foreign	1,607			—
Provision for income taxes	$	2,605		$	19,581

| Ambac Financial Group, Inc. 462018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

NOL Usage

Pursuant to the intercompany tax sharing agreement, to the extent Ambac Assurance generates taxable income after September 30, 2011, which is offset with "Allocated NOLs" of $3,650,000, it is obligated to make payments (“Tolling Payments”), subject to certain credits, to Ambac in accordance with the following NOL usage table, where the “Applicable Percentage” is applied to the aggregate amount of federal income tax liability that would have been paid if the Allocated NOLs were not available. Pursuant to the Closing Agreement between Ambac and the Internal Revenue Service ("IRS"), the IRS will receive 12.5% of Tier C and 17.5% of Tier D payments, if made.

NOL Usage Table

NOL Usage Tier	Allocated NOLs			Applicable Percentage
A	The first	$479,000		15%
B	The next	$1,057,000	after Tier A	40%
C	The next	$1,057,000	after Tier B	10%
D	The next	$1,057,000	after Tier C	15%

For the three months ended March 31, 2018, Ambac Assurance generated $406,232 of taxable income, utilizing the remaining $168,205 balance of the $1,057,000 allocated Tier B NOL, and resulting in additional accrued Tolling Payments, net of applicable credits, of $14,129, which, assuming Ambac Assurance's cumulative full year 2018 taxable income does not fall below $168,205, will be paid to Ambac before the end of May of 2019. In addition, Ambac Assurance utilized $238,026 of Tier C NOL, which was applied against the $5,000 Tier C credit. Ambac Assurance will need to generate additional taxable income of $69 to offset the remaining balance of the $5,000 Tier C credit, at which point additional cumulative income will begin to accrue additional tolling payments to Ambac until all the of $3,650,000 Allocated Ambac Assurance NOLs have been utilized, expire, or otherwise become unavailable.

Beginning on the fifth anniversary date subsequent to Ambac's May 1, 2013 emergence from bankruptcy, and subject to Ambac's consent, not to be unreasonably withheld, to the extent Ambac Assurance generates post-determination date income in excess of the $3,650,000 Allocated NOLs, Ambac Assurance may utilize Ambac's then remaining NOLs in exchange for a payment of 25% of the federal income tax liability that Ambac Assurance would have paid had Ambac's NOLs not been available. After Ambac fully utilizes its Allocated NOLs it may utilize Ambac Assurance's then remaining Allocated NOLs in exchange for a payment of 50% of the federal income tax liability that Ambac would have paid had Ambac Assurance's NOL not been available.

As of March 31, 2018, the remaining balance of the $3,279,491 NOL allocated to Ambac Assurance was $1,875,973. As of March 31, 2018 Ambac's NOL was $1,403,518.

12. COMMITMENTS AND CONTINGENCIES

The following commitments and contingencies provide an update of those discussed in Note 18: Commitments and Contingencies in the Notes to Consolidated Financial Statements included Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 2017, and should be read in conjunction with the complete descriptions provided in the aforementioned Form 10-K.

The Segregated Account and Wisconsin Rehabilitation Proceeding

On September 25, 2017, the Rehabilitator filed in the Rehabilitation Court a Motion to Further Amend The Plan of Rehabilitation Confirmed on January 24, 2011 To Facilitate An Exit from Rehabilitation. The evidentiary Confirmation Hearing was held on January 4, 2018, and continued on January 22, 2017. On January 22, 2018, the Rehabilitation Court entered an order (the "Confirmation Order") granting the Rehabilitator’s motion and confirming the Second Amended Plan of Rehabilitation, which became effective on February 12, 2018. Pursuant to the Confirmation Order, the Rehabilitation Court also ruled that, contrary to allegations made by certain parties to certain military housing litigations (the "MHPI Projects"), the Rehabilitation Court did not previously enter any order that could form the predicate for a claim of “Ambac Default” and confirmed Section 6.13 of the Second Amended Plan of Rehabilitation which, among other things, provided that any such default is deemed not to have existed or to be cured.

On January 25, 2018, the MHPI Projects submitted a letter to the Rehabilitation Court objecting to the Rehabilitator's interpretation of the injunction in Article 6.8 of the Second Amended Plan of Rehabilitation and requesting briefing on the issue and a conference with the Rehabilitation Court. On February 7, 2018, pursuant to the request of the Rehabilitator, the Rehabilitation Court issued an order denying the request for briefing and a conference and overruled the objection set forth in the letter of January 25th. On February 7, 2018, the Rehabilitator filed a motion with the Rehabilitation Court requesting injunctive relief against the MHPI Projects that would, among other things, enjoin the MHPI Projects from taking further actions or making further arguments, in any court or otherwise, in contravention of the Confirmation Order, the findings contained in the Confirmation Order or the provisions of the Second Amended Plan of Rehabilitation. On the same day, the Rehabilitation Court issued an order granting the Rehabilitator's February 7th motion (the "February 7 Order"). On February 26, 2018, the MHPI Projects filed a Notice of Motion and Motion for Reconsideration as well as a Notice of Motion and Motion for Expedited Hearing in the Rehabilitation Court, requesting reconsideration of the February 7th Order on an expedited basis. Briefing on the motions was completed on April 5, 2018, and a hearing has been scheduled for May 10, 2018. On May 4, 2018, the Rehabilitator filed in the Rehabilitation Court a Motion to Dissolve the Injunction dated

| Ambac Financial Group, Inc. 472018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

February 7, 2018 and Amend Confirmation Order and a Motion for Final Decree and Order Discharging the Rehabilitator. In the former motion, the Rehabilitator requested the Rehabilitation Court to dissolve the injunction put in place under the February 7 Order and to amend the Confirmation Order, and thereby amend Section 6.13 of the Second Amended Plan of Rehabilitation, to limit the application of Section 6.13 to defaults or alleged defaults related to policies formerly allocated to the Segregated Account. The Rehabilitator also requested in the May 4, 2018 filings that the Rehabilitation Court remove the May 10, 2018 hearing from its calendar and enter a final decree and order closing the case and discharging the Rehabilitator and the Special Deputy Commissioner. On May 9, 2018, Ambac Assurance submitted a letter to the Rehabilitation Court to withdraw its brief in objection to the MHPI Projects’ Motion for Reconsideration of the February 7 Order and to request a briefing schedule with respect to the motions filed by OCI on May 4, 2018.

On March 2, 2018, the MHPI Projects noticed their appeal from the Confirmation Order and both of the orders issued by the Rehabilitation Court on February 7, 2018. On March 6, 2018, the MHPI Projects filed in the Rehabilitation Court a Notice of Motion and Motion for Stay Pending Appeal. On March 9, 2018, the MHPI Projects filed in the Wisconsin Court of Appeals a Motion for Ex Parte Relief Pending Appeal and Relief Pending Appeal. After accelerated briefing, the Court of Appeals granted the MHPI Projects’ Motion for Relief Pending Appeal on March 13, 2018 and stayed enforcement of the Rehabilitation Court’s February 7th Order and enforcement of Articles 6.8 and 6.13 of the Second Amended Plan of Rehabilitation, including but not limited to the extent that those Articles affect arguments that the MHPI Projects may make in any court. The Court of Appeals has not yet received the record of the proceedings before the Rehabilitation Court, and there is not yet a briefing schedule in the Court of Appeals relating to the MHPI Projects’ appeal.

Litigation Against Ambac

Ambac Assurance is defending several lawsuits in which borrowers have brought declaratory judgment actions claiming, among other things, that Ambac Assurance’s claims for specific performance related to the construction and development of housing at various military bases to replace or cash-fund a debt-service-reserve surety bond, as required under the applicable loan documents (see Litigation Filed By Ambac), are time-barred or are barred by the doctrine of laches, that Ambac lacks standing on the basis that there has been an “Ambac Default,” and that Ambac is not entitled to specific performance pursuant to the terms of the loan documents. Ambac Assurance is a defendant in various lawsuits, including the following:

• Meade Communities LLC v. Ambac Assurance Corporation (Circuit Court, Anne Arundel County, Maryland, Case No. C-02-CV-15-003745). On January 22, 2018, the court granted Meade's motion for summary judgment finding that Ambac Assurance lacked standing on the basis that there had been an "Ambac Default" by virtue of certain orders of the Rehabilitation Court. On January 26, 2018, Ambac Assurance filed a Motion to Alter or Amend Judgment with the Maryland Court arguing that the Rehabilitation Court's January 22 Confirmation Order constituted grounds for altering the judgment to award summary judgment on the "Ambac Default" issue for Ambac Assurance. On February 7, 2018, the Rehabilitation Court entered a further order enjoining Meade from continuing to argue that an Ambac Default occurred by virtue of the Rehabilitation Court's prior orders and requiring Meade to file that order with the Maryland Court. On February 8, 2018, Meade complied and filed the January 22nd and February 7th Rehabilitation Court orders with the Maryland court. On February 12, 2018, the Maryland Court granted Ambac Assurance's motion to stay enforcement of the Court's January 22nd amended order concerning "Ambac Default" and granting Meade an extension until March 14, 2018 to oppose Ambac Assurance's Motion to Alter or Amend Judgment. On March 14, 2018, Meade filed its opposition brief. The motion has not yet been decided.

• Monterey Bay Military Housing, LLC, et al. v. Ambac Assurance Corporation, et al. (United States District Court, Northern District of California, San Jose Division, Case No. 17-cv-04992-BLF, filed August 28, 2017). Plaintiffs filed an amended complaint on October 27, 2017. Ambac Assurance and the other defendants filed motions to dismiss the amended complaint on November 13, 2017, which Plaintiffs opposed on December 15, 2017. The motions are fully briefed and the court heard oral argument on April 12, 2018. No decision has been issued.

It is not reasonably possible to predict whether additional suits will be filed or whether additional inquiries or requests for information will be made, and it is also not possible to predict the outcome of litigation, inquiries or requests for information. It is possible that there could be unfavorable outcomes in these or other proceedings. Legal accruals for litigation against Ambac which are probable and reasonably estimable, and management's estimated range of loss for such matters, are not material to the operating results or financial position of the Company. For the litigation matters Ambac is defending that do not meet the “probable and reasonably estimable” accrual threshold and where no loss estimates have been provided above, management is unable to make a meaningful estimate of the amount or range of loss that could result from unfavorable outcomes. Under some circumstances, adverse results in any such proceedings could be material to our business, operations, financial position, profitability or cash flows. The Company believes that it has substantial defenses to the claims above and, to the extent that these actions proceed, the Company intends to defend itself vigorously; however, the Company is not able to predict the outcomes of these actions.

Litigation Filed or Joined by Ambac

In the ordinary course of their businesses, certain of Ambac’s subsidiaries assert claims in legal proceedings against third parties to recover losses already paid and/or mitigate future losses. The amounts recovered and/or losses avoided which may result from these proceedings is uncertain, although recoveries and/or losses avoided in any one or more of these proceedings during any quarter or fiscal year could be material to Ambac’s results of operations in that quarter or fiscal year.

| Ambac Financial Group, Inc. 482018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

Nat’l Collegiate Master Student Loan Trust v. Pa. Higher Education Assistance Agency (PHEAA) (Delaware Court of Chancery, C.A. No. 12111-VCS, filed March 21, 2016).   On January 12, 2018, Plaintiffs filed a motion for injunctive or declaratory relief requiring WTC, as Owner Trustee, and GSS Data Services, Inc., as Administrator, to resume processing for payment bills submitted by lawyers purporting to act on the Trusts’ behalf.  Oppositions to Plaintiffs’ motion were filed by Ambac and others on March 1, 2018.  Plaintiffs filed a reply brief in further support of their motion on March 16, 2018. At a hearing on April 3, 2018, the court denied Plaintiffs’ motion without prejudice. The court later entered an order memorializing its oral ruling on April 16, 2018. The court also granted Ambac’s motion to intervene on April 10, 2018 and Ambac filed its complaint in intervention on April 16, 2018.

Ambac Assurance Corporation v. Puerto Rico, et al. (United States District Court, District of Puerto Rico, No. 1:17-ap-00159, filed June 8, 2017). On July 28, 2017, Defendants moved to dismiss Ambac Assurance’s complaint; briefing on the motion to dismiss concluded on October 31, 2017, and oral argument on the motion was held on November 21, 2017. On February 27, 2018, the court granted Defendants’ motion to dismiss. As to certain of the claims, the court found that it lacks subject matter jurisdiction (i) to the extent the claims seek to invalidate the certification of the FEGP and prohibit certain actions under PROMESA due to alleged non-compliance with PROMESA requirements that are predicates to certification of the FEGP, or (ii) to the extent Ambac Assurance sought a determination of its lien rights over the PRHTA reserve accounts. As to other claims, the court found that Ambac Assurance had failed to state a claim upon which the court could grant relief, including that (i) as to constitutional issues, Ambac Assurance had failed to plead facts sufficient to allow the court to draw a reasonable inference that the Moratorium Legislation, Moratorium Orders, and Fiscal Plan Compliance Act were “unreasonable or unnecessary to effectuate an important government purpose” and had failed to allege plausibly that the FEGP is an exercise of Commonwealth legislative power, (ii) Ambac Assurance had failed to plead facts sufficient to show that the Moratorium Legislation and Moratorium Orders prohibited the payment of principal and interest or purported to bind creditors to any reduction of the outstanding obligations and therefore would have been preempted by PROMESA under PROMESA Section 303(1), and Ambac Assurance failed to plead plausible, ripe claims that the Moratorium Orders are unlawful under PROMESA section 303(3), (iii) the automatic stay is currently in effect and renders unavailable any cause of action pursuant to Section 407 of PROMESA, including claims by PRHTA bondholders that PRHTA should be compensated for any pledged special revenues transferred away from it in violation of applicable law, (iv) the court is not required or empowered under PROMESA or the Bankruptcy Code to order the payment of pledged special revenues to the PRHTA bondholders, and (v) Ambac Assurance had failed to plead facts sufficient to show that the PRHTA reserve accounts are the property of the bondholders. Finally, the court held that PROMESA section 305 prevented it from ordering any relief on Ambac’s claim that the PRHTA reserve accounts are held in trust for bondholders. On March 9, 2018, Ambac Assurance filed a notice of appeal to the First Circuit.

Official Committee of Unsecured Creditors v. Whyte (United States District Court, District of Puerto Rico, No. 1:17-ap-00257, filed September 8, 2017). Motions for summary judgment were filed on February 21, 2018; a hearing on the summary judgment motions was held on April 10, 2018. On February 26, 2018, the COFINA Agent moved to certify questions of law to the Supreme Court of Puerto Rico regarding COFINA’s constitutionality under the Puerto Rico Constitution. On April 3, 2018, Ambac Assurance filed an opposition to the motion to certify and, in the alternative, a cross-motion to certify alternative questions to the Supreme Court of Puerto Rico. Briefing on the motion to certify concluded on April 18, 2018; a hearing on the motion to certify is scheduled for May 9, 2018.

Ambac Assurance has filed various lawsuits seeking specific performance of obligations of borrowers on loans related to the construction and development of housing at various military bases to replace or cash-fund a debt-service-reserve surety bond provided by Ambac Assurance, as required under the applicable loan documents. Ambac Assurance has filed various lawsuits, including the following:

• Ambac Assurance Corporation v. Fort Bliss/White Sands Missile Range Housing LP (District Court, El Paso County, Texas, Cause No. 2016DCV0094). On February 7, 2018, the Rehabilitation Court entered a further order enjoining Bliss (among others) from continuing to argue that an Ambac Default occurred by virtue of the Rehabilitation Court's prior orders and requiring Bliss to file that order with the Texas Court. On February 8, 2018, Bliss filed the Rehabilitation Court's January 22 and February 7 orders with the Texas court. On March 13, 2018, the Wisconsin Court of Appeals entered an order that, among other things, stayed the Rehabilitation Court's February 7, 2018 injunction. On April 27, 2018, the court held argument on the cross-motions for summary judgment and took the matter under advisement, with no ruling issued from the bench.

In connection with Ambac Assurance’s efforts to seek redress for breaches of representations and warranties and fraud related to the information provided by both the underwriters and the sponsors of various residential mortgage-backed securities transactions and for failure to comply with the obligation by the sponsors to repurchase ineligible loans, Ambac Assurance has filed various lawsuits, including the following:

• Ambac Assurance Corporation and The Segregated Account of Ambac Assurance Corporation v. Countrywide Securities Corp., Countrywide Financial Corp. (a.k.a. Bank of America Home Loans) and Bank of America Corp. (Supreme Court of the State of New York, County of New York, Case No. 651612/2010, filed on September 28, 2010). On May 1, 2015, Ambac Assurance filed motions for partial summary judgment, which defendants opposed. Defendants also each filed motions for summary judgment, which Ambac Assurance opposed. On October 27, 2015, the court issued a decision dated October 22, 2015 granting in part and denying in part the parties’ respective summary judgment motions regarding Ambac Assurance’s claims against Countrywide (primary-liability claims), and issued a second decision granting Ambac Assurance’s partial motion for summary judgment and denying Bank of America’s motion for summary judgment regarding Ambac Assurance’s secondary-liability claims against Bank of America. Ambac Assurance and Countrywide filed notices of appeal of the October 22, 2015 decision relating to primary liability and Bank of America filed a notice of appeal of the October 27, 2015 decision relating

| Ambac Financial Group, Inc. 492018 First Quarter FORM 10-Q |

AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES

Notes to Unaudited Consolidated Financial Statements

(Dollar Amounts in Thousands, Except Share Amounts)

to its secondary-liability to the New York Appellate Division, First Department. On May 16, 2017, the First Department issued rulings in both appeals, reversing a number of rulings that the trial court had made and affirming other rulings. On June 15, 2017, Ambac Assurance filed a motion with the First Department for leave to appeal certain rulings in the May 16, 2017 decision to the Court of Appeals, which Countrywide opposed. On July 25, 2017 the First Department granted Ambac Assurance’s motion. The briefing for the appeal has been completed and oral argument is scheduled for June 6, 2018.

• The Segregated Account of Ambac Assurance Corporation and Ambac Assurance Corporation v. Countrywide Home Loans, Inc. (Wisconsin Circuit Court for Dane County, Case No 14 CV 3511, filed on December 30, 2014). On June 23, 2016, the Wisconsin Court of Appeals reversed the trial court’s prior dismissal of the complaint, and on October 11, 2016, the Wisconsin Supreme Court granted Countrywide’s petition for review of the June 23 decision by the Wisconsin Court of Appeals. The Wisconsin Supreme Court appeal was argued on February 28, 2017. On June 30, 2017, the Wisconsin Supreme Court reversed the decision of the Wisconsin Court of Appeals and remanded the case to the Wisconsin Court of Appeals for further proceedings. On December 14, 2017, the Wisconsin Court of Appeals affirmed the trial court’s July 2, 2015 decision dismissing the case for lack of personal jurisdiction. On January 16, 2018, Ambac Assurance filed a petition with the Supreme Court of Wisconsin for review of the December 14, 2017 decision. On January 30, 2018, Countrywide opposed the petition. On March 13, 2018, the Wisconsin Supreme Court denied Ambac Assurance’s petition for review, ending the Wisconsin Action. In the 2015 New York Action, on September 20, 2016, the New York Court granted Ambac Assurance’s motion to stay, holding Countrywide’s motion to dismiss the complaint in abeyance pending resolution of the Wisconsin Action. On March 30, 2018, the court vacated its stay of the 2015 New York Action, and the parties submitted supplemental letter briefs on April 11, 2018 addressing newly-issued authority relevant to Countrywide’s pending motion to dismiss, which was restored to the calendar.

• Ambac Assurance Corporation and The Segregated Account of Ambac Assurance Corporation v. U.S. Bank National Association (United States District Court, Southern District of New York, Docket No. 17-cv-00446 (SHS), filed January 20, 2017). On December 6, 2017, the court granted U.S. Bank’s motion for reconsideration and granted U.S. Bank’s motion to dismiss, and on January 18, 2018, the court issued an opinion memorializing the reasons for its decision. Ambac did not appeal that decision, and judgment was entered on March 5, 2018. On March 6, 2017, U.S. Bank filed a trust instruction proceeding in Minnesota state court concerning the proposed settlement, which is captioned, In the matter of HarborView Mortgage Loan Trust 2005-10, No. 27-TR-CV-17-32 (the “Minnesota Action”). On April 5, 2017, Ambac Assurance filed a motion to dismiss the Minnesota Action. On June 12, 2017, U.S. Bank filed an amended petition in the Minnesota Action, and on July 7, 2017 Ambac Assurance filed a renewed motion to dismiss, which U.S. Bank opposed. On November 13, 2017, the court denied the motion to dismiss the proceeding. On February 7, 2018, Ambac Assurance appealed this dismissal and U.S Bank opposed the appeal. Oral argument is scheduled for June 7, 2018. Additionally, certain certificateholders have objected or otherwise responded to the petition filed by U.S. Bank.

• Ambac Assurance Corporation v. U.S. Bank National Association (United States District Court, Southern District of New York, Docket No. 17-cv-02614, filed April 11, 2017). On September 15, 2017, U.S. Bank filed a motion to dismiss, which Ambac Assurance opposed on October 13, 2017. Oral argument on that motion was held on November 17, 2017. On March 12, 2018, Ambac Assurance filed an Amended Complaint removing the Segregated Account as a plaintiff. As a result, defendant agreed to withdraw certain arguments in support of its motion to dismiss. The remainder of the motion remains pending.

Item 2.     Management’s Discussion and Analysis of Financial Condition and Results of Operations

Following this summary is a discussion addressing the consolidated results of operations and financial condition of Ambac Financial Group, Inc. (“Ambac” or “the Company”) for the periods indicated. This discussion should be read in conjunction with Ambac’s Annual Report on Form 10-K for the year ended December 31, 2017, the CAUTIONARY STATEMENT PURSUANT TO THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 below and Risk Factors set forth in Part II, Item 1A of this Form 10-Q.

This Management’s Discussion and Analysis of Financial Condition and Results of Operations (“MD&A”) contains certain financial measures, in particular the presentation of Adjusted Earnings and Adjusted Book Value, which are not presented in accordance with U.S. generally accepted accounting principles (“GAAP”). We are presenting these non-GAAP financial measures because they provide greater transparency and enhanced visibility into the underlying drivers of our business. We do not intend for these non-GAAP financial measures to be a substitute for any GAAP financial measures and they may differ from similar reporting provided by other companies. Readers of this Form 10-

Q should use these non-GAAP financial measures only in conjunction with the comparable GAAP financial measures. Adjusted Earnings and Adjusted Book Value are non-GAAP financial measures that adjust for the impact of certain non-recurring or non-economic GAAP accounting requirements and include the addition of certain items that the Company has or expects to realize in the future, but that are not reported under GAAP. We provide reconciliations to the most directly comparable GAAP measures; Adjusted Earnings to Net income attributable to common stockholders and Adjusted Book Value to Total Ambac Financial Group, Inc. stockholders’ equity.

CAUTIONARY STATEMENT PURSUANT TO THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

Management has included in Parts I and II of this Quarterly Report on Form 10-Q, including this MD&A, statements that may constitute “forward-looking statements” within the meaning of the safe harbor provisions of the Private Securities Litigation Reform

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Act of 1995. Words such as “estimate,” “project,” “plan,” “believe,” “anticipate,” “intend,” “planned,” “potential” and similar expressions, or future or conditional verbs such as “will,” “should,” “would,” “could,” and “may,” or the negative of those expressions or verbs, identify forward-looking statements. We caution readers that these statements are not guarantees of future performance. Forward-looking statements are not historical facts but instead represent only our beliefs regarding future events, which may by their nature be inherently uncertain and some of which may be outside our control. These statements may relate to plans and objectives with respect to the future, among other things which may change. We are alerting you to the possibility that our actual results may differ, possibly materially, from the expected objectives or anticipated results that may be suggested, expressed or implied by these forward-looking statements. Important factors that could cause our results to differ, possibly materially, from those indicated in the forward-looking statements include, among others, those discussed under “Risk Factors” in Part I, Item 1A of the 2017 Annual Report on Form 10-K and in Part II, Item 1A of this quarterly Report on Form 10-Q.

Any or all of management’s forward-looking statements here or in other publications may turn out to be incorrect and are based on management’s current belief or opinions. Ambac’s actual results may vary materially, and there are no guarantees about the performance of Ambac’s securities. Among events, risks, uncertainties or factors that could cause actual results to differ materially are: (1) the highly speculative nature of Ambac’s common stock and volatility in the price of Ambac’s common stock; (2) uncertainty concerning the Company’s ability to achieve value for holders of its securities, whether from Ambac Assurance Corporation ("Ambac Assurance") or from transactions or opportunities apart from Ambac Assurance; (3) adverse effects on Ambac’s share price resulting from future offerings of debt or equity securities that rank senior to Ambac’s common stock; (4) potential of rehabilitation proceedings against Ambac Assurance; (5) dilution of current shareholder value or adverse effects on Ambac’s share price resulting from the issuance of additional shares of common stock; (6) inadequacy of reserves established for losses and loss expenses and possibility that changes in loss reserves may result in further volatility of earnings or financial results; (7) decisions made by Ambac Assurance's primary insurance regulator for the benefit of policyholders that may result in material adverse consequences for holders of the Company’s securities or holders of securities issued or insured by Ambac Assurance; (8) increased fiscal stress experienced by issuers of public finance obligations or an increased incidence of Chapter 9 filings or other restructuring proceedings by public finance issuers; (9) failure to recover claims paid on Puerto Rico exposures or incurrence of losses in amounts higher than expected; (10) the Company’s inability to realize the expected recoveries included in its financial statements; (11) changes in Ambac Assurance’s estimated representation and warranty recoveries or loss reserves over time; (12) insufficiency or unavailability of collateral to pay secured obligations; (13) credit risk throughout the Company’s business, including but not limited to credit risk related to residential mortgage-backed securities, student loan and other asset securitizations, public finance obligations and exposures to reinsurers; (14) credit risks related to large single risks, risk concentrations and correlated risks; (15) concentration and essentiality risk in connection with Military Housing insured debt; (16) the risk that the Company’s risk management policies and

practices do not anticipate certain risks and/or the magnitude of potential for loss; (17) risks associated with adverse selection as the Company’s insured portfolio runs off; (18) adverse effects on operating results or the Company’s financial position resulting from measures taken to reduce risks in its insured portfolio; (19) intercompany disputes or disputes with Ambac Assurance's primary insurance regulator; (20) our inability to mitigate or remediate losses, commute or reduce insured exposures or achieve recoveries or investment objectives, or the failure of any transaction intended to accomplish one or more of these objectives to deliver anticipated results; (21) the Company’s substantial indebtedness could adversely affect its financial condition and operating flexibility; (22) the Company may not be able to obtain financing or raise capital on acceptable terms or at all due to its substantial indebtedness and financial condition; (23) restrictive covenants in agreements and instruments may impair the Company’s ability to pursue or achieve its business strategies; (24) loss of control rights in transactions for which we provide insurance due to a finding that Ambac Assurance has defaulted, whether due to the Segregated Account rehabilitation proceedings or otherwise; (25) the Company’s results of operation may be adversely affected by events or circumstances that result in the accelerated amortization of the Company’s insurance intangible asset; (26) adverse tax consequences or other costs resulting from the Segregated Account rehabilitation plan, or from the characterization of the Company’s surplus notes or other obligations as equity; (27) risks attendant to the change in composition of securities in the Company’s investment portfolio; (28) changes in tax law; (29) changes in prevailing interest rates; (30) changes on inter-bank lending rate reporting practices or the method pursuant to which LIBOR rates are determined; (31) factors that may influence the amount of installment premiums paid to the Company, including the Segregated Account rehabilitation proceedings; (32) default by one or more of Ambac Assurance's portfolio investments, insured issuers or counterparties; (33) market risks impacting assets in the Company’s investment portfolio or the value of our assets posted as collateral in respect of interest rate swap transactions; (34) risks relating to determinations of amounts of impairments taken on investments; (35) the risk of litigation and regulatory inquiries or investigations, and the risk of adverse outcomes in connection therewith, which could have a material adverse effect on the Company’s business, operations, financial position, profitability or cash flows; (36) actions of stakeholders whose interests are not aligned with broader interests of the Company's stockholders; (37) the Company’s inability to realize value from Ambac UK or other subsidiaries of Ambac Assurance; (38) system security risks; (39) market spreads and pricing on interest rate derivative insured or issued by the Company; (40) the risk of volatility in income and earnings, including volatility due to the application of fair value accounting; (41) changes in accounting principles or practices that may impact the Company’s reported financial results; (42) legislative and regulatory developments, including intervention by regulatory authorities; (43) the economic impact of “Brexit” may have an adverse effect on the Company’s insured international portfolio and the value of its foreign investments, both of which primarily reside with its subsidiary Ambac UK; (44) operational risks, including with respect to internal processes, risk and investment models, systems and employees, and failures in services or products provided by third parties; (45) the Company’s financial position that may prompt departures of key employees and may impact the Company’s ability to attract qualified

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executives and employees; (46) implementation of new tax legislation signed into law on December 22, 2017 (commonly known as the “Tax Cuts and Jobs Act”) may have unexpected consequences for the Company and the value of its securities, particularly its common shares; (47) implementation of the Tax Cuts and Jobs Act may negatively impact the economic recovery of Puerto Rico, which could result in higher loss severities or an extended moratorium on debt service owed on Ambac Assurance-insured bonds of Puerto Rico and its instrumentalities; (48) implementation of the Tax Cuts and Jobs Act could have a negative impact on municipal issuers of Ambac-insured bonds; and (49) other risks and uncertainties that have not been identified at this time.

EXECUTIVE SUMMARY

Company Overview:

See Note 1. Background and Business Description to the Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q and Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for a description of the Company and our key strategic priorities to achieve our primary goal to maximize stockholder value.

Ambac Assurance and Subsidiaries:

A key strategy for Ambac is to increase the value of its investment in Ambac Assurance by actively managing its assets and liabilities. Asset management primarily entails maximizing the risk adjusted return on non-VIE invested assets and managing liquidity to help ensure resources are available to meet operational and strategic cash needs. These strategic cash needs include activities associated with Ambac's liability management and loss mitigation programs. Management evaluates the potential impact of loss mitigation and avoidance strategies in order to target and prioritize policies, or portions thereof, for commutation, refinancing, restructuring or other risk reduction or defeasance strategies.

Asset Management:

Investment portfolios are subject to internal investment guidelines, as well as limits on types and quality of investments imposed by applicable insurance laws and regulations. As part of its investment strategy, and in accordance with the aforementioned guidelines, Ambac Assurance and Ambac Assurance UK Limited ("Ambac UK"), a subsidiary of Ambac Assurance, purchase distressed Ambac-insured securities based on their relative risk/reward characteristics. The investment portfolios of Ambac Assurance and Ambac UK also hold fixed income securities and funds that include a variety of other assets including, but not limited to, corporate bonds, asset backed and mortgage backed securities, municipal bonds, high yield bonds, leveraged loans, equities, real estate, insurance-linked securities and hedge funds. Refer to Note 8. Investments to the Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q for further details of fixed income investments by asset class.

During the three months ended March 31, 2018, Ambac (inclusive of its subsidiaries) did not acquire a significant amount of distressed Ambac-insured securities. As a result of the Rehabilitation Exit Transactions, Ambac discharged all Deferred Amount obligations for an effective consideration package

comprised of cash, new Secured Notes and certain existing surplus notes, including those held by Ambac, and accordingly Ambac's ownership of Ambac-insured RMBS declined significantly. At March 31, 2018, Ambac owned $815.4 million Ambac-insured RMBS and approximately 29% of PRIFA and 58% of COFINA Ambac-insured bonds. Subject to applicable internal and regulatory guidelines and other constraints, Ambac will continue to opportunistically purchase Ambac-insured securities.

Liability and Insured Exposure Management:

Ambac Assurance's Risk Management Group focuses on the analysis, implementation and execution of commutations, risk reduction or defeasance and loss recovery strategies. Analysts evaluate the estimated timing and severity of projected policy claims as well as the potential impact of loss mitigation or remediation strategies in order to target and prioritize policies, or portions thereof, for commutation, refinancing, restructuring or other risk reduction or defeasance strategies. For targeted policies, analysts will engage with bondholders, issuers and other economic stakeholders to negotiate, structure and execute such strategies.

Ambac continued to proactively work with issuers to expedite refundings of Ambac-insured bonds. During the first quarter of 2018. Ambac Assurance negotiated with counterparties that resulted in the termination of several international RMBS transactions.

The following table provides a comparison of total and adversely classified credits ("ACC") net par outstanding in the insured portfolio at March 31, 2018 and December 31, 2017. Net par exposures within the U.S. public finance market includes capital appreciation bonds which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bonds.

($ in billions)	March 31, 2018		December 31, 2017		$ Variance			% Variance
Total	$	59.6	$	62.7	$	(3.1	)	(5	)%
ACC	12.6		14.1		(1.5		)	(10	)%

The overall reduction in total net par outstanding resulted from scheduled maturities, amortizations, refundings, refinancings and calls, including reductions as a result of the activities of Ambac and its subsidiaries as noted above.

The decrease in adversely classified credit exposures is primarily due to (i) paydowns or calls by issuers, mostly related to residential mortgage-backed securities and (ii) the upgrade of certain residential mortgage-backed securities.

Although our insured portfolio has generally performed satisfactorily in the first quarter of 2018, we continue to experience stress in certain sectors and insured exposures, particularly within our approximately $2.0 billion of exposure to Puerto Rico consisting of several different issuing entities (all below investment grade). Each issuing entity has its own credit risk profile attributable to discreet revenue sources, direct general obligation pledges and general obligation guarantees. Refer to Part 1, Item 1 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, for additional information regarding

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the different issuing entities that encompass Ambac's exposures to Puerto Rico.

Ambac:

As of March 31, 2018 total cash and investments of Ambac were $403.0 million, which include the following:

• Corporate securities and short-term securities of $274.1 million, (including $126.4 million of the secured notes issued by Ambac LSNI in connection with the Rehabilitation Exit Transactions)

• Ambac Assurance surplus notes with a fair value of $92.7 million, which are eliminated in consolidation

• Residual equity interest in the Corolla Trust that was created in 2014 to monetize Ambac's ownership interest in junior surplus notes issued by the Segregated Account. Ambac carries this interest using the equity method with a current value of $36.2 million at March 31, 2018. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities to the Consolidated Financial Statements included in Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for more information on the Corolla Trust.

As a result of positive taxable income at Ambac Assurance in 2017, Ambac will receive approximately $30.5 million in tax tolling payments in May 2018. For the three months ended March 31, 2018, Ambac recognized taxable income and accordingly has accrued $14.1 million of tolling payments. There are no assurances that Ambac Assurance will be able to generate taxable income for the full year of 2018 and therefore make future tolling payments to Ambac, including the accrued amount.

Financial Statement Impact of Foreign Currency:

The impact of foreign currency as reported in Ambac's Consolidated Statement of Total Comprehensive Income for the three months ended March 31, 2018 included the following:

($ in millions)
Net income (1)	$	5.0
Gain on foreign currency translation	32.1
Unrealized (losses) on non-functional currency available-for-sale securities	(6.8		)
Impact on total comprehensive income (loss)	$	30.3

(1) A portion of Ambac UK's, and to a lesser extent Ambac Assurance's, assets and liabilities are denominated in currencies other than its functional currency and accordingly, we recognized net foreign currency transaction gains/(losses) as a result of changes to foreign currency rates through our Consolidated Statement of Total Comprehensive Income (Loss). Refer to Note 2. Basis of Presentation and Significant Accounting Policies to the Consolidated Financial Statements included in Part I, Item 1 in this Form 10-Q for further details on transaction gains and losses.

Future changes to currency rates may adversely affect our financial results. Refer to Part I, Item 3 "Quantitative and Qualitative Disclosures about Market Risk" for further information on the impact of future currency rate changes on Ambac's financial instruments.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

Ambac’s Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”), which require the use of material estimates and assumptions. For a discussion of Ambac’s critical accounting policies and estimates, see “Critical Accounting Policies and Estimates” in Part II, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in Ambac’s Annual Report on Form 10-K for the year ended December 31, 2017.

FINANCIAL GUARANTEES IN FORCE

Financial guarantee products were sold in three principal markets: U.S. public finance, U.S. structured finance and international finance. The following table provides a breakdown of guaranteed net par outstanding by market at March 31, 2018 and December 31, 2017. Net par exposures within the U.S. public finance market include capital appreciation bonds which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bonds. Guaranteed net par outstanding includes the exposures of policies insuring variable interest entities (“VIEs”) consolidated in accordance with the Consolidation Topic of the ASC, Consolidation. Guaranteed net par outstanding excludes the exposures of policies that insure bonds which have been refunded or pre-refunded:

($ in millions)	March 31, 2018		December 31, 2017
Public Finance (1) (2)	$	29,924	$	32,088
Structured Finance	12,662		13,816
International Finance	16,989		16,812
Total net par outstanding	$	59,575	$	62,716

(1) Includes $5,813 and $5,829 of Military Housing net par outstanding at March 31, 2018 and December 31, 2017, respectively.

(2) Includes $1,968 and $1,968 of Puerto Rico net par outstanding at March 31, 2018 and December 31, 2017, respectively. Components of Puerto Rico net par outstanding includes capital appreciation bonds which are reported at the par amount at the time of issuance of the related insurance policy as opposed to the current accreted value of the bonds.

Total net par outstanding decreased $3,141 million from December 31, 2017.

• Reductions in public finance net par outstanding included $1,766 million from calls of insured exposures, $2 million from refundings and pre-refundings of insured exposures and $396 million from scheduled paydown activity.

• Reductions in structured finance net par primarily were due to RMBS paydowns of $570 million and investor-owned utilities calls and paydowns of $493 million.

• Increases in international finance were primarily due to the impact of foreign exchange rates of $537 million primarily related to changes in the British Pound, partially offset by policy runoff including prepayments of investor-owned utility and mortgage-backed securities.

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Although insured net par outstanding has decreased during 2018, the size of the portfolio is significantly greater than the assets of Ambac. Accordingly, financial stress in the insured portfolio could have a material adverse effect on Ambac's financial condition and results of operations.

Exposure Currency

The table below shows the distribution by currency of Ambac Assurance’s insured exposure as of March 31, 2018:

Currency (Amounts in millions)	Net Par Amount Outstanding in Base Currency		Net Par Amount Outstanding in U.S. Dollars
U.S. Dollars	$	43,467	$	43,467
British Pounds	£	9,573	13,434
Euros	€	1,684	2,075
Australian Dollars	A$	779	599
Total			$	59,575

Ambac discloses its exposures by currency to help interested parties understand its insured book of business. These insured exposures do not represent the cash outflows that may result from such insurance policies.

Puerto Rico

For a full discussion of Ambac’s exposure to the Commonwealth of Puerto Rico and its instrumentalities across several different issuing entities, see in Part II, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Financial Guarantees in Force" included in Ambac’s Annual Report on Form 10-K for the year ended December 31, 2017.

Fiscal Plans

The Financial Oversight and Management Board for Puerto Rico ("Oversight Board') approved and certified the Fiscal Plans for the Commonwealth of Puerto Rico, the Puerto Rico Highways and Transportation Authority (“PRHTA”) and other instrumentalities during the 12th and 13th Oversight Board public meetings held on April 19, 2018 and April 20, 2018.

The certified Commonwealth Fiscal Plan uses a six-year horizon, projects a six-year decline in population of 11%, a GNP decline of 13.2% in fiscal year 2018 (which turns positive in subsequent years) and projects an accumulated surplus of $6.7 billion by the end of fiscal year 2023. However, the certified Commonwealth Fiscal Plan does not provide sufficient detail regarding its underlying assumptions and data, does not delineate expenses between essential and non-essential services, and does not define essential services. In addition, the certified Commonwealth Fiscal Plan does not project sufficient cashflows to fulfill contractual debt service payments, leaving uncertainty about the Commonwealth’s future obligations. If the certified Commonwealth Fiscal Plan without meaningful changes, became the sole or primary measure for determining creditor outcomes, Ambac's financial condition, including liquidity, loss reserves and capital resources may suffer a materially negative impact.

Federal Aid

On April 10, 2018, the U.S. Department of Housing and Urban Development announced it was awarding Puerto Rico $8.3 billion in Community Development Block Grant – Disaster Recovery

(CDBG-DR) funding. This award is in addition to the $10.2 billion in outstanding CDBG-DR awards made available as a result of the Bipartisan Budget Act of 2018. The CDBG-DR grants support a variety of disaster relief activities in Puerto Rico as it recovers from hurricanes Maria and Irma, including housing redevelopment and rebuilding, business assistance, economic revitalization, and infrastructure repair. In addition to helping the people of Puerto Rico recover from the hurricanes, the impact of the CDBG-DR grants, other Federal aid, and insurance recoveries are expected to support economic recovery and, ultimately, economic growth and thereby potentially benefit creditor outcomes, including bonds insured by Ambac Assurance. However, there can be no assurances as to the certainty, timing or magnitude of benefits to creditor outcomes related to disaster aid and subsequent economic growth, if any.

Commonwealth Liquidity

On February 6, 2018, the Oversight Board announced that it retained Duff & Phelps, LLC to conduct an independent forensics analysis of the Commonwealth of Puerto Rico's government bank accounts. The Oversight Board stated it will make the findings of the investigation public. As of March 31, 2018, the balances of bank accounts for various Puerto Rico government entities and instrumentalities totaled $7.95 billion. However, it has been previously reported by the Puerto Rico Fiscal Agency and Financial Authority ("FAFAA") that much of this balance had restricted uses or was tied up in ongoing litigation. Consequently, this purported lack of access to a portion of these funds could exacerbate existing liquidity constraints of the Commonwealth and its instrumentalities for certain essential and non-essential services and further strain timelines and potential severities for creditors, including Ambac.

As of April 13, 2018, the Treasury Single Account cash position, as reported by the Puerto Rico Treasury Department, was $2.095 billion and above the $1.1 billion threshold to access FEMA Community Disaster Loan (CDL) financing.

Mediation

In a case status report filed by the Oversight Board on April 25, 2018, the Oversight Board noted that mediation efforts continue and are currently focused on resolution of the Commonwealth-COFINA dispute regarding ownership of sales and use taxes.

No assurances can be given that consensual resolutions will be achieved with respect to the Commonwealth’s or COFINA’s obligations or those of any other Puerto Rico instrumentality, or that any consensual resolutions will not be severe and cause Ambac to experience losses materially exceeding current reserves.

Summary

While management believes its reserves are adequate to cover losses in its Public Finance insured portfolio, there can be no assurance that Ambac may not incur additional losses in the future, particularly given the developing economic, political, and legal circumstances in Puerto Rico. Such additional losses may have a material adverse effect on Ambac’s results of operations and financial condition.

Ambac Post-Title III Litigation Update

Ambac Assurance is party to ten litigations related to its Puerto Rico exposures. Six of these litigations are stayed under Title III

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of PROMESA, and one has been stayed by order of the United States District Court for the District of Puerto Rico pending resolution of an interpleader action related to COFINA funds (to which interpleader action Ambac is also a party). Two of the three active litigations are proceeding as adversary proceedings under the Title III process before the United States District Court for the District of Puerto Rico; the remaining active litigation is on appeal before the United States Court of Appeals for the First Circuit. Accordingly, Ambac is unable to predict when and how the issues

raised in those cases will be resolved. If Ambac Assurance is unsuccessful with any of these challenges, Ambac’s financial condition, including liquidity, loss reserves and capital resources may suffer a material negative impact.

Refer to Note 12. Commitments and Contingencies to the Consolidated Financial Statements for further information about Ambac's litigation relating to Puerto Rico.

Exposure Concentrations within each Market

The table below shows Ambac’s ten largest U.S. public finance exposures, by repayment source, as a percentage of total financial guarantee net par outstanding at March 31, 2018:

($ in millions)	Ambac Ratings(1)	Net Par Outstanding		% of Total Net Par Outstanding
New Jersey Transportation Trust Fund Authority - Transportation System	BBB+	$	1,642	2.8	%
Puerto Rico Sales Tax Financing Corporation - Senior Sales Tax Revenue (COFINA)	BIG	805		1.4	%
Massachusetts Commonwealth - GO	AA	802		1.3	%
Mets Queens Baseball Stadium Project, NY, Lease Revenue	BBB	557		0.9	%
Hickam Community Housing LLC	BBB	472		0.8	%
Puerto Rico Infrastructure Financing Authority, Special Tax Revenue	BIG	438		0.7	%
Puerto Rico Highways & Transportation Authority, Transportation Revenue	BIG	433		0.7	%
Bragg Communities, LLC	A-	428		0.7	%
New Jersey Economic Development Authority - School Facilities Construction	BBB+	400		0.7	%
Chicago, IL - GO	BBB-	360		0.6	%
Total		$	6,337	10.6	%

(1) Internal credit ratings are provided solely to indicate the underlying credit quality of guaranteed obligations based on the view of Ambac Assurance. In cases where Ambac Assurance has insured multiple tranches of an issue with varying internal ratings, or more than one obligation of an issuer with varying internal ratings, a weighted average rating is used. Ambac Assurance credit ratings are subject to revision at any time and do not constitute investment advice. “BIG” denotes credits deemed below investment grade.

Net par related to the top ten U.S. public finance exposures reduced$89 million from December 31, 2017. Changes in these exposure amounts will occur due to scheduled paydowns, calls and refundings executed during the period. During 2018 there was no change in the listing of exposures included within the top ten U.S. public finance exposures.

The table below shows Ambac’s ten largest structured finance transactions, as a percentage of total financial guarantee net par outstanding at March 31, 2018:

($ in millions)	Bond Type	Ambac Rating(1)	Net Par Outstanding		% of Total Net Par Outstanding
Ballantyne Re Plc (2)	Structured Insurance	BIG	$	900	1.5	%
Progress Energy Carolinas, Inc.	Investor Owned Utility	A-	558		0.9	%
Wachovia Asset Securitization Issuance II, LLC 2007-HE2	Mortgage Backed Securities	BBB	526		0.9	%
Timberlake Financial, LLC	Structured Insurance	BBB	511		0.9	%
Wachovia Asset Securitization Issuance II, LLC 2007-HE1	Mortgage Backed Securities	BBB	367		0.6	%
Consolidated Edison Company of New York	Investor Owned Utility	A	347		0.6	%
Option One Mortgage Loan Trust 2007-FXD1	Mortgage Backed Securities	BIG	259		0.4	%
Niagara Mohawk Power Corporation	Investor Owned Utility	A	257		0.4	%
The National Collegiate Student Loan Trust 2007-4	Student Loan	BIG	229		0.4	%
Impac CMB Trust Series 2005-7	Mortgage Backed Securities	BIG	228		0.4	%
Total			$	4,182	7.0	%

(1) Internal credit ratings are provided solely to indicate the underlying credit quality of guaranteed obligations based on the view of Ambac Assurance, and for Ambac UK related transactions, based on the view of Ambac UK. In cases where Ambac Assurance or Ambac UK has insured multiple tranches of an issue with varying internal ratings, or more than one obligation of an issuer with varying internal ratings, a weighted average rating is used. Ambac

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Assurance and Ambac UK credit ratings are subject to revision at any time and do not constitute investment advice. “BIG” denotes credits deemed below investment grade.

(2) Insurance policy issued by Ambac UK.

Net par related to the top ten U.S. structured finance exposures reduced$148 million from December 31, 2017. The primary change in top U.S. structured finance exposures primarily relates to paydowns of RMBS during the three months ended March 31, 2018 in addition to prepayments on two investor owned utilities. During 2018, due to calls, CenterPoint Energy Inc. and Duke Energy Ohio, Inc. were removed from the top 10 largest U.S. structured finance exposures offset by the addition of The National Collegiate Student Loan Trust 2007-4 and Impac CMB Trust Series 2005-7.

The table below shows our ten largest international finance transactions as a percentage of total financial guarantee net par outstanding at March 31, 2018. Except where noted, all international finance transactions included in the table below are insured by Ambac UK:

($ in millions)	Country-Bond Type	Ambac Rating(1)	Net Par Outstanding		% of Total Net Par Outstanding
Mitchells & Butlers Finance plc-UK Pub Securitisation	UK-Asset Securitizations	A+	$	1,501	2.5	%
National Grid Electricity Transmission	UK-Utility	A-	1,181		2.0	%
Aspire Defence Finance plc	UK-Infrastructure	BBB+	953		1.6	%
Capital Hospitals plc (2)	UK-Infrastructure	A-	950		1.6	%
Posillipo Finance II S.r.l	Italy-Sub-Sovereign	BBB-	838		1.4	%
Anglian Water	UK-Utility	A-	830		1.4	%
Ostregion Investmentgesellschaft NR 1 SA (2)	Austria-Infrastructure	BIG	790		1.3	%
Telereal Securitisation plc	UK-Asset Securitizations	AA	782		1.3	%
National Grid Gas	UK-Utility	A-	766		1.3	%
RMPA Services plc	UK-Infrastructure	BBB+	636		1.1	%
Total			$	9,227	15.5	%

(1) Internal credit ratings are provided solely to indicate the underlying credit quality of guaranteed obligations based on the view of Ambac Assurance, and for Ambac UK related transactions, based on the view of Ambac UK. In cases where Ambac Assurance or Ambac UK has insured multiple tranches of an issue with varying internal ratings, or more than one obligation of an issuer with varying internal ratings, a weighted average rating is used. Ambac Assurance and Ambac UK credit ratings are subject to revision at any time and do not constitute investment advice. “BIG” denotes credits deemed below investment grade.

(2) Ambac Assurance has issued an insurance policy for this transaction that will only pay in the event that Ambac UK does not pay under its insurance policy.

Net par related to the top ten international finance exposures increased$268 million from December 31, 2017. International exposures are impacted by changes in foreign exchange rates, certain indexation rates and scheduled and unscheduled paydowns. As of March 31, 2018, there was no change in the listing of exposures included within the top ten international exposures although the exposure amounts have increased due to movements in foreign exchange rates and indexation rates.

The concentration of net par amongst the top categories noted above (as a percentage of net par outstanding) has increased since December 31, 2017. Given that Ambac has not written any new insurance policies since 2008, the risk exists that the insured portfolio becomes increasingly concentrated to large and/or below investment grade exposures.

Ratings Distribution

The following tables provide a rating distribution of net par outstanding based upon internal Ambac credit ratings⁽¹⁾ and a distribution by bond type of Ambac's below investment grade net par exposures at March 31, 2018 and December 31, 2017. Below investment grade is defined as those exposures with an Ambac internal credit rating below BBB-:

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Note: AAA is less than 1% in both periods.

(1) Internal credit ratings are provided solely to indicate the underlying credit quality of guaranteed obligations based on the view of Ambac Assurance, and for Ambac UK related transactions, based on the view of Ambac UK. In cases where Ambac Assurance or Ambac UK has insured multiple tranches of an issue with varying internal ratings, or more than one obligation of an issuer with varying internal ratings, a weighted average rating is used. Ambac Assurance and Ambac UK credit ratings are subject to revision at any time and do not constitute investment advice.

	Net Par Outstanding
Summary of Below Investment Grade Exposure ($ in millions)	March 31, 2018		December 31, 2017
Public Finance:
Lease and tax-backed (1)	$	2,138	$	2,144
General obligation (1)	488		491
Transportation	378		397
Housing (2)	316		317
Health care	23		24
Other	187		189
Total Public Finance	3,530		3,562
Structured Finance:
Residential mortgage-backed and home equity—first lien	3,750		3,947
Residential mortgage-backed and home equity—second lien	1,561		2,803
Student loans	902		922
Structured Insurance	900		900
Mortgage-backed and home equity—other	161		166
Other	—		9
Total Structured Finance	7,274		8,747
International Finance:
Other	1,194		1,200
Total International Finance	1,194		1,200
Total	$	11,998	$	13,509

(1) Lease and tax-backed revenue includes $1,802 of Puerto Rico net par at March 31, 2018 and December 31, 2017. General obligation includes $166 of Puerto Rico net par at March 31, 2018 and December 31, 2017. Components of Puerto Rico net par outstanding includes capital appreciation bonds which are reported at the par amount at the time of issuance of the related insurance policy as opposed to the current accreted value of the bonds.

(2) Relates to military housing net par.

The decrease in below investment grade exposures is primarily due to (i) the upgrade of certain residential mortgage-backed transactions and (ii) paydowns or calls by issuers, mostly related to residential mortgage-backed securities. Despite the decrease in below investment grade exposures, such exposures could increase as a relative proportion of the guarantee portfolio given that stressed borrowers generally have less ability to prepay or refinance their debt. Accordingly, due to these and other factors, it is not unreasonable to expect the proportion of below investment grade exposure in the guarantee portfolio to increase in the future.

RESULTS OF OPERATIONS

Net income in the first quarter of 2018 was $306 million compared to a net loss of $125 million in the first quarter of 2017. The first quarter 2018 net income as compared to the first quarter 2017 net loss was primarily driven by (i) a losses and loss expenses benefit as compared to losses and loss expenses in the first quarter of 2017, (ii) higher net investment income and (iii) net gains on interest rate derivatives compared to losses in the first quarter of 2017, partially offset by (i) lower net premiums earned and (ii) higher interest expenses.

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A summary of our financial results is shown below:

	Three Months Ended March 31,
($ in millions)	2018			2017
Revenues:
Net premiums earned	$	30.9		$	47.6
Net investment income	110.2			81.6
Net other-than-temporary impairment losses	(0.3		)	(3.9		)
Net realized investment gains (losses)	4.9			(4.9		)
Change in fair value of credit derivatives	(0.3		)	1.1
Net gains (losses) on interest rate derivatives	25.5			(1.5		)
Net realized gains (losses) on extinguishment of debt	3.1			2.7
Other income (expense)	(0.5		)	0.1
Income (loss) on variable interest entities	0.6			3.7
Expenses:
Losses and loss expenses (benefit)	(247.4		)	135.0
Insurance intangible amortization	28.6			37.5
Operating expenses	36.4			28.1
Interest expense	48.1			31.6
Provision for income taxes	2.6			19.6
Net income (loss) (attributable to common stockholders)	$	305.7		$	(125.4	)

The following paragraphs describe the consolidated results of operations of Ambac and its subsidiaries for the three months endedMarch 31, 2018 and 2017, respectively.

Rehabilitation Exit Transactions.On February 12, 2018, Ambac Assurance executed the following Rehabilitation Exit Transactions (as more fully discussed in Note 1. Background and Business Description to the Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q and in Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017):

• the Second Amended Plan of Rehabilitation became effective and a series of transactions were consummated which provided holders of beneficial interests in Deferred Amounts (other than Ambac, but including Ambac Assurance) a total effective consideration package, in full satisfaction and discharge of each $1.00 of Deferred Amounts (including accretion), of (i) $0.40 in cash, (ii) $0.41 in principal amount of new Secured Notes and (iii) $0.125 currently outstanding surplus notes (from certain holders of surplus notes). Such consideration package provided a discount of $0.065 (set first against accretion of Deferred Amounts). Ambac received $0.91 in principal amount of Secured Notes for each $1.00 of Deferred Amounts (including accretion) that it held, and provided a $0.09 discount in full satisfaction and discharge of its Deferred Amount claims. This transaction is being accounted for as an extinguishment of Deferred Amounts and the discount of approximately $288.2 million from the

settlement was reflected as a benefit to loss and loss expenses in the Consolidated Statements of Comprehensive Income (Loss) in the quarter ended March 31, 2018. In connection with these transactions, Ambac Assurance received $196.3 million of principal and accrued and unpaid interest on general account surplus notes. Ambac Assurance recognized a gain on the extinguishment of these surplus notes of $3.1 million.

• Exchanges were consummated, pursuant to which holders of surplus notes received the same effective package as holders of beneficial interests in Deferred Amounts, including the discount of $0.065 of each $1.00 of principal amount and accrued and unpaid interest on the surplus notes tendered. These exchanges resulted in Ambac Assurance's cancellation of $613.2 million of principal and accrued and unpaid interest of general account surplus notes. These exchanges were accounted for as a debt modification since the creditors before and after the discount remain the same and the change in the terms were not considered substantial. A substantial change is considered to be a change in cash flows of equal to or greater than 10% as a result of the modification of terms. As the change in cash flows is less than 10%, debt modification accounting is appropriate. Under debt modification accounting, no gain or loss is recorded, and a new effective interest rate is established based on the cash flows of the Ambac Note, which secures the Secured Notes issued. Additionally, any consideration paid that is directly related to the issuance of the Ambac Note is capitalized and amortized as part of the effective yield calculation.

• Ambac Assurance issued $240.0 million of new debt secured by certain of Ambac Assurance’s rights to representation and warranty subrogation recoveries above $1.6 billion ("Tier 2 Notes"). The proceeds received from this issuance were used to fund the cash portion of the consideration paid pursuant to the Second Amended Plan of Rehabilitation and exchanges noted above. Refer to Note 10. Long-term Debt to the Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q for further information regarding Ambac's debt obligations.

• Ambac incurred operating expenses in the first quarter of 2018 for its and the OCI's financial advisors of approximately $13.7 million.

In order to execute these transactions, Ambac established a special purpose entity, Ambac LSNI, LLC, for the sole purpose of the issuance of $2,154.3 million of Secured Notes, of which Ambac Assurance received $643.6 million and Ambac received $124.9 million. Ambac does not consolidate Ambac LSNI, LLC; therefore, the full amount of the debt is included in long term debt and Secured Notes held by Ambac and Ambac Assurance are included in invested assets on the consolidated balance sheet.

Net Premiums Earned. Net premiums earned primarily represent the amortization into income of insurance premiums. We present accelerated premiums, which result from calls and other accelerations of insured obligations separate from normal net premiums earned. When an insured bond has been retired, any remaining unearned premium revenue ("UPR") is recognized at that time to the extent the financial guarantee contract is legally extinguished, causing accelerated premium revenue. For

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installment premium paying transactions, we offset the recognition of any remaining UPR by the reduction of the related premium receivable to zero (as it will not be collected as a result of the retirement), which may cause negative accelerated premium revenue.

Net premiums earned decreased $16.7 million for the three months ended March 31, 2018 compared to the three months ended March 31, 2017. Normal net premiums earned and accelerated premiums are reconciled to total net premiums earned in the table below. The following table provides a breakdown of net premiums earned by market:

	Three Months Ended March 31,
($ in millions)	2018			2017
Normal Premium Earned:
Public finance	$	10.0		$	18.7
Structured finance	5.2			5.7
International finance	6.3			6.9
Total normal premiums earned	21.5			31.3
Accelerated Earnings:
Public finance	8.9			16.1
Structured Finance	0.6			0.2
International finance	(0.1		)	—
Accelerated earnings	9.4			16.3
Total net premiums earned	$	30.9		$	47.6

The decrease in normal premiums earned in the three months ended March 31, 2018 is primarily attributable to the continued runoff of the portfolio. Terminations and accelerations, including those which occurred in prior periods, result in lower normal premiums earned in current and future periods. Normal premiums are also impacted by the earnings of pre-refunded insured securities within Public Finance. Since the maturity date of pre-refunded securities is shortened (to a specified call date from its previous legal maturity), normal premiums earned will increase over the remaining period of the related policy as the existing unearned premiums will be earned in the period between the pre-refunding date and the specified call date. Structured Finance normal premiums earned were impacted by continued runoff of the portfolio, particularly within the RMBS sector. International Finance normal premiums earned were reduced in the three months ended March 31, 2018 as compared to the three months ended March 31, 2017 as a result of continued runoff of the portfolio, in particular a certain asset backed policy terminated in 2017 resulting in a reduction of premiums earned. This was partially offset by the strengthening of the British Pound.

The decrease in public finance accelerated earnings in the three months ended March 31, 2018 is primarily attributed to decreased call volume of municipal bonds. The increase in structured finance accelerated earnings in the three months ended March 31, 2018 is due to calls of certain investor-owned utility transactions during the three months ended March 31, 2018. International finance accelerated earnings in the three months ended March 31, 2018 is primarily due to the termination of certain residential mortgage-backed security transactions that resulted in a negative accelerated premiums.

Net Investment Income. Net investment income increased$28.6 million for the three months ended March 31, 2018 compared to the same period in the prior year. The increase reflects the higher yield for first quarter 2018, resulting from a greater allocation to Ambac-insured securities and the impact of the Rehabilitation Exit Transactions. Ambac-insured RMBS discount accretion accelerated with reprojected cash flows beginning in late 2017 through the consummation of the Rehabilitation Exit Transactions. Additionally, the three months ended March 31, 2018 includes income on other Ambac-insured securities acquired over the course of 2017, predominately Puerto Rico bonds. Partially offsetting these factors were the impact of a smaller portfolio of non-insured long-term fixed income securities resulting from cash payments on the Rehabilitation Exit Transactions and net losses of $1.6 million on trading securities compared net gains of $7.2 million in the first quarter of 2017. Trading losses in first quarter 2018 were driven primarily by negative equity market returns in funds held by Ambac UK combined with the impact of the stronger pound sterling.

As a result of cash payments made and the reduced balance of Ambac-insured RMBS resulting from the settlement of Deferred Amounts held in Ambac's investment portfolio upon consummation of the Rehabilitation Exit Transactions, Ambac's investment income is expected to be significantly lower in future periods beginning with the three months ending June 30, 2018.

Net Other-Than-Temporary Impairment Losses. Net other-than-temporary impairment losses recorded in earnings include only credit related impairment amounts to the extent management does not intend to sell and it is not more likely than not that the Company will be required to sell before recovery of the amortized cost basis. Non-credit related impairment amounts are recorded in other comprehensive income. Alternatively, non-credit related impairment is reported through earnings as part of net other-than-temporary impairment losses if management intends to sell securities or it is more likely than not that the Company will be required to sell before recovery of amortized cost less any current period credit impairment.

Net other-than-temporary impairments for the three month periods ended March 31, 2018 and 2017 included credit related impairments on certain securities and also included some losses due to management's intent to sell securities.

Net Realized Investment Gains (Losses).The following table provides a breakdown of net realized gains (losses) for the periods presented:

	Three Months Ended March 31,
($ in millions)	2018			2017
Net (losses) on securities sold or called	$	9.7		$	(6.8	)
Net foreign exchange gains (losses)	(4.8		)	1.9
Total net realized gains (losses)	$	4.9		$	(4.9	)

Change in Fair Value of Credit Derivatives. The loss from change in fair value of credit derivatives for the three months ended March 31, 2018 was $0.3 million, as compared to the gain of $1.1 million for the three months ended March 31, 2017. The loss for the three months ended March 31, 2018 was primarily due to a decline on

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reference obligation pricing on certain transaction within the portfolio. The gains for the three months ended March 31, 2017 were primarily due to improved reference obligation pricing on certain transactions and a stronger credit assessment of one transaction within the portfolio.

Realized gains and other settlements on credit derivative contracts represent premiums received and accrued on such contracts. Realized gains and other settlements were $0.1 million for the three months ended March 31, 2018 and $0.2 million for the three months ended March 31, 2017. Declining realized gains reflect the continued runoff of the portfolio.

Net Gain (Loss) on Interest Rate Derivatives. The interest rate derivatives portfolio is positioned to benefit from rising rates as a partial economic hedge against interest rate exposure in the financial guarantee portfolio. Results in Net gain (loss) on interest rate derivatives generally reflect mark-to-market gains (losses) in the portfolio caused by increases (declines) in forward interest rates during the periods, the carrying cost of the portfolio and the impact of the Ambac CVA and counterparty credit adjustments as discussed below.

Net gain (loss) on interest rate derivatives for the three months ended March 31, 2018 were $25.5 million compared to ($1.5) million for the three months ended March 31, 2017. The net gain for the three months ended March 31, 2018 reflects increases in interest rates with the resulting gains partially offset by a higher portfolio carry cost. The net loss for the three months ended March 31, 2017 reflects modest increases in interest rates with the resulting gains offset by the portfolio carry cost.

The fair value of derivatives include valuation adjustments to reflect Ambac’s own credit risk and counterparty credit risk when appropriate. Within the interest rate derivatives portfolio, an Ambac CVA is generally applicable for uncollateralized derivative liabilities that may not be offset by derivative assets under a master netting agreement. For the periods presented, an Ambac CVA was applicable only to the Augusta swaps that were terminated in June 2017. Counterparty credit adjustments are generally applicable for uncollateralized derivative assets that may not be offset by derivative liabilities under a master netting agreement. Inclusion of counterparty credit adjustments in the valuation of interest rate derivatives resulted in gains (losses) within Net gain (loss) on interest rate derivatives of $0.3 million for the three months ended March 31, 2018, compared to $1.6 for the three months ended March 31, 2017.

Net Realized Gains (Losses) on Extinguishment of Debt. Net realized gains on extinguishment of debt was $3.1 million for the three months ended March 31, 2018, compared to gains of $2.7 million for the three months ended March 31, 2017. The gains for the three months ended March 31, 2018 related to surplus notes received by Ambac Assurance in settlement of Deferred Amounts held in its investment portfolio under the Rehabilitation Exit Transactions. The gains for the three months ended March 31, 2017 included gains from the settlements of repurchased surplus notes below their carrying values.

Other Income (expense). The below table summarizes other income for the presented periods:

	Three Months Ended March 31,
($ in millions)	2018			2017
Foreign exchange gain/(loss)	$	(1.2	)	$	(0.6	)
Other	0.7			0.7
Total other income (expense)	$	(0.5	)	$	0.1

Foreign exchange gains/(losses) include gains/(losses) relating to foreign currency changes on the present value of premium receivables denominated in a subsidiary's non-functional currency in addition to foreign exchange gains/(losses) on cash. Other primarily includes consent and waiver fees in addition to non-service related postretirement activity.

Income (loss) on Variable Interest Entities. Included within Income (loss) on variable interest entities are income statement amounts relating to VIEs consolidated under the Consolidation Topic of the ASC as a result of Ambac's variable interest arising from financial guarantees written by Ambac's subsidiaries, including gains or losses attributable to consolidating or deconsolidating VIEs during the periods reported. Generally, the Company’s consolidated VIEs are entities for which Ambac has provided financial guarantees on all of or a portion of its assets or liabilities. In consolidation, assets and liabilities of the VIEs are reported at fair value and the related insurance assets and liabilities are eliminated. However, the amount of VIE net assets (liabilities) that remain in consolidation generally result from the net positive (negative) present value of projected cash flows from (to) the VIEs which are attributable to Ambac’s insurance subsidiaries in the form of financial guarantee insurance premiums, fees and losses. In the case of VIEs with net negative projected cash flows, the net liability is generally to be funded by Ambac’s insurance subsidiaries through insurance claim payments. Differences between the net carrying value of the insurance accounts under the Financial Services—Insurance Topic of the ASC and the carrying value of the consolidated VIE’s net assets or liabilities are recorded through income at the time of consolidation or deconsolidation.

Income (loss) on variable interest entities was $0.6 million for the three months ended March 31, 2018, compared to income (loss) of $3.7 million for the three months ended March 31, 2017. Income on variable interest entities for the three months ended March 31, 2018 included higher net asset values on most VIEs reflecting lower credit spreads and strengthening of the British Pound Sterling consistent with that implicit in the fair value of the VIE long-term debt obligations. Income (loss) on variable interest entities for the three months ended March 31, 2017 included higher net asset values on most VIEs reflecting lower market interest rates. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities to the Unaudited Consolidated Financial Statements included in Part I, Item 1 in this Form 10-Q for further information on the accounting for VIEs.

Losses and Loss Expenses. Losses and loss expenses are based upon estimates of the aggregate losses inherent in the non-derivative financial guarantee portfolio for insurance policies issued to beneficiaries, including unconsolidated VIEs. Losses and loss expenses include interest on Deferred Amounts pursuant to the Segregated Account Rehabilitation Plan that were discharged on February 12, 2018.

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Ambac records as a component of its loss reserve estimate subrogation recoveries related to securitized loans in RMBS transactions with respect to which Ambac Assurance is pursuing claims for breaches of representations and warranties. Ambac does not include potential recoveries attributed solely to fraudulent inducement claims in our litigations in our estimate of subrogation recoveries. Generally, the sponsor of an RMBS transaction provided representations and warranties with respect to the securitized loans, including representations with respect to the loan characteristics, the absence of borrower fraud in the underlying loan pools or other misconduct in the origination process and attesting to the compliance of loans with the prevailing underwriting policies. Ambac has recorded representation and warranty subrogation recoveries, net of reinsurance, of approximately $1.806 and $1.807 billion at March 31, 2018 and December 31, 2017, respectively. Refer to Note 2. Basis of Presentation and Significant Accounting Policies to the Consolidated Financial Statements included in Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for more information regarding the estimation process for R&W subrogation recoveries.

Losses and loss expenses for the three months ended March 31, 2018 were a benefit of $247.4 million, as compared to a loss for the three months ended March 31, 2017 of $135.0 million. The following provides details, by bond type, for losses and loss expenses (benefit) incurred for the periods presented:

	Three Months Ended March 31,
($ in millions)	2018			2017
RMBS (1)	$	45.8		$	(8.7	)
Domestic Public Finance	(11.3		)	169.2
Student Loans	2.9			2.3
Ambac UK	(14.9		)	(73.8		)
All other credits	(2.3		)	2.2
Interest on Deferred Amounts	20.6			43.8
Discount on Rehabilitation Exit Transactions	$	(288.2	)	$	—
Totals (2)	$	(247.4	)	$	135.0

(1) The losses and loss expense (benefit) associated with changes in estimated representation and warranties was $0.8 and $13.8 for the three months ended March 31, 2018 and 2017, respectively.

(2) Includes loss expenses incurred of $7.5 and $18.2 for the three months ended March 31, 2018 and 2017, respectively.

Losses and loss expenses (benefit) for the three months ended March 31, 2018 were driven by the following:

• Discount achieved pursuant to the Rehabilitation Exit Transactions;

• Lower projected losses in domestic public finance largely driven by the favorable impact of higher discount rates partially offset by some adverse development on Puerto Rico policies;

• A portion of Ambac UK's loss reserves are denominated in currencies other than their functional currency of British Pounds resulting in incurred losses (gains) when the British Pound depreciates (appreciates). Ambac recognized $11.0 million in foreign exchange gains for the three months ended March 31, 2018; partially offset by,

• Higher projected losses in the RMBS portfolio largely driven by the impact of interest rates on excess spread;

• Interest on Deferred Amounts through the Rehabilitation Exit Transactions date.

Losses and loss expenses (benefit) for the three months ended March 31, 2017 were driven by the following:

• Higher projected losses in domestic public finance largely driven by negative development on insured Puerto Rico bonds;

• Interest on Deferred Amounts;

• Lower projected losses in the Ambac UK portfolio primarily due to the confidential settlement of litigation brought by Ambac UK in the name of Ballantyne Re plc ("Ballantyne") against JP Morgan Investment Management Inc. ("JPMIM");

• A portion of Ambac UK's loss reserves are denominated in currencies other than their functional currency of British Pounds resulting in incurred losses (gains) when the British Pound depreciates (appreciates). Ambac recognized $5.8 million in foreign exchange gains for the three months ended March 31, 2017.

The following table provides details of net claims recorded, net of reinsurance for the affected periods:

	Three Months Ended March 31,
($ in millions)	2018			2017
Claims recorded (1) (2) (3)	$	56.7		$	61.8
Subrogation received (4)	(39.0		)	(65.2		)
Net Claims Recorded	$	17.7		$	(3.4	)

(1) Claims recorded include (i) claims paid, including commutation payments and (ii) changes in claims not yet paid for policies allocated to the Segregated Account, including Deferred Amounts and changes in unpresented claims. Item (ii) includes permitted policy claims for policies allocated to the Segregated Account that were presented and approved by the Rehabilitator of the Segregated Account, but not paid through to the balance sheet date in accordance with the amended Segregated Account Rehabilitation Plan and associated rules and guidelines. Claims recorded exclude interest accrued on Deferred Amounts. On February 12, 2018, the rehabilitation of the Segregated Account was concluded and all Deferred Amounts, including accrued interest, were settled. Subsequent to the Rehabilitation Exit Transactions, claims are paid in full.

(2) Claims recorded for the three months ended March 31, 2018 include a reduction of $4.5 million resulting from the Rehabilitation Exit Transactions.

(3) Claims recorded includes claims paid on Puerto Rico policies of $27.1 and $14.4 for the three months ended March 31, 2018 and 2017, respectively.

(4) Subrogation received declined due to the continuous runoff of the RMBS insured portfolio and the impact of higher interest rates on excess spread.

| Ambac Financial Group, Inc. 612018 First Quarter FORM 10-Q |

Operating Expenses. Operating expenses consist of gross operating expenses plus reinsurance commissions. The following table provides details of operating expenses for the periods presented:

	Three Months Ended March 31,
($ in millions)	2018		2017
Compensation	$	15.8	$	12.9
Non-compensation	20.5		14.8
Gross operating expenses	36.3		27.8
Reinsurance commissions, net	0.1		0.3
Total operating expenses	$	36.4	$	28.1

Gross operating expenses for the three months ended March 31, 2018 were $36.3 million, an increase of $8.5 million from the three months ended March 31, 2017. The increase was due to the following:

• Higher compensation costs primarily due to (i) $2.4 million increase of long term incentive compensation costs driven by an improvement in performance factors in addition to new awards issued and (ii) $0.9 million related to the settlement of a previously granted performance restricted stock unit award issued to the former CEO. Such award vested upon the Segregated Account's exit from rehabilitation. These costs were partially offset by lower salaries as a result of reduced headcount since the first quarter of 2017.

• Higher non-compensation costs primarily due to (i) $7.4 million of incremental legal, consulting and advisory fees in connection with the exit from rehabilitation of the Segregated Account, of which $2.2 million relates to legal and consulting services provided for the benefit of OCI, and (ii) $0.9 million of increased other consulting, outside services and subscriptions and data costs. These increased costs were partially offset by (i) a reduction in litigation contingencies of $1.5 million and (ii) lower legal fees.

With the conclusion of the Segregated Account rehabilitation, the duties of the Wisconsin Insurance Commissioner as rehabilitator of the Segregated Account have been discharged. Legal and consulting services provided for the benefit of OCI amounted to $4.5 million during the three months ended March 31, 2018, respectively, compared to $2.3 million for the three months ended March 31, 2017. Subsequent to the Segregated Account's exit from rehabilitation, advisory services for the benefit of OCI will continue, but at a reduced level.

Interest Expense. Interest expense includes accrued interest on secured borrowing notes, Ambac Note, Tier 2 Notes, and surplus notes issued by Ambac Assurance. Additionally, interest expense includes discount accretion on all debt (excluding secured borrowing) as their carrying value is at a discount to par.

The following table provides details by type of obligation for the periods presented:

	Three Months Ended March 31,
($ in millions)	2018		2017
Surplus notes	$	21.0	$	30.3
Investment agreements	—		0.2
Ambac Note	22.1		—
Tier 2 Notes	4.2		—
Secured borrowing	0.8		1.1
Total interest expense	$	48.1	$	31.6

The increase in interest expense for the three months ended March 31, 2018 compared to the three months ended March 31, 2017 primarily results from the issuance of the Ambac Note and Tier 2 Notes in connection with the Rehabilitation Exit Transactions, partially offset by reduced debt balances resulting from surplus notes cancellation and amortization of the secured borrowing notes outstanding. Refer to Note 10. Long-Term Debt to the Unaudited Consolidated Financial Statements included in Part I, Item 1 in this Form 10-Q for further information on the Ambac Note and Tier 2 Notes.

Surplus note principal and interest payments require the approval of OCI. Except for a one-time payment of approximately six months of interest on the surplus notes (other than junior surplus notes) outstanding immediately after the Rehabilitation Exit Transactions, annually from 2011 through 2017, OCI issued its disapproval of the requests of Ambac Assurance to pay the full interest on outstanding surplus notes issued by Ambac on the annual scheduled interest payment date of June 7th. Ambac Assurance have not requested to pay interest on any junior surplus notes since their issuance. The interest on the outstanding surplus notes and junior surplus notes were accrued for and Ambac is accruing interest on the interest amounts following each scheduled interest payment date. Total accrued and unpaid interest for surplus notes and junior surplus notes outstanding to third parties were $127.5 million and $105.0 million, respectively, at March 31, 2018.

Provision for Income Taxes. The provision for income taxes for the three months ended March 31, 2018, was $2.6 million, a decrease of $17.0 million compared to the provision for income taxes reported for three months ended March 31, 2017. The change for the three months ended March 31, 2018 was primarily due to the provision for Ambac UK taxes of $0.0 million for the three months ended March 31, 2018 compared to the three months ended March 31, 2017 of $19.3 million, which was driven primarily by the Ballantyne litigation settlement.

At March 31, 2018 the Company had $3.3 billion of U.S. Federal net ordinary operating loss carryforwards ($1.4 billion at Ambac Financial Group and $1.9 billion at Ambac Assurance.

| Ambac Financial Group, Inc. 622018 First Quarter FORM 10-Q |

LIQUIDITY AND CAPITAL RESOURCES

Ambac Financial Group, Inc. Liquidity. Ambac’s liquidity is dependent on its cash and liquid investments of $274.1 million, (including $126.4 million of Secured Notes issued by Ambac LSNI) as of March 31, 2018 and expense sharing and other arrangements with Ambac Assurance. Ambac also has an investment with an aggregate value of $128.9 million in surplus notes issued by Ambac Assurance and interests in Corolla Trust (as described more fully in Note 1. Background and Business Description to the Consolidated Financial Statements included in Part II, Item 8 in the Company's Annual Report on Form 10-K for the year ended December 31, 2017). Securities issued or insured by Ambac Assurance are generally less liquid that investment grade and other traded investments.

Pursuant to the amended and restated tax sharing agreement among Ambac, Ambac Assurance and certain affiliates (the “Amended TSA"), Ambac Assurance is required, under certain circumstances, to make payments ("tolling payments") to Ambac with respect to the utilization of net operating loss carry-forwards (“NOLs”). Ambac will receive $30.5 million of tolling payments in May 2018 based on NOLs used by Ambac Assurance in 2017. For the three months ended March 31, 2018, Ambac Assurance utilized post determination date NOLs of $406.2 million for which it has accrued a tolling payment liability of $14.1 million which, assuming Ambac Assurance's cumulative full year 2018 taxable income does not fall below $168.2 million, will be paid to Ambac before the end of May of 2019. Under an inter-company cost allocation agreement, Ambac is also reimbursed for certain operating costs and expenses.

It is highly unlikely that Ambac Assurance will be able to make dividend payments to Ambac for the foreseeable future and therefore cash and investments, payments under the intercompany cost allocation agreement and future tolling payments, if any, will be Ambac’s principal source of liquidity in the near term. Refer to Part I, Item 1, “Insurance Regulatory Matters — Dividend Restrictions, Including Contractual Restrictions” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, and Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, for more information on dividend payment restrictions. The principal use of liquidity is the payment of operating expenses, including costs to explore opportunities to grow and diversify Ambac, and the making of investments including securities issued or insured by Ambac Assurance.

Contingencies could cause material liquidity strains.

Ambac Assurance Liquidity. Ambac Assurance’s liquidity is dependent on the balance of liquid investments and, over time, the net impact of sources and uses of funds. The principal sources of Ambac Assurance’s liquidity are gross installment premiums on insurance, principal and interest payments from investments, sales of investments, proceeds from repayment of affiliate loans, recoveries on claim payments, including from litigation, and reinsurance recoveries. Termination of installment premium policies on an accelerated basis may adversely impact Ambac Assurance’s liquidity. The principal uses of Ambac Assurance’s liquidity are the payment of operating expenses, claim, commutation and related expense payments on both insurance and credit derivative contracts, ceded reinsurance premiums, principal and interest payments on the Ambac Note and Secured Borrowing, surplus note principal and interest payments, if approved by OCI, Tier 2 Note payments, additional loans to affiliates and tolling

payments due to Ambac under the Amended TSA. Interest and principal payments on surplus notes are subject to the approval of OCI, which has full discretion over payments regardless of the liquidity position of Ambac Assurance. Any such payment on surplus notes would require either payment or collateralization of a portion of the Tier 2 Notes under the terms of the Tier 2 Note indenture.

Ambac Assurance manages its liquidity risk by maintaining comprehensive analyses of projected cash flows and maintaining specified levels of cash and short-term investments at all times.

Ambac Assurance is limited in its ability to pay dividends pursuant to the terms of its Auction Market Preferred Shares (“AMPS”), which state that dividends may not be paid on the common stock of Ambac Assurance unless all accrued and unpaid dividends on the AMPS for the then current dividend period have been paid, provided that dividends on the common stock may be made at all times for the purpose of, and only in such amounts as are necessary for enabling Ambac (i) to service its indebtedness for borrowed money as such payments become due or (ii) to pay its operating expenses. If dividends are paid on the common stock for such purposes, dividends on the AMPS become cumulative until the date that all accumulated and unpaid dividends have been paid on the AMPS. Ambac Assurance has not paid dividends on the AMPS since 2010. Refer to Part I, Item 1, “Insurance Regulatory Matters - Dividend Restrictions, Including Contractual Restrictions” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, and Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, for more information on dividend payment restrictions.

Our ability to realize representation and warranty subrogation recoveries is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties (and/or their respective parents and affiliates), timing of receipt of any such recoveries, intervention by the OCI, which could impede our ability to take actions required to realize such recoveries, and uncertainty inherent in the assumptions used in estimating such recoveries. The amount of these subrogation recoveries is significant and if we are unable to recover any amounts, our future available liquidity to pay claims would be reduced materially.

Ambac Financial Services ("AFS") Liquidity. AFS provided interest rate swaps to states, municipalities and their authorities, asset-backed issuers and other entities in connection with their financings. Additionally, AFS uses interest rate derivatives as an economic hedge against the effects of rising interest rates elsewhere in the Company, including on Ambac’s financial guarantee exposures. The principal uses of liquidity by AFS are payments on intercompany loans, payments under derivative contracts (primarily interest rate swaps and US Treasury futures), collateral posting and operating expenses. Management believes that AFS’ short and long-term liquidity needs can be funded from intercompany loans from Ambac Assurance and receipts from derivative contracts since AFS borrows cash and securities from Ambac Assurance to meet liquidity needs when such borrowing is determined to be most economically beneficial to Ambac Assurance. Intercompany loans are made under established lending agreements with defined borrowing limits that have received non-disapproval from OCI.

| Ambac Financial Group, Inc. 632018 First Quarter FORM 10-Q |

Cash Flow Statement Discussion. The following table summarizes the net cash flows for the periods presented.

	Three Months Ended March 31,
($ in million)	2018			2017
Cash provided by (used in):
Operating activities	$	(1,191.6	)	$	(4.8	)
Investing activities	657.0			232.5
Financing activities	(50.2		)	(200.3		)
Foreign exchange impact on cash and cash equivalents	(0.3		)	0.5
Net cash flow	$	(585.1	)	$	27.9

Operating activities

The following represents the significant cash activities during the three months ended March 31, 2018 and 2017:

• The cash outflow from the Rehabilitation Exit Transactions to third parties was $1,353.5 million of which $1,162.3 million is included in operating activities and $191.2 is included in financing activities as it relates to payments for surplus note principal. See Note 1. Background and Business Description to the Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q and Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for details regarding the Rehabilitation Exit Transactions.

• Net loss and loss expenses paid, including commutation payments, during the three months ended March 31, 2018 and 2017 are detailed below:

	Three Months Ended March 31,
($ in million)	2018			2017
Net loss and loss expenses paid (recovered):
Net losses paid (1)	$	91.5		$	67.5
Net subrogation received	(39.0		)	(65.2		)
Net loss expenses paid	9.8			8.1
Net cash flow	$	62.3		$	10.4

(1) Net losses paid includes claims paid on Puerto Rico policies of $27.1 million and $14.4 million for the three months ended March 31, 2018 and 2017, respectively.

Future operating cash flows will primarily be impacted by the level of premium collections, investment coupon receipts and claim and operating expense payments.

Financing Activities

Financing activities for the three months ended March 31, 2018 include proceeds from the issuance of Tier 2 Notes of $240.0 million, repayments of a secured borrowing of $8.8 million, payments for the extinguishment of surplus notes of $191.3 million, paydowns of VIE debt obligations of $79.9 million and $8.8 million of debt issuance costs.

Financing activities for the three months ended March 31, 2017 include repayments of a secured borrowing of $10.4 million, payment for investment agreements of $82.4 million and payments for the extinguishment of surplus notes of $43.7 million and paydowns of VIE debt obligations of $47.8 million.

Credit Ratings and Collateral.

Ambac Financial Services, LLC (“AFS”) provided interest rate swaps to states, municipalities and their authorities, asset-backed issuers and other entities in connection with their financings. AFS hedges its interest rate risk, as well as a portion of the interest rate risk in the financial guarantee portfolio, with standardized derivative contracts, including financial futures contracts, which contain collateral or margin requirements. Under these hedge agreements, AFS is required to post collateral or margin to its counterparties and futures commission merchants to cover unrealized losses. In addition, AFS is required to post collateral or margin in excess of the amounts needed to cover unrealized losses. All AFS derivative contracts containing ratings-based downgrade triggers that could result in collateral or margin posting or a termination have been triggered. If terminations were to occur, AFS would be required to make termination payments, but would also receive a return of collateral or margin in the form of cash, U.S. Treasury or U.S. government agency obligations with market values equal to or in excess of market values of the swaps and futures contracts. In most cases, AFS will look to re-establish hedge positions that are terminated early. This may result in additional collateral or margin obligations. The amount of additional collateral or margin posted on derivatives contracts will depend on several variables including the degree to which counterparties exercise their termination rights and the terms on which hedges can be replaced. All collateral and margin obligations are currently met. Collateral and margin posted by AFS totaled a net amount of $107.1 million (cash and securities collateral of $22.8 million and $84.2 million, respectively), including independent amounts, under these contracts at March 31, 2018.

Ambac Credit Products (“ACP”) is not required to post collateral under any of its outstanding credit derivative contracts.

BALANCE SHEET

Total assets decreased by approximately $344 million from December 31, 2017 to $22,848 million at March 31, 2018, primarily due to the net impact of the Rehabilitation Exit Transactions as discussed below. Other significant changes during the three months ended March 31, 2018 were gains from positive market value performance on invested assets and higher VIE assets as a result of lower credit spreads and strengthening of the British Pound Sterling, partially offset by lower intangible assets as a result of amortization.

Total liabilities decreased by approximately $808 million from December 31, 2017 to $20,739 million as of March 31, 2018, primarily as a result of the Rehabilitation Exit Transactions as discussed below. Other significant changes during the three months ended March 31, 2018 were discount amortization plus higher accrued interest payable on remaining surplus notes and new debt, higher VIE liabilities as a result of lower credit spreads and strengthening of the British Pound Sterling, partially offset by declines in unearned premiums from the runoff of the insured portfolio.

As of March 31, 2018 total stockholders’ equity was $2,109 million, compared with total stockholders’ equity of $1,645 million at December 31, 2017. This increase was primarily driven by Total Comprehensive Income during the period. Total Comprehensive Income during 2018 was driven by net income during the period, unrealized gains on investment securities and translation gains related to Ambac's foreign subsidiaries.

| Ambac Financial Group, Inc. 642018 First Quarter FORM 10-Q |

Rehabilitation Exit Transactions.As more fully discussed in Note 1. Background and Business Description to the Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q, Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, and Results of Operations in this Management's Discussion and Analysis, on February 12, 2018, Ambac and Ambac Assurance executed the Rehabilitation Exit Transactions that impacted the following balance sheet accounts:

• Invested assets and cash were reduced by cash outflow of $1,354 million and settlement of Ambac-insured RMBS securities held in the investment portfolio of $1,455 million, partially offset by the receipt of $768 million par amount of the Secured Notes and proceeds from the issuance of Tier 2 notes of $240 million.

• Loss Reserves and Subrogation Recoverable were reduced and increased, respectively, as a result of the settlement of unpaid claims of the Segregated Account, which were approximately $3,867 million (including $840 million of accrued interest) at December 31, 2017. Loss Reserves included $3,080 million of unpaid claims at December 31, 2017. Subrogation Recoverable was net of $787 million of unpaid claims at December 31, 2017. Following the settlement of Deferred Amounts, Loss Reserves decreased $2,555 million and Subrogation Recoverable increased $1,312 million. As a result of the settlement of unpaid claims, certain policies which were previously in a liability position have transitioned to an asset position with a recoverable of $525 million at December 31, 2017.

• Long-term debt has been increased by the Ambac Note issued to Ambac LSNI with a carrying value of approximately $2,148 million and the issuance of Tier 2 Notes with a carrying value of approximately $234 million, partially offset by the consolidated reduction of surplus notes principal with a carrying value of approximately $413 million. Refer to Note 10. Long-term Debt to the Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q for further information regarding Ambac's debt obligations.

Investment Portfolio. Ambac Assurance’s and Everspan's non-VIE investment objective is to achieve the highest risk-adjusted after-tax return on a diversified portfolio of primarily fixed income investments while employing asset/liability management practices to satisfy operating and strategic liquidity needs. Ambac Assurance’s investment portfolio is subject to internal investment guidelines and is subject to limits on types and quality of investments imposed by the insurance laws and regulations of the jurisdictions in which it is licensed, primarily the States of Wisconsin and New York. Such guidelines set forth minimum credit rating requirements and credit risk concentration limits. Within these guidelines, Ambac Assurance opportunistically purchases Ambac Assurance insured securities given their relative risk/reward characteristics. Ambac Assurance’s investment policies are subject to oversight by OCI pursuant to the Settlement Agreement and the Stipulation and Order. The Board of Directors of Ambac Assurance approves any changes to Ambac Assurance's investment policy.

Ambac UK’s non-VIE investment policy is designed with the primary objective of ensuring that Ambac UK is able to meet its financial obligations as they fall due, in particular with respect to policyholder claims. Ambac UK’s investment portfolio is primarily fixed income investments and diversified holdings of pooled investment funds. The portfolio is subject to internal investment guidelines and may be subject to limits on types and quality of investments imposed by the PRA as regulator of Ambac UK. Ambac UK’s investment policy sets forth minimum credit rating requirements and concentration limits, among other restrictions. The Board of Directors of Ambac UK approves any changes or exceptions to Ambac UK’s investment policy.

Ambac Financial Group, Inc.'s non-VIE investment portfolio's primary objective is to preserve capital for strategic uses while maximizing income, including investments in securities issued by or guaranteed by Ambac Assurance.

The following table summarizes the composition of Ambac’s investment portfolio, excluding VIE investments, at carrying value at March 31, 2018 and December 31, 2017:

($ in millions)	March 31, 2018		December 31, 2017
Fixed income securities	$	3,872.0	$	4,652.2
Short-term	321.1		557.3
Other investments	419.9		431.6
Fixed income securities pledged as collateral	84.2		99.7
Total investments (1)	$	4,697.2	$	5,740.8

(1) Includes investments denominated in non-US dollar currencies with a fair value of £203.0 ($284.9) and €41.3 ($50.9) as of March 31, 2018 and £209.8 ($283.6) and €40.9 ($49.1) as of December 31, 2017.

The following table represents the fair value of mortgage and asset-backed securities at March 31, 2018 and December 31, 2017 by classification:

($ in millions)	March 31, 2018		December 31, 2017
Residential mortgage-backed securities:
RMBS—Second Lien	$	335.7	$	839.9
RMBS—First-lien—Alt-A	$	285.8	$	1,029.4
RMBS—First Lien—Sub Prime	201.8		382.0
Total residential mortgage-backed securities	823.3		2,251.3
Other asset-backed securities
Military Housing	240.1		243.4
Student Loans	166.1		152.1
Structured Insurance	134.3		137.6
Auto	26.5		31.6
Credit Cards	22.4		33.0
Other	0.2		0.2
Total other asset-backed securities	589.6		597.9
Total (1)	$	1,412.9	$	2,849.2

(1) Includes investments guaranteed by Ambac Assurance and Ambac UK for both periods presented. Refer to Note 8. Investments to the

| Ambac Financial Group, Inc. 652018 First Quarter FORM 10-Q |

Unaudited Consolidated Financial Statements included in Part I, Item 1 in this Form 10-Q for further details of Ambac insured securities held in the investment portfolio.

The weighted average rating, which is based on the lower of Standard & Poor’s or Moody’s ratings, of the mortgage and asset-backed securities is CC and CCC- as of March 31, 2018, and C and CCC as of December 31, 2017, respectively. The ratings on insured securities reflect the higher of the financial strength rating of the financial guarantor or the rating of the underlying issuer. Rating agencies do not always publish separate underlying ratings (those ratings excluding the insurance by the financial guarantor). In the event these underlying ratings are not available from the rating agencies, Ambac will assign an internal rating.

The following charts provide the ratings ⁽¹⁾ distribution of the fixed income investment portfolio based on fair value at March 31, 2018 and December 31, 2017:

(1) Ratings are based on the lower of Moody’s or S&P ratings. If ratings are unavailable from Moody's or S&P, Fitch ratings are used. If guaranteed, rating represents the higher of the underlying or guarantor’s financial strength rating.

(2) Below investment grade and not rated bonds insured by Ambac represent 66% and 64% of the 2018 and 2017 combined fixed income portfolio, respectively.

The changes in ratings during the three months ended March 31, 2018 were the result of the Rehabilitation Exit Transactions with significant reductions in BIG Ambac-insured RMBS bonds partially offset by the receipt of the Secured Note issued from Ambac LSNI, which is not rated.

Refer to Note 8. Investments to the Unaudited Financial Statements included in Part 1, Item 1 in this Form 10-Q for information about Ambac's consolidated non-VIE investment portfolio.

Premium Receivables.Ambac either received premium upfront at time of issuance of the insurance policy or in installments over the policy term. For installment premium transactions, a premium receivable asset is established equal to the (i) present value of future contractual premiums due or (ii) if the underlying insured obligation is a homogenous pool of assets which are contractually prepayable, the present value of premiums to be collected over the expected life of the transaction. Ambac's premium receivables decreased to $581 million at March 31, 2018 from $586 million at December 31, 2017. As further discussed in Note 6. Financial Guarantee Insurance Contracts, the decrease is due to premium receipts and adjustments for changes in expected and contractual cash flows, partially offset by the impact of currency exchange rates on non-US denominated future premiums, accretion of premium receivable discount and changes to uncollectible premiums.

Premium receivables by payment currency were as follows:

Currency (Amounts in millions)	Premium Receivable in Payment Currency		Premium Receivable in U.S. Dollars
U.S. Dollars	$	379.4	$	379.4
British Pounds	£	116.8	163.9
Euros	€	29.8	36.7
Australian Dollars	A$	1.0	0.7
Total			$	580.7

Reinsurance Recoverable on Paid and Unpaid Losses.Ambac Assurance has reinsurance in place pursuant to surplus share treaty and facultative agreements. To minimize its exposure to losses from reinsurers, Ambac Assurance (i) monitors the financial condition of its reinsurers; (ii) is entitled to receive collateral from its reinsurance counterparties in certain reinsurance contracts; and (iii) has certain cancellation rights that can be exercised by Ambac Assurance in the event of rating agency downgrades of a reinsurer (among other events and circumstances). Ambac Assurance benefited from letters of credit and collateral amounting to approximately $114.3 million from its reinsurers at March 31, 2018.  These collateral amounts are in excess of Ambac’s reinsurance recoverable on paid and unpaid losses for the related reinsurer. As of March 31, 2018 and December 31, 2017, reinsurance recoverable on paid and unpaid losses were $38.8 million and $41.0 million, respectively. The decrease was primarily due to positive loss development within Public Finance.

Insurance Intangible Asset. At the Fresh Start Reporting Date, an insurance intangible asset was recorded which represented the

| Ambac Financial Group, Inc. 662018 First Quarter FORM 10-Q |

difference between the fair value and aggregate carrying value of the financial guarantee insurance and reinsurance assets and liabilities. As of March 31, 2018 and December 31, 2017, the gross carrying value of the insurance intangible asset was $1,601 million and $1,581 million, respectively. Accumulated amortization of the insurance intangible asset was $768 million and $734 million as of March 31, 2018 and December 31, 2017, respectively, resulting in a net insurance intangible asset of $833 million and $847 million, respectively. Other than through amortization, variance in the gross insurance intangible asset is solely from translation gains (losses) from the consolidation of Ambac's foreign subsidiary (Ambac UK).

Derivative Liabilities. The interest rate derivative portfolio is positioned to benefit from rising rates as a partial economic hedge against interest rate exposure in the financial guarantee portfolio. Derivative liabilities decreased from $83 million at December 31, 2017 to $72 million as of March 31, 2018. The decrease resulted primarily from higher interest rates during the three months ended March 31, 2018. The valuation of derivative liabilities (credit derivatives and interest rate swaps) is impacted by the market’s

view of Ambac Assurance’s credit quality. We reflect Ambac’s credit quality in the fair value of such liabilities by including a CVA in the determination of fair value, whereas a lower (higher) CVA, in isolation, would result in an increase (decrease) in the liability. Ambac reduced its derivative liabilities by $0.1 million at March 31, 2018 and $0.1 million at December 31, 2017 to incorporate the market’s view of Ambac’s credit quality.

Loss and Loss Expense Reserves and Subrogation Recoverable. Loss and loss expense reserves are based upon estimates of the ultimate aggregate losses inherent in the non-derivative portfolio for insurance policies issued to beneficiaries, including unconsolidated VIEs. For periods ending prior to February 12, 2018, Loss and loss expense reserves include the unpaid portion of interest accrued on Deferred Amounts established pursuant to the amended Segregated Account Rehabilitation Plan. The loss and loss expense reserves net of subrogation recoverables and before reinsurance as of March 31, 2018 and December 31, 2017 were $244 million and $4,114 million, respectively.

Loss and loss expense reserves are included in the Consolidated Balance Sheets as follows:

	Unpaid Claims				Present Value of Expected Net Cash Flows					Unearned Premium Revenue			Gross Loss and Loss Expense Reserves (2)
($ in millions) Balance Sheet Line Item	Claims		Accrued Interest		Claims and Loss Expenses		Recoveries (1)
March 31, 2018:
Loss and loss expense reserves	$	—	$	—	$	2,593	$	(325	)	$	(129	)	$	2,139
Subrogation recoverable	—		—		275		(2,170		)	—			(1,895		)
Totals	$	—	$	—	$	2,868	$	(2,495	)	$	(129	)	$	244
December 31, 2017:
Loss and loss expense reserves	$	2,412	$	668	$	2,855	$	(1,054	)	$	(136	)	$	4,745
Subrogation recoverable	615		172		102		(1,520		)	—			(631		)
Totals	$	3,027	$	840	$	2,957	$	(2,574	)	$	(136	)	$	4,114

(1) Present value of future recoveries include R&W subrogation recoveries of $1,834 at March 31, 2018 and December 31, 2017.

(2) Includes Euro denominated gross loss and loss expense reserves. US dollar equivalents of such reserves were $21 (€17) and $21 (€18) at March 31, 2018 and December 31, 2017, respectively.

The evaluation process for determining the level of reserves is subject to certain estimates and judgments. Please refer to the "Critical Accounting Policies and Estimates" and “Results of Operations” sections of Management’s Discussion and Analysis of Financial Condition and Results of Operations in addition to Basis of Presentation and Significant Accounting Policies and Loss Reserves sections included in Note 2. Basis of Presentation and Significant Accounting Policies and Note 6. Financial Guarantee Insurance Contracts, respectively of the Consolidated Financial Statements included in Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for further information on loss and loss expenses.

Ambac has exposure to various bond types issued in the debt capital markets. Our experience has shown that, for the majority of bond types, we have not experienced significant claims. The bond types that have experienced significant claims, including through commutations, are residential mortgage-backed securities (“RMBS”) and student loan securities. These two bond types represent87% of our ever-to-date insurance claims recorded with RMBS comprising81%. Although historically RMBS and student loan securities have been the largest source of claim activity there are reserves on Public Finance and Ambac UK credits that may result in significant claim payments in the future.The table below indicates gross par outstanding and the components of gross loss and loss expense reserves related to policies in Ambac’s gross loss and loss expense reserves at March 31, 2018 and December 31, 2017:

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	Gross Par Outstanding (1)(2)		Unpaid Claims				Present Value of Expected Net Cash Flows					Unearned Premium Revenue			Gross Loss and Loss Expense Reserves (1)(3)
($ in millions)			Claims		Accrued Interest		Claims and Loss Expenses		Recoveries
March 31, 2018:
RMBS	$	4,635	$	—	$	—	$	868	$	(2,057	)	$	(18	)	$	(1,207	)
Domestic Public Finance	3,820		—		—		1,218		(389		)	(73		)	756
Student Loans	694		—		—		362		(39		)	(11		)	312
Ambac UK	942		—		—		311		(10		)	(19		)	282
Other credits	509		—		—		22		—			(8		)	14
Loss expenses	—		—		—		87		—			—			87
Totals	$	10,600	$	—	$	—	$	2,868	$	(2,495	)	$	(129	)	$	244
December 31, 2017:
RMBS	$	5,243	$	3,014	$	837	$	888	$	(2,120	)	$	(21	)	$	2,598
Domestic Public Finance	4,265		13		3		1,278		(403		)	(75		)	816
Student Loans	701		—		—		361		(40		)	(13		)	308
Ambac UK	941		—		—		315		(11		)	(18		)	286
All other credits	537		—		—		26		—			(9		)	17
Loss expenses	—		—		—		89		—			—			89
Totals	$	11,687	$	3,027	$	840	$	2,957	$	(2,574	)	$	(136	)	$	4,114

(1) Ceded par outstanding on policies with loss reserves and ceded loss and loss expense reserves are $550 and $39, respectively, at March 31, 2018 and $590 and $41, respectively at December 31, 2017. Ceded loss and loss expense reserves are included in Reinsurance recoverable on paid and unpaid losses.

(2) Gross Par Outstanding includes capital appreciation bonds, which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bond.

(3) Loss reserves are included in the balance sheet as Loss and loss expense reserves or Subrogation recoverable dependent on if a policy is in a net liability or net recoverable position.

RMBS

Ambac has exposure to the U.S. mortgage market primarily through direct financial guarantees of RMBS, including transactions collateralized by first and second liens.

We established a representation and warranty subrogation recovery as further discussed in Note 6. Financial Guarantee Insurance Contracts to the Unaudited Consolidated Financial Statements included in Part I, Item 1 in this Form 10-Q. Our ability to realize RMBS representation and warranty recoveries is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties (and/or their respective parents and affiliates), timing of receipt of any such

recoveries, intervention by the OCI, which could impede our ability to take actions required to realize such recoveries, and uncertainty inherent in the assumptions used in estimating such recoveries.

The table below distinguishes between RMBS credits for which we have not established a representation and warranty subrogation recovery and those for which we have, providing in both cases the gross par outstanding, gross loss reserves before representation and warranty subrogation recoveries and gross loss reserves net of representation and warranty subrogation recoveries for all RMBS exposures for which Ambac established reserves at March 31, 2018 and December 31, 2017:

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($ in millions)	Gross Par Outstanding		Gross Loss Reserves Before Representation and Warranty Subrogation Recoveries		Representation and Warranty Subrogation Recoveries			Gross Loss Reserves Net of Representation and Warranty Subrogation Recoveries
March 31, 2018:
Second-lien	$	831	$	257	$	—		$	257
First-lien Mid-prime	1,738		89		—			89
First-lien Sub-prime	659		102		—			102
Other	121		7		—			7
Total Credits Without Subrogation	3,349		455		—			455
Second-lien	527		8		(1,275		)	(1,267		)
First-lien Mid-prime	54		6		(78		)	(72		)
First-lien Sub-prime	705		158		(481		)	(323		)
Total Credits With Subrogation	1,286		172		(1,834		)	(1,662		)
Total	$	4,635	$	627	$	(1,834	)	$	(1,207	)
December 31, 2017:
Second-lien	$	1,065	$	735	$	—		$	735
First-lien-Mid-prime	1,849		1,997		—			1,997
First-lien-Sub-prime	667		190		—			190
Other	137		144		—			144
Total Credits Without Subrogation	3,718		3,066		—			3,066
Second-lien	735		719		(1,272		)	(553		)
First-lien Mid-prime	59		104		(79		)	25
First-lien Sub-prime	731		543		(483		)	60
Total Credits With Subrogation	1,525		1,366		(1,834		)	(468		)
Total	$	5,243	$	4,432	$	(1,834	)	$	2,598

Public Finance

Ambac’s U.S. public finance portfolio consists predominantly of municipal bonds such as general and revenue obligations and lease and tax-backed obligations of state and local government entities; however, the portfolio also comprises a wide array of non-municipal types of bonds, including financings for not-for-profit entities and transactions with public and private elements, which generally finance infrastructure, housing and other public purpose

facilities and interests. The decline in public finance gross loss reserves at March 31, 2018 as compared to December 31, 2017 was primarily related to the payment of claims and an increase in loss reserve discount rates, partially offset by the continued uncertainty and volatility of the situation in Puerto Rico. Total public finance gross loss reserves and related gross par outstanding on Ambac insured obligations by bond type were as follows:

	March 31, 2018				December 31, 2017
Issuer Type ($ in millions)	Gross Par Outstanding (1)		Gross Loss Reserves		Gross Par Outstanding (1)		Gross Loss Reserves
Lease and tax-backed	$	2,196	$	618	$	2,201	$	650
General obligation	984		53		1,053		60
Transportation revenue	93		45		495		64
Housing	447		29		449		31
Other	100		11		67		11
Total	$	3,820	$	756	$	4,265	$	816

(1) Gross Par Outstanding includes capital appreciation bonds, which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bond.

Variability of Expected Losses and Recoveries

Ambac’s management believes that the estimated future loss component of loss reserves are adequate to cover future claims

presented, but there can be no assurance that the ultimate liability will not be higher than such estimates.

It is possible that our estimated future losses for insurance policies discussed above could be understated. We have attempted to

| Ambac Financial Group, Inc. 692018 First Quarter FORM 10-Q |

identify possible cash flows using more stressful assumptions than the probability-weighted outcome recorded. The possible net cash flows consider the highest stress scenario that was utilized in the development of our probability-weighted expected loss at March 31, 2018 and assumes an inability to execute any commutation transactions with issuers and/or investors. Such stress scenarios are developed based on management’s view about all possible outcomes. In arriving at such view, management makes considerable judgments about the possibility of various future events. Although we do not believe it is possible to have stressed outcomes in all cases, it is possible we could have stress case outcomes in some or even many cases.

RMBS Variability:

Changes to assumptions that could make our reserves under-estimated include an increase in interest rates, deterioration in housing prices, poor servicing, the effect of a weakened economy characterized by growing unemployment and wage pressures, and/or illiquidity of the mortgage market. We utilize a model to project losses in our RMBS exposures and changes to reserves, either upward or downward, are not unlikely if we used a different model or methodology to project losses. We regularly assess models and methodologies and may change our approach and/or model. Additionally, our R&W actual subrogation recoveries could be significantly lower than our estimate of $1,834 million as of March 31, 2018 if the sponsors of these transactions: (i) fail to honor their obligations to repurchase the mortgage loans, (ii) successfully dispute our breach findings, (iii) no longer have the financial means to fully satisfy their obligations under the transaction documents, or (iv) our pursuit of recoveries is otherwise unsuccessful.

In the case of both first and second-lien exposures, the possible stress case assumes a lower housing price appreciation projection, which in turn drives higher defaults and severities. Using this approach, the possible increase in loss reserves for RMBS credits for which we have an estimate of expected loss at March 31, 2018 could be approximately $40 million. Combined with the absence of any R&W subrogation recoveries, a possible increase in loss reserves for RMBS could be approximately $1.9 billion. Additionally, loss payments are sensitive to changes in interest rates, increasing as interest rates rise. For example an increase in interest rates of 0.50% could increase our estimate of expected losses by approximately $40 million. There can be no assurance that losses may not exceed such amounts.

Public Finance Variability:

It is possible our loss reserves for public finance credits may be under-estimated if issuers are faced with prolonged exposure to adverse political, economic, fiscal or socioeconomic events or trends.

Our experience with the city of Detroit in its bankruptcy proceeding was not favorable and renders future outcomes with other public finance issuers even more difficult to predict and may increase the risk that we may suffer losses that could be sizable. We agreed to settlements regarding our insured Detroit general obligation bonds that provide better treatment of our exposures than the city planned to include in its plan of adjustment, but nevertheless required us to incur a loss for a significant portion of our exposure. An additional troubling precedent in the Detroit case, as well as other municipal bankruptcies, is the preferential treatment of certain

creditor classes, especially the public pensions. The cost of pensions and the need to address frequently sizable unfunded or underfunded pensions is often a key driver of stress for many municipalities and their related authorities, including entities to whom we have significant exposure, such as Chicago, its school district, the State of New Jersey and many others. Less severe treatment of pension obligations in bankruptcy may lead to worse outcomes for traditional debt creditors. In addition, cities may be more inclined to use bankruptcy to resolve their financial stresses if they believe preferred outcomes for various creditor groups can be achieved.

We expect municipal bankruptcies and defaults to continue to be challenging to project given the unique political, economic, fiscal, governance and public policy differences among municipalities as well as the complexity, long duration and relative infrequency of the cases themselves in forums with a scarcity of legal precedent.

Another potentially adverse development that could cause the loss reserves on our public finance credits to be underestimated is deterioration in the municipal bond market, resulting from reduced or no access to alternative forms of credit (such as bank loans) or other exogenous factors, such as the Tax Cuts and Jobs Act that was signed into law on December 22, 2017, which could potentially reduce municipal investor appetite for tax-exempt municipal bonds by corporate investors and over the longer term could potentially put additional pressure on issuers in states with high state and local taxes. These factors could deprive issuers access to funding at a level necessary to avoid defaulting on their obligations. While our loss reserves consider our judgment regarding issuers’ financial flexibility to adapt to adverse markets, they may not adequately capture sudden, unexpected or protracted uncertainty that adversely affects market conditions.

Our exposures to the Commonwealth of Puerto Rico are under stress arising from the Commonwealth’s poor financial condition, weak economy, loss of capital markets access and the severe damage caused by hurricanes Irma and Maria. These factors, taken together with the payment moratorium on debt payments of the Commonwealth and its instrumentalities, ongoing Puerto Rico Oversight, Management, and Economic Stability Act ("PROMESA") Title III proceedings, and certain other provisions under PROMESA, the potential for a restructuring of debt insured by Ambac Assurance, either with or without its consent, and the possibility of protracted litigation as a result of which its rights may be materially impaired, may cause losses to exceed current reserves in a material manner. See "Financial Guarantees in Force" section of Management’s Discussion and Analysis of Financial Condition and Results of Operations included in Part II, Item 7 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for further details on the legal, economic and fiscal developments that have impacted or may impact Ambac Assurance’s insured Puerto Rico bonds. In this Form 10-Q, refer to "Financial Guarantees in Force" in Part I, Item 2 in Management's Discussion and Analysis of Financial Condition and Results of Operation and Note 12. Commitments and Contingencies to the Consolidated Financial Statements for further updates related to Puerto Rico.

For public finance credits, including Puerto Rico as well as other issuers, for which we have an estimate of expected loss at March 31, 2018, the possible increase in loss reserves could be

| Ambac Financial Group, Inc. 702018 First Quarter FORM 10-Q |

approximately $1.34 billion. However, there can be no assurance that losses may not exceed such amount.

Student Loan Variability:

Changes to assumptions that could make our reserves under-estimated include, but are not limited to, increases in interest rates, default rates and loss severities on the collateral due to economic or other factors. Such factors may include lower recoveries on defaulted loans or additional losses on collateral or trust assets, including as a result of any enforcement actions of the Consumer Finance Protection Bureau. For student loan credits for which we have an estimate of expected loss at March 31, 2018, the possible increase in loss reserves could be approximately $90 million. However, there can be no assurance that losses may not exceed such amount. Additionally, an increase in interest rates of 0.50% could increase our estimate of expected losses by approximately $35 million. There can be no assurance that losses may not exceed such amount.

Other Credits, including Ambac UK, Variability:

It is possible our loss reserves on other types of credits, including those insured by Ambac UK, may be under-estimated because of various risks that vary widely, including the risk that we may not be able to recover or mitigate losses through our remediation processes. For all other credits, including Ambac UK, for which we have an estimate of expected loss, the sum of all the highest stress case loss scenarios is approximately $200 million greater than the loss reserves at March 31, 2018. However, there can be no assurance that losses may not exceed such amount.

SPECIAL PURPOSE AND VARIABLE INTEREST ENTITIES

Please refer to Note 3. Special Purpose Entities, Including Variable Interest Entities to the Unaudited Consolidated Financial Statements included in Part I, Item 1 in this Form 10-Q and Note 2. Basis of Presentation and Significant Accounting Policies and Note 3. Special Purpose Entities, Including Variable Interest Entities to the Consolidated Financial Statements, included in Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, for information regarding special purpose and variable interest entities.

ACCOUNTING STANDARDS

Please refer to Note 2. Basis of Presentation and Significant Accounting Policies to the Unaudited Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q, for a discussion of the impact of recent accounting pronouncements on Ambac’s financial condition and results of operations.

AMBAC ASSURANCE STATUTORY BASIS FINANCIAL RESULTS

Ambac Assurance and Everspan's statutory financial statements are prepared on the basis of accounting practices prescribed or permitted by the OCI. OCI recognizes only statutory accounting practices prescribed or permitted by the State of Wisconsin (“SAP”) for determining and reporting the financial condition and results of operations of an insurance company for determining its solvency under Wisconsin Insurance Law. The National

Association of Insurance Commissioners (“NAIC”) Accounting Practices and Procedures manual (“NAIC SAP”) has been adopted as a component of prescribed practices by the State of Wisconsin. For further information, see "Ambac Assurance Statutory Basis Financial Results," in Part II, Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations," and Note 8. Insurance Regulatory Restrictions to the Consolidated Financial Statements included in Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

In connection with the exit of the Segregated Account from rehabilitation and the merger of the Segregated Account into Ambac Assurance, Ambac Assurance requested and received permission from OCI of a permitted practice to restate its unassigned funds (surplus) balance, as of January 1, 2018, to $100 million with an offsetting reduction to gross paid-in and contributed surplus such that total surplus remained unchanged.

Ambac Assurance’s statutory policyholder surplus and qualified statutory capital (defined as the sum of policyholders surplus and mandatory contingency reserves) were $1,307.1 million and $1,773.6 million at March 31, 2018, respectively, as compared to $699.6 million and $1,155.8 million at December 31, 2017, respectively. The drivers to the net increase were:

• Statutory net income of $199.4 million. Statutory net income was positively impacted by the Second Amended Plan of Rehabilitation whereby Ambac Assurance settled its unpaid claims at a discount of approximately $288 million which was recognized as a reduction to losses incurred, partially offset by the loss on extinguishment of surplus notes received of $43.0 million.

• In connection with the Second Amended Plan of Rehabilitation, the par amount of Ambac Assurance's remaining surplus notes of $361.5 million was reclassified from liabilities to a component of policyholders surplus.

• A decrease from a one-time interest payment on the remaining surplus notes (other than junior surplus notes) of $13.5 million.

The execution of Surplus Note exchanges are being accounted for as a debt modification since the creditors before and after the discount remain the same and the change in the terms were not considered substantial. Under debt modification accounting, no gain or loss is recorded at transaction execution and a new effective interest rate is established based on the cash flows of the new Ambac Note.

Ambac Assurance’s statutory policyholder surplus includes $369.3 million of junior surplus notes issued by the Segregated Account. The junior surplus notes, the remaining surplus notes, the Ambac Note, the Tier 2 Notes and the preferred stock issued by Ambac Assurance, are obligations that have claims on the resources of Ambac Assurance which impact Ambac's ability to realize residual value from its equity in Ambac Assurance.

Ambac Assurance statutory surplus is sensitive to multiple factors, including: (i) loss reserve development, (ii) approval by OCI of payments on surplus notes, including junior surplus notes, (iii) ongoing interest costs associated with the Ambac Note and Tier 2

| Ambac Financial Group, Inc. 712018 First Quarter FORM 10-Q |

Notes, including changes to interest rates as the Ambac Note is a floating rate obligation, (iv) deterioration in the financial position of Ambac Assurance subsidiaries that have their obligations guaranteed by Ambac Assurance, (v) first time payment defaults of insured obligations, which increase statutory loss reserves, (vi) commutations of insurance policies or credit derivative contracts at amounts that differ from the amount of liabilities recorded, (vii) reinsurance contract terminations at amounts that differ from net assets recorded, (viii) changes to the fair value of investments carried at fair value, (ix) settlements of representation and warranty breach claims at amounts that differ from amounts recorded, including failures to collect such amounts or receive recoveries sufficient to pay or redeem the Ambac Note and Tier 2 Notes, (x) realized gains and losses, including losses arising from other than temporary impairments of investment securities, and (xi) future changes to prescribed practices by the OCI.

AMBAC UK FINANCIAL RESULTS UNDER UK ACCOUNTING PRINCIPLES

Ambac UK is required to prepare financial statements under FRS 102 "The Financial Reporting Standard applicable in the UK and Republic of Ireland." Ambac UK’s shareholder funds under UK GAAP were £265.4 million at March 31, 2018 as compared to £266.3 million at December 31, 2017.  The reduction in shareholders’ funds was primarily due to losses on certain investment funds due to equity market volatility in the period and unrealized foreign exchange losses on investments denominated in currencies other than Ambac UK's functional currency (British Pounds), offset by net income arising from the receipt of premiums, investment return on fixed income and other investments and a reduction in loss provisions. At March 31, 2018, the carrying value of cash and investments was £451.6 million, a decrease from £459.8 million at December 31, 2017. The decrease in cash and investments is due to the losses on certain investment funds and unrealized foreign exchange losses as noted above, offset by continued receipt of premiums and investment returns from the remainder of Ambac UK's investment portfolio.

Ambac UK is also required to prepare financial information in accordance with the Solvency II Directive.  The basis of preparation of this information is significantly different from both US GAAP and UK GAAP.  The calculation of available and eligible capital resources, regulatory capital requirements and regulatory capital deficits under Solvency II at December 31, 2017 represents the most recent available data for these items. The calculation of capital resources, regulatory capital requirements and regulatory capital deficit of Ambac UK as at March 31, 2018 will be finalized on May 12, 2018 and will be published on Ambac's website shortly thereafter.

Available capital resources under Solvency II were a surplus of £54.1 million at December 31, 2017 of which £17.0 million were eligible to meet solvency capital requirements. The eligible capital resources at December 31, 2017 were in comparison to regulatory capital requirements of £346.3 million. Ambac UK is therefore deficient in terms of compliance with applicable regulatory capital requirements by £329.3 million at December 31, 2017. The regulators are aware of the deficiency in capital resources as compared to capital requirements and dialogue between Ambac UK management and its regulators remains ongoing with respect

to options for addressing the shortcoming, although such options remain few.

NON-GAAP FINANCIAL MEASURES

In addition to reporting the Company’s quarterly financial results in accordance with GAAP, the Company reports two non-GAAP financial measures: Adjusted Earnings and Adjusted Book Value. The most directly comparable GAAP measures are net income attributable to common stockholders for Adjusted earnings and Total Ambac Financial Group, Inc. stockholders’ equity for Adjusted Book value. A non-GAAP financial measure is a numerical measure of financial performance or financial position that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP. We are presenting these non-GAAP financial measures because they provide greater transparency and enhanced visibility into the underlying drivers of our business. Adjusted Earnings and Adjusted Book Value are not substitutes for the Company’s GAAP reporting, should not be viewed in isolation and may differ from similar reporting provided by other companies, which may define non-GAAP measures differently.

Ambac has a significant U.S. tax net operating loss (“NOL”) that is offset by a full valuation allowance in the GAAP consolidated financial statements. As a result of this and other considerations, we utilized a 0% effective tax rate for non-GAAP adjustments; which is subject to change.

The following paragraphs define each non-GAAP financial measure and describe why it is useful. A reconciliation of the non-GAAP financial measure and the most directly comparable GAAP financial measure is also presented below.

Adjusted Earnings (Loss). Adjusted Earnings (Loss) is defined as net income (loss) attributable to common stockholders, as reported under GAAP, adjusted on an after-tax basis for the following:

• Non-credit impairment fair value (gain) loss on credit derivatives: Elimination of the non-credit impairment fair value gains (losses) on credit derivatives, which is the amount in excess of the present value of the expected estimated credit losses. Such fair value adjustments are affected by, and in part fluctuate with, changes in market factors such as interest rates and credit spreads, including the market’s perception of Ambac’s credit risk (“Ambac CVA”), and are not expected to result in an economic gain or loss. These adjustments allow for all financial guarantee contracts to be accounted for consistent with the Financial Services – Insurance Topic of ASC, whether or not they are subject to derivative accounting rules.

• Insurance intangible amortization: Elimination of the amortization of the financial guarantee insurance intangible asset that arose as a result of Ambac’s emergence from bankruptcy and the implementation of Fresh Start reporting. This adjustment ensures that all financial guarantee contracts are accounted for consistent with the provisions of the Financial Services – Insurance Topic of the ASC.

• Foreign exchange (gains) losses: Elimination of the foreign exchange gains (losses) on the re-measurement of assets, liabilities and transactions in non-functional currencies. This

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adjustment eliminates the foreign exchange gains (losses) on all assets, liabilities and transactions in non-functional currencies, which enables users of our financial statements to better view the business results without the impact of fluctuations in foreign currency exchange rates, particularly as assets held in non-functional currencies have grown, and facilitates period-to-period comparisons of Ambac's operating performance.

• Fair value (gain) loss on interest rate derivative from Ambac CVA: Elimination of the gains (losses) relating to Ambac’s

CVA on interest rate derivative contracts. Similar to credit derivatives, fair values include the market’s perception of Ambac’s credit risk and this adjustment only allows for such gain or loss when realized

The following table reconciles net income attributable to common stockholders to the non-GAAP measure, Adjusted Earnings on a dollar amount and per diluted share basis, for all periods presented:

	Three Months Ended March 31,
	2018						2017
($ in millions, except share data)	$ Amount			Per Diluted Share			$ Amount			Per Diluted Share
Net income (loss) attributable to common stockholders	$	305.7		$	6.70		$	(125.4	)	$	(2.77	)
Adjustments:
Non-credit impairment fair value (gain) loss on credit derivatives	0.5			0.01			1.7			0.04
Insurance intangible amortization	28.6			0.63			37.5			0.83
Foreign exchange (gains) losses	(5.0		)	(0.12		)	(7.1		)	(0.16		)
Fair value (gain) loss on interest rate derivatives from Ambac CVA	—			—			2.0			0.05
Adjusted earnings (loss)	$	329.8		$	7.22		$	(91.2	)	$	(2.01	)

Net income (loss) effects of financial guarantee VIE consolidation: VIEs that were consolidated as a result of financial guarantees provided by Ambac are accounted for on a fair value basis. Included within Net income (loss) attributable to common stockholders of these consolidated VIEs was $0.6 million and $3.7 million for the three months ended March 31, 2018 and 2017, respectively. Had these financial guarantee VIEs been accounted for under the provisions of the Financial Services - Insurance Topic of the ASC, included within Net income (loss) would have been $4.1 million and $3.4 million for the three months ended March 31, 2018 and 2017, respectively. The difference between these different accounting bases (including per share amounts) was $3.5 million ($0.08 per diluted share) and $(0.3) million ($(0.01) per diluted share), for the three months ended March 31, 2018 and 2017, respectively. This is supplemental information only and is not a component of Adjusted Earnings.

Adjusted Book Value.Adjusted Book Value is defined as Total Ambac Financial Group, Inc. stockholders’ equity as reported under GAAP, adjusted for after-tax impact of the following:

• Non-credit impairment fair value losses on credit derivatives: Elimination of the non-credit impairment fair value loss on credit derivatives, which is the amount in excess of the present value of the expected estimated economic credit loss. GAAP fair values are affected by, and in part fluctuate with, changes in market factors such as interest rates, credit spreads, including Ambac’s CVA that are not expected to result in an economic gain or loss. These adjustments allow for all financial guarantee contracts to be accounted for within Adjusted Book Value consistent with the provisions of the Financial Services—Insurance Topic of the ASC, whether or not they are subject to derivative accounting rules.

• Insurance intangible asset: Elimination of the financial guarantee insurance intangible asset that arose as a result of

Ambac’s emergence from bankruptcy and the implementation of Fresh Start reporting. This adjustment ensures that all financial guarantee contracts are accounted for within Adjusted Book Value consistent with the provisions of the Financial Services—Insurance Topic of the ASC.

• Ambac CVA on interest rate derivative liabilities: Elimination of the gain relating to Ambac’s CVA on interest rate derivative contracts. Similar to credit derivatives, fair values include the market’s perception of Ambac’s credit risk and this adjustment only allows for such gain when realized.

• Net unearned premiums and fees in excess of expected losses: Addition of the value of the unearned premium revenue ("UPR") on financial guarantee contracts, in excess of expected losses, net of reinsurance. This non-GAAP adjustment presents the economics of UPR and expected losses for financial guarantee contracts on a consistent basis. In accordance with GAAP, stockholders’ equity reflects a reduction for expected losses only to the extent they exceed UPR. However, when expected losses are less than UPR for a financial guarantee contract, neither expected losses nor UPR have an impact on stockholders’ equity. This non-GAAP adjustment adds UPR in excess of expected losses, net of reinsurance, to stockholders’ equity for financial guarantee contracts where expected losses are less than UPR.

• Net unrealized investment (gains) losses in Accumulated Other Comprehensive Income:Elimination of the unrealized gains and losses on the Company’s investments that are recorded as a component of accumulated other comprehensive income (“AOCI”). The AOCI component of the fair value adjustment on the investment portfolio may differ from realized gains and losses ultimately recognized by the Company based on the Company’s investment strategy. This adjustment only allows for such gains and losses in Adjusted Book Value when realized.

| Ambac Financial Group, Inc. 732018 First Quarter FORM 10-Q |

The following table reconciles Total Ambac Financial Group, Inc. stockholders’ equity to the non-GAAP measure Adjusted Book Value on a dollar amount and per share basis, for all periods presented:

	March 31, 2018						December 31, 2017
($ in millions, except share data)	$ Amount			Per Share			$ Amount			Per Share
Total Ambac Financial Group, Inc. stockholders’ equity	$	1,845.1		$	40.70		$	1,381.1		$	30.52
Adjustments:
Non-credit impairment fair value losses on credit derivatives	1.0			0.02			0.6			0.01
Insurance intangible asset	(833.0		)	(18.37		)	(847.0		)	(18.71		)
Net unearned premiums and fees in excess of expected losses	570.9			12.59			597.3			13.20
Net unrealized investment (gains) losses in Accumulated Other Comprehensive Income	(153.1		)	(3.38		)	(30.8		)	(0.68		)
Adjusted book value	$	1,430.9		$	31.56		$	1,101.3		$	24.34

Stockholders' equity effects of financial guarantee VIE consolidation: VIEs that were consolidated as a result of financial guarantees provided by Ambac are accounted for on a fair value basis. The impact on Total Ambac Financial Group, Inc. stockholders' equity of these consolidated VIEs was $136.5 million and $134.1 million at March 31, 2018 and December 31, 2017, respectively. Had these financial guarantee VIEs been accounted for under the provisions of the Financial Services Insurance Topic of the ASC, included within stockholders' equity would have been $179.7 million and $178.7 million at March 31, 2018 and December 31, 2017, respectively. The net difference between these different accounting bases (including per share amounts) was $43.3 million ($0.95 per share) and $44.6 million ($0.99 per share) at March 31, 2018 and December 31, 2017, respectively. This is supplemental information only and is not a component of Adjusted Book Value.

Factors that impact changes to Adjusted Book Value include many of the same factors that impact Adjusted Earnings, including the majority of revenues and expenses, but generally exclude components of premium earnings since they are embedded in prior period's Adjusted Book Value through the net unearned premiums and fees in excess of expected losses adjustment. Net unearned premiums and fees in excess of expected losses will affect Adjusted Book Value for (i) changes to future premium assumptions (e.g. expected term, interest rates, foreign currency rates, time passage) and (ii) changes to expected losses for policies which do not exceed their related unearned premiums. The Adjusted Book Value increase from December 31, 2017 to March 31, 2018 was primarily driven by Adjusted earnings.

Item 3.    Quantitative and Qualitative Disclosures about Market Risk

Market risk represents the potential for losses that may result from changes in the value of a financial instrument as a result of changes in market conditions. The primary market risks that would impact the value of Ambac’s financial instruments are interest rate risk, credit spread risk and foreign currency risk. As a result of the Rehabilitation Exit Transactions, as of March 31, 2018 Ambac's investment portfolio is lower and long-term debt has increased which has changed our exposure to interest rate and credit spread risk compared to the sensitivities disclosed in our Annual Report on Form 10-K for the year ended December 31, 2017. Below we

discuss each of these risks and the specific types of financial instruments impacted. Senior managers are responsible for developing and applying methods to measure risk. Ambac utilizes various systems, models and sensitivity scenarios to monitor and manage market risk. These models include estimates, made by management, which utilize current and historical market information. The valuation results from these models could differ materially from amounts that would actually be realized in the market. Financial instruments of VIEs that are consolidated as a result of Ambac's financial guarantees are excluded from the market risk measures below.

Interest Rate Risk:

Financial instruments for which fair value may be affected by changes in interest rates consist primarily of fixed income investment securities, long-term debt and interest rate derivatives. Fixed income investment securities that are guaranteed by Ambac have interest rate risk characteristics that behave inversely to those associated with future financial guarantee claim payments. Accordingly, such securities are excluded from the interest rate sensitivity table below. Changes in fair value resulting from changes in interest rates are driven primarily by the impact of interest rate shifts on the investment portfolio (which produce net fair value losses as rates increase) and long-term debt and the interest rate derivatives portfolio (which produce net fair value gains as rates increase). Interest rate increases would also have a negative economic impact on expected future claim payments within the financial guarantee portfolio, primarily related to RMBS and student loan credits. Ambac performs scenario testing to measure the potential for losses in volatile markets. These scenario tests include parallel and non-parallel shifts in the benchmark interest rate curve.

The interest rate derivatives portfolio is managed as a partial economic hedge against the effects of rising interest rates elsewhere in the Company, including on Ambac's financial guarantee exposures (the "macro-hedge"). The interest rate sensitivity of the interest rate derivatives portfolio attributable to the macro-hedge position would produce mark-to-market gains or losses of approximately $0.9 million for a 1 basis point parallel shift in USD benchmark interest rates up or down at March 31, 2018.

| Ambac Financial Group, Inc. 742018 First Quarter FORM 10-Q |

The following table summarizes the estimated change in fair value (based primarily on the valuation methodology discussed in Note 7. Fair Value Measurements to the Consolidated Financial Statements included in Part I, Item 1 in this Form 10-Q) on these financial instruments, assuming immediate changes in interest rates at specified levels at March 31, 2018:

	Change in Interest Rates
($ in millions)	300 basis point rise			200 basis point rise			100 basis point rise			Base scenario			100 basis point decline(1)			200 basis point decline(1)
Estimated change in net fair value	$	264		$	179		$	90		$	—		$	(100	)	$	(195	)
Estimated net fair value	(620		)	(705		)	(794		)	(884		)	(984		)	(1,079		)

(1) Incorporates an interest rate floor of 0%.

Due to the low interest rate environment as of March 31, 2018, stress scenarios involving interest rate declines greater than 200 basis points are not meaningful to Ambac's portfolios.

Credit Spread Risk

Financial instruments that may be adversely affected by changes in spreads include Ambac’s outstanding credit derivative contracts, certain interest rate derivatives and investment assets. Changes in spreads are generally caused by changes in the market’s perception of the credit quality of the underlying obligor. Market liquidity and

prevailing risk premiums demanded by market participants are also reflected in spreads and impact valuations.

The following table summarizes the estimated change in fair values on Ambac’s net derivative liabilities assuming immediate parallel shifts in reference obligation credit spreads related to written credit derivatives and counterparty credit spreads related to uncollateralized interest rate derivatives at March 31, 2018. It is more likely that actual changes in credit spreads will vary by obligor:

	Change in Obligor Spreads
($ in millions)	250 basis point widening			50 basis point widening			Base scenario			50 basis point narrowing			250 basis point narrowing
Estimated change in fair value	$	(20	)	$	(4	)	$	—		$	4		$	8
Estimated fair value	(30		)	(14		)	(10		)	(6		)	(2		)

Also included in the fair value of credit derivative liabilities is the effect of Ambac’s creditworthiness, which reflects market perception of Ambac’s ability to meet its obligations. Incorporating estimates of Ambac’s credit valuation adjustment into the determination of fair value has resulted in a $0.1 million reduction to the credit derivatives liability as of March 31, 2018. At March 31, 2018 the credit valuation adjustment resulted in an 9.2% reduction of the credit derivative liability as measured before considering Ambac credit risk. Refer to Note 7. Fair Value Measurements to the Consolidated Financial Statements included in Part I, Item 1 in this Form 10-Q for further information on measurement of the credit valuation adjustment.

The fair value of interest rate derivatives may also be affected by changes to the credit valuation adjustment attributable to the risk of Ambac non-performance. Generally, the need for an Ambac credit valuation adjustment is mitigated by the existence of collateral posting agreements under which adequate collateral has been posted. Derivative contracts entered into with credit exposure to financial guarantee customers are not typically subject to collateral posting agreements. As a result of the commutation of certain such derivatives in June 2017, there are no significant

uncollateralized interest rate derivative liabilities as of March 31, 2018. Therefore, Ambac’s credit valuation adjustment included in the fair value of interest rate swaps was $0.0 million as of March 31, 2018.

As a result of declines in uncollateralized interest rate and credit default swap liabilities during 2017, changes in Ambac credit spreads as much as 250 basis points would result in less than a $1 million impact to the fair value of derivatives at March 31, 2018.

Ambac’s fixed income investment portfolio contains securities with different sensitivities to and volatility of spreads. Fixed income securities that are guaranteed by Ambac and were purchased in Ambac's investment portfolio have credit spread risk characteristics that behave inversely to those associated with future financial guarantee claim payments. Accordingly, such securities are excluded from the company's spread sensitivity measures. The following table summarizes the estimated change in fair values of Ambac’s fixed income investment portfolio assuming immediate shifts in credit spreads across holdings other than Ambac guaranteed securities at March 31, 2018. It is more likely that actual changes in credit spreads will vary by security:

	Change in Spreads
($ in millions)	250 basis point widening			50 basis point widening			Base scenario		50 basis point narrowing (1)		250 basis point narrowing (1)
Estimated change in fair value	$	(87	)	$	(18	)	$	—	$	19	$	54
Estimated fair value	2,261			2,330			2,348		2,367		2,402

(1) Incorporates a credit spread floor of 0 basis points.

| Ambac Financial Group, Inc. 752018 First Quarter FORM 10-Q |

Foreign Currency Risk

Ambac has financial instruments denominated in currencies other than the U.S. dollar, primarily pounds sterling and euros. These financial instruments are primarily invested assets of Ambac UK and credit derivative contracts. The following table summarizes the estimated net change in fair value of these financial instruments assuming immediate shifts in spot foreign exchange rates to U.S. dollars as of March 31, 2018.

	Change in Foreign Exchange Rates Against U.S. Dollar
($ in millions)	20% Decrease			10% Decrease			10% Increase		20% Increase
Estimated change in fair value	$	(68	)	$	(34	)	$	34	$	68

Item 4.     Controls and Procedures.

In connection with the preparation of this first quarter Form 10-Q, an evaluation was carried out by Ambac’s management, with the participation of Ambac’s Chief Executive Officer and Chief Financial Officer, of the effectiveness of Ambac’s disclosure controls and procedures (as defined in rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934 (Exchange Act)) as of the end of the period covered by this Quarterly Report on Form 10-Q. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Disclosure controls and procedures are designed to ensure that the information required to be disclosed in reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms and that such information is accumulated and communicated to management, including the Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosures. Ambac management is committed to maintaining an effective internal control environment over financial reporting. Based on its evaluation, Ambac’s Chief Executive Officer and Chief Financial Officer have concluded that, as of March 31, 2018, Ambac’s disclosure controls and procedures were effective.

There were no changes in the Company’s internal control over financial reporting that occurred during the quarter ended March 31, 2018 that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II.    OTHER INFORMATION

Item 1.    Legal Proceedings

Please refer to Note 12. Commitments and Contingencies of the Unaudited Consolidated Financial Statements located in Part I, Item 1 in this Form 10-Q and Note 18. Commitments and Contingencies in Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for a discussion on legal proceedings against Ambac and its subsidiaries.

Item 1A.    Risk Factors

You should carefully consider the risk factors set forth in the “Risk Factors” section, Item 1A to Part I in our Annual Report on Form 10-K for the year ended December 31, 2017, which are hereby incorporated by reference. These important factors may cause our actual results to differ materially from those indicated by our forward-looking statements, including those contained in this report. Please also see the section entitled “Cautionary Statement Pursuant to the Private Securities Litigation Reform Act of 1995” in the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section of this quarterly report on Form 10-Q. There have been no material changes to the risk factors we have disclosed in the “Risk Factors” section of our aforementioned Annual Report on Form 10-K, other than as described below.

Changes to the Second Amended Plan of Rehabilitation could expose Ambac Assurance to Greater Risk of Loss

As described inNote 12. Commitments and Contingencies to the Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q, OCI has proposed modifying Section 6.13 of the Second Amended Plan of Rehabilitation. Section 6.13 provides that any default or event of default, actual or alleged relating to the Segregated Account, Ambac Assurance or any subsidiary thereof, under any agreement will be deemed not to have occurred or existed, and as to Segregated Account policies and transaction documents will be deemed to be cured, to the extent such default or event of default is, or is alleged to be caused by the Segregated Account rehabilitation. Section 6.13 further provides that to the extent such a default relating to Ambac Assurance or any subsidiary thereof has been or is declared by any court or other entity, such default is and will be deemed to be cured. OCI has requested the Rehabilitation Court to approve a modification to Section 6.13 that would limit the scope of this provision to defaults or alleged defaults related to policies formerly allocated to the Segregated Account. If such modification becomes effective, Ambac Assurance will no longer be able to rely on Section 6.13 of the

| Ambac Financial Group, Inc. 762018 First Quarter FORM 10-Q |

Second Amended Plan of Rehabilitation to defend against arguments that a default occurred with respect to policies in the General Account (i.e., not in the Segregated Account) due to the Segregated Account rehabilitation. While Ambac Assurance believes that no default occurred in the General Account due to the Segregated Account rehabilitation or for any other reason, we can provide no assurance that a court adjudicating the matter would rule in favor of Ambac Assurance on the matter. As described in Note 12. Commitments and Contingencies to the Consolidated Financial Statements, included in Part I, Item 1 in this Form 10-Q, one court issued an unfavorable ruling on this issue. As a result of this decision or other unfavorable rulings on the existence of a default due to the Segregated Account rehabilitation, Ambac Assurance may lose important rights, including rights to control creditor decisions (as described elsewhere in the “Risk Factors” section, Item 1A to Part I, in our Annual Report on Form 10-K for

the year ended December 31, 2017), which could expose Ambac Assurance to greater risks of loss. The risk of receiving such unfavorable decisions could increase as a result of OCI's proposed modification to Section 6.13 of the Second Amended Plan of Rehabilitation.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(a) Unregistered Sales of Equity Securities

None.

(b) Purchases of Equity Securities By the Issuer and Affiliated Purchasers

There following table summarized Ambac's activity of share purchases during the first quarter of 2018. When restricted stock unit awards issued by Ambac vest or settle, they become taxable compensation to employees. For certain awards, shared may be withheld to cover the employee's portion of withholding taxes. In the first quarter of 2018, Ambac purchased shares from employees that settled restricted stock units to meet employee tax withholdings.

	Total Shares Purchased (1)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plan (1)	Maximum Number of Shares That may Yet be Purchased Under the Plan
January 2018	—	$	—	—	—
February 2018	54,463	15.51		—	—
March 2018	11,933	15.09		—	—
First Quarter 2018	66,396	$	15.44	—	—

(1) There were no other repurchases of equity securities made during the three months ended March 31, 2018. Ambac does not have a stock repurchase program.

Warrants

On June 30, 2015, the Board of Directors of Ambac authorized the establishment of a warrant repurchase program that permits the repurchase of up to $10 million of warrants. On November 3, 2016, the Board of Directors of Ambac authorized a $10 million increase to the warrant repurchase program. As of March 31, 2018, Ambac had repurchased 985,331 warrants totaling $8.1 million leaving 4,053,476 warrants outstanding with an exercise price of $16.67 per share and expiration of April 30, 2023. The remaining aggregate authorization at March 31, 2018 is $11.9 million.

Item 3. Defaults Upon Senior Securities

None.

Item 4.    Mine Safety Disclosures

Not applicable.

Item 5.    Other Information

None.

| Ambac Financial Group, Inc. 772018 First Quarter FORM 10-Q |

Item 6.    Exhibits

Exhibit Number	Description
10.1+	Form of 2018 Restricted Stock Unit Award Agreement between Ambac Financial Group, Inc. and Messrs. LeBlanc, Trick and Ksenak.
10.2+	Form of 2018 Restricted Stock Unit Award Agreement between Ambac Financial Group, Inc. and Messrs. Barranco, Eisman, Reilly and Ms. Smith.
10.3+	Form of 2018 Performance Stock Unit Award Agreement between Ambac Financial Group, Inc. and Messrs. LeBlanc, Trick and Ksenak.
10.4+	Form of 2018 Performance Stock Unit Award Agreement between Ambac Financial Group, Inc. and Messrs. Barranco, Eisman, Reilly and Ms. Smith.
10.5+	Form of 2018 Deferred Stock Unit Award Agreement between Ambac Financial Group, Inc. and each of the Company’s executive officers.
12.1+	Computation of Ratio of Earnings to Fixed Charges.
31.1+	Certification of Chief Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) Promulgated under the Securities Exchange Act of 1934, as amended.
31.2+	Certification of Chief Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) Promulgated under the Securities Exchange Act of 1934, as amended.
32.1++	Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.
	+ Filed herewith. ++ Furnished herewith.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		AMBAC FINANCIAL GROUP, INC.
Dated:	May 9, 2018	By:	/S/ DAVID TRICK
		Name:	David Trick
		Title:	Chief Financial Officer and Treasurer (Duly Authorized Officer and Principal Financial Officer)

| Ambac Financial Group, Inc. 782018 First Quarter FORM 10-Q |

EX-10.1

Exhibit 10.1

AMBAC FINANCIAL GROUP, INC.

RESTRICTED STOCK UNIT AGREEMENT

FOR LONG-TERM INCENTIVE COMPENSATION AWARD

(Executive Officers with Employment Agreements)

Effective as of [Date], 2018 (the “Grant Date”), [Name] (the “Participant”) has been granted a Full Value Award under the Ambac Financial Group, Inc. Incentive Compensation Plan (the “Incentive Plan”) and in accordance with the Ambac Financial Group, Inc. Long-Term Incentive Compensation Plan (the “LTIP”), which is a subplan to the Incentive Plan, in the form of restricted stock units. In addition to the terms and conditions of the Incentive Plan and the LTIP, the Award shall be subject to the following terms and conditions (sometimes referred to as this “Agreement”).

1.Defined Terms. Capitalized terms used in this Agreement which are not otherwise defined herein shall have the meaning specified in the Incentive Plan or the LTIP, as applicable.

2.Grant of Restricted Stock Units. Subject to the terms of this Agreement, the Incentive Plan and the LTIP, effective as of the Grant Date the Participant is hereby granted [Number] restricted stock units (the “Restricted Stock Units”). This Award contains the right to dividend equivalent units (“Dividend Equivalent Units”) as described in Section 3. Each Restricted Stock Unit shall become vested as described in Section 4 and each vested Restricted Stock Unit shall be settled in accordance with Section 6.

3.Dividend Equivalent Units. The Participant shall be entitled to Dividend Equivalent Units in accordance with the following:

(a) If a dividend with respect to shares of Common Stock is payable in cash, then, as of the applicable dividend payment date, the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the cash dividend payable with respect to a share of Common Stock, multiplied by (ii) the number of Restricted Stock Units outstanding (i.e., the number of Restricted Stock Units granted hereunder less the number of such Restricted Stock Units that have settled in accordance with Section 6 below) on the applicable dividend record date plus the number of previously credited Dividend Equivalent Units with respect to such Restricted Stock Units, if any, divided by (iii) the Fair Market Value of a share of Common Stock on the dividend payment date.

If a dividend with respect to shares of Common Stock is payable in shares of Common Stock, then, as of the dividend payment date, the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the number of shares of Common Stock distributed in the dividend with respect to a share of Common Stock, multiplied by (ii) the number of Restricted Stock Units outstanding on the applicable dividend record date plus the number of previously credited Dividend Equivalent Units with respect to such Restricted Stock Units, if any.

Dividend Equivalent Units shall be subject to the same vesting provisions as the Restricted Stock Units to which they relate and shall be settled in accordance with Section 6.

4.Vesting and Forfeiture of Awards. All Restricted Stock Units and Dividend Equivalent Units shall be unvested unless and until they become vested and nonforfeitable in accordance with this Section 4. Subject to the Participant’s continuing service as an employee of Ambac Financial Group, Inc. (“Ambac”), or its subsidiaries, through the applicable vesting date, and the terms and conditions of this Agreement, the Incentive Plan and the LTIP, the Restricted Stock Units and associated Dividend Equivalent Units shall vest in three equal annual installments on March 2, 2019, March 2, 2020 and March 2, 2021. Except as provided in Section 5(a), if the Participant’s termination of employment with Ambac and its subsidiaries (the “Termination Date”) occurs for any reason prior to a vesting date, all Restricted Stock Units and associated Dividend Equivalent Units which are not vested upon the Participant’s Termination Date shall immediately expire and shall be forfeited and the Participant shall have no further rights with respect to such Restricted Stock Units or associated Dividend Equivalent Units.

5.Termination of Employment.

(a) Notwithstanding the provisions of Section 4, if the Participant’s Termination Date occurs due to death, Disability (as defined in Section 5(b)), involuntary termination by the Company other than for Cause (as defined in Section 5(b)), as a result of the Company’s failure to extend the term of the Employment Agreement between Ambac, AAC and the Participant, dated as of [DATE] (the “Employment Agreement”), pursuant to Section 2 thereof, termination by the Participant for Good Reason (as defined in Section 5(b)) or Retirement (as defined in Section 5(b)), all Restricted Stock Units and associated Dividend Equivalent Units shall vest upon the Participant’s Termination Date.

(b) For purposes of the Award evidenced by this Agreement, (i) the terms “Cause,” “Disability” and “Good Reason” shall have the meanings specified in the Employment Agreement, and (ii) the Participant’s Termination Date shall be considered to occur on account of Retirement if the Participant’s Termination Date occurs on or after the date on which the Participant has attained age 55 and such termination date does not occur for any other reason.

1

6.Settlement. Subject to the terms and conditions of this Agreement, Restricted Stock Units and associated Dividend Equivalent Units that have become vested in accordance with Sections 4 or 5 shall be settled as soon as practicable. Settlement of the vested Restricted Stock Units and associated Dividend Equivalent Units shall be made in the form of shares of Common Stock with one share of Common Stock being issued in settlement of each Restricted Stock Unit and associated Dividend Equivalent Unit (any fractional share being rounded up to the next whole unit). Upon the settlement of any vested Restricted Stock Units and Dividend Equivalent Units, such Restricted Stock Units and Dividend Equivalent Units shall be cancelled.

7.Withholding. All Awards and payments under this Agreement are subject to withholding of all applicable taxes. Such withholding obligations shall be satisfied through amounts that the Participant is otherwise to receive upon settlement.

8.Transferability. This Award is not transferable except as designated by the Participant by will or by the laws of descent and distribution.

9.Heirs and Successors. If any benefits deliverable to the Participant under this Agreement have not been delivered at the time of the Participant’s death, such rights shall be delivered to the Participant’s estate.

10.Administration. The authority to administer and interpret this Agreement shall be vested in the Committee, and the Committee shall have all the powers with respect to this Agreement as it has with respect to the Incentive Plan and the LTIP. Any interpretation of the Agreement by the Committee and any decision made by it with respect to the Agreement is final and binding on all persons.

11.Adjustment of Award. In the event of a stock dividend, stock split, reverse stock split, extraordinary cash dividend, recapitalization, reorganization, merger, consolidation, split-up, spin-off, exchange of shares, sale of assets or subsidiaries, combination, or other corporate transaction that affects the Common Stock, the Committee shall, in order to preserve the benefits or prevent the enlargement of benefits of this Award, and in the manner it determines equitable in its sole discretion, (a) adjust the number and kind of shares subject to this Award and (b) make any other adjustments that the Committee determines to be equitable (which may include, without limitation, (i) replacement of this Award with other Awards which the Committee determines have comparable value and which are based on stock of a company resulting from the transaction, and (ii) cancellation of this Award in return for cash payment of the current value of this Award, determined as though this Award is fully vested at the time of payment).

12.Notices. Any notice required or permitted under this Agreement shall be deemed given when delivered personally, through Ambac’s stock compensation administration system or when deposited in a United States Post Office, postage prepaid, addressed, as appropriate, to the Company at its principal offices, to the Participant at the Participant’s address as last known by the Company or, in either case, such other address as one party may designate in writing to the other.

13.Governing Law. The validity, construction and effect of this Agreement shall be determined in accordance with the laws of the State of New York and applicable federal law.

14.Amendments. The Board of Directors may, at any time, amend or terminate the Incentive Plan, and the Board of Directors or the Committee may amend this Agreement or the LTIP, provided that no amendment or termination may, in the absence of written consent to the change by the affected Participant (or, if the Participant is not then living, the affected beneficiary), adversely affect the rights of any Participant or beneficiary under this Agreement prior to the date such amendment or termination is adopted by the Board of Directors or the Committee, as the case may be.

15.Award Not Contract of Employment. The Award does not constitute a contract of employment or continued service, and the grant of the Award will not give the Participant the right to be retained in the employ or service of the Company or any Subsidiary, nor any right or claim to any benefit under the Incentive Plan, the LTIP or this Agreement, unless such right or claim has specifically accrued under the terms of the Incentive Plan and this Agreement.

16.Severability. If a provision of this Agreement is held invalid by a court of competent jurisdiction, the remaining provisions will nonetheless be enforceable according to their terms. Further, if any provision is held to be overbroad as written, that provision shall be amended to narrow its application to the extent necessary to make the provision enforceable according to applicable law and enforced as amended.

17.Incentive Plan and LTIP Govern. The Award evidenced by this Agreement is granted pursuant to the Incentive Plan, and the Restricted Stock Units, Dividend Equivalent Units and this Agreement are in all respects governed by the Incentive Plan (including the LTIP) and subject to all of the terms and provisions thereof, whether such terms and provisions are incorporated in this Agreement by reference or are expressly cited.

18.Special Section 409A Rules. To the fullest extent possible, amounts and other benefits payable under the Agreement are intended to comply with or be exempt from the provisions of section 409A of the Code. This Agreement will be interpreted and administered to the extent possible in a manner consistent with the foregoing statement of intent; provided, however, that the Company does not guarantee the tax treatment of the Award. Notwithstanding any other provision of this Agreement to the contrary, if any payment or benefit hereunder is subject to section 409A of the Code, and if such payment or benefit is to be paid or provided on account of the Participant’s termination of employment (or other separation from service):

(a) and if the Participant is a specified employee (within the meaning of section 409A(a)(2)(B) of the Code) and if any such payment or benefit is required to be made or provided prior to the first day of the seventh month following the Participant’s separation from

2

service or termination of employment, such payment or benefit shall be delayed until the first day of the seventh month following the Participant’s separation from service; and

(b) the determination as to whether the Participant has had a termination of employment (or separation from service) shall be made in accordance with the provisions of section 409A of the Code and the guidance issued thereunder without application of any alternative levels of reductions of bona fide services permitted thereunder.

___________________________________

Michael Reilly

Chief Administrative Officer

3

EX-10.2

Exhibit 10.2

AMBAC FINANCIAL GROUP, INC.

RESTRICTED STOCK UNIT AGREEMENT

FOR LONG-TERM INCENTIVE COMPENSATION AWARD

Effective as of [Date], 2018 (the “Grant Date”), [Name] (the “Participant”) has been granted a Full Value Award under the Ambac Financial Group, Inc. Incentive Compensation Plan (the “Incentive Plan”) and in accordance with the Ambac Financial Group, Inc. Long-Term Incentive Compensation Plan (the “LTIP”), which is a subplan to the Incentive Plan, in the form of restricted stock units. In addition to the terms and conditions of the Incentive Plan and the LTIP, the Award shall be subject to the following terms and conditions (sometimes referred to as this “Agreement”).

1.Defined Terms. Capitalized terms used in this Agreement which are not otherwise defined herein shall have the meaning specified in the Incentive Plan or the LTIP, as applicable.

2.Grant of Restricted Stock Units. Subject to the terms of this Agreement, the Incentive Plan and the LTIP, effective as of the Grant Date the Participant is hereby granted [Number] restricted stock units (the “Restricted Stock Units”). This Award contains the right to dividend equivalent units (“Dividend Equivalent Units”) as described in Section 3. Each Restricted Stock Unit shall become vested as described in Section 4 and each vested Restricted Stock Unit shall be settled in accordance with Section 6.

3.Dividend Equivalent Units. The Participant shall be entitled to Dividend Equivalent Units in accordance with the following:

(a) If a dividend with respect to shares of Common Stock is payable in cash, then, as of the applicable dividend payment date, the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the cash dividend payable with respect to a share of Common Stock, multiplied by (ii) the number of Restricted Stock Units outstanding (i.e., the number of Restricted Stock Units granted hereunder less the number of such Restricted Stock Units that have settled in accordance with Section 6 below) on the applicable dividend record date plus the number of previously credited Dividend Equivalent Units with respect to such Restricted Stock Units, if any, divided by (iii) the Fair Market Value of a share of Common Stock on the dividend payment date.

(b) If a dividend with respect to shares of Common Stock is payable in shares of Common Stock, then, as of the dividend payment date, the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the number of shares of Common Stock distributed in the dividend with respect to a share of Common Stock, multiplied by (ii) the number of Restricted Stock Units outstanding on the applicable dividend record date plus the number of previously credited Dividend Equivalent Units with respect to such Restricted Stock Units, if any.

Dividend Equivalent Units shall be subject to the same vesting provisions as the Restricted Stock Units to which they relate and shall be settled in accordance with Section 6.

4.Vesting and Forfeiture of Awards. All Restricted Stock Units and Dividend Equivalent Units shall be unvested unless and until they become vested and nonforfeitable in accordance with this Section 4. Subject to the Participant’s continuing service as an employee of Ambac Financial Group, Inc. (“Ambac”), or its subsidiaries, through the applicable vesting date, and the terms and conditions of this Agreement, the Incentive Plan and the LTIP, the Restricted Stock Units and associated Dividend Equivalent Units shall vest in three equal annual installments on March 2, 2019, March 2, 2020 and March 2, 2021. Except as provided in Section 5(a), if the Participant’s termination of employment with Ambac and its subsidiaries (the “Termination Date”) occurs for any reason prior to a vesting date, all Restricted Stock Units and associated Dividend Equivalent Units which are not vested upon the Participant’s Termination Date shall immediately expire and shall be forfeited and the Participant shall have no further rights with respect to such Restricted Stock Units or associated Dividend Equivalent Units.

5.Termination of Employment.

(a) Notwithstanding the provisions of Section 4, if the Participant’s Termination Date occurs on or after the six (6) month anniversary of the Grant Date by reason of death, Disability (as defined in Section 5(b)), involuntary termination by the Company other than for Cause (as defined in Section 5(b)), or Retirement (as defined in Section 5(b)), all Restricted Stock Units and associated Dividend Equivalent Units shall vest upon the Participant’s Termination Date.

(b) For purposes of the Award evidenced by this Agreement, (i) a Participant’s Termination Date shall be considered to occur by reason of Disability if his Termination Date occurs on or after the date on which he is entitled to long-term disability benefits under the Company’s long-term disability plan (or, if the Participant is not eligible for such plan, if the Participant would be entitled to benefits under such plan if he were eligible) and such Termination Date does not occur for any other reason, (ii) the Participant’s Termination Date shall be considered to occur by reason of Cause if the Participant’s Termination Date occurs by reason of termination by the Company and is on account of (A) any act or omission by the Participant resulting in, or intending to result in, personal gain at the expense of the Company; (B) the improper disclosure by the Participant of proprietary or confidential information of the Company; (C) misconduct by the Participant, including, but not limited to, fraud, intentional violation of, or negligent disregard for, the rules and procedures of the Company (including the code of business conduct), theft, violent acts or threats of violence, or possession of

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controlled substances on the property of the Company; or (D) poor performance or other reasons under which the Participant terminates not in good standing; provided, however, that the meaning of “Cause” shall be (1) expanded to include any additional grounds for cause-based termination specified in any contract, policy or plan applicable to the Participant or (2) superseded to the extent expressly provided in such contract, policy or plan, and (iii) the Participant’s Termination Date shall be considered to occur on account of Retirement if the Participant’s Termination Date occurs on or after the date on which the Participant has attained age 55 and such termination date does not occur for any other reason.

6.Settlement. Subject to the terms and conditions of this Agreement, Restricted Stock Units and associated Dividend Equivalent Units that have become vested in accordance with Sections 4 or 5 shall be settled as soon as practicable. Settlement of the vested Restricted Stock Units and associated Dividend Equivalent Units shall be made in the form of shares of Common Stock with one share of Common Stock being issued in settlement of each Restricted Stock Unit and associated Dividend Equivalent Unit (any fractional share being rounded up to the next whole unit). Upon the settlement of any vested Restricted Stock Units and Dividend Equivalent Units, such Restricted Stock Units and Dividend Equivalent Units shall be cancelled.

7.Withholding. All Awards and payments under this Agreement are subject to withholding of all applicable taxes. Such withholding obligations shall be satisfied through amounts that the Participant is otherwise to receive upon settlement.

8.Transferability. This Award is not transferable except as designated by the Participant by will or by the laws of descent and distribution.

9.Heirs and Successors. If any benefits deliverable to the Participant under this Agreement have not been delivered at the time of the Participant’s death, such rights shall be delivered to the Participant’s estate.

10.Administration. The authority to administer and interpret this Agreement shall be vested in the Committee, and the Committee shall have all the powers with respect to this Agreement as it has with respect to the Incentive Plan and the LTIP. Any interpretation of the Agreement by the Committee and any decision made by it with respect to the Agreement is final and binding on all persons.

11.Adjustment of Award. In the event of a stock dividend, stock split, reverse stock split, extraordinary cash dividend, recapitalization, reorganization, merger, consolidation, split-up, spin-off, exchange of shares, sale of assets or subsidiaries, combination, or other corporate transaction that affects the Common Stock, the Committee shall, in order to preserve the benefits or prevent the enlargement of benefits of this Award, and in the manner it determines equitable in its sole discretion, (a) adjust the number and kind of shares subject to this Award and (b) make any other adjustments that the Committee determines to be equitable (which may include, without limitation, (i) replacement of this Award with other Awards which the Committee determines have comparable value and which are based on stock of a company resulting from the transaction, and (ii) cancellation of this Award in return for cash payment of the current value of this Award, determined as though this Award is fully vested at the time of payment).

12.Notices. Any notice required or permitted under this Agreement shall be deemed given when delivered personally, through Ambac’s stock compensation administration system or when deposited in a United States Post Office, postage prepaid, addressed, as appropriate, to the Company at its principal offices, to the Participant at the Participant’s address as last known by the Company or, in either case, such other address as one party may designate in writing to the other.

13.Governing Law. The validity, construction and effect of this Agreement shall be determined in accordance with the laws of the State of New York and applicable federal law.

14.Amendments. The Board of Directors may, at any time, amend or terminate the Incentive Plan, and the Board of Directors or the Committee may amend this Agreement or the LTIP, provided that no amendment or termination may, in the absence of written consent to the change by the affected Participant (or, if the Participant is not then living, the affected beneficiary), adversely affect the rights of any Participant or beneficiary under this Agreement prior to the date such amendment or termination is adopted by the Board of Directors or the Committee, as the case may be.

15.Award Not Contract of Employment. The Award does not constitute a contract of employment or continued service, and the grant of the Award will not give the Participant the right to be retained in the employ or service of the Company or any Subsidiary, nor any right or claim to any benefit under the Incentive Plan, the LTIP or this Agreement, unless such right or claim has specifically accrued under the terms of the Incentive Plan and this Agreement.

16.Severability. If a provision of this Agreement is held invalid by a court of competent jurisdiction, the remaining provisions will nonetheless be enforceable according to their terms. Further, if any provision is held to be overbroad as written, that provision shall be amended to narrow its application to the extent necessary to make the provision enforceable according to applicable law and enforced as amended.

17.Incentive Plan and LTIP Govern. The Award evidenced by this Agreement is granted pursuant to the Incentive Plan, and the Restricted Stock Units, Dividend Equivalent Units and this Agreement are in all respects governed by the Incentive Plan (including the LTIP) and subject to all of the terms and provisions thereof, whether such terms and provisions are incorporated in this Agreement by reference or are expressly cited.

18.Special Section 409A Rules. To the fullest extent possible, amounts and other benefits payable under the Agreement are intended to comply with or be exempt from the provisions of section 409A of the Code. This Agreement will be interpreted and administered to the extent possible

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in a manner consistent with the foregoing statement of intent; provided, however, that the Company does not guarantee the tax treatment of the Award. Notwithstanding any other provision of this Agreement to the contrary, if any payment or benefit hereunder is subject to section 409A of the Code, and if such payment or benefit is to be paid or provided on account of the Participant’s termination of employment (or other separation from service):

(a) and if the Participant is a specified employee (within the meaning of section 409A(a)(2)(B) of the Code) and if any such payment or benefit is required to be made or provided prior to the first day of the seventh month following the Participant’s separation from service or termination of employment, such payment or benefit shall be delayed until the first day of the seventh month following the Participant’s separation from service; and

(b) the determination as to whether the Participant has had a termination of employment (or separation from service) shall be made in accordance with the provisions of section 409A of the Code and the guidance issued thereunder without application of any alternative levels of reductions of bona fide services permitted thereunder.

___________________________________

Michael Reilly

Chief Administrative Officer

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EX-10.3

Exhibit 10.3

AMBAC FINANCIAL GROUP, INC.

PERFORMANCE STOCK UNIT AGREEMENT

FOR LONG-TERM INCENTIVE COMPENSATION AWARD

(Executive Officers with Employment Agreements)

Effective as of [Date], 2018 (the “Grant Date”), [Name] (the “Participant”) has been granted an Award under the Ambac Financial Group, Inc. Incentive Compensation Plan (the “Incentive Plan”) and in accordance with the Ambac Financial Group, Inc. Long-Term Incentive Compensation Plan (the “LTIP”), which is a subplan to the Incentive Plan. This Agreement evidences the Award, which shall consist of a Full Value Award in the form of performance stock units (“Performance Stock Units”). In addition to the terms and conditions of the Incentive Plan and the LTIP, the Award shall be subject to the following terms and conditions (sometimes referred to as this “Agreement”).

1.Defined Terms. Capitalized terms used in this Agreement which are not otherwise defined herein shall have the meaning specified in the Incentive Plan or the LTIP, as applicable.

2.Grant of Performance Stock Units. Subject to the terms of this Agreement, the Incentive Plan and the LTIP, effective as of the Grant Date the Participant is hereby granted [Number] Performance Stock Units (the “Target Performance Units”). This Award contains the right to dividend equivalent units (“Dividend Equivalent Units”) with respect to Earned Performance Units (as defined in Section 3(a)) as described in Section 4. Each Performance Stock Unit awarded hereunder shall become earned and vested as described in Section 3 and each Earned Performance Unit (and associated Earned Dividend Equivalent Units thereon as described in Section 4) shall be settled in accordance with Section 5.

^3.Earning, Vesting and Forfeiture of Performance Stock Units. The Performance Stock Units shall become earned and vested in accordance with the following:

(a) All Performance Stock Units shall be unearned and unvested unless and until they become earned and vested and nonforfeitable in accordance with this Section 3. The Participant shall have the ability to earn between 0% and 200% of the Target Performance Units, as determined by the Committee, based on the continuing employment of the Participant during the period beginning on January 1, 2018 and ending on the December 31, 2020 (the “Performance Period”) and satisfaction of the Performance Goals set forth in Exhibit A hereto (which is incorporated into and forms part of this Agreement). Any Performance Stock Units granted pursuant to this Agreement that become earned in accordance with this Agreement shall be referred to herein as “Earned Performance Units”. Except as provided in Section 3(b), if the Participant’s termination of employment or service with the Company (the “Termination Date”) occurs for any reason prior to the last day of the Performance Period, the Participant’s right to all Performance Stock Units (and any associated Dividend Equivalent Units) awarded or credited to the Participant pursuant to this Agreement shall expire and be forfeited immediately and the Participant shall have no further rights with respect to any of the Performance Stock Units (or associated Dividend Equivalent Units). The Earned Performance Units (and any associated Earned Dividend Equivalent Units) shall be settled in accordance with Section 5 hereof.

(b) Notwithstanding the provisions of Section 3(a), if the Participant’s Termination Date occurs prior to the last day of the Performance Period by reason of death, Disability (as defined in Section 3(c)), involuntary termination by the Company other than for Cause (as defined in Section 3(c)), as a result of the Company’s failure to extend the term of the Employment Agreement between Ambac, AAC and the Participant, dated as of [Date] (the “Employment Agreement”), pursuant to Section 2 thereof, termination by the Participant for Good Reason (as defined in Section 3(c)) or Retirement (as defined in Section 3(c), the Participant (or, in the event of his death, his beneficiary) shall be entitled to receive the number of Earned Performance Units (and any associated Earned Dividend Equivalent Units) that the Participant would have been entitled to receive had his Termination Date not occurred prior to the end of the Performance Period based on actual satisfaction of the Performance Goals; pro-rated to reflect the Participant’s actual service plus twelve (12) months during the Performance Period; determined by a fraction, (i) the numerator of which is the number of days during the Performance Period prior to and including the Termination Date plus the number of days in the next twelve (12) months, and (ii) the denominator of which is the total number of days in the Performance Period. The pro-rated service period fraction shall not exceed 100%.

(c) For purposes of the Award evidenced by this Agreement, (i) the terms “Cause,” “Disability” and “Good Reason” shall have the meanings specified in the Employment Agreement, and (ii) the Participant’s Termination Date shall be considered to occur on account of Retirement if the Participant’s Termination Date occurs on or after the date on which the Participant has attained age 55 and such termination date does not occur for any other reason.

4.Dividend Equivalent Units. The Participant shall be credited with Dividend Equivalent Units as follows:

(a) If, during the Performance Period, a dividend with respect to shares of Common Stock is paid in cash, then as of the dividend payment date, the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the cash dividend paid with respect to a share of Common Stock, multiplied by (ii) 200% of the Target Performance Units (the “Maximum Performance Units”) plus the number of previously credited Dividend Equivalent Units with respect to such Performance Stock Units, if any, divided by (iii) the Fair Market Value of a share of Common Stock on the dividend payment date, rounded down to the nearest whole number.

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(b) If, during the Performance Period, a dividend with respect to shares of Common Stock is paid in shares of Common Stock, then as of the dividend payment date the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the number of shares of Common Stock distributed in the dividend with respect to a share of Common Stock, multiplied by (ii)(A) the number of Maximum Performance Units plus (B) the number of previously credited Dividend Equivalent Units with respect to such Performance Stock Units, if any, rounded down to the nearest whole number.

Dividend Equivalent Units shall be earned on the same basis and to the same extent that the Performance Stock Units to which they relate become Earned Performance Units. Therefore, the Participant shall only earn Dividend Equivalent Units with respect to Earned Performance Units and, to the extent that any Dividend Equivalent Units are credited to the Participant pursuant to this Section 4 and are not earned in accordance with this Agreement, they shall be forfeited and the Participant shall have no further rights with respect thereto under this Agreement or otherwise. Any Dividend Equivalent Units credited to the Participant pursuant to this Section 4 that become earned in accordance with this Agreement are sometimes referred to as “Earned Dividend Equivalent Units”.

5.Settlement. Subject to the terms and conditions of this Agreement, the Earned Performance Units (and associated Earned Dividend Equivalent Units) shall be settled as soon as practically possible, but not later than seventy-five (75) days following the end of the Performance Period (the “Settlement Date”). Settlement of the Earned Performance Units and Earned Dividend Equivalent Units on the Settlement Date shall be made in the form of shares of Common Stock with one share of Common Stock being issued in settlement of each Earned Performance Unit and each Earned Dividend Equivalent Unit, with any fractional shares of Common Stock being rounded up to the nearest whole number. Upon the settlement of any Earned Performance Unit and associated Earned Dividend Equivalent Units, such Earned Performance Unit and Earned Dividend Equivalent Units shall be cancelled. Any Performance Stock Units and associated Dividend Equivalent Units outstanding as of the last day of the Performance Period that do not become Earned Performance Units and associated Earned Dividend Equivalent Units shall be automatically cancelled as of the last day of the Performance Period.

6.Withholding. The Award and settlement thereof are subject to withholding of all applicable taxes. Such withholding obligations shall be satisfied through amounts that the Participant is otherwise to receive upon settlement.

7.Transferability. The Award is not transferable except as designated by the Participant by will or by the laws of descent and distribution.

8.Heirs and Successors. If any benefits deliverable to the Participant under this Agreement have not been delivered at the time of the Participant’s death, such rights shall be delivered to the Participant’s estate.

9.Administration. The authority to administer and interpret this Agreement shall be vested in the Committee, and the Committee shall have all the powers with respect to this Agreement as it has with respect to the Incentive Plan and the LTIP. Any interpretation of the Agreement by the Committee and any decision made by it with respect to the Agreement is final and binding on all persons.

10.Adjustment of Award. In the event of a stock dividend, stock split, reverse stock split, extraordinary cash dividend, recapitalization, reorganization, merger, consolidation, split-up, spin-off, exchange of shares, sale of assets or subsidiaries, combination, or other corporate transaction that affects the Common Stock, the Committee shall, in order to preserve the benefits or prevent the enlargement of benefits of this Award, and in the manner it determines equitable in its sole discretion, (a) adjust the number and kind of shares subject to this Award and (b) make any other adjustments that the Committee determines to be equitable (which may include, without limitation, (i) replacement of this Award with other Awards which the Committee determines have comparable value and which are based on stock of a company resulting from the transaction, and (ii) cancellation of this Award in return for cash payment of the current value of this Award, determined as though this Award is fully vested at the time of payment).

11.Notices. Any notice required or permitted under this Agreement shall be deemed given when delivered personally, through Ambac’s stock compensation administration system or when deposited in a United States Post Office, postage prepaid, addressed, as appropriate, to Ambac at its principal offices, to the Participant at the Participant’s address as last known by the Company or, in either case, such other address as one party may designate in writing to the other.

12.Governing Law. The validity, construction and effect of this Agreement shall be determined in accordance with the laws of the State of New York and applicable federal law.

13.Amendments. The Board of Directors may, at any time, amend or terminate the Incentive Plan, and the Board of Directors or the Committee may amend this Agreement or the LTIP, provided that no amendment or termination may, in the absence of written consent to the change by the affected Participant (or, if the Participant is not then living, the affected beneficiary), adversely affect the rights of any Participant or beneficiary under this Agreement prior to the date such amendment or termination is adopted by the Board of Directors or the Committee, as the case may be.

14.Award Not Contract of Employment. The Award does not constitute a contract of employment or continued service, and the grant of the Award will not give the Participant the right to be retained in the employ or service of the Company, nor any right or claim to any benefit under the Incentive Plan, the LTIP or this Agreement, unless such right or claim has specifically accrued under the terms of the Incentive Plan and this Agreement.

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15.Severability. If a provision of this Agreement is held invalid by a court of competent jurisdiction, the remaining provisions will nonetheless be enforceable according to their terms. Further, if any provision is held to be overbroad as written, that provision shall be amended to narrow its application to the extent necessary to make the provision enforceable according to applicable law and enforced as amended.

16.Incentive Plan and LTIP Govern. The Award evidenced by this Agreement is granted pursuant to the Incentive Plan, and the Performance Stock Units and this Agreement are in all respects governed by the Incentive Plan (including the LTIP) and subject to all of the terms and provisions thereof, whether such terms and provisions are incorporated in this Agreement by reference or are expressly cited.

17.Special Section 409A Rules. To the fullest extent possible, amounts and other benefits payable under the Agreement are intended to comply with or be exempt from the provisions of section 409A of the Code. This Agreement will be interpreted and administered to the extent possible in a manner consistent with the foregoing statement of intent; provided, however, that the Company does not guarantee the tax treatment of the Award. Notwithstanding any other provision of this Agreement to the contrary, if any payment or benefit hereunder is subject to section 409A of the Code, and if such payment or benefit is to be paid or provided on account of the Participant’s termination of employment (or other separation from service):

(a) and if the Participant is a specified employee (within the meaning of section 409A(a)(2)(B) of the Code) and if any such payment or benefit is required to be made or provided prior to the first day of the seventh month following the Participant’s separation from service or termination of employment, such payment or benefit shall be delayed until the first day of the seventh month following the Participant’s separation from service; and

(b) the determination as to whether the Participant has had a termination of employment (or separation from service) shall be made in accordance with the provisions of section 409A of the Code and the guidance issued thereunder without application of any alternative levels of reductions of bona fide services permitted thereunder.

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EXHIBIT A

PERFORMANCE GOALS

Weight of Award between AAC and AFG Performance:

AAC Percentage: 85%

AFG Percentage: 15%

Performance Goals

All AAC and AFG metrics are neutralized to the effects of changes to US GAAP

The Award evidenced by the Agreement shall be earned based on the satisfaction of the Performance Goals described in this Exhibit A determined based on the rating calculated pursuant to the following table:

		AAC		AFG
Rating	Payout Multiple	Adjusted Net Asset Value ($mm)	WLACC Outstanding ($bn)	Cumulative EBITDA ($mm)
1	2.00	$(300)	$15.50	$30
2	1.00	$(500)	$16.60	$17
3	0.00	$(650)	$18.80	$0

With respect to the AAC Performance Goal, the applicable rating shall be determined (i) 50% based on the Adjusted Net Asset Value and (ii) 50% based on WLACC Outstanding at the end of the Performance Period. Linear interpolation between payout multiples of Adjusted Net Asset Value and the WLACC Outstanding, as applicable, will result in a proportionate number of the Target Performance Units (and associated Dividend Equivalent Units) becoming Earned Performance Units (and Earned Dividend Equivalent Units).

With respect to the AFG Performance Goal, the applicable rating shall be determined based on Cumulative EBITDA over the performance period. Linear interpolation between payout multiples of Cumulative EBITDA will result in a proportionate number of the Target Performance Units (and associated Dividend Equivalent Units) becoming Earned Performance Units (and Earned Dividend Equivalent Units).

All metrics noted in this table shall be neutral to the effects of changes to US GAAP.

All determinations as to whether the Performance Goals have been satisfied will be determined by the Committee in accordance with the provisions of the LTIP, including Section 3(f) thereof.

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For purposes of the foregoing table, the following definitions shall apply:

AAC: Ambac Assurance Corporation.

WLACC Outstanding: The remaining net par outstanding for watch list and adversely classified credits as identified at the beginning of the Performance Period (“WLACC”) by AFG and its subsidiaries, including Ambac Assurance UK, Limited (“Ambac UK”). For purposes of this award, WLACC amounts will exclude new credits added during the Performance Period, including those through reinsurance recaptures. For non-U.S. exposures, the currency exchange rates to be used shall be those beginning on the first day of the Performance Period.

Adjusted Net Asset Value: The value determined by reducing Assets by Liabilities, determined as of the last day of the Performance Period. Additionally, Adjusted Net Asset Value will:

• neutralize the effects of claim payments, loss expense payments, advisor payments and the establishment of loss and loss expense reserves for credits that do not have a GCL, as defined below, at the beginning of the Performance Period;

• measure AAC’s foreign subsidiaries utilizing the foreign exchange rate at the beginning of the Performance Period;

• add back costs related to AAC restructuring or ongoing OCI oversight during performance period; and

• add back direct costs of risk remediation activities with respect to credits within WLACC.

AFG: Ambac Financial Group, Inc.

Assets: The sum of the following relating to the Included Entities: cash, invested assets at fair value (except for Ambac-insured investments which will be measured at amortized cost and excluding the Secured Note issued in 2018 in connection with AAC’s restructuring as it is included below in liabilities), loans, investment income due and accrued, net receivables (payables) for security sales (purchases), tax tolling payments or dividends made by AAC to AFG, cash and securities pledged as collateral to counterparties and other receivables.

Cumulative EBITDA: AFG’s earnings before interest, taxes, depreciation, amortization, and non-controlling interests (as determined under current US GAAP) through the Performance Period. This includes all of AFG’s subsidiaries excluding AAC and AAC’s subsidiaries. Cumulative EBITDA shall be adjusted for the effects of:

• advisor and deal/transaction related costs related to AFG and AAC capital and/or M&A transactions above or below budgeted amounts ⁽¹⁾;

• cost of post-employment guarantees;

• cost and impact of AAC and AFG share repurchase (direct and synthetic) ⁽²⁾;

• changes to Board fees and Board imposed expenses;

• litigation and defense costs and any potential litigation gains in excess of damages incurred;

• (cost)/benefit of performance based compensation (above) or below target amounts; and

• any other costs as determined in the sole discretion of the Board.

Included Entities: AAC and its subsidiaries, and may include any other entities that the Committee shall determine.

Liabilities: The sum of the following relating to the Included Entities: the present value of future probability weighted financial guarantee claims and CDS payments reduced by recoveries, including probability weighted estimated subrogation recoveries and reinsurance recoverables, using discount rates in accordance with GAAP (“GCL”), fair value of interest rate derivatives (prior to any AAC credit valuation adjustments), par value and accrued interest on all outstanding surplus notes of AAC (including junior surplus notes), par value and accrued interest on the Ambac Note and Tier 2 debt issued in 2018 in connection with AAC’s restructuring (net of par value and accrued interest on AAC’s holdings of the Secured Note), the liquidation value of outstanding preferred stock and the GAAP carrying value of RMBS secured borrowings. Liabilities will also include the par and accrued interest on any new debt obligations issued in the future.

¹⁾  EBITDA from new business operations during the performance period will be recognized net of any excluded advisor and/or deal costs incurred during such period.

²⁾  Cost to be calculated based on (i) the amount of capital allocated to share repurchase multiplied by (ii) LIBOR + the average spread earned on AFG investments from the time of such allocation through the end of the performance period. For the avoidance of doubt, gains or losses from repurchases are also excluded from the EBITDA calculation.

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EX-10.4

Exhibit 10.4

AMBAC FINANCIAL GROUP, INC.

PERFORMANCE STOCK UNIT AGREEMENT

FOR LONG-TERM INCENTIVE COMPENSATION AWARD

(Executive Officers without Employment Agreements)

Effective as of [Date], 2018 (the “Grant Date”), [Name] (the “Participant”) has been granted an Award under the Ambac Financial Group, Inc. Incentive Compensation Plan (the “Incentive Plan”) and in accordance with the Ambac Financial Group, Inc. Long-Term Incentive Compensation Plan (the “LTIP”), which is a subplan to the Incentive Plan. This Agreement evidences the Award, which shall consist of a Full Value Award in the form of performance stock units (“Performance Stock Units”). In addition to the terms and conditions of the Incentive Plan and the LTIP, the Award shall be subject to the following terms and conditions (sometimes referred to as this “Agreement”).

1.Defined Terms. Capitalized terms used in this Agreement which are not otherwise defined herein shall have the meaning specified in the Incentive Plan or the LTIP, as applicable.

2.Grant of Performance Stock Units. Subject to the terms of this Agreement, the Incentive Plan and the LTIP, effective as of the Grant Date the Participant is hereby granted [Number] Performance Stock Units (the “Target Performance Units”). This Award contains the right to dividend equivalent units (“Dividend Equivalent Units”) with respect to Earned Performance Units (as defined in Section 3(a)) as described in Section 4. Each Performance Stock Unit awarded hereunder shall become earned and vested as described in Section 3 and each Earned Performance Unit (and associated Earned Dividend Equivalent Units thereon as described in Section 4) shall be settled in accordance with Section 5.

^3.Earning, Vesting and Forfeiture of Performance Stock Units. The Performance Stock Units shall become earned and vested in accordance with the following:

(a) All Performance Stock Units shall be unearned and unvested unless and until they become earned and vested and nonforfeitable in accordance with this Section 3. The Participant shall have the ability to earn between 0% and 200% of the Target Performance Units, as determined by the Committee, based on the continuing employment of the Participant during the period beginning on January 1, 2018 and ending on the December 31, 2020 (the “Performance Period”) and satisfaction of the Performance Goals set forth in Exhibit A hereto (which is incorporated into and forms part of this Agreement). Any Performance Stock Units granted pursuant to this Agreement that become earned in accordance with this Agreement shall be referred to herein as “Earned Performance Units”. Except as provided in Section 3(b), if the Participant’s termination of employment or service with the Company (the “Termination Date”) occurs for any reason prior to the last day of the Performance Period, the Participant’s right to all Performance Stock Units (and any associated Dividend Equivalent Units) awarded or credited to the Participant pursuant to this Agreement shall expire and be forfeited immediately and the Participant shall have no further rights with respect to any of the Performance Stock Units (or associated Dividend Equivalent Units). The Earned Performance Units (and any associated Earned Dividend Equivalent Units) shall be settled in accordance with Section 5 hereof.

(b) Notwithstanding the provisions of Section 3(a), if the Participant’s Termination Date occurs on or after six months from the beginning of the Performance Period and prior to the last day of the Performance Period by reason of death, Disability (as defined in Section 3(c)), involuntary termination by the Company other than for Cause (as defined in Section 3(c)), or Retirement (as defined in Section 3(c), the Participant (or, in the event of his or her death, his or her beneficiary) shall be entitled to receive the number of Earned Performance Units (and any associated Earned Dividend Equivalent Units) that the Participant would have been entitled to receive had the Termination Date not occurred prior to the end of the Performance Period based on actual satisfaction of the Performance Goals; pro-rated to reflect the Participant’s actual service plus twelve (12) months during the Performance Period; determined by a fraction, (i) the numerator of which is the number of days during the Performance Period prior to and including the Termination Date plus the number of days in the next twelve (12) months, and (ii) the denominator of which is the total number of days in the Performance Period. The pro-rated service period fraction shall not exceed 100%.

(c) For purposes of the Award evidenced by this Agreement, (i) a Participant’s Termination Date shall be considered to occur by reason of Disability if his Termination Date occurs on or after the date on which he is entitled to long-term disability benefits under the Company’s long-term disability plan (or, if the Participant is not eligible for such plan, if the Participant would be entitled to benefits under such plan if he were eligible) and such Termination Date does not occur for any other reason, (ii) the Participant’s Termination Date shall be considered to occur by reason of Cause if the Participant’s Termination Date occurs by reason of termination by the Company and is on account of (A) any act or omission by the Participant resulting in, or intending to result in, personal gain at the expense of the Company; (B) the improper disclosure by the Participant of proprietary or confidential information of the Company; (C) misconduct by the Participant, including, but not limited to, fraud, intentional violation of, or negligent disregard for, the rules and procedures of the Company (including the code of business conduct), theft, violent acts or threats of violence, or possession of controlled substances on the property of the Company; or (D) poor performance or other reasons under which the Participant terminates not in good standing; provided, however, that the meaning of “Cause” shall be (1) expanded to include any additional grounds for cause-based termination specified in any contract, policy or plan applicable to the Participant or (2) superseded to the extent expressly provided in such contract, policy or plan, and (iii) the Participant’s Termination Date shall be considered to occur

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on account of Retirement if the Participant’s Termination Date occurs on or after the date on which the Participant has attained age 55 and such termination date does not occur for any other reason.

4.Dividend Equivalent Units. The Participant shall be credited with Dividend Equivalent Units as follows:

(a) If, during the Performance Period, a dividend with respect to shares of Common Stock is paid in cash, then as of the dividend payment date, the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the cash dividend paid with respect to a share of Common Stock, multiplied by (ii) 200% of the Target Performance Units (the “Maximum Performance Units”) plus the number of previously credited Dividend Equivalent Units with respect to such Performance Stock Units, if any, divided by (iii) the Fair Market Value of a share of Common Stock on the dividend payment date, rounded down to the nearest whole number.

(b) If, during the Performance Period, a dividend with respect to shares of Common Stock is paid in shares of Common Stock, then as of the dividend payment date the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the number of shares of Common Stock distributed in the dividend with respect to a share of Common Stock, multiplied by (ii)(A) the number of Maximum Performance Units plus (B) the number of previously credited Dividend Equivalent Units with respect to such Performance Stock Units, if any, rounded down to the nearest whole number.

Dividend Equivalent Units shall be earned on the same basis and to the same extent that the Performance Stock Units to which they relate become Earned Performance Units. Therefore, the Participant shall only earn Dividend Equivalent Units with respect to Earned Performance Units and, to the extent that any Dividend Equivalent Units are credited to the Participant pursuant to this Section 4 and are not earned in accordance with this Agreement, they shall be forfeited and the Participant shall have no further rights with respect thereto under this Agreement or otherwise. Any Dividend Equivalent Units credited to the Participant pursuant to this Section 4 that become earned in accordance with this Agreement are sometimes referred to as “Earned Dividend Equivalent Units”.

5.Settlement. Subject to the terms and conditions of this Agreement, the Earned Performance Units (and associated Earned Dividend Equivalent Units) shall be settled as soon as practically possible, but not later than seventy-five (75) days following the end of the Performance Period (the “Settlement Date”). Settlement of the Earned Performance Units and Earned Dividend Equivalent Units on the Settlement Date shall be made in the form of shares of Common Stock with one share of Common Stock being issued in settlement of each Earned Performance Unit and each Earned Dividend Equivalent Unit, with any fractional shares of Common Stock being rounded up to the nearest whole number. Upon the settlement of any Earned Performance Unit and associated Earned Dividend Equivalent Units, such Earned Performance Unit and Earned Dividend Equivalent Units shall be cancelled. Any Performance Stock Units and associated Dividend Equivalent Units outstanding as of the last day of the Performance Period that do not become Earned Performance Units and associated Earned Dividend Equivalent Units shall be automatically cancelled as of the last day of the Performance Period.

6.Withholding. The Award and settlement thereof are subject to withholding of all applicable taxes. Such withholding obligations shall be satisfied through amounts that the Participant is otherwise to receive upon settlement.

7.Transferability. The Award is not transferable except as designated by the Participant by will or by the laws of descent and distribution.

8.Heirs and Successors. If any benefits deliverable to the Participant under this Agreement have not been delivered at the time of the Participant’s death, such rights shall be delivered to the Participant’s estate.

9.Administration. The authority to administer and interpret this Agreement shall be vested in the Committee, and the Committee shall have all the powers with respect to this Agreement as it has with respect to the Incentive Plan and the LTIP. Any interpretation of the Agreement by the Committee and any decision made by it with respect to the Agreement is final and binding on all persons.

10.Adjustment of Award. In the event of a stock dividend, stock split, reverse stock split, extraordinary cash dividend, recapitalization, reorganization, merger, consolidation, split-up, spin-off, exchange of shares, sale of assets or subsidiaries, combination, or other corporate transaction that affects the Common Stock, the Committee shall, in order to preserve the benefits or prevent the enlargement of benefits of this Award, and in the manner it determines equitable in its sole discretion, (a) adjust the number and kind of shares subject to this Award and (b) make any other adjustments that the Committee determines to be equitable (which may include, without limitation, (i) replacement of this Award with other Awards which the Committee determines have comparable value and which are based on stock of a company resulting from the transaction, and (ii) cancellation of this Award in return for cash payment of the current value of this Award, determined as though this Award is fully vested at the time of payment).

11.Notices. Any notice required or permitted under this Agreement shall be deemed given when delivered personally, through Ambac’s stock compensation administration system or when deposited in a United States Post Office, postage prepaid, addressed, as appropriate, to Ambac at its principal offices, to the Participant at the Participant’s address as last known by the Company or, in either case, such other address as one party may designate in writing to the other.

12.Governing Law. The validity, construction and effect of this Agreement shall be determined in accordance with the laws of the State of New York and applicable federal law.

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13.Amendments. The Board of Directors may, at any time, amend or terminate the Incentive Plan, and the Board of Directors or the Committee may amend this Agreement or the LTIP, provided that no amendment or termination may, in the absence of written consent to the change by the affected Participant (or, if the Participant is not then living, the affected beneficiary), adversely affect the rights of any Participant or beneficiary under this Agreement prior to the date such amendment or termination is adopted by the Board of Directors or the Committee, as the case may be.

14.Award Not Contract of Employment. The Award does not constitute a contract of employment or continued service, and the grant of the Award will not give the Participant the right to be retained in the employ or service of the Company, nor any right or claim to any benefit under the Incentive Plan, the LTIP or this Agreement, unless such right or claim has specifically accrued under the terms of the Incentive Plan and this Agreement.

15.Severability. If a provision of this Agreement is held invalid by a court of competent jurisdiction, the remaining provisions will nonetheless be enforceable according to their terms. Further, if any provision is held to be overbroad as written, that provision shall be amended to narrow its application to the extent necessary to make the provision enforceable according to applicable law and enforced as amended.

16.Incentive Plan and LTIP Govern. The Award evidenced by this Agreement is granted pursuant to the Incentive Plan, and the Performance Stock Units and this Agreement are in all respects governed by the Incentive Plan (including the LTIP) and subject to all of the terms and provisions thereof, whether such terms and provisions are incorporated in this Agreement by reference or are expressly cited.

17.Special Section 409A Rules. To the fullest extent possible, amounts and other benefits payable under the Agreement are intended to comply with or be exempt from the provisions of section 409A of the Code. This Agreement will be interpreted and administered to the extent possible in a manner consistent with the foregoing statement of intent; provided, however, that the Company does not guarantee the tax treatment of the Award. Notwithstanding any other provision of this Agreement to the contrary, if any payment or benefit hereunder is subject to section 409A of the Code, and if such payment or benefit is to be paid or provided on account of the Participant’s termination of employment (or other separation from service):

(a) and if the Participant is a specified employee (within the meaning of section 409A(a)(2)(B) of the Code) and if any such payment or benefit is required to be made or provided prior to the first day of the seventh month following the Participant’s separation from service or termination of employment, such payment or benefit shall be delayed until the first day of the seventh month following the Participant’s separation from service; and

(b) the determination as to whether the Participant has had a termination of employment (or separation from service) shall be made in accordance with the provisions of section 409A of the Code and the guidance issued thereunder without application of any alternative levels of reductions of bona fide services permitted thereunder.

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EXHIBIT A

PERFORMANCE GOALS

Weight of Award between AAC and AFG Performance:

AAC Percentage: 85%

AFG Percentage: 15%

Performance Goals

All AAC and AFG metrics are neutralized to the effects of changes to US GAAP

The Award evidenced by the Agreement shall be earned based on the satisfaction of the Performance Goals described in this Exhibit A determined based on the rating calculated pursuant to the following table:

		AAC		AFG
Rating	Payout Multiple	Adjusted Net Asset Value ($mm)	WLACC Outstanding ($bn)	Cumulative EBITDA ($mm)
1	2.00	$(300)	$15.50	$30
2	1.00	$(500)	$16.60	$17
3	0.00	$(650)	$18.80	$0

With respect to the AAC Performance Goal, the applicable rating shall be determined (i) 50% based on the Adjusted Net Asset Value and (ii) 50% based on WLACC Outstanding at the end of the Performance Period. Linear interpolation between payout multiples of Adjusted Net Asset Value and the WLACC Outstanding, as applicable, will result in a proportionate number of the Target Performance Units (and associated Dividend Equivalent Units) becoming Earned Performance Units (and Earned Dividend Equivalent Units).

With respect to the AFG Performance Goal, the applicable rating shall be determined based on Cumulative EBITDA over the performance period. Linear interpolation between payout multiples of Cumulative EBITDA will result in a proportionate number of the Target Performance Units (and associated Dividend Equivalent Units) becoming Earned Performance Units (and Earned Dividend Equivalent Units).

All metrics noted in this table shall be neutral to the effects of changes to US GAAP.

All determinations as to whether the Performance Goals have been satisfied will be determined by the Committee in accordance with the provisions of the LTIP, including Section 3(f) thereof.

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For purposes of the foregoing table, the following definitions shall apply:

AAC: Ambac Assurance Corporation.

WLACC Outstanding: The remaining net par outstanding for watch list and adversely classified credits as identified at the beginning of the Performance Period (“WLACC”) by AFG and its subsidiaries, including Ambac Assurance UK, Limited (“Ambac UK”). For purposes of this award, WLACC amounts will exclude new credits added during the Performance Period, including those through reinsurance recaptures. For non-U.S. exposures, the currency exchange rates to be used shall be those beginning on the first day of the Performance Period.

Adjusted Net Asset Value: The value determined by reducing Assets by Liabilities, determined as of the last day of the Performance Period. Additionally, Adjusted Net Asset Value will:

• neutralize the effects of claim payments, loss expense payments, advisor payments and the establishment of loss and loss expense reserves for credits that do not have a GCL, as defined below, at the beginning of the Performance Period;

• measure AAC’s foreign subsidiaries utilizing the foreign exchange rate at the beginning of the Performance Period;

• add back costs related to AAC restructuring or ongoing OCI oversight during performance period; and

• add back direct costs of risk remediation activities with respect to credits within WLACC.

AFG: Ambac Financial Group, Inc.

Assets: The sum of the following relating to the Included Entities: cash, invested assets at fair value (except for Ambac-insured investments which will be measured at amortized cost and excluding the Secured Note issued in 2018 in connection with AAC’s restructuring as it is included below in liabilities), loans, investment income due and accrued, net receivables (payables) for security sales (purchases), tax tolling payments or dividends made by AAC to AFG, cash and securities pledged as collateral to counterparties and other receivables.

Cumulative EBITDA: AFG’s earnings before interest, taxes, depreciation, amortization, and non-controlling interests (as determined under current US GAAP) through the Performance Period. This includes all of AFG’s subsidiaries excluding AAC and AAC’s subsidiaries. Cumulative EBITDA shall be adjusted for the effects of:

• advisor and deal/transaction related costs related to AFG and AAC capital and/or M&A transactions above or below budgeted amounts ⁽¹⁾;

• cost of post-employment guarantees;

• cost and impact of AAC and AFG share repurchase (direct and synthetic) ⁽²⁾;

• changes to Board fees and Board imposed expenses;

• litigation and defense costs and any potential litigation gains in excess of damages incurred;

• (cost)/benefit of performance based compensation (above) or below target amounts; and

• any other costs as determined in the sole discretion of the Board.

¹⁾  EBITDA from new business operations during the performance period will be recognized net of any excluded advisor and/or deal costs incurred during such period.

²⁾  Cost to be calculated based on (i) the amount of capital allocated to share repurchase multiplied by (ii) LIBOR + the average spread earned on AFG investments from the time of such allocation through the end of the performance period. For the avoidance of doubt, gains or losses from repurchases are also excluded from the EBITDA calculation.

Included Entities: AAC and its subsidiaries, and may include any other entities that the Committee shall determine.

Liabilities: The sum of the following relating to the Included Entities: the present value of future probability weighted financial guarantee claims and CDS payments reduced by recoveries, including probability weighted estimated subrogation recoveries and reinsurance recoverables, using discount rates in accordance with GAAP (“GCL”), fair value of interest rate derivatives (prior to any AAC credit valuation adjustments), par value and accrued interest on all outstanding surplus notes of AAC (including junior surplus notes), par value and accrued interest on the Ambac Note and Tier 2 debt issued in 2018 in connection with AAC’s restructuring (net of par value and accrued interest on AAC’s holdings of the Secured Note), the liquidation value of outstanding preferred stock and the GAAP carrying value of RMBS secured borrowings. Liabilities will also include the par and accrued interest on any new debt obligations issued in the future.

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EX-10.5

Exhibit 10.5

AMBAC FINANCIAL GROUP, INC.
DEFERRED SHARE UNIT AGREEMENT

[Name] (the “Participant”) has been granted a Full Value Award under the Ambac Financial Group, Inc. Incentive Compensation Plan (the “Plan”) in the form of deferred share units (the “Award”). The Award shall be effective as of [DATE] (the “Grant Date”). The Award shall be subject to the following terms and conditions (sometimes referred to as this “Agreement”).

1.Defined Terms. Capitalized terms used in this Agreement which are not otherwise defined herein shall have the meaning specified in the Plan.

2.Grant of Deferred Share Units. Subject to the terms of this Agreement and the Plan, effective as of the Grant Date the Participant is hereby granted [Number] deferred share units (the “Deferred Share Units”). This Award contains the right to dividend equivalent units (“Dividend Equivalent Units”) as described in Section 3. Each Deferred Share Unit shall become vested as described in Section 4 and each vested Deferred Share Unit shall be settled in accordance with Section 5.

3.Dividend Equivalent Units. The Participant shall be entitled to Dividend Equivalent Units in accordance with the following:

(a) If a dividend with respect to shares of Common Stock is payable in cash, then, as of the applicable dividend payment date, the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the cash dividend payable with respect to a share of Common Stock, multiplied by (ii) the number of Deferred Share Units outstanding (i.e., the number of Deferred Share Units granted hereunder less the number of such Deferred Share Units that have settled in accordance with Section 5 below) on the applicable dividend record date, divided by (iii) the Fair Market Value of a share of Common Stock on the dividend payment date, rounded down to the nearest whole number.

(b) If a dividend with respect to shares of Common Stock is payable in shares of Common Stock, then, as of the dividend payment date, the Participant shall be credited with that number of Dividend Equivalent Units equal to (i) the number of shares Common Stock distributed in the dividend with respect to a share of Common Stock, multiplied by (ii) the number of Deferred Share Units outstanding on the applicable dividend record date, rounded down to the nearest whole number.

Dividend Equivalent Units shall be settled in accordance with Section 5. No Dividend Equivalent Units shall be credited with respect to previously credited Dividend Equivalent Units.

4.Vesting of Deferred Share Units and Dividend Equivalent Units.All Deferred Share Units shall be fully vested as of the Grant Date. Dividend Equivalent Units shall be fully vested as of the related dividend record date.

5.Settlement. Subject to the terms and conditions of this Agreement, (a) one-half (1/2) of the Deferred Share Units and associated Dividend Equivalent Units shall be settled on the first anniversary of the Grant Date or, if such day is not a business day, on the first business day thereafter, and (b) one-half (1/2) of the Deferred Share Units and associated Dividend Equivalent Units shall be settled on the second anniversary of the Grant Date or, if such day is not a business day, on the first business day thereafter; provided, however, that if the Participant’s employment with Ambac Financial Group, Inc. (the “Company”) and its Subsidiaries terminates for any reason prior to the second anniversary of the Grant Date, then all of the then outstanding Deferred Share Units and associated Dividend Equivalents Units shall be settled as soon as practicable (but no later than thirty (30) days) following such termination of employment. The date on which settlement occurs is referred to as the “Settlement Date”. Settlement of the Deferred Share Units and associated Dividend Equivalent Units on a Settlement Date shall be made in the form of shares of Common Stock with one share of Common Stock being issued in settlement of each Deferred Share Unit and associated Dividend Equivalent Unit (any fractional share being rounded up to the next whole unit). Upon the settlement of any Deferred Share Units and Dividend Equivalent Units, such Deferred Share Units and Dividend Equivalent Units shall be cancelled.

6.Withholding. All Awards and payments under this Agreement are subject to withholding of all applicable taxes. Such withholding obligations shall be satisfied through amounts that the Participant is otherwise entitled to receive upon settlement of this Award. Notwithstanding the foregoing, if a tax withholding obligation with respect to tax imposed under the Federal Insurance Contributions Act (FICA) under sections 3101, 3121(a) and 3121(v)(2) of the Code (the “FICA Obligations”) is incurred with respect to any of the Deferred Share Units and associated Dividend Equivalent Units prior to the Settlement Date with respect to such Deferred Share Units and associated Dividend Equivalent Units (each date on which the FICA Obligation arises being referred to herein as a “Tax Vesting Date”) then, on the applicable Tax Vesting Date, that number of Deferred Share Units and associated Dividend Equivalent Units for which the Settlement Date has not occurred as of the Tax Vesting Date shall be settled with respect to that number of shares of Common Stock subject thereto having a Fair Market Value (determined as of the Tax Vesting Date) equal to the sum of the following:

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(a) the FICA Obligations;

(b) the income tax imposed by section 3401 of the Code (or the corresponding withholding provisions of applicable state, local or foreign tax laws) as a result of the FICA Obligations; and

(c) the amount necessary to pay the additional income tax on wages attributable to the pyramiding of the payments under subparagraphs 6(a) and (b).

In no event shall the value of the Deferred Share Units and associated Dividend Equivalent Units that are settled pursuant to subparagraphs 6(a), (b) and (c) exceed the amount that could be distributed pursuant to Treas. Reg. § 1.409A-3(j)(4)(vi).

7.Transferability. This Award is not transferable except as designated by the Participant by will or by the laws of descent and distribution.

8.Heirs and Successors. If any benefits deliverable to the Participant under this Agreement have not been delivered at the time of the Participant’s death, such rights shall be delivered to the Participant’s estate.

9.Administration. The authority to administer and interpret this Agreement shall be vested in the Committee, and the Committee shall have all the powers with respect to this Agreement as it has with respect to the Plan. Any interpretation of the Agreement by the Committee and any decision made by it with respect to the Agreement is final and binding on all persons.

10.Adjustment of Award. In the event of a stock dividend, stock split, reverse stock split, extraordinary cash dividend, recapitalization, reorganization, merger, consolidation, split-up, spin-off, exchange of shares, sale of assets or subsidiaries, combination, or other corporate transaction that affects the Common Stock, the Committee shall, in order to preserve the benefits or prevent the enlargement of benefits of this Award, and in the manner it determines equitable in its sole discretion, (a) adjust the number and kind of shares subject to this Award and (b) make any other adjustments that the Committee determines to be equitable (which may include, without limitation, (i) replacement of this Award with other Awards which the Committee determines have comparable value and which are based on stock of a company resulting from the transaction, and (ii) cancellation of this Award in return for cash payment of the current value of this Award, determined as though this Award is fully vested at the time of payment).

11.Notices. Any notice required or permitted under this Agreement shall be deemed given when delivered personally or through Ambac’s stock compensation administration system, or when deposited in a United States Post Office, postage prepaid, addressed, as appropriate, to the Company at its principal offices, to the Participant at the Participant’s address as last known by the Company or, in either case, such other address as one party may designate in writing to the other.

12.Governing Law. The validity, construction and effect of this Agreement shall be determined in accordance with the laws of the State of New York and applicable federal law.

13.Amendments. The Board may, at any time, amend or terminate the Plan, and the Board or the Committee may amend this Agreement, provided that no amendment or termination may, in the absence of written consent to the change by the affected Participant (or, if the Participant is not then living, the affected beneficiary), adversely affect the rights of any Participant or beneficiary under this Agreement prior to the date such amendment or termination is adopted by the Board or the Committee, as the case may be.

14.Award Not Contract of Employment. The Award does not constitute a contract of employment or continued service, and the grant of the Award will not give the Participant the right to be retained in the employ or service of the Company or any Subsidiary, nor any right or claim to any benefit under the Plan or this Agreement, unless such right or claim has specifically accrued under the terms of the Plan and this Agreement.

15.Severability. If a provision of this Agreement is held invalid by a court of competent jurisdiction, the remaining provisions will nonetheless be enforceable according to their terms. Further, if any provision is held to be overbroad as written, that provision shall be amended to narrow its application to the extent necessary to make the provision enforceable according to applicable law and enforced as amended.

16.Plan Governs. The Award evidenced by this Agreement is granted pursuant to the Plan, and the Deferred Share Units, Dividend Equivalent Units and this Agreement are in all respects governed by the Plan and subject to all of the terms and provisions thereof, whether such terms and provisions are incorporated in this Agreement by reference or are expressly cited.

17.Special Section 409A Rules. To the fullest extent possible, amounts and other benefits payable under this Agreement are intended to comply with or be exempt from the provisions of section 409A of the Code. This Agreement will be interpreted and administered to the extent possible in a manner consistent with the foregoing statement of intent; provided, however, that the Company does not guarantee the tax treatment of the Award.

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Notwithstanding any other provision of this Agreement to the contrary, if any payment or benefit hereunder is subject to section 409A of the Code, and if such payment or benefit is to be paid or provided on account of the Participant’s termination of employment (or other separation from service):

(a) and if the Participant is a specified employee (within the meaning of section 409A(a)(2)(B) of the Code) and if any such payment or benefit is required to be made or provided prior to the first day of the seventh month following the Participant’s separation from service or termination of employment, such payment or benefit shall be delayed until the first day of the seventh month following the Participant’s separation from service (or, if earlier, upon the Participant’s death);

(b) the determination as to whether the Participant has had a termination of employment (or separation from service) shall be made in accordance with the provisions of section 409A of the Code and the guidance issued thereunder without application of any alternative levels of reductions of bona fide services permitted thereunder; and

(c) for purposes of section 409A of the Code, the Participant’s right to receive any installment payments pursuant to this Agreement shall be treated as a right to receive a series of separate and distinct payments.

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EX-12.1

Exhibit 12.1

AMBAC FINANCIAL GROUP, INC.

RATIOS OF EARNINGS TO FIXED CHARGES

	Three Months Ended March 31, 2018
							Year Ended December 31,
($ in thousands, except ratios)				2017			2016			2015			2014
Earnings:
Pre-tax income (loss)	$	308,309		$	(284,251	)	$	105,026		$	510,058		$	493,253
Fixed Charges	47,866			114,306			119,503			115,016			127,754
Earnings	$	356,175		$	(169,945	)	$	224,529		$	625,074		$	621,007
Fixed charges:
Interest expense	$	47,300		$	113,400		$	118,500		$	113,100		$	125,891
Portion of rental expense deemed to be interest	566			906			1,003			1,916			1,863
Fixed charges	$	47,866		$	114,306		$	119,503		$	115,016		$	127,754
Ratio of earnings to fixed charges	7.4		x	*			1.9		x	5.4		x	4.9		x

* Earnings were inadequate to cover fixed charges by $284,251 for the year ended December 31, 2017.

EX-31.1

EXHIBIT 31.1

Ambac Financial Group, Inc.

Certifications

I, Claude LeBlanc, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Ambac Financial Group, Inc. (the "registrant");

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a—15(e) and 15d—15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated:	May 9, 2018	By:	/s/ Claude LeBlanc
			Claude LeBlanc President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

Ambac Financial Group, Inc.

Certifications

I, David Trick, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Ambac Financial Group, Inc. (the"registrant");

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a—15(e) and 15d—15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated:	May 9, 2018	By:	/s/ David Trick
			David Trick Chief Financial Officer and Treasurer

EX-32.1

EXHIBIT 32

Certification of Chief Executive Officer and Chief Financial Officer

Pursuant to 18 U.S.C. Section 1350,

as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of Ambac Financial Group, Inc. (the “Company”) on Form 10-Q for the period ended March 31, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), we, Claude LeBlanc, Chief Executive Officer of the Company, and David Trick, Chief Financial Officer of the Company, hereby certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of their knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

By:	/s/ Claude LeBlanc
Name:	Claude LeBlanc
Title:	President and Chief Executive Officer

		By:	/s/ David Trick
		Name:	David Trick
		Title:	Chief Financial Officer and Treasurer
Dated:	May 9, 2018

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 07, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	AMBC
Entity Registrant Name	AMBAC FINANCIAL GROUP INC
Entity Central Index Key	0000874501
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		45,327,179

XML

Consolidated Balance Sheets - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Fixed income securities, at fair value (amortized cost of $3,713,908 and $4,614,623)	$ 3,871,938	$ 4,652,172
Fixed income securities pledged as collateral, at fair value (amortized cost of $84,240 and $99,719)	84,240	99,719
Short-term investments, at fair value (amortized cost of $321,210 and $557,476)	321,119	557,270
Other investments	419,896	431,630
Total investments	4,697,193	5,740,791
Cash and cash equivalents	38,485	623,703
Receivable for securities	2,376	11,177
Investment income due and accrued	20,457	16,532
Premium receivables	580,707	586,312
Reinsurance recoverable on paid and unpaid losses	38,825	40,997
Deferred ceded premium	49,631	52,195
Subrogation recoverable	1,894,778	631,213
Loans	10,643	10,358
Derivative assets	60,196	73,199
Income Taxes Receivable	20,180	11,803
Insurance intangible asset	833,040	846,973
Other assets	36,332	46,614
Total assets	22,847,966	23,192,374
Liabilities:
Unearned premiums	762,240	783,155
Loss and loss expense reserves	2,139,101	4,745,015
Ceded premiums payable	36,451	37,876
Long-term debt	2,957,732	991,696
Accrued interest payable	244,199	436,984
Derivative Liability	71,584	82,782
Other liabilities	55,209	67,583
Payable for securities purchased	8,849	1,932
Total liabilities	20,738,801	21,547,116
Stockholders’ equity:
Preferred stock, par value $0.01 per share; 20,000,000 shares authorized; issued and outstanding shares—none	0	0
Common Stock, Value, Issued	454	453
Additional paid-in capital	204,172	199,560
Accumulated other comprehensive income	99,476	(52,239)
Retained earnings	1,541,464	1,233,845
Treasury stock, shares at cost: 0 and 8,202	(511)	(471)
Total Ambac Financial Group, Inc. stockholders’ equity	1,845,055	1,381,148
Noncontrolling interest	264,110	264,110
Total stockholders’ equity	2,109,165	1,645,258
Total liabilities and stockholders’ equity	22,847,966	23,192,374
Deferred Income Tax Liabilities, Net	34,804	33,659
Variable Interest Entity, Primary Beneficiary [Member]
Assets:
Fixed income securities, at fair value (amortized cost of $3,713,908 and $4,614,623)	2,955,763	2,914,145
Restricted cash	1,134	978
Loans	11,558,331	11,529,384
Derivative assets	46,260	54,877
Other assets	3,635	1,123
Liabilities:
Long-term debt	12,270,124	12,160,544
Accrued interest payable	3,005	589
Derivative Liability	2,155,456	2,205,264
Other liabilities	$ 47	$ 37

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Consolidated Balance Sheets (Parenthetical) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fixed income securities, amortized cost	$ 3,713,908	$ 4,614,623
Fixed income securities pledged as collateral, amortized cost	84,240	99,719
Short-term investments, amortized cost	$ 321,210	$ 557,476
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	130,000,000	130,000,000
Equity investments in pooled funds [Member]
Other Investments at Fair Value	$ 383,687	$ 396,689
Parent Company [Member]
Common stock, shares issued	45,365,170	45,275,982
Common stock, shares outstanding	45,365,170	45,275,982
Treasury stock, shares	32,956	24,816

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Consolidated Statements of Total Comprehensive Income - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Net premiums earned	$ 30,883	$ 47,613
Net investment income:
Securities available-for-sale and short-term	110,551	73,150
Other investments	(311)	8,409
Total net investment income	110,240	81,559
Other-than-temporary impairment losses:
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	(341)	(21,154)
Portion of other-than-temporary impairment recognized in other comprehensive income	42	17,212
Net other-than-temporary impairments	(299)	(3,942)
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	4,862	(4,896)
Change in fair value of credit derivatives:
Gain (Loss) on Sale of Derivatives	106	199
Unrealized gains (losses)	(452)	853
Net change in fair value of credit derivatives	(346)	1,052
Net gains (losses) on interest rate derivatives	25,537	(1,514)
Net realized gains (losses) on extinguishment of debt	3,115	2,741
Other Operating Income (Expense), Net	(509)	58
Income (loss) on variable interest entities	574	3,701
Total revenues	174,057	126,372
Expenses:
Losses and loss expenses (benefit)	(247,395)	135,011
Insurance intangible amortization	28,636	37,525
Operating expenses	36,434	28,124
Interest expense	48,073	31,572
Total expenses	(134,252)	232,232
Pre-tax income (loss)	308,309	(105,860)
Provision for income taxes	2,605	19,581
Net income (loss)	305,704	(125,441)
Net income (loss) attributable to common stockholders	305,704	(125,441)
Other comprehensive income (loss), after tax:
Net income (loss)	305,704	(125,441)
Unrealized gains (losses) on securities, net of income tax provision (benefit) of ($1,708) and $0	122,304	21,335
Gains (losses) on foreign currency translation, net of income tax provision of $0 and $0	32,056	12,593
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax	1,114
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax and Reclassification Adjustment, Attributable to Parent		0
Changes to postretirement benefit, net of income tax of $0 and $0	(859)	2,287
Total other comprehensive income (loss), net of income tax	154,615	36,215
Total comprehensive income (loss)	460,319	(89,226)
Less: comprehensive (gain) loss attributable to the noncontrolling interest:
Total comprehensive income (loss) attributable to Ambac Financial Group, Inc.	$ 460,319	$ (89,226)
Earnings Per Share, Basic	$ 6.72	$ (2.77)
Earnings Per Share, Diluted	$ 6.70	$ (2.77)

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Consolidated Statements of Total Comprehensive Income (Parenthetical) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Unrealized (loss) gain on securities, taxes	$ (1,708)	$ 0
Gain (loss) on foreign currency translation, taxes	0	0
Amortization of postretirement benefit, taxes	0	0
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, Tax	$ 230	$ 0

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Consolidated Statements of Stockholders' Equity - Successor [Member] - USD ($) $ in Thousands	Total	Retained Earnings/Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Common Stock Held in Treasury, at Cost [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2016	$ 1,978,024	$ 1,557,681	$ (38,990)	$ 0	$ 452	$ 195,267	$ (496)	$ 264,110
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	(89,226)	(125,441)	36,215	0	0	0	0	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-09 [Member]	(137)	(137)	0	0	0	0	0	0
Stock-based compensation	1,521	0	0	0	0	1,521	0	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(1,267)	(706)	0	0	0	0	(561)	0
Stock Issued During Period, Value, New Issues	1	0	0	0	1	0	0	0
Ending balance at Mar. 31, 2017	1,888,916	1,431,397	(2,775)	0	453	196,788	(1,057)	264,110
Beginning balance at Dec. 31, 2017	1,645,258	1,233,845	(52,239)	0	453	199,560	(471)	264,110
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	460,319	305,704	154,615	0	0	0	0	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-09 [Member]	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-01 [Member]		2,900	(2,900)	0	0	0	0	0
Stock-based compensation	4,612	0	0	0	0	4,612	0	0
Warrants Purchased During Period Dollars	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(1,025)	(985)	0	0	0	0	(40)	0
Stock Issued During Period, Value, New Issues	1	0	0	0	1	0	0	0
Payments for Repurchase of Warrants	8,092
Ending balance at Mar. 31, 2018	$ 2,109,165	$ 1,541,464	$ 99,476	$ 0	$ 454	$ 204,172	$ (511)	$ 264,110

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Consolidated Statements of Cash Flows - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 39,619	$ 123,777
Cash flows from operating activities:
Net income attributable to common shareholders	305,704	(125,441)
Net income (loss)	305,704	(125,441)
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	181	270
Amortization of bond premium and discount	(77,427)	(36,178)
Share-based compensation	4,612	1,521
Deferred income taxes	1,145	26
Current income taxes	(8,439)	11,550
Unearned premiums, net	(18,329)	(36,272)
Losses and loss expenses, net	(1,371,840)	131,188
Ceded premiums payable	(1,425)	(2,328)
Investment income due and accrued	(3,926)	(1,250)
Premium receivables	5,601	8,630
Accrued interest payable	(82,992)	4,866
Amortization of insurance intangible assets	28,636	37,525
Net mark-to-market (gains) losses	452	(853)
Net realized investment gains	(4,862)	4,896
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities	299	3,942
Other-than-temporary impairment charges	299	3,942
(Gain) loss on extinguishment of debt	(3,115)	(2,741)
Variable interest entity activities	(574)	(3,701)
Increase (Decrease) in Derivative Assets and Liabilities	438	(101)
Other, net	34,299	(337)
Net cash used in operating activities	(1,191,562)	(4,788)
Cash flows from investing activities:
Proceeds from sales of bonds	296,078	305,541
Proceeds from matured bonds	103,995	227,741
Purchases of bonds	(77,469)	(439,473)
Proceeds from sales of other invested assets	31,327	121,353
Purchases of other invested assets	(11,758)	(139,561)
Change in short-term investments	236,262	83,550
Change in cash collateral receivable	(979)	9,615
Proceeds From Financial Guaranty Variable Interest Entity Assets	79,917	64,946
Other, net	(377)	(1,189)
Net cash provided by investing activities	656,996	232,523
Cash flows from financing activities:
Proceeds From Issuance of Tier II Notes	240,000	0
Paydowns of a secured borrowing	(8,797)	(10,355)
Payments for Repurchase of Warrants	8,092
Paydown of Financial Guaranty Variable Interest Entity Liabilities	(79,917)	(62,672)
Warrants Purchased During Period Dollars	0
Payments for investment agreement draws	0	(82,358)
Payments for extinguishment of long-term debt	(191,258)	(43,666)
Payments of Debt Issuance Costs	(9,221)	0
Payments Related to Tax Withholding for Share-based Compensation	(1,025)	(1,268)
Net cash used in financing activities	(50,218)	(200,319)
Effect of Exchange Rate on Cash and Cash Equivalents	(278)	463
Net cash flow	(585,062)	27,879
Cash, cash equivalents, and restricted cash at end of period	$ 38,485	$ 118,772

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Background and Business Description

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Background and Business Description

1. BACKGROUND AND BUSINESS DESCRIPTION

Ambac Financial Group, Inc. (“Ambac” or the “Company”), headquartered in New York City, is a financial services holding company incorporated in the state of Delaware on April 29, 1991.

Ambac provides financial guarantee insurance policies through its principal operating subsidiary, Ambac Assurance Corporation (“Ambac Assurance" or "AAC") and its wholly owned subsidiary, Ambac Assurance UK Limited (“Ambac UK”). Insurance policies issued by Ambac Assurance and Ambac UK generally guarantee payment when due of the principal and interest on the obligations guaranteed. Ambac also has another wholly-owned subsidiary, Everspan Financial Guarantee Corp. (“Everspan”), which has been in runoff since its acquisition in 1997. The deterioration of Ambac Assurance’s financial condition resulting from losses in its insured portfolio since 2007 has prevented Ambac Assurance and Ambac UK from being able to write new business. The inability to write new business has and will continue to negatively impact Ambac’s future operations and financial results. Ambac Assurance’s ability to pay dividends and, as a result, Ambac’s liquidity, have been significantly restricted by the deterioration of Ambac Assurance’s financial condition and by the terms of the Settlement Agreement, dated as of June 7, 2010 (the "Settlement Agreement"), by and among Ambac Assurance, Ambac Credit Products LLC (“ACP”), Ambac and certain counterparties to credit default swaps with ACP that were guaranteed by Ambac Assurance. Ambac Assurance is also restricted in its ability to pay dividends pursuant to regulatory restrictions, the Stipulation and Order (as described in Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017) and the terms of its Auction Market Preferred Shares. It is highly unlikely that Ambac Assurance will be able to make dividend payments to Ambac for the foreseeable future.

Ambac also provides other financial products through subsidiaries of Ambac Assurance. These products include interest rate swaps, funding conduits, and investment agreements (until the first quarter of 2017) that were provided principally to clients that were also provided financial guarantee policies. These financial products have been in active run-off since 2007.

Management reviews financial information, allocates resources and measures financial performance on a consolidated basis. As a result, the Company has a single reportable segment.

In February 2018, Ambac achieved one of its key strategic priorities, the exit from rehabilitation of the Segregated Account.  Having accomplished this milestone, Ambac will continue to pursue and prioritize its remaining key strategic priorities, namely:

• Active runoff of Ambac Assurance and its subsidiaries through transaction terminations, policy commutations, settlements and restructurings, with a focus on our watch list credits and known and potential future adversely classified credits, that we believe will improve our risk profile, and maximizing the risk-adjusted return on invested assets;

• Ongoing rationalization of Ambac's and its subsidiaries' capital and liability structures;

• Loss recovery through active litigation management and exercise of contractual and legal rights;

• Ongoing review of organizational effectiveness and efficiency of the operating platform; and

• Evaluation of opportunities in certain business sectors that meet acceptable criteria that will generate long-term stockholder value with attractive risk-adjusted returns.

With respect to our new business strategy, we have identified certain business sectors, adjacent to Ambac's core business, in which future opportunities will be evaluated. The evaluation will be conducted through a measured and disciplined approach to identify opportunities that are synergistic to Ambac, match Ambac's core competencies, are rapidly scalable or available through mergers and acquisitions and that may allow for the utilization of Ambac's net operating loss carry-forwards.  Although we are exploring new business opportunities, no assurance can be given that we will be able to execute or obtain the financial and other resources that may be required to finance the acquisition or development of any new businesses or assets. Furthermore, the execution of Ambac’s objective to increase the value of its investment in Ambac Assurance is subject to the rights of OCI under the Stipulation and Order, which requires OCI to approve certain actions taken by or in respect of Ambac Assurance, as well as the restrictions in the Settlement Agreement. Opportunities for remediating losses on poorly performing insured transactions also depend on market conditions, including the perception of Ambac Assurance’s creditworthiness, the structure of the underlying risk and associated policy as well as other counterparty specific factors. Decisions by OCI could impair Ambac’s ability to execute certain of its strategies. Ambac Assurance's ability to commute policies or purchase certain investments may also be limited by available liquidity. Due to these factors, as well as uncertainties relating to the ability of Ambac Assurance to deliver value to Ambac, the value of our securities remains speculative.

The Segregated Account

In March 2010, Ambac Assurance established a Segregated Account pursuant to Wisc. Stat. §611.24 (2) (the “Segregated Account”) to segregate certain segments of Ambac Assurance’s liabilities, and the Office of the Commissioner of Insurance for the State of Wisconsin (“OCI” (which term shall be understood to refer to such office as regulator of Ambac Assurance and to refer to the Commissioner of Insurance for the State of Wisconsin as rehabilitator of the Segregated Account (the “Rehabilitator”), as the context requires)) commenced rehabilitation proceedings in the Dane County, Wisconsin Circuit Court (the “Rehabilitation Court”) with respect to the Segregated Account (the “Segregated Account Rehabilitation Proceedings”) in order to permit OCI to facilitate an orderly run-off and/or settlement of the liabilities allocated to the Segregated Account pursuant to the provisions of the Wisconsin Insurers Rehabilitation and Liquidation Act. On October 8, 2010, OCI filed a plan of rehabilitation for the Segregated Account (the “Segregated Account Rehabilitation Plan”) in the Rehabilitation Court, which was confirmed by the Rehabilitation Court on January 24, 2011. On June 11, 2014, the Rehabilitation Court approved amendments to the Segregated Account Rehabilitation Plan and the Segregated Account Rehabilitation Plan, as amended, became effective on June 12, 2014. Policy obligations not allocated to the Segregated Account remained in the General Account of Ambac Assurance, and such policies in the General Account were not subject to and, therefore, were not directly impacted by the Segregated Account Rehabilitation Plan.

On February 12, 2018, Ambac successfully concluded the rehabilitation of the Segregated Account pursuant to an amendment of the Segregated Account Rehabilitation Plan (the "Second Amended Plan of Rehabilitation"). The conclusion of the rehabilitation followed the successful completion of Ambac's surplus note exchange offers and consent solicitation, which, together with the satisfaction of all remaining conditions precedent to the effectiveness of the Second Amended Plan of Rehabilitation, including the discharge of all unpaid policy claims of the Segregated Account, including accretion amounts thereon ("Deferred Amounts"), completed the restructuring transactions (the "Rehabilitation Exit Transactions") announced on July 19, 2017, as more fully described in Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

In exchange for an effective consideration package of 40% cash, 41% Secured Notes (as defined below) and 12.5% General Account Surplus Notes (as defined below), paid in respect of outstanding Deferred Amounts and General Account Surplus Notes, Ambac Assurance received the following benefits as a result of the completion of the Rehabilitation Exit Transactions:

• Satisfaction and discharge of all outstanding Deferred Amounts (including accretion) of the Segregated Account, totaling $3,856,992;

• Cancellation of $552,320 in principal amount outstanding, plus accrued and unpaid interest of $257,200 thereon, of AAC's 5.1% surplus notes due 2020 (the "General Account Surplus Notes"); and

• An effective discount of 6.5% on Deferred Amounts (applied first against accretion) and the outstanding amount of principal and accrued and unpaid interest on tendered General Account Surplus Notes

Ambac received $0.91 in principal amount of Secured Notes for each $1.00 of Deferred Amounts that it held, and provided a $0.09 discount in full satisfaction and discharge of its Deferred Amount claims. Ambac did not participate in the voluntary surplus note exchange offers.

A newly formed special purpose entity Ambac LSNI, LLC ("Ambac LSNI") issued new secured notes (the “Secured Notes”), secured by all assets of the special purpose entity, which include a note issued by Ambac Assurance to the special purpose entity (the "Ambac Note"), which is secured by a pledge of Ambac Assurance’s right, title and interest in up to the first $1,400,000 of proceeds (net of reinsurance) from certain litigations in which Ambac Assurance seeks redress for breaches of representations and warranties and/or fraud related to residential mortgage-backed securitizations (the “RMBS Litigations”). In addition, the Ambac Note is secured by cash and securities having a market value of $367,816 as of March 31, 2018. Ambac Assurance also pledged for the benefit of the holders of Secured Notes (other than Ambac Assurance) the proceeds of the Secured Notes held by Ambac Assurance from time to time, and issued a financial guaranty insurance policy to a trustee for the benefit of holders of Secured Notes irrevocably guarantying all principal and interest payments in respect of the Secured Notes as and when such payments become due and owing.

Prior to the Rehabilitation Exit Transactions, Ambac and Ambac Assurance owned securities that were insured by Ambac Assurance and allocated to the Segregated Account. As a result of the Rehabilitation Exit Transactions, Ambac Assurance and Ambac received $643,583 and $124,881, respectively, of par amount of secured notes issued by Ambac LSNI. Such secured notes are reported in Investments in the Consolidated Balance Sheets at their fair value.

Ambac Assurance also received $240,000 in cash proceeds from the issuance of notes secured by recoveries from RMBS Litigations in excess of $1.6 billion ("Tier 2 Notes").

Receipt of Requisite Consents for Bank Settlement Agreement Waiver and Amendment

Ambac received sufficient consents from holders of General Account Surplus Notes for a waiver and amendment (the "BSA Waiver and Amendment") of the Settlement Agreement. Among other provisions, the BSA Waiver and Amendment includes amendments to the Settlement Agreement that (i) eliminate the requirement for Ambac Assurance to have "unaffiliated qualified directors" on its Board of Directors; (ii) eliminate the prohibition on new business activities; (iii) modify the restrictions on the incurrence of indebtedness and other material obligations; (iv) modify the restrictions on liens securing permitted indebtedness; (v) modify restrictions applicable to junior surplus notes; and (vi) modify restrictions on mergers or similar transactions.

Regulatory Approval of the Rehabilitation Exit Transactions, including a partial interest payment on Surplus Notes

OCI provided all approvals necessary to consummate the Rehabilitation Exit Transactions, to give effect to the BSA Waiver and Amendment, and to make a $13,501 pro-rata interest payment, representing approximately six months of interest, on the outstanding principal and accrued and unpaid interest of General Account Surplus Notes that remained outstanding (of which $2,618 was received by Ambac for surplus notes that it owns that are considered extinguished for accounting purposes) after the closing of the Rehabilitation Exit Transactions on February 12, 2018. 

For more information about the Segregated Account rehabilitation and the Rehabilitation Exit Transactions and related matters, please refer to Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

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Basis of Presentation and Significant Accounting Policies (Notes)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]

2. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

The Company has disclosed its significant accounting policies in Note 2. Basis of Presentation and Significant Accounting Policies in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. The following significant accounting policies provide an update to those included in the Company’s Annual Report on Form 10-K.

Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial reporting and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and disclosures required by GAAP for annual periods. These consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2017. The accompanying consolidated financial statements have not been audited by an independent registered public accounting firm in accordance with the standards of the Public Company Accounting Oversight Board (U.S.), but in the opinion of management such financial statements include all adjustments necessary for the fair presentation of the Company’s consolidated financial position and results of operations. All intercompany balances and transactions have been eliminated. The results of operations for the three months ended March 31, 2018 may not be indicative of the results that may be expected for the year ending December 31, 2018. The December 31, 2017 consolidated balance sheet was derived from audited financial statements.

The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. As additional information becomes available or actual amounts become determinable, the recorded estimates are revised and reflected in operating results.

Foreign Currency:

Financial statement accounts expressed in foreign currencies are translated into U.S. dollars in accordance with the Foreign Currency Matters Topic of the ASC. The functional currencies of Ambac's subsidiaries are the local currencies of the country where the respective subsidiaries are based, which are also the primary operating environments in which the subsidiaries operate.

Foreign currency translation: Functional currency assets and liabilities of Ambac’s foreign subsidiaries are translated into U.S. dollars using exchange rates in effect at the balance sheet dates and the related translation adjustments, net of deferred taxes, are included as a component of Accumulated Other Comprehensive Income in Stockholders' Equity. Functional currency operating results of foreign subsidiaries are translated using average exchange rates.

Foreign currency transactions: The impact of non-functional currency transactions and the remeasurement of non-functional currency assets and liabilities into the respective subsidiaries' functional currency (collectively "foreign currency transactions gains/(losses)") are $5,018 and $6,465 for the three months endedMarch 31, 2018 and 2017. Foreign currency transactions gains/(losses) are primarily the result of remeasuring Ambac UK's assets and liabilities denominated in currencies other than its functional currency, primarily the U.S. dollar and the Euro. The significant components of foreign currency transaction gains/(losses), including the respective classifications in the Consolidated Statement of Total Comprehensive Income, are as follows:

• Remeasurement of loss reserves, classified in Loss and loss expenses, in the amount of $11,016 and $5,827 for the three months endedMarch 31, 2018 and 2017, respectively;

• Realized gain (losses) from the sale of investment securities and the unrealized gains (losses) on trading and short-term investment securities, classified in Net realized investment gains, in the amount of $(4,804) and $1,916 for the three months endedMarch 31, 2018 and 2017, respectively;

• Remeasurement of premium receivables, classified in Other income, in the amount of $(1,387) and $(560) for the three months endedMarch 31, 2018 and 2017, respectively; and

• Remeasurement of credit derivative liabilities, classified in Net change in fair value of credit derivative, in the amount of $(25) and $(706) for the three months endedMarch 31, 2018 and 2017, respectively.

Supplemental Disclosure of Cash Flow Information

	Three Months Ended March 31,
	2018	2017
Cash paid during the period for:
Income taxes	9,718	8,295
Interest on long-term debt and investment agreements	100,958	20,496
Non-cash financing activities:
Decrease in long-term debt as a result of an exchange for investment securities	—	55,426
Reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets to the Consolidated Statements of Cash Flows:
Cash and cash equivalents	38,485	118,772
Restricted cash	1,134	5,005
Total cash, cash equivalents, and restricted cash shown on the Consolidated Statements of Cash Flows	39,619	123,777

In addition to the non-cash financing activities disclosed in the above table, the Rehabilitation Exit Transactions involved the exchange of cash and non-cash consideration for the discharge of all Deferred Amounts and cancellation of certain General Account Surplus Notes. Refer to Note 1. Background and Business Description of this Form 10-Q and Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for further details of the transactions.

Reclassifications:

Reclassifications have been made to prior years' amounts to conform to the current year's presentation. Such reclassifications are primarily the result of certain new standards discussed in the Recently Adopted Accounting Standards section below.

Recently Adopted Accounting Standards:

Effective January 1, 2018, Ambac adopted the following accounting standards:

Stock Compensation--Scope of Modification Accounting

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718) - Scope of Modification Accounting. The ASU provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Entities will apply the modification accounting guidance if the value, vesting conditions or classification of the award changes. The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this ASU. The adoption of this ASU did not have an impact on Ambac's financial statements.

Net Periodic Pension and Postretirement Costs

In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715) - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The objective of the ASU is to increase transparency in the reporting of net pension cost and net postretirement cost (collectively "net benefit cost"). The ASU requires that the service cost component of net benefit cost be reported on the same line item as other compensation costs arising from services rendered by employees. It further requires that the other components of net benefit costs (i.e. interest costs, amortization of prior service cost, etc.) be presented separately from the service cost component and outside the subtotal of income from operations, if one is presented. Prior to adoption of this ASU, Ambac reported all postretirement costs in Operating expenses on the Consolidated Statements of Total Comprehensive Income (Loss). Adoption of this ASU resulted in a reclassification of other non-service related costs from Operating expenses to Other income (expense) of $144 for the three months ended March 31, 2017.

Restricted Cash

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash. Prior to the effective date of this ASU, GAAP did not include specific guidance on the cash flow classification and presentation of changes in restricted cash and restricted cash flow equivalents other than limited guidance for non-for-profit entities. This ASU is intended to resolve diversity in practice in the classification of changes in restricted cash and restricted cash flow equivalents on the statement of cash flows. The ASU requires that restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning and ending period amounts on the statement of cash flows, along with certain disclosures. Adoption of this ASU resulted in the inclusion of restricted cash activity related to consolidated VIEs on the Consolidated Statements of Cash Flows for the three months ended March 31, 2018 and March 31, 2017. Also refer to the Supplemental Disclosure of Cash Flow Information section above for the reconciliation of cash, cash equivalents, and restricted cash reported on the Consolidated Statement of Position that sum to the total of the same such amounts on the Consolidated Statements of Cash Flows.

Income Taxes

In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740) - Intra-Entity Transfers of Assets Other Than Inventory. Prior to the effective date of this ASU, GAAP prohibited the recognition of current and deferred income taxes for intercompany transfers of assets until the asset had been sold to an outside party. The ASU requires companies to recognize the income tax effects of intercompany sales and transfers of assets other than inventory, as income tax expense (or benefit) in the period in which the transfer occurs. The adoption of this ASU did not have an impact on Ambac's financial statements.

Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments. The ASU resolves diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. Transactions addressed in the ASU that are potentially relevant to Ambac include the following:

• Debt prepayment or debt extinguishment costs - Such payments will be classified as a financing cash outflow.

• Settlement of zero-coupon debt or other debt with coupon rates that are insignificant in relation to the effective interest rate of the borrowing - The portion of the cash payment attributable to accreted interest will be classified as an operating cash outflow and the portion attributable to the principal will be classified as a financing cash outflow.

• Distributions from equity-method investees - An entity will elect one of the two following approaches. Under the "cumulative earnings approach": i) distributions received up to the amount of cumulative earnings recognized will be treated as returns on investments and classified as cash inflows from operating activities and ii) distributions received in excess of earnings recognized will be treated as returns of investments and classified as cash inflows from investing activities. Under the "nature of the distribution" approach, distributions received will be classified based on the nature of the activity that generated the distribution (i.e. classified as a return on investment or return of investment), when such information is available to the investor.

• Beneficial interests in securitization transactions - Any beneficial interests obtained in financial assets transferred to an unconsolidated securitization entity will be disclosed as a non-cash investing activity. Subsequent cash receipts from the beneficial interests in previously transferred trade receivables will be classified as cash inflows from investing activities.

The adoption of this ASU did not have an impact on Ambac's financial statements.

Recognition and Measurement of Financial Assets and Liabilities

In January 2016, the FASB issued ASC 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU makes the following targeted changes for financial assets and liabilities: i) requires equity investments with readily determinable fair values to be measured at fair value with changes recognized in net income; ii) simplifies the impairment assessment of equity securities without readily determinable fair values using a qualitative approach; iii) eliminates disclosure of the method and significant assumptions used to fair value instruments measured at amortized cost on the balance sheet; iv) requires the use of the exit price notion when measuring the fair value of instruments for disclosure purposes; v) for financial liabilities where the fair value option has been elected, requires the portion of the fair value change related to instrument-specific credit risk, to be separately reported in other comprehensive income; vi) requires the separate presentation of financial assets and liabilities by measurement category and form of financial asset (liability) on the balance sheet or accompanying notes; and vii) clarifies that the evaluation of a valuation allowance on a deferred tax asset related to available-for-sale securities should be performed in combination with the entity's other deferred tax assets.

With respect to item (v) above, Ambac has elected the fair value option for all VIE financial liabilities. For these VIE liabilities this ASU has resulted in a cumulative-effect reclassification of $2,900, net of deferred tax of $590, between Retained earnings and Accumulated other comprehensive income, with no net change to Total stockholders' equity as of January 1, 2018. For the three months ended March 31, 2018 and going forward, the instrument-specific credit risk of fair value changes in VIE liabilities has been and will be reported in Accumulated other comprehensive income in accordance with this ASU, with all other fair value changes continuing to be reported through net income. There was no material impact on Ambac's financial statements for the other provisions of this ASU.

Revenue recognition

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) that amends the accounting guidance for recognizing revenue for contracts with customers to transfer goods and contracts for the transfer of non-financial assets unless those contracts are within the scope of other accounting standards. As this ASU does not apply to insurance contracts and most financial instruments management determined there was no impact on Ambac's financial statements.

Future Application of Accounting Standards:

Equity-linked instruments with down round features

In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260) and Derivatives and Hedging (Topic 815) - Accounting for Certain Financial Instruments with Down Round Features. Equity-linked instruments, such as warrants and convertible instruments may contain down round features that result in the strike price being reduced on the basis of the pricing of future equity offerings. Under the ASU, a down round feature will no longer require a freestanding equity-linked instrument (or embedded conversion option) to be classified as a liability that is remeasured at fair value through the income statement (i.e. marked-to-market). However, other features of the equity-linked instrument (or embedded conversion option) must still be evaluated to determine whether liability or equity classification is appropriate. Equity classified instruments are not marked-to-market. For earnings per share ("EPS") reporting, the ASU requires companies to recognize the effect of the down round feature only when it is triggered by treating it as a dividend and as a reduction of income available to common stockholders in basic EPS. The amendments in this ASU are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in any interim period. Ambac will adopt this ASU on January 1, 2019. The adoption of this ASU is not expected to have a consequential impact on Ambac's financial statements.

Premium Amortization on Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20) - Premium Amortization on Purchased Callable Debt Securities. The ASU shortens the amortization period for the premium on callable debt securities to the earliest call date. Under current GAAP, a reporting entity generally amortizes the premium as yield adjustment over the contractual life (i.e. maturity) of the debt security and if that debt security is called, the entity would record a loss equal to the unamortized premium. The ASU does not change the accounting for callable debt securities held at a discount, which will continue to be amortized to maturity. ASU 2017-08 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. The ASU must be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Ambac will adopt this ASU on January 1, 2019 and we are evaluating its impact on Ambac's financial statements.

Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments. This ASU significantly affects how reporting entities will measure credit losses for financial assets that are not accounted for at fair value through net income, which include loans, debt securities, trade receivables, net investments in leases, and certain off-balance sheet credit exposures. For financial assets measured at amortized cost, the ASU replaces the "incurred loss" model, which generally delayed recognition of the full amount of credit losses until the loss was probable of occurring, with an "expected loss" model, which reflects an entity's current estimate of all expected credit losses. Expected credit losses for amortized cost assets will be recorded as a valuation allowance, with subsequent increases or decreases in the allowance reflected in the income statement each period. For available-for-sale debt securities, credit losses under the ASU will be measured similarly to current GAAP. However, under the ASU, credit losses for available-for-sale securities will be recorded as a valuation allowance (similar to the amortized cost assets approach described above), rather than as a direct write-down of the security as is required under current GAAP. As a result, improvements to estimated credit losses for available-for-sale debt securities will be recognized immediately in the income statement rather than as interest income over time. The ASU is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted as of the fiscal year beginning after December 15, 2018. Ambac has not determined whether it will early adopt this ASU and we are currently evaluating its impact on Ambac's financial statements. The significant implementation matters to be addressed include identifying the inventory of financial assets that will be affected by this standard, identifying new data requirements and data sources for implementing the expected loss model for those instruments not already using this model and identifying and documenting accounting process changes, including related controls.

Leases

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main difference between current U.S. GAAP and this ASU is the recognition of lease assets and lease liabilities for those leases classified as operating leases. For operating leases, a lessee is required to: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the balance sheet, 2) recognize a single lease cost, calculated so that the cost is allocated over the lease term generally on a straight-line basis and 3) classify all cash payment within operating activities in the statement of cash flows. The ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The transition guidance requires lessees to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach which include a number of optional practical expedients. We will adopt ASU 2015-02 on January 1, 2019. We are evaluating the impact of this ASU, including the transitional practical expedients, on Ambac's financial statements. We believe Ambac's office leases will be the most significantly impacted by this ASU. The significant implementation matters to be addressed include identifying the remaining inventory of leases (i.e. equipment and other) that will be affected by this standard and identifying and documenting accounting process changes, including related controls.

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Special Purpose Entities, Including Variable Interest Entities

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Special Purpose Entities, Including Variable Interest Entities

3. SPECIAL PURPOSE ENTITIES, INCLUDING VARIABLE INTEREST ENTITIES

Ambac, with its subsidiaries, has engaged in transactions with special purpose entities, including VIEs, in various capacities.

• Ambac most commonly provides financial guarantees, including credit derivative contracts, for various debt obligations issued by special purpose entities, including VIEs ("FG VIEs").

• Ambac sponsors special purpose entities that issued notes to investors for various purposes.

• Ambac monetized its ownership of the junior surplus note issued to it by the Segregated Account by depositing the junior surplus note into a newly formed VIE trust in exchange for cash and an owner trust certificate, which represents Ambac's right to residual cash flows from the junior surplus note.

• Ambac is an investor in collateralized loan obligations, mortgage-backed and other asset-backed securities issued by VIEs and its ownership interest is generally insignificant to the VIE and/or Ambac does not have rights that direct the activities that are most significant to such VIE.

FG VIEs:

Ambac’s subsidiaries provide financial guarantees in respect of assets held or debt obligations of special purpose entities, including VIEs. Ambac’s primary variable interest exists through this financial guarantee insurance or credit derivative contract. The transaction structures provide certain financial protection to Ambac. Generally, upon deterioration in the performance of a transaction or upon an event of default as specified in the transaction legal documents, Ambac will obtain certain loss remediation rights. These rights may enable Ambac to direct the activities of the entity that most significantly impact the entity’s economic performance.

We determined that Ambac’s subsidiaries generally have the obligation to absorb a FG VIE's expected losses given that they have issued financial guarantees supporting certain liabilities (and in some cases certain assets). As further described below, we consolidated certain FG VIEs because: (i) we determined, for certain transactions that experienced the aforementioned performance deterioration, that Ambac’s subsidiaries had the power, through voting rights or similar rights, to direct the activities that most significantly impact the VIE’s economic performance because certain triggers had been breached in these transactions resulting in Ambac's subsidiaries' ability to exercise certain loss remediation activities or (ii) due to the passive nature of the VIEs’ activities, Ambac’s subsidiaries’ contingent loss remediation rights upon a breach of certain triggers in the future is considered to be the power to direct the activities that most significantly impact the VIEs’ economic performance. With respect to existing VIEs involving Ambac financial guarantees, Ambac is generally required to consolidate a VIE in the period that applicable triggers result in Ambac having control over the VIE’s most significant economic activities. FG VIEs which are consolidated include recourse liabilities and, in some cases, may include non-recourse liabilities. FG VIEs' liabilities that are insured by the Company are with recourse, because the Company guarantees the payment of principal and interest to the extent there is a shortfall in the FG VIEs' assets. FG VIEs' liabilities that are not insured by the Company are without recourse, because the payment of principal and interest of these liabilities is wholly dependent on the performance of the FG VIEs' assets. The Company’s exposure to consolidated FG VIEs is limited to the financial guarantees issued for recourse liabilities and any additional variable interests held by Ambac.

In connection with the exit from rehabilitation of the Segregated Account, as further described in Note 1. Background and Business Description and in Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, Ambac evaluated the consolidation of certain VIEs. Under the Stipulation and Order, the OCI retained the authority requiring Ambac Assurance to obtain their approval with respect to the exercise of certain control rights in connection with certain policies that had previously been allocated to the Segregated Account. Accordingly, Ambac was not required to consolidate any additional VIEs as a result of the Segregated Account's exit from rehabilitation. A VIE is deconsolidated in the period that Ambac no longer has such control, which could occur in connection with the execution of remediation activities on the transaction or amortization of insured exposure, either of which may reduce the degree of Ambac’s control over a VIE. Assets and liabilities of FG VIEs that are consolidated are reported within Variable interest entity assets or Variable interest entity liabilities on the Consolidated Balance Sheets. The net results from such FG VIEs are reported within Income (loss) on variable interest entities in the Consolidated Statements of Total Comprehensive Income (Loss).

Upon initial consolidation of a FG VIE, we recognize a gain or loss in earnings for the difference between: (i) the fair value of the consideration paid, the fair value of any non-controlling interests and the reported amount of any previously held interests and (ii) the net amount, as measured on a fair value basis, of the assets and liabilities consolidated. Upon deconsolidation of a FG VIE, we recognize a gain or loss for the difference between: (i) the fair value of any consideration received, the fair value of any retained non-controlling investment in the VIE and the carrying amount of any non-controlling interest in the VIE and (ii) the carrying amount of the VIE’s assets and liabilities. Gains or losses from consolidation and deconsolidation that are reported in earnings are reported within Income (loss) on variable interest entities on the Consolidated Statements of Total Comprehensive Income (Loss).

The impact of consolidating such FG VIEs on Ambac’s balance sheet is the elimination of transactions between the consolidated FG VIEs and Ambac’s operating subsidiaries and the inclusion of the FG VIE’s third party assets and liabilities. For a financial guarantee insurance policy issued to a consolidated VIE, Ambac does not reflect the financial guarantee insurance policy in accordance with the related insurance accounting rules under the Financial Services – Insurance Topic of the ASC. Consequently, upon consolidation, Ambac eliminates the insurance assets and liabilities associated with the policy from the Consolidated Balance Sheets. Such insurance assets and liabilities may include premium receivables, reinsurance recoverable, deferred ceded premium, subrogation recoverable, unearned premiums, loss and loss expense reserves, ceded premiums payable and insurance intangible assets. For investment securities owned by Ambac that are debt instruments issued by the VIE, the investment securities balance is eliminated upon consolidation.

As of March 31, 2018 consolidated FG VIE assets and liabilities relating to 11 consolidated entities were $14,565,123 and $14,428,632, respectively. As of December 31, 2017, consolidated FG VIE assets and liabilities relating to 11 consolidated entities were $14,500,507 and $14,366,434, respectively. As of both March 31, 2018 and December 31, 2017, eight and three consolidated FG VIEs related to transactions insured by Ambac UK and Ambac Assurance, respectively. As of March 31, 2018, FG VIE assets and liabilities of $14,247,950 and $14,111,885 and as of December 31, 2017, FG VIE assets and liabilities of $14,160,152 and $14,026,704 related to transactions guaranteed by Ambac UK. The remaining balance of consolidated FG VIE assets and liabilities are related to transactions guaranteed by Ambac Assurance. Ambac is not primarily liable for, and generally does not guarantee all of the debt obligations issued by the VIEs. Ambac would only be required to make payments on the VIE debt obligations in the event that the issuer of such debt obligations defaults on any principal or interest due and such obligation is guaranteed by Ambac. Additionally, Ambac’s general creditors, other than those specific policy holders which own the VIE debt obligations, do not have rights with regard to the assets of the VIEs. Ambac evaluates the net income effects and earnings per share effects to determine attributions between Ambac and non-controlling interests as a result of consolidating a VIE. Ambac has determined that the net income and earnings per share effect of most consolidated FG VIEs are attributable to Ambac’s interests through financial guarantee premium and loss payments with the VIE.

Below is a schedule detailing the change in fair value of the various financial instruments within the consolidated FG VIEs, along with gains (losses) from consolidating and deconsolidating FG VIEs that together comprise Income (loss) on variable interest entities for the affected periods:

	Three Months Ended March 31,
	2018			2017
Income (loss) on changes related to:
Net change in fair value of VIE assets and liabilities	$	1,918		$	3,701
Less: Credit risk changes of fair value liabilities	(1,344		)	—
Consolidation / Deconsolidation	—			—
Income (loss) on Variable Interest Entities	$	574		$	3,701

Effective January 1, 2018, Ambac adopted ASU 2016-01 related to the recognition and measurement of financial liabilities where the fair value option has been elected. As further described in Note 2. Basis of Presentation and Significant Accounting Policies, this guidance requires the portion of the total change in fair value caused by changes in the instrument-specific credit risk to be presented separately in OCI; previously these amounts were recognized in net income. Ambac has elected the fair value option for all consolidated FG VIE liabilities and as such, $1,344 of changes in instrument-specific credit risk for such liabilities was recorded in OCI for the three months ended March 31, 2018.

Ambac consolidated zero and deconsolidated zero VIEs for the three months ended March 31, 2018 and 2017.

The table below provides the fair value of fixed income securities, by asset-type, held by consolidated VIEs as of March 31, 2018 and December 31, 2017:

	March 31, 2018		December 31, 2017
Investments:
Corporate obligations	$	2,955,763	$	2,914,145
Total variable interest entity assets: fixed income securities	$	2,955,763	$	2,914,145

The following table provides supplemental information about the loans held as assets and long-term debt associated with the VIEs for which the fair value option has been elected as of March 31, 2018 and December 31, 2017:

	Estimated Fair Value		Unpaid Principal Balance
March 31, 2018:
Loans	$	11,558,331	$	8,413,664
Long-term debt	12,270,124		9,679,441
December 31, 2017:
Loans	$	11,529,384	$	8,168,651
Long-term debt	12,160,544		9,387,884

Ambac Sponsored VIEs:

A subsidiary of Ambac transferred financial assets to a special purpose entity. The business purpose of this entity was to provide certain financial guarantee clients with funding for their debt obligations. This special purpose entity was established as a separate legal entity, demonstrably distinct from Ambac and that Ambac, its affiliates or its agents could not unilaterally dissolve. The permitted activities of this entity are contractually limited to purchasing assets from Ambac, issuing medium-term notes (“MTNs”) to fund such purchases, executing derivative hedges and obtaining financial guarantee policies with respect to indebtedness incurred. Ambac does not consolidate this entity because Ambac Assurance’s policies issued to this entity were previously allocated to the Segregated Account and, as discussed above, the exercise of related control rights in such policies remain subject to OCI approval under the Stipulation and Order. Ambac elected to account for its equity interest in this entity at fair value under the fair value option in accordance with the Financial Instruments Topic of the ASC. We believe that the fair value of the investments in this entity provides for greater transparency for recording profit or loss as compared to the equity method under the Investments – Equity Method and Joint Ventures Topic of the ASC. Refer to Note 7. Fair Value Measurements for further information on the valuation technique and inputs used to measure the fair value of Ambac’s equity interest in this entity. At March 31, 2018 and December 31, 2017 the fair value of this entity was $5,621 and $5,979, respectively, and is reported within Other assets on the Consolidated Balance Sheets.

• Total principal amount of debt outstanding was $436,080 and $420,600 at March 31, 2018 and December 31, 2017, respectively. In each case, Ambac sold assets to this entity. The assets are composed of utility obligations with a weighted average rating of BBB+ at March 31, 2018 and weighted average life of 2.9 years. The purchase by this entity of financial assets was financed through the issuance of MTNs, which are cross-collateralized by the purchased assets. The MTNs have the same expected weighted average life as the purchased assets. Derivative contracts (interest rate swaps) are used within the entity for economic hedging purposes only. Derivative positions were established at the time MTNs were issued to purchase financial assets. As of March 31, 2018 Ambac Assurance had financial guarantee insurance policies issued for all assets, MTNs and derivative contracts owned and outstanding by the entity.

• Insurance premiums paid to Ambac Assurance by this entity are earned in a manner consistent with other insurance policies, over the risk period. Additionally, any losses incurred on such insurance policies are included in Ambac’s Consolidated Statements of Total Comprehensive Income (Loss). Under the terms of an Administrative Agency Agreement, Ambac provides certain administrative duties, primarily collecting amounts due on the obligations and making interest payments on the MTNs.

In July 2015, Ambac Assurance entered into a secured borrowing transaction whereby it sold 17 Ambac insured residential mortgage-backed securities (the "Securities") and all rights associated therewith as of May 31, 2015, to a Delaware statutory trust (the "Trust") in exchange for an equity certificate in the Trust, all financial guarantee claim payments associated with the Securities and cash of $146,000 (prior to expenses associated with the transaction). Although the Securities were legally sold to the Trust, the Securities remain in Invested assets on the Consolidated Balance Sheets. The Securities had par and fair value of $285,437 and $256,553 as of March 31, 2018, respectively. Refer to Note 8. Investments for further discussion of the restrictions on the invested assets. At the same time, a second Delaware statutory trust (the "Issuer"), issued $146,000 of debt securities and used the proceeds, together with an equity certificate of the Issuer, to purchase from the Trust a certificate secured by and entitling the Issuer to all principal and interest payments (other than financial guarantee claim payments) on the Securities. Interest on the debt securities is payable monthly at an annual rate of one month LIBOR + 2.8%. Both the Trust and the Issuer are consolidated VIEs because Ambac Assurance was involved in their design and holds a significant amount of the beneficial interests issued by the VIEs or guaranteed the assets held by the VIEs. VIE debt outstanding to third parties under this secured borrowing transaction had a carrying value of $65,196 and $73,993 as of March 31, 2018 and December 31, 2017, respectively, and is reported in Long-Term Debt on the Consolidated Balance Sheets.

Variable Interests in Non-Consolidated VIEs

On August 28, 2014, Ambac monetized its ownership of the junior surplus note issued to it by the Segregated Account by depositing the junior surplus note into a newly formed VIE trust in exchange for cash and an owner trust certificate, which represents Ambac's right to residual cash flows from the junior surplus note. Ambac does not consolidate the VIE. Ambac reports this interest in the VIE as an equity investment within Other investments on the Consolidated Balance Sheets with associated results from operations included within Net investment income: Other investments on the Consolidated Statements of Total Comprehensive Income (Loss). The equity investment had a carrying value of $36,209 and $34,941 as of March 31, 2018 and December 31, 2017, respectively.

On February 12, 2018, Ambac formed a special purpose entity, Ambac LSNI, to issue Secured Notes in connection with the Rehabilitation Exit Transactions. Prior to the Rehabilitation Exit Transactions, Ambac and Ambac Assurance owned securities that were insured by Ambac Assurance and allocated to the Segregated Account. As a result of the Rehabilitation Exit Transactions, Ambac Assurance and Ambac received $643,583 and $124,881, respectively, of par amount of secured notes issued by Ambac LSNI. Ambac does not consolidate the VIE and reports its holdings of Secured Notes as Fixed Income Securities in the Consolidated Balance Sheets.

The following table displays the carrying amount of the assets, liabilities and maximum exposure to loss of Ambac’s variable interests in non-consolidated VIEs resulting from financial guarantee and derivative contracts by major underlying asset classes, as of March 31, 2018 and December 31, 2017:

	Carrying Value of Assets and Liabilities
	Maximum Exposure To Loss (1)		Insurance Assets (2)		Insurance Liabilities (3)		Net Derivative Assets (Liabilities) (4)
March 31, 2018:
Global structured finance:
Collateralized debt obligations	$	31,644	$	157	$	2	$	(13	)
Mortgage-backed—residential	8,033,584		1,742,097		670,052		—
Other consumer asset-backed	2,209,778		22,416		331,147		—
Other commercial asset-backed	934,919		27,527		30,837		—
Other	2,482,479		57,718		302,232		7,751
Total global structured finance	13,692,404		1,849,915		1,334,270		7,738
Global public finance	25,695,196		345,678		379,521		(1,005		)
Total	$	39,387,600	$	2,195,593	$	1,713,791	$	6,733
December 31, 2017:
Global structured finance:
Collateralized debt obligations	$	35,555	$	169	$	1	$	(15	)
Mortgage-backed—residential	12,766,685		619,848		3,218,356		—
Other consumer asset-backed	2,266,610		23,405		328,732		—
Other commercial asset-backed	987,797		30,413		35,976		—
Other	2,513,304		60,086		306,457		10,311
Total global structured finance	18,569,951		733,921		3,889,522		10,296
Global public finance	25,629,816		335,347		371,056		(551		)
Total	$	44,199,767	$	1,069,268	$	4,260,578	$	9,745

(1) Maximum exposure to loss represents the maximum future payments of principal and interest on insured obligations and derivative contracts plus Deferred Amounts and accrued and unpaid interest thereon. On February 12, 2018, all Deferred Amounts and Interest Accrued on Deferred Amounts were settled in connection with the Rehabilitation Exit Transactions. Ambac’s maximum exposure to loss does not include the benefit of any financial instruments (such as reinsurance or hedge contracts) that Ambac may utilize to mitigate the risks associated with these variable interests.

(2) Insurance assets represent the amount recorded in “Premium receivables” and “Subrogation recoverable” for financial guarantee contracts on Ambac’s Consolidated Balance Sheets.

(3) Insurance liabilities represent the amount recorded in “Loss and loss expense reserves” and “Unearned premiums” for financial guarantee contracts on Ambac’s Consolidated Balance Sheets.

(4) Net derivative assets (liabilities) represent the fair value recognized on credit derivative contracts and interest rate swaps on Ambac’s Consolidated Balance Sheets.

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Comprehensive Income

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Comprehensive Income

4. COMPREHENSIVE INCOME

The following tables detail the changes in the balances of each component of accumulated other comprehensive income for the affected periods:

	Unrealized Gains (Losses) on Available for Sale Securities (1)			Amortization of Postretirement Benefit (1)			Gain (Loss) on Foreign Currency Translation (1)			Credit Risk Changes of Fair Value Option Liabilities (1) (2)			Total
Three Months Ended March 31, 2018:
Beginning Balance	$	30,755		$	10,640		$	(93,634	)	$	—		$	(52,239	)
Adjustment to opening balance, net of taxes (3)	—			—			—			(2,900		)	(2,900		)
Adjusted balance, beginning of period	30,755			10,640			(93,634		)	(2,900		)	(55,139		)
Other comprehensive income (loss) before reclassifications	125,159			(556		)	32,056			—			156,659
Amounts reclassified from accumulated other comprehensive income (loss)	(2,855		)	(303		)	—			1,114			(2,044		)
Net current period other comprehensive income (loss)	122,304			(859		)	32,056			1,114			154,615
Balance at March 31, 2018	$	153,059		$	9,781		$	(61,578	)	$	(1,786	)	$	99,476
Three Months Ended March 31, 2017:
Beginning Balance	$	118,863		$	9,367		$	(167,220	)	$	—		$	(38,990	)
Other comprehensive income (loss) before reclassifications	12,500			2,625			12,593			—			27,718
Amounts reclassified from accumulated other comprehensive income (loss)	8,835			(338		)	—			—			8,497
Net current period other comprehensive income (loss)	21,335			2,287			12,593			—			36,215
Balance at March 31, 2017	$	140,198		$	11,654		$	(154,627	)	$	—		$	(2,775	)

(1) All amounts are net of tax and noncontrolling interest. Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income.

(2) Represents the changes in fair value attributable to instrument-specific credit risk of liabilities for which the fair value option is elected.

(3) Beginning in 2018, Credit risk changes of fair value option liabilities are reflected as a component of Accumulated Other Comprehensive Income pursuant to the adoption of ASU 2016-01. See Note 2 to the Consolidated Financial Statements included in this Form 10-Q for further information regarding this change.

The following table details the significant amounts reclassified from each component of accumulated other comprehensive income, shown in the above rollforward tables, for the affected periods:

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income (1)						Affected Line Item in the Consolidated Statement of Total Comprehensive Income (Loss)
	Three Months Ended March 31,
	2018			2017
Unrealized Gains (Losses) on Available-for-Sale Securities
	$	(4,563	)	$	8,835		Net realized investment gains (losses) and other-than-temporary impairment losses
	1,708			—			Provision for income taxes
	$	(2,855	)	$	8,835		Net of tax and noncontrolling interest
Amortization of Postretirement Benefit
Prior service cost	$	(241	)	$	(241	)	Other income (2)
Actuarial (losses)	(62		)	(97		)	Other income (2)
	(303		)	(338		)	Total before tax
	—			—			Provision for income taxes
	(303		)	(338		)	Net of tax and noncontrolling interest
Credit risk changes of fair value option liabilities
	$	1,344		$	—		Credit Risk Changes of Fair Value Option Liabilities
	(230		)	—			Provision for income taxes
	$	1,114		$	—		Net of tax and noncontrolling interest
Total reclassifications for the period	$	(2,044	)	$	8,497		Net of tax and noncontrolling interest

(1) Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income with corresponding increases to the affected line items in the Consolidated Statement of Total Comprehensive Income.

(2) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost.

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Net Income Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Net Income Per Share

5. NET INCOME PER SHARE

On May 1, 2013, pursuant to the Second Modified Fifth Amended Plan of Reorganization of Ambac (the "Reorganization Plan"), 45,000,000 shares of new common stock at par value of $0.01 per share and 5,047,138 of warrants were issued. Warrants entitled such holders to acquire up to 5,047,138 shares of new common stock at an exercise price of $16.67 per share at any time on or prior to April 30, 2023. For the three months ended March 31, 2018 and 2017, 194 and 0 warrants were exercised, respectively, resulting in an issuance of 194 and 0 shares of common stock, respectively.

On June 30, 2015, the Board of Directors of Ambac authorized the establishment of a warrant repurchase program that permits the repurchase of up to $10,000 of warrants. On November 3, 2016, the Board of Directors of Ambac authorized a $10,000 increase to the warrant repurchase program. For the three months ended March 31, 2018, Ambac repurchased 0 warrants at a cost of $0. As of March 31, 2018, Ambac has repurchased 985,331 warrants totaling $8,092, (average cost of $8.21 per warrant) leaving 4,053,476 warrants outstanding. The remaining aggregate authorization at March 31, 2018 is $11,939.

Basic net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding and vested restricted stock units. Diluted net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares used for basic earnings per share plus all potential dilutive common shares outstanding during the period. All potential dilutive common shares outstanding consider common stock deliverable pursuant to warrants issued under the Reorganization Plan, vested and unvested options, unvested restricted stock units and performance stock units granted under employee and director compensation plans.

The following table provides a reconciliation of the common shares used for basic net income per share to the diluted shares used for diluted net income per share:

	Three Months Ended March 31,
	2018	2017
Basic weighted average shares outstanding	45,471,083	45,292,253
Effect of potential dilutive shares (1):
Warrants	—	—
Restricted stock units	45,713	—
Performance stock units	136,675	—
Diluted weighted average shares outstanding	45,653,471	45,292,253
Anti-dilutive shares excluded from the above reconciliation:
Stock options	126,667	126,667
Warrants	4,053,476	4,053,670
Restricted stock units	—	94,204
Performance stock units (2)	—	342,456

(1) For the three months ended March 31, 2017, Ambac had a net loss and accordingly excluded all potentially dilutive securities from the determination of diluted loss per share as their impact was anti-dilutive.

(2) Performance stock units are reflected herein at their target issuance amounts. Vesting of these units is contingent upon meeting certain performance metrics. Although a portion of these performance metrics have been achieved as of the respective period end, it is possible that awards may no longer meet the metric at the end of the performance period.

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Financial Guarantee Insurance Contracts

3 Months Ended

Mar. 31, 2018

Insurance [Abstract]

Financial Guarantee Insurance Contracts

6. FINANCIAL GUARANTEE INSURANCE CONTRACTS

Amounts presented in this Note relate only to Ambac’s non-derivative insurance business for insurance policies issued to beneficiaries, including VIEs, for which we do not consolidate the VIE.

Net Premiums Earned:

Gross premiums are received either upfront or in installments. For premiums received upfront, an unearned premium revenue (“UPR”) liability is established, which is initially recorded as the cash amount received. For installment premium transactions, a premium receivable asset and offsetting UPR liability is initially established in an amount equal to: (i) the present value of future contractual premiums due (the “contractual” method) or (ii) if the assets underlying the insured obligation are homogenous pools which are contractually prepayable, the present value of premiums to be collected over the expected life of the transaction (the “expected” method). An appropriate risk-free rate corresponding to the weighted average life of each policy and currency is used to discount the future premiums contractually due or expected to be collected. For example, U.S. dollar exposures are discounted using U.S. Treasury rates while exposures denominated in a foreign currency are discounted using the appropriate risk-free rate for the respective currency. The weighted average risk-free rate at March 31, 2018 and December 31, 2017, was 2.7% and 2.5%, respectively, and the weighted average period of future premiums used to estimate the premium receivable at March 31, 2018 and December 31, 2017, was 8.9 years and 9.8 years, respectively.

Insured obligations consisting of homogeneous pools for which Ambac uses expected future premiums to estimate the premium receivable and UPR include residential mortgage-backed securities. As prepayment assumptions change for homogenous pool transactions, or if there is an actual prepayment for a “contractual” method installment transaction, the related premium receivable and UPR are adjusted in equal and offsetting amounts with no immediate effect on earnings using new premium cash flows and the then current risk-free rate.

In evaluating the credit quality of the premium receivables, management evaluates the obligor's ability to pay. For structured finance transactions, this evaluation will include a review of the priority for the payment of financial guarantee premiums to Ambac, as required by bond indentures, in the transaction's waterfall structure. The financial guarantee premium is generally senior in the waterfall. Uncollectable premiums are determined on a policy basis and utilize a combination of historical premium collection data in addition to cash flow analysis to determine if an impairment in the related policy's premium receivables exist. At March 31, 2018 and December 31, 2017, $8,738 and $9,331 respectively, of premium receivables were deemed uncollectable. As of March 31, 2018 and December 31, 2017, approximately 21% and 22% of the premium receivables, net of uncollectable receivables, related to transactions with non-investment grade internal ratings, mainly of structured finance transactions, which comprised 14% and 16% of the total premium receivables at March 31, 2018 and December 31, 2017, respectively. Past due premiums on policies insuring non-investment grade obligations amounted to less than $500 at March 31, 2018.

Below is the gross premium receivable roll-forward for the affected periods:

	Three Months Ended March 31,
	2018			2017
Beginning premium receivable	$	586,312		$	661,337
Premium receipts	(15,381		)	(17,978		)
Adjustments for changes in expected and contractual cash flows	(1,289		)	1,352
Accretion of premium receivable discount	3,846			4,244
Changes to uncollectable premiums	604			(12		)
Other adjustments (including foreign exchange)	6,615			3,734
Ending premium receivable (1)	$	580,707		$	652,677

(1) Gross premium receivable includes premiums to be received in foreign denominated currencies most notably in British Pounds and Euros. At March 31, 2018 and 2017, premium receivables include British Pounds of $163,926 (£116,815) and $185,204 (£147,726), respectively, and Euros of $36,679 (€29,767) and $34,908 (€32,671), respectively.

Similar to gross premiums, premiums ceded to reinsurers are paid either upfront or in installments. Premiums ceded to reinsurers reduce the amount of premiums earned by Ambac from its financial guarantee insurance policies.

When a bond issue insured by Ambac Assurance has been retired early, typically due to an issuer call, any remaining UPR is recognized at that time to the extent the financial guarantee contract is legally extinguished, causing accelerated premium revenue. For installment premium paying transactions, we offset the recognition of any remaining UPR by the reduction of the related premium receivable to zero (as it will not be collected as a result of the retirement), which may cause negative accelerated premium revenue. Ambac’s accelerated premium revenue for retired obligations for the three months ended March 31, 2018 and 2017 was $9,392 and $16,280, respectively. Certain obligations insured by Ambac have been legally defeased whereby government securities are purchased by the issuer with the proceeds of a new bond issuance, or less frequently with other funds of the issuer, and held in escrow. The principal and interest received from the escrowed securities are then used to retire the Ambac-insured obligations at a future date either to their maturity date (a refunding) or a specified call date (a pre-refunding). Ambac has evaluated the provisions in policies issued on these obligations and determined those insurance policies have not been legally extinguished. For policies with refunding securities, premium revenue recognition is not impacted as the escrowed maturity date is the same as the previous legal maturity date. For policies with pre-refunding securities, the maturity date of the pre-refunded security has been shortened from its previous legal maturity. Although premium revenue recognition has not been accelerated in the period of the pre-refunding, it results in an increase in the rate at which the policy's remaining UPR is to be recognized.

The effect of reinsurance on premiums written and earned for the respective periods was as follows:

	Three Months Ended March 31,
	2018					2017
	Written			Earned		Written			Earned
Direct	$	4,261		$	32,609	$	5,584		$	52,065
Assumed	—			19		—			21
Ceded	(819		)	1,745		(1,815		)	4,473
Net premiums	$	5,080		$	30,883	$	7,399		$	47,613

The following table summarizes net premiums earned by location of risk for the respective periods:

	Three Months Ended March 31,
	2018		2017
United States	$	24,718	$	40,621
United Kingdom	4,856		5,263
Other international	1,309		1,729
Total	$	30,883	$	47,613

The table below summarizes the future gross undiscounted premiums to be collected and future premiums earned, net of reinsurance at March 31, 2018:

	Future Premiums to be Collected (1)		Future Premiums to be Earned Net of Reinsurance (1)
Three months ended:
June 30, 2018	$	14,957	$	17,037
September 30, 2018	14,771		16,388
December 31, 2018	12,947		15,946
Twelve months ended:
December 31, 2019	55,142		60,697
December 31, 2020	52,344		56,759
December 31, 2021	45,913		51,792
December 31, 2022	43,923		48,292
Five years ended:
December 31, 2027	195,614		196,972
December 31, 2032	153,584		132,598
December 31, 2037	85,689		73,307
December 31, 2042	31,028		25,070
December 31, 2047	14,425		12,798
December 31, 2052	3,620		4,656
December 31, 2057	92		297
Total	$	724,049	$	712,609

(1) Future premiums to be collected are undiscounted and are used to derive the discounted premium receivable asset recorded on Ambac's balance sheet. Future premiums to be earned, net of reinsurance relate to the unearned premiums liability and deferred ceded premium asset recorded on Ambac’s balance sheet. The use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral is required in the calculation of the premium receivable, as further described in Note 2. Basis of Presentation and Significant Accounting Policies in the Notes to Consolidated Financial Statements included in Ambac's Annual Report on Form 10-K for the year ended December 31, 2017. This results in a different premium receivable balance than if expected lives were considered. If installment paying policies are retired or prepay early, premiums reflected in the premium receivable asset and amounts reported in the above table for such policies may not be collected. Future premiums to be earned also considers the use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral, which may result in different unearned premium than if expected lives were considered. If those bonds types are retired early, premium earnings may be negative in the period of call or refinancing.

Loss and Loss Expense Reserves:

The loss and loss expense reserve (“loss reserve”) policy for financial guarantee insurance relates only to Ambac’s non-derivative insurance business for insurance policies issued to beneficiaries, including VIEs, for which we do not consolidate the VIE. Losses and loss expenses are based upon estimates of the ultimate aggregate losses inherent in the non-derivative financial guarantee portfolio as of the reporting date. A loss reserve is recorded on the balance sheet on a policy-by-policy basis. Loss reserve components of an insurance policy include unpaid claims and the present value ("PV") of expected net cash flows required to be paid under an insurance contract, further described below:

• Unpaid claims represent the sum of (i) claims presented and not yet paid for policies allocated to the Segregated Account, including Deferred Amounts and (ii) accrued interest on Deferred Amounts as required by the amended Segregated Account Rehabilitation Plan that became effective on June 12, 2014. As a result of the Rehabilitation Exit Transactions, as of February 12, 2018, all unpaid claims for policies allocated to the Segregated Account were fully satisfied and discharged.

• The PV of expected net cash flows represents the PV of expected cash outflows less the PV of expected cash inflows. The PV of expected net cash flows are impacted by: (i) expected future claims to be paid under an insurance contract, including the impact of potential settlement outcomes upon future installment premiums, (ii) expected recoveries from contractual breaches of RMBS representations and warranties ("R&W") by transaction sponsors, (iii) excess spread within the underlying transaction's cash flow structure, and (iv) other subrogation recoveries, including expected receipts from third parties within the underlying transaction's cash flow structure. Ambac’s approach to resolving disputes involving contractual breaches by transaction sponsors or other third parties has included negotiations and/or pursuing litigation. Ambac does not include potential recoveries attributed solely to fraudulent inducement claims in our estimate of subrogation recoveries, since any remedies under such claims would be non-contractual.

Net cash outflow policies represent contracts where the sum of unpaid claims plus the PV of expected cash outflows are greater than the PV of expected cash inflows. For such policies, a “Loss and loss expense reserves” liability is recorded for the sum of: (i) unpaid claims plus (ii) the excess of the PV of expected net cash outflows over the unearned premium revenue. Net cash inflow policies represent contracts where losses have been paid, but not yet recovered, such that the PV of expected cash inflows are greater than the sum of unpaid claims plus the PV of expected cash outflows. For such policies, a “Subrogation recoverable” asset is recorded for the difference between (i) the PV of expected net cash inflows and (ii) unpaid claims.

The approaches used to estimate expected future claims and expected future recoveries considers the likelihood of all possible outcomes. The evaluation process for determining expected losses is subject to material estimates and judgments based on our assumptions regarding the probability of default by the issuer of the insured security, probability of settlement outcomes (which may include commutation settlements, refinancing and/or other settlements), expected severity of credits for each insurance contract and the timing of expected events including default, commutation and recovery. Ambac’s loss reserves are based on management’s on-going review of the financial guarantee credit portfolio. Below are the components of the Loss and loss expense reserves liability and the Subrogation recoverable asset at March 31, 2018 and December 31, 2017:

	Unpaid Claims				Present Value of Expected Net Cash Flows
Balance Sheet Line Item	Claims		Accrued Interest		Claims and Loss Expenses		Recoveries			Unearned Premium Revenue			Gross Loss and Loss Expense Reserves
March 31, 2018:
Loss and loss expense reserves	$	—	$	—	$	2,592,778	$	(324,936	)	$	(128,741	)	$	2,139,101
Subrogation recoverable	—		—		275,425		(2,170,203		)	—			(1,894,778		)
Totals	$	—	$	—	$	2,868,203	$	(2,495,139	)	$	(128,741	)	$	244,323
December 31, 2017:
Loss and loss expense reserves	$	2,411,632	$	667,988	$	2,855,010	$	(1,054,113	)	$	(135,502	)	$	4,745,015
Subrogation recoverable	615,391		171,755		102,171		(1,520,530		)	—			(631,213		)
Totals	$	3,027,023	$	839,743	$	2,957,181	$	(2,574,643	)	$	(135,502	)	$	4,113,802

Below is the loss and loss expense reserve roll-forward, net of subrogation recoverable and reinsurance, for the affected periods:

	Three Months Ended March 31,
	2018			2017
Beginning gross loss and loss expense reserves	$	4,113,802		$	3,696,038
Reinsurance recoverable	40,658			30,767
Beginning balance of net loss and loss expense reserves	4,073,144			3,665,271
Losses and loss expenses (benefit):
Current year	778			1,543
Prior year	(248,173		)	133,468
Total (1) (2) (3)	(247,395		)	135,011
Loss and loss expenses (recovered) paid:
Current year	—			696
Prior year (3)	3,631,177			9,749
Total	3,631,177			10,445
Foreign exchange effect	11,016			5,827
Ending net loss and loss expense reserves	205,588			3,795,664
Reinsurance recoverable (4)	38,735			34,691
Ending gross loss and loss expense reserves (5)	$	244,323		$	3,830,355

(1) Total losses and loss expenses (benefit) includes $1,354 and $(4,112) for the three months ended March 31, 2018 and 2017, respectively, related to ceded reinsurance.

(2) Ambac records the impact of estimated recoveries related to securitized loans in RMBS transactions that breached certain R&Ws within losses and loss expenses (benefit). The losses and loss expense (benefit) incurred associated with changes in estimated representation and warranties for the three months ended March 31, 2018 and 2017 was $800 and $13,797, respectively.

(3) On February 12, 2018, Deferred Amounts and Interest Accrued on Deferred Amounts in the amount of $3,000,158 and $856,834, respectively were settled in connection with the Rehabilitation Exit Transactions. 2018 includes a $288,204 loss and loss expense benefit on these settled Deferred Amounts.

(4) Represents reinsurance recoverable on future loss and loss expenses. Additionally, the Balance Sheet line "Reinsurance recoverable on paid and unpaid losses" includes reinsurance recoverables (payables) of $90 and $(418) as of March 31, 2018 and 2017, respectively, related to previously presented loss and loss expenses and subrogation.

(5) Includes Euro denominated gross loss and loss expense reserves of $21,398 (€17,366) and $20,984 (€19,639) at March 31, 2018 and 2017, respectively.

For 2018, the net positive development in prior years was primarily a result of the discount recorded on the Rehabilitation Exit Transactions partially offset by negative development in the RMBS portfolio and interest accrued on Deferred Amounts prior to the Rehabilitation Exit Transactions.

For 2017, the net adverse development in prior years was primarily driven by certain public finance transactions, primarily Puerto Rico, and interest accrued on Deferred Amounts partially offset by positive development in certain Ambac UK transactions, primarily Ballantyne. OnMarch 25, 2017, Ambac UK agreed in principle to a confidential settlement of litigation brought by Ambac UK in the name of Ballantyne against J.P. Morgan Investment Management Inc. ("JPMIM") relating to the management of Ballantyne’s investment accounts, which were funded with the proceeds of notes issued in 2006 in connection with a structured reinsurance transaction and guaranteed in part by Ambac UK. On April 11, 2017, Ambac UK, Ballantyne and JPMIM signed a settlement agreement. Pursuant to the settlement, Ballantyne received a payment of $325,600 from JPMIM in return for releases of all claims by Ballantyne and Ambac UK. As a result of the settlement, Ambac recognized an incremental benefit through a reduction in losses and loss expenses of approximately $91,600 in the first quarter of 2017. The total benefit recognized from the settlement of the litigation will reduce the ultimate Ballantyne claims Ambac UK is expecting to pay and did not result in a direct cash payment to Ambac UK.

The tables below summarize information related to policies currently included in Ambac’s loss and loss expense reserves or subrogation recoverable at March 31, 2018 and December 31, 2017. Gross par exposures include capital appreciation bonds which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bond. The weighted average risk-free rate used to discount loss reserves at March 31, 2018 and December 31, 2017 was 2.8% and 2.5%, respectively.

Surveillance Categories as of March 31, 2018
	I			IA			II			III			IV			V			Total
Number of policies	25			26			15			23			157			4			250
Remaining weighted-average contract period (in years) (1)	10			22			10			23			12			4			16
Gross insured contractual payments outstanding:
Principal	$	967,427		$	576,858		$	642,281		$	2,013,845		$	6,350,960		$	48,562		$	10,599,933
Interest	500,680			601,901			243,259			7,195,260			2,359,913			16,332			10,917,345
Total	$	1,468,107		$	1,178,759		$	885,540		$	9,209,105		$	8,710,873		$	64,894		$	21,517,278
Gross undiscounted claim liability	$	4,264		$	56,682		$	59,584		$	1,449,879		$	2,543,988		$	64,861		$	4,179,258
Discount, gross claim liability	(514		)	(13,866		)	(9,724		)	(693,598		)	(675,210		)	(5,113		)	(1,398,025		)
Gross claim liability before all subrogation and before reinsurance	3,750			42,816			49,860			756,281			1,868,778			59,748			2,781,233
Less:
Gross RMBS subrogation (2)	—			—			—			—			(1,861,894		)	—			(1,861,894		)
Discount, RMBS subrogation	—			—			—			—			28,384			—			28,384
Discounted RMBS subrogation, before reinsurance	—			—			—			—			(1,833,510		)	—			(1,833,510		)
Less:
Gross other subrogation (3)	—			(8,604		)	(4		)	(53,703		)	(675,089		)	(13,138		)	(750,538		)
Discount, other subrogation	—			5,810			—			9,497			69,630			3,972			88,909
Discounted other subrogation, before reinsurance	—			(2,794		)	(4		)	(44,206		)	(605,459		)	(9,166		)	(661,629		)
Gross claim liability, net of all subrogation and discounts, before reinsurance	3,750			40,022			49,856			712,075			(570,191		)	50,582			286,094
Less: Unearned premium revenue	(1,586		)	(10,092		)	(9,810		)	(44,754		)	(62,241		)	(258		)	(128,741		)
Plus: Loss expense reserves	16,141			3,082			582			11,146			56,019			—			86,970
Gross loss and loss expense reserves	$	18,305		$	33,012		$	40,628		$	678,467		$	(576,413	)	$	50,324		$	244,323
Reinsurance recoverable reported on Balance Sheet (4)	$	238		$	4,448		$	8,368		$	38,603		$	(12,832	)	$	—		$	38,825

(1) Remaining weighted-average contract period is weighted based on projected gross claims over the lives of the respective policies.

(2) RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for representation and warranty ("R&W") breaches.

(3) Other subrogation represents subrogation related to excess spread and other contractual cash flows on public finance and structured finance transactions, including RMBS.

(4) Reinsurance recoverable reported on the Balance Sheet includes reinsurance recoverables of $38,735 related to future loss and loss expenses and $90 related to presented loss and loss expenses and subrogation.

Surveillance Categories as of December 31, 2017
	I			IA			II			III			IV			V			Total
Number of policies	26			20			26			22			179			4			277
Remaining weighted-average contract period (in years) (1)	10			23			10			24			13			4			17
Gross insured contractual payments outstanding:
Principal	$	1,046,267		$	531,190		$	1,199,909		$	1,998,861		$	6,862,281		$	48,562		$	11,687,070
Interest	531,657			584,098			413,045			7,182,715			2,469,765			16,332			11,197,612
Total	$	1,577,924		$	1,115,288		$	1,612,954		$	9,181,576		$	9,332,046		$	64,894		$	22,884,682
Gross undiscounted claim liability (2)	$	4,434		$	56,659		$	77,289		$	1,412,976		$	6,409,340		$	64,863		$	8,025,561
Discount, gross claim liability	(465		)	(13,095		)	(12,250		)	(643,897		)	(616,559		)	(4,739		)	(1,291,005		)
Gross claim liability before all subrogation and before reinsurance	3,969			43,564			65,039			769,079			5,792,781			60,124			6,734,556
Less:
Gross RMBS subrogation (3)	—			—			—			—			(1,857,502		)	—			(1,857,502		)
Discount, RMBS subrogation	—			—			—			—			23,115			—			23,115
Discounted RMBS subrogation, before reinsurance	—			—			—			—			(1,834,387		)	—			(1,834,387		)
Less:
Gross other subrogation (4)	—			(7,990		)	(9,371		)	(53,070		)	(743,456		)	(13,191		)	(827,078		)
Discount, other subrogation	—			5,169			2,550			8,349			67,045			3,709			86,822
Discounted other subrogation, before reinsurance	—			(2,821		)	(6,821		)	(44,721		)	(676,411		)	(9,482		)	(740,256		)
Gross claim liability, net of all subrogation and discounts, before reinsurance	3,969			40,743			58,218			724,358			3,281,983			50,642			4,159,913
Less: Unearned premium revenue	(2,126		)	(9,990		)	(12,238		)	(46,086		)	(64,786		)	(276		)	(135,502		)
Plus: Loss expense reserves	16,116			3,242			665			13,331			56,037			—			89,391
Gross loss and loss expense reserves	$	17,959		$	33,995		$	46,645		$	691,603		$	3,273,234		$	50,366		$	4,113,802
Reinsurance recoverable reported on Balance Sheet (5)	$	202		$	4,894		$	9,424		$	38,465		$	(11,988	)	$	—		$	40,997

(1) Remaining weighted-average contract period is weighted based on projected gross claims over the lives of the respective policies.

(2) Gross undiscounted claim liability includes unpaid claims, including accrued interest on Deferred Amounts, on policies allocated to the Segregated Account and Ambac's estimate of expected future claims.

(3) RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for R&W breaches.

(4) Other subrogation represents subrogation related to excess spread and other contractual cash flows on public finance and structured finance transactions, including RMBS.

(5) Reinsurance recoverable reported on Balance Sheet includes reinsurance recoverables of $40,658 related to future loss and loss expenses and $339 related to presented loss and loss expenses and subrogation.

Puerto Rico:

Ambac has exposure to the Commonwealth of Puerto Rico (the "Commonwealth") and its instrumentalities across several different issuing entities. Each has its own credit risk profile attributable to discrete revenue sources, direct general obligation pledges and general obligation guarantees. The Commonwealth of Puerto Rico and certain of its instrumentalities have and will continue to default on debt service payments, including payments owed on bonds insured by Ambac Assurance. Ambac Assurance may be required to make significant amounts of policy payments over the next several years, the recoverability of which is subject to great uncertainty, which may lead to material permanent losses. Our exposure to Puerto Rico is impacted by the amount of monies available for debt service, which is in turn affected by variability in economic growth, tax revenues, essential services expense as well as federal funding of Commonwealth needs. In addition, our exposure to Puerto Rico is impacted by the significant damage to the Commonwealth that was inflicted by Hurricane Maria, which made landfall on September 20, 2017, as well as Hurricane Irma, which passed just north of the island on September 6, 2017. The longer term recovery of the economy of the Commonwealth and its essential infrastructure will likely be highly dependent on, amongst other factors, the amount, timing and effectiveness of Federal aid.

Substantial uncertainty also exists with respect to the ultimate outcome for creditors in Puerto Rico due to legislation enacted by the Commonwealth and the United States, including PROMESA, as well as actions taken in reliance on such laws, including Title III filings. Ambac Assurance is involved in multiple litigations relating to such actions and other issues and may not be successful in pursuing claims or protecting its interests. Ambac Assurance is also participating in a mediation process with respect to potential debt restructurings. Mediation may not be productive or may not resolve Ambac Assurance's claims in a manner that avoids significant losses. It is possible that certain restructuring process solutions, together with associated legislation, budgetary, and/or public policy proposals could be adopted and could significantly or further impair our exposures.

While our reserving scenarios reflect a wide range of possible outcomes reflecting the significant uncertainty regarding future developments and outcomes, given our exposure to Puerto Rico and the economic, fiscal, legal and political uncertainties associated therewith as well as the uncertainties emanating from the damage caused by hurricanes Maria and Irma, our loss reserves may ultimately prove to be insufficient to cover our losses, potentially by a material amount, and may be subject to material volatility.

Ambac has considered these developments and other factors in evaluating its Puerto Rico loss reserves. During the three months ended March 31, 2018, Ambac had an incurred benefit associated with its Domestic Public Finance insured portfolio of $11,273, which was significantly impacted by an increase in loss reserve discount rates, partially offset by the continued uncertainty and volatility of the situation in Puerto Rico. While management believes its reserves are adequate to cover losses in its Public Finance insured portfolio, there can be no assurance that Ambac may not incur additional losses in the future, particularly given the developing economic, political, and legal circumstances in Puerto Rico. Such additional losses may have a material adverse effect on Ambac’s results of operations and financial condition. For public finance credits, including Puerto Rico, as well as other issuers, for which Ambac has an estimate of expected loss at March 31, 2018, the possible increase in loss reserves under stress or other adverse conditions and circumstances was estimated to be approximately $1,340,000. However, there can be no assurance that losses may not exceed such amount.

Representation and Warranty Recoveries:

Ambac records estimated subrogation recoveries for breaches of R&Ws by sponsors of certain RMBS transactions. For a discussion of the approach utilized to estimate R&W subrogation recoveries, see Note 2. Basis of Presentation and Significant Accounting Policiesin the Notes to Consolidated Financial Statements included Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. R&W subrogation may include estimates of potential sponsor settlements which have not been subject to a sampling approach. However, such estimates are not material to Ambac’s financial results and therefore are included in the below table.

Ambac has recorded R&W subrogation recoveries of $1,833,510 ($1,805,936 net of reinsurance) and $1,834,387 ($1,806,736 net of reinsurance) at March 31, 2018 and December 31, 2017, respectively. The balance of R&W subrogation recoveries and the related loss reserves at March 31, 2018 and December 31, 2017, are as follows:

	Gross Loss Reserves Before Subrogation Recoveries (1)		Subrogation Recoveries (2)(3)			Gross Loss Reserves After Subrogation Recoveries
At March 31, 2018	$	171,999	$	(1,833,510	)	$	(1,661,511	)
At December 31, 2017	$	1,366,483	$	(1,834,387	)	$	(467,904	)

(1) Amount represents gross loss reserves for policies that have established a representation and warranty subrogation recovery.December 31, 2017 includes unpaid RMBS claims (including accrued interest on Deferred Amounts) on policies allocated to the Segregated Account, such balances have been settled via the Rehabilitation Exit Transactions.

(2) The amount of recorded subrogation recoveries related to each securitization is limited to ever-to-date paid and unpaid losses plus the present value of expected future cash flows for each policy. To the extent losses have been paid but not yet fully recovered, the recorded amount of R&W subrogation recoveries may exceed the sum of the unpaid claims and the present value of expected cash out flows for a given policy. The net cash inflow for these policies is recorded as a “Subrogation recoverable” asset. For those transactions where the subrogation recovery is less than the sum of unpaid claims and the present value of expected cash flows, the net cash outflow for these policies is recorded as a “Loss and loss expense reserves” liability.

(3) The sponsor’s repurchase obligation may differ depending on the terms of the particular transaction and the status of the specific loan, such as whether it is performing or has been liquidated or charged off.

Below is the rollforward of R&W subrogation for the affected periods:

	Three Months Ended March 31,
	2018			2017
Discounted R&W subrogation (gross of reinsurance) at beginning of period	$	1,834,387		$	1,907,035
Changes recognized during the period:
All other changes (1)	(877		)	(14,061		)
Discounted R&W subrogation (gross of reinsurance) at end of period	$	1,833,510		$	1,892,974

(1) All other changes which may impact R&W subrogation recoveries include changes in actual or projected collateral performance, changes in the creditworthiness of a sponsor and/or the projected timing of recoveries. All other changes may also include estimates of potential sponsor settlements that may not have been subject to a sampling approach. Those that have not been subject to a sampling approach are not material to Ambac’s financial results and therefore are included in this table.

Our ability to realize R&W subrogation recoveries is subject to significant uncertainty, including risks inherent in litigation, collectability of such amounts from counterparties (and/or their respective parents and affiliates), timing of receipt of any such recoveries, intervention by OCI, which could impede our ability to take actions required to realize such recoveries, and uncertainty inherent in the assumptions used in estimating such recoveries.

Insurance intangible asset:

The insurance intangible amortization expense is included in insurance intangible amortization on the Consolidated Statements of Total Comprehensive Income (Loss). For the three months ended March 31, 2018 and 2017, the insurance intangible amortization expense was $28,636 and $37,525, respectively. As of March 31, 2018 and December 31, 2017, the gross carrying value of the insurance intangible asset was $1,601,066 and $1,581,156, respectively. Accumulated amortization of the insurance intangible asset was $768,026 and $734,183, as of March 31, 2018 and December 31, 2017, respectively, resulting in a net insurance intangible asset of $833,040 and $846,973, respectively.

The estimated future amortization expense for the net insurance intangible asset is as follows:

	2018		2019		2020		2021		2022		Thereafter
Amortization expense (1)	$	55,687	$	68,517	$	63,475	$	57,891	$	53,816	$	533,654

(1) Future amortization considers the use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay certain obligations. If those bonds types are retired early, amortization expense may differ in the period of call or refinancing.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

7. FAIR VALUE MEASUREMENTS

The Fair Value Measurement Topic of the ASC establishes a framework for measuring fair value and disclosures about fair value measurements.

Fair Value Hierarchy:

The Fair Value Measurement Topic of the ASC specifies a fair value hierarchy based on whether the inputs to valuation techniques used to measure fair value are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect Company-based assumptions. The fair value hierarchy prioritizes model inputs into three broad levels as follows:

l	Level 1	Quoted prices for identical instruments in active markets. Assets and liabilities classified as Level 1 include US Treasury and other foreign government obligations traded in highly liquid and transparent markets, exchange traded futures contracts, variable rate demand obligations and money market funds.
l	Level 2	Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets. Assets and liabilities classified as Level 2 generally include investments in fixed income securities representing municipal, asset-backed and corporate obligations, certain interest rate swap contracts and most long-term debt of variable interest entities consolidated under the Consolidation Topic of the ASC.
l	Level 3	Model derived valuations in which one or more significant inputs or significant value drivers are unobservable. This hierarchy requires the use of observable market data when available. Assets and liabilities classified as Level 3 include credit derivative contracts, certain uncollateralized interest rate swap contracts, equity interests in Ambac sponsored special purpose entities and certain investments in fixed income securities. Additionally, Level 3 assets and liabilities generally include loan receivables, and certain long-term debt of variable interest entities consolidated under the Consolidation Topic of the ASC.

The following table sets forth the carrying amount and fair value of Ambac’s financial assets and liabilities as of March 31, 2018 and December 31, 2017, including the level within the fair value hierarchy at which fair value measurements are categorized. As required by the Fair Value Measurement Topic of the ASC, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

	Carrying Amount			Total Fair Value			Fair Value Measurements Categorized as:
March 31, 2018:							Level 1		Level 2			Level 3
Financial assets:
Fixed income securities:
Municipal obligations	$	855,387		$	855,387		$	—	$	855,387		$	—
Corporate obligations	1,438,993			1,438,993			450		1,438,543			—
Foreign obligations	26,395			26,395			25,492		903			—
U.S. government obligations	87,261			87,261			87,261		—			—
Residential mortgage-backed securities	823,296			823,296			—		817,987			5,309
Collateralized debt obligations	50,958			50,958			—		50,958			—
Other asset-backed securities	589,648			589,648			—		517,327			72,321
Fixed income securities, pledged as collateral:
U.S. government obligations	84,240			84,240			84,240		—			—
Short term investments	321,119			321,119			269,171		51,948			—
Other investments (1)	419,896			402,072			57,535		—			18,385
Cash and cash equivalents	38,485			38,485			35,033		3,452			—
Loans	10,643			12,042			—		—			12,042
Derivative assets:
Interest rate swaps—asset position	60,198			60,198			—		9,272			50,926
Interest rate swaps—liability position	(2		)	(2		)	—		(2		)	—
Other assets	5,621			5,621			—		—			5,621
Variable interest entity assets:
Fixed income securities:
Corporate obligations	2,955,763			2,955,763			—		—			2,955,763
Restricted cash	1,134			1,134			1,134		—			—
Loans	11,558,331			11,558,331			—		—			11,558,331
Derivative assets:
Currency swaps-asset position	46,260			46,260			—		46,260			—
Total financial assets	$	19,289,386		$	19,272,961		$	476,076	$	3,792,035		$	14,678,698
Financial liabilities:
Long term debt, including accrued interest	$	3,201,931		$	3,265,029		$	—	$	2,651,952		$	613,077
Derivative liabilities:
Credit derivatives	1,018			1,018			—		—			1,018
Interest rate swaps—liability position	70,566			70,566			—		70,566			—
Liabilities for net financial guarantees written (2)	(432,722		)	900,880			—		—			900,880
Variable interest entity liabilities:
Long-term debt	12,270,124			12,270,124			—		9,573,607			2,696,517
Derivative liabilities:
Interest rate swaps—liability position	2,155,456			2,155,456			—		2,155,456			—
Total financial liabilities	$	17,266,373		$	18,663,073		$	—	$	14,451,581		$	4,211,492

	Carrying Amount			Total Fair Value			Fair Value Measurements Categorized as:
December 31, 2017:							Level 1		Level 2			Level 3
Financial assets:
Fixed income securities:
Municipal obligations	$	779,834		$	779,834		$	—	$	779,834		$	—
Corporate obligations	860,075			860,075			450		859,625			—
Foreign obligations	26,543			26,543			25,615		928			—
U.S. government obligations	85,408			85,408			85,408		—			—
Residential mortgage-backed securities	2,251,333			2,251,333			—		1,515,316			736,017
Collateralized debt obligations	51,037			51,037			—		51,037			—
Other asset-backed securities	597,942			597,942			—		525,402			72,540
Fixed income securities, pledged as collateral:
U.S. government obligations	99,719			99,719			99,719		—			—
Short term investments	557,270			557,270			389,299		167,971			—
Other investments (1)	431,630			413,977			56,498		29,750			17,288
Cash and cash equivalents	623,703			623,703			615,073		8,630			—
Loans	10,358			10,284			—		—			10,284
Derivative assets:
Interest rate swaps—asset position	73,199			73,199			—		11,825			61,374
Other assets	5,979			5,979			—		—			5,979
Variable interest entity assets:
Fixed income securities:
Corporate obligations	2,914,145			2,914,145			—		—			2,914,145
Restricted cash	978			978			978		—			—
Loans	11,529,384			11,529,384			—		—			11,529,384
Derivative assets:
Currency swaps—asset position	54,877			54,877			—		54,877			—
Total financial assets	$	20,853,695		$	20,835,968		$	1,173,321	$	4,005,195		$	15,347,011
Financial liabilities:
Long term debt, including accrued interest	$	1,428,680		$	1,369,499		$	—	$	1,046,511		$	322,988
Derivative liabilities:
Credit derivatives	566			566			—		—			566
Interest rate swaps—asset position	(627		)	(627		)	—		(627		)	—
Interest rate swaps—liability position	81,495			81,495			—		81,495			—
Futures contracts	1,348			1,348			1,348		—			—
Liabilities for net financial guarantees written (2)	3,435,438			4,842,402			—		—			4,842,402
Variable interest entity liabilities:
Long-term debt	12,160,544			12,160,544			—		9,402,856			2,757,688
Derivative liabilities:
Interest rate swaps—liability position	2,205,264			2,205,264			—		2,205,264			—
Total financial liabilities	$	19,312,708		$	20,660,491		$	1,348	$	12,735,499		$	7,923,644

(1) Excluded from the fair value measurement categories in the table above are investment funds of $326,152 and $310,441 as of March 31, 2018 and December 31, 2017, respectively, which are measured using NAV per share as a practical expedient.

(2) The carrying value of net financial guarantees written includes the following balance sheet items: Premium receivables; Reinsurance recoverable on paid and unpaid losses; Deferred ceded premium; Subrogation recoverable; Insurance intangible asset; Unearned premiums; Loss and loss expense reserves; Ceded premiums payable, premiums taxes payable and other deferred fees recorded in Other liabilities.

Determination of Fair Value:

When available, Ambac uses quoted active market prices specific to the financial instrument to determine fair value, and classifies such items within Level 1. The determination of fair value for financial instruments categorized in Level 2 or 3 involves significant judgment due to the complexity of factors contributing to the valuation. Third-party sources from which we obtain independent market quotes also use assumptions, judgments and estimates in determining financial instrument values and different third parties may use different methodologies or provide different values for financial instruments. In addition, the use of internal valuation models may require assumptions about hypothetical or inactive markets. As a result of these factors, the actual trade value of a financial instrument in the market, or exit value of a financial instrument position by Ambac, may be significantly different from its recorded fair value.

Ambac’s financial instruments carried at fair value are mainly comprised of investments in fixed income securities, equity interests in pooled investment funds, derivative instruments, variable interest entity assets and liabilities and interests in Ambac sponsored special purpose entities. Valuation of financial instruments is performed by Ambac’s finance group using methods approved by senior financial management with consultation from risk management and portfolio managers as appropriate. Preliminary valuation results are discussed with portfolio managers quarterly to assess consistency with market transactions and trends as applicable. Market transactions such as trades or negotiated settlements of similar positions, if any, are reviewed to validate fair value model results. However many of the financial instruments valued using significant unobservable inputs have very little or no observable market activity. Methods and significant inputs and assumptions used to determine fair values across portfolios are reviewed quarterly by senior financial management. Other valuation control procedures specific to particular portfolios are described further below.

We reflect Ambac’s own creditworthiness in the fair value of financial liabilities by including a credit valuation adjustment (“CVA”) in the determination of fair value. A decline (increase) in Ambac’s creditworthiness as perceived by market participants will generally result in a higher (lower) CVA, thereby lowering (increasing) the fair value of Ambac’s financial liabilities as reported.

Fixed Income Securities:

The fair values of fixed income investment securities are based primarily on market prices received from dealer quotes or alternative pricing sources with reasonable levels of price transparency. Because many fixed income securities do not trade on a daily basis, pricing sources apply available market information through processes such as matrix pricing to calculate fair value. Such prices generally consider a variety of factors, including recent trades of the same and similar securities. In those cases, the items are classified within Level 2. For those fixed income investments where quotes were not available or cannot be reasonably corroborated, fair values are based on internal valuation models. Key inputs to the internal valuation models generally include maturity date, coupon and yield curves for asset-type and credit rating characteristics that closely match those characteristics of the specific investment securities being valued. Items valued using valuation models are classified according to the lowest level input or value driver that is significant to the valuation. Thus, an item may be classified in Level 3 even though there may be significant inputs that are readily observable. Longer (shorter) expected maturities or higher (lower) yields used in the valuation model will, in isolation, result in decreases (increases) in fair value. Generally, lower credit ratings or longer expected maturities will be accompanied by higher yields used to value a security. At March 31, 2018, approximately 8%, 90% and 2% of the fixed income investment portfolio (excluding variable interest entity investments) was valued using dealer quotes, alternative pricing sources with reasonable levels of price transparency and internal valuation models, respectively. At December 31, 2017, approximately 6%, 79% and 15% of the fixed income investment portfolio (excluding variable interest entity investments) was valued using dealer quotes, alternative pricing sources with reasonable levels of price transparency and internal valuation models, respectively. At December 31, 2017, among the investments valued using internal valuation models were Ambac insured securities for which projected cash flows consisted solely of Deferred Amounts and interest thereon. These securities were internally valued based upon the valuation of Ambac Assurance's surplus notes and comprised 13% of the portfolio at December 31, 2017.

Ambac performs various review and validation procedures to quoted and modeled prices for fixed income securities, including price variance analyses, missing and static price reviews, overall valuation analysis by senior traders and finance managers and reviews associated with our ongoing impairment analysis. Unusual prices identified through these procedures will be evaluated further against alternative third party quotes (if available) and/or internally modeled prices, and the pricing source values will be challenged as necessary. Price challenges generally result in the use of the pricing source’s quote as originally provided or as revised by the source following their internal diligence process. A price challenge may result in a determination by either the pricing source or Ambac management that the pricing source cannot provide a reasonable value for a security or cannot adequately support a quote, in which case Ambac would resort to using either other quotes or internal models. Results of price challenges are reviewed by senior traders and finance managers.

Information about the valuation inputs for fixed income securities classified as Level 3 is included below:

Residential mortgage-backed securities: A portion of these securities were guaranteed under policies that were subject to the Segregated Account Rehabilitation Plan and had projected future cash flows consisting solely of Deferred Amounts under such policies including interest thereon. As described in Note 1. Background and Business Description, upon consummation of the Rehabilitation Exit Transactions on February 12, 2018, all Deferred Amounts have been settled. The fair value of such securities classified as Level 3 was $0 and $709,950 at March 31, 2018 and December 31, 2017, respectively. Fair value was calculated based on the valuation of Ambac Assurance surplus notes which, under the terms of the Segregated Account Rehabilitation Plan, were to be redeemed in proportion with the payment of Deferred Amounts on or about the dates when such payments were to be made.

The remaining portion of Level 3 residential mortgage-backed securities are an Ambac-insured re-REMIC containing distressed mortgage-backed securities as collateral, the fair value of which was $5,309 at March 31, 2018 and $26,067 as of December 31, 2017. Fair value was calculated using a discounted cash flow approach with expected future cash flows discounted using a yield consistent with the security type and rating. Significant inputs for the valuations at March 31, 2018 and December 31, 2017 were as follows:

March 31, 2018		December 31, 2017:
a. Coupon rate:	2.38%	a. Coupon rate:	2.05%
b. Average Life:	1.42 years	b. Average Life:	0.65 years
c. Yield:	10.00%	c. Yield:	10.00%

Other asset-backed securities: These securities are a subordinated tranche of a resecuritization collateralized by Ambac-insured military housing bonds. The fair value of such securities classified as Level 3 was $72,321 and $72,540 at March 31, 2018 and December 31, 2017, respectively. Fair value was calculated using a discounted cash flow approach with expected future cash flows discounted using a yield consistent with the security type and rating. Significant inputs for the valuation at March 31, 2018 and December 31, 2017 include the following weighted averages:

March 31, 2018:		December 31, 2017:
a. Coupon rate:	5.97%	a. Coupon rate:	5.97%
b. Average Life:	16.84 years	b. Maturity:	17.02 years
c. Yield:	12.00%	c. Yield:	12.00%

Other Investments:

Other investments primarily relate to investments in pooled investment funds. The fair value of pooled investment funds is determined using dealer quotes or alternative pricing sources when such investments have readily determinable fair values. When fair value is not readily determinable, pooled investment funds are valued using the net asset value (“NAV”) per share as a practical expedient as permitted under the Fair Value Measurement Topic of the ASC. Refer to Note 8. Investments for additional information about such investments in pooled funds that are reported at fair value using NAV as a practical expedient.

Other investments also includes Ambac's equity interest in a non-consolidated VIE, which is carried under the equity method. Valuation of this equity interest is internally calculated using a discounted cash flow approach and is classified as Level 3.

Derivative Instruments:

Ambac’s derivative instruments primarily comprise interest rate and credit default swaps and exchange traded futures contracts. Fair value is determined based upon market quotes from independent sources, when available. When independent quotes are not available, fair value is determined using valuation models. These valuation models require market-driven inputs, including contractual terms, credit spreads and ratings on underlying referenced obligations, yield curves and tax-exempt interest ratios. The valuation of certain interest rate as well as all credit derivative contracts also require the use of data inputs and assumptions that are determined by management and are not readily observable in the market. Under the Fair Value Measurement Topic of the ASC, Ambac is required to consider its own credit risk when measuring the fair value of derivatives. Interest rate swaps may also require an adjustment to fair value to reflect Ambac’s credit risk. Additional factors considered in estimating the amount of any Ambac CVA on such contracts include collateral posting provisions, right of set-off with the counterparty, the period of time remaining on the derivative and the pricing of recent terminations.

As described further below, certain valuation models require other inputs that are not readily observable in the market. The selection of a model to value a derivative depends on the contractual terms of, and specific risks inherent in the instrument as well as the availability of pricing information in the market.

Derivatives that are less complex may be valued primarily by reference to interest rates and yield curves that are observable and regularly quoted, such as interest rate swaps, for which we generally utilize vendor-developed models. These models provide the net present value of the derivatives based on contractual terms and observable market data. Downgrades of Ambac Assurance, as guarantor of the derivatives, have increased collateral requirements and triggered termination provisions in certain interest rate swaps. Termination activity since the initial rating downgrades of Ambac Assurance provided additional information about the replacement and/or exit value of certain derivatives, which has been incorporated into the fair value of these derivatives as appropriate. Generally, the need for counterparty (or Ambac) CVAs is mitigated by the existence of collateral posting agreements under which adequate collateral has been posted. Derivative contracts entered into with financial guarantee customers are not subject to collateral posting agreements. Counterparty credit risk related to such customer derivative assets is included in our fair value adjustments.

For derivatives that do not trade, or trade in less liquid markets such as credit derivatives, an internal model is generally used because such instruments tend to be unique, contain complex or heavily modified and negotiated terms and pricing information is not readily available in the market. Derivative fair value models and the related assumptions are continuously re-evaluated by management and enhanced, as appropriate, based on improvements in modeling techniques. Ambac has not made any significant changes to its modeling techniques or related model inputs for the periods presented.

Credit Derivatives (“CDS”):

Fair value of Ambac’s CDS is determined using internal valuation models and represents the hypothetical transfer cost of the contract calculated as the difference between the net present value of the projected fees receivable under the CDS and our estimate of the fees a financial guarantor of comparable credit quality would charge to provide the same protection at the balance sheet date. Financial guarantee contracts, including CDS, are typically priced to capture some portion of the spread that would be observed in the capital markets for the underlying (insured) obligation. Because of this relationship and in the absence of severe credit deterioration, changes in the fair value of our credit default swaps will generally be less than changes in the fair value of the underlying reference obligations.

Key variables used in the valuation of our credit derivatives include the balance of unpaid notional, expected term, fair values of the underlying reference obligations, reference obligation credit ratings and the CVA applied against Ambac Assurance liabilities by market participants. Notional balances, expected remaining term and reference obligation credit ratings are monitored and determined by Ambac’s portfolio risk management group. Fair values of the underlying reference obligations are obtained from broker quotes when available or are estimated internally using the same methodologies used to value Ambac’s fixed income securities in its investment portfolio.

Ambac reflects changes in reference obligation credit ratings within the fair value of its CDS contracts by changing the percentage of the obligation's market spread (over LIBOR) that would be captured as a CDS fee at the valuation date. We adjust this percentage (“relative change ratio”) in our valuations based on internal rating changes such that the resulting fair value liability of the CDS contract, excluding the effect of Ambac's own credit risk, will increase up to the full amount of the unrealized loss on the reference obligation as the credit rating declines. Ambac incorporates its own credit risk into the valuation of its CDS liabilities by applying a CVA to the calculations described above. The Ambac CVA represents the difference between the present value of the hypothetical fees discounted at LIBOR compared to discount rates that incorporate Ambac credit risk.

Information about the above described model inputs used to determine the fair value of credit derivatives, including the CVA as a percentage of the gross mark-to-market liability before considering Ambac credit risk (“CVA percentage”), as of March 31, 2018 and December 31, 2017 is summarized below:

	March 31, 2018				December 31, 2017
Number of CDS transactions		2			2
Notional outstanding		$	330,656		$	325,890
Weighted average reference obligation price		98.6			99.3
Weighted average life (WAL) in years		6.3			6.5
Weighted average credit rating		A			A
Weighted average relative change ratio		23.4		%	23.6		%
CVA percentage		9.25		%	9.64		%
Fair value of derivative liabilities		$	1,018		$	566

The maximum potential amount of future payments under Ambac’s credit derivative contracts is generally the gross notional outstanding amount included in the above table plus future interest payments by the derivative reference obligations. Since Ambac’s credit derivatives typically reference obligations of or assets held by special purpose entities that meet the definition of a VIE, the amount of maximum potential future payments for credit derivatives is included in the table in Note 3. Special Purpose Entities, Including Variable Interest Entities.

Changes in fair value are recorded in “Net change in fair value of credit derivatives” on the Consolidated Statements of Total Comprehensive Income (Loss). Although CDS contracts are accounted for at fair value, they are surveilled similar to non-derivative financial guarantee contracts. As with financial guarantee insurance policies, Ambac’s Risk Management group tracks credit migration of CDS contracts’ reference obligations from period to period. Credits are assigned risk classifications by the Risk Management group. As of March 31, 2018, there are no CDS contracts on Ambac’s adversely classified credit listing.

Significant unobservable inputs for credit derivatives include WAL, internal credit rating, relative change ratio and CVA percentage. A longer (shorter) WAL, lower (higher) reference obligation credit rating, higher (lower) relative change ratio or lower (higher) CVA, in isolation, would result in an increase (decrease) in the fair value liability measurement. A change in an internal credit rating of a reference obligation in our model will generally result in a directionally opposite change in the relative change ratio. Also, a shorter (longer) WAL will generally correspond with a lower (higher) CVA percentage.

Financial Guarantees:

Fair value of net financial guarantees written represents our estimate of the cost to Ambac to completely transfer its insurance obligation to another market participant of comparable credit worthiness. In theory, this amount should be the same amount that another market participant of comparable credit worthiness would hypothetically charge in the market place, on a present value basis, to provide the same protection as of the balance sheet date. This fair value estimate of financial guarantees is presented on a net basis and includes direct and assumed contracts written, net of ceded reinsurance contracts.

The fair value estimate of financial guarantees is computed by utilizing cash flows calculated at the policy level. For direct and assumed contracts, net cash flows for each policy includes future: (i) installment premium receipts, (ii) gross claim payments, (iii) subrogation receipts, and, (iv) at December 31, 2017, unpaid claims on claims presented and not yet paid for policies allocated to the Segregated Account, including Deferred Amounts and interest thereon. The timing of future claim payments of the Segregated Account was at the sole discretion of the Rehabilitator until the Segregated Account rehabilitation was concluded on February 12, 2018. For ceded reinsurance contracts, net cash flows for each policy includes future: (i) installment ceded premium payments, (ii) ceding commission receipts, (iii) ceded claim receipts, and (iv) ceded subrogation payments. For each assumed,or ceded reinsurance contract, the respective undiscounted cash flow components are aggregated to determine if we are in a net asset or net liability position. U.S. GAAP requires that the nonperformance risk of a financial liability be included in the estimation of fair value, which includes considering Ambac Assurance’s own credit risk. Accordingly, for each contract in a net liability position, we estimate the fair value using internally developed discount rates and market pricing that incorporate Ambac’s own credit risk and subsequently apply a profit margin. This profit margin represents what another market participant would require to assume the financial guarantee contracts. A profit margin was developed based on discussions with the third-party institutions with valuation expertise and discussions with industry participants. The discount rates used for contracts in a net liability position are derived from the rates implicit in the fair value of surplus notes and guaranteed securities with future cash flows that are highly dependent upon Ambac financial guarantee payments. For each contract in a net asset position, we estimate the fair value using a discount rate that is commensurate with a hypothetical buyer’s cost of capital.

This methodology is based on management’s expectations of how a market participant would estimate net cash flows. We are aware of a number of factors that may cause such fair or exit value to differ, perhaps materially. For example, (i) since no financial guarantor with Ambac Assurance’s credit quality is writing or otherwise obtaining financial guarantee business (e.g. reinsurance or novation of policies from other insurers) we do not have access to observable pricing data points and (ii) at December 31, 2017, certain segments of Ambac's financial guarantees were allocated to the Segregated Account and timing of the payments of such liabilities were at the sole discretion of the Rehabilitator.

Long-term Debt:

Long-term debt includes Ambac Assurance senior surplus notes and junior surplus notes, notes outstanding to third parties arising from Ambac Assurance's secured borrowing transaction and the Ambac Note and Tier 2 Notes issued in connection with the Rehabilitation Exit Transactions. The fair values of senior surplus notes, the secured borrowing notes and the Ambac Note are classified as Level 2. The fair value of junior surplus notes and Tier 2 Notes are classified as Level 3.

Other Financial Assets and Liabilities:

The fair values of Loans and Ambac’s equity interest in Ambac sponsored special purpose entities (included in Other assets) are estimated based upon internal valuation models and are classified as Level 3.

Variable Interest Entity Assets and Liabilities:

The financial assets and liabilities of VIEs consolidated under the Consolidation Topic of the ASC consist primarily of fixed income securities, loans, derivative and debt instruments and are generally carried at fair value. These consolidated VIEs are securitization entities which have liabilities and/or assets guaranteed by Ambac Assurance. The fair values of VIE debt instruments are determined using the same methodologies used to value Ambac’s fixed income securities in its investment portfolio as described above. VIE debt fair value is based on market prices received from dealer quotes or alternative pricing sources with reasonable levels of price transparency. Such quotes are considered Level 2 and generally consider a variety of factors, including recent trades of the same and similar securities. For those VIE debt instruments where quotes were not available, the debt instrument fair values are considered Level 3 and are based on internal discounted cash flow models. Comparable to the sensitivities of investments in fixed income securities described above, longer (shorter) expected maturities or higher (lower) yields used in the valuation model will, in isolation, result in decreases (increases) in fair value liability measurement for VIE debt. VIE debt instruments considered Level 3 include fixed rate, floating rate and zero coupon notes secured by various asset types, primarily European ABS. Information about the valuation inputs for the various VIE debt categories classified as Level 3 is as follows:

European ABS transactions: The fair value of such obligations classified as Level 3 was $2,696,517 and $2,757,688 at March 31, 2018 and December 31, 2017, respectively. Fair values were calculated by using a discounted cash flow approach. The discount rates used were based on the rates implied from the third party quoted values for comparable notes from the same securitization entity. Significant inputs for the valuation at March 31, 2018 and December 31, 2017 include the following weighted averages:

March 31, 2018:		December 31, 2017:
a. Coupon rate:	0.37%	a. Coupon rate:	0.40%
b. Maturity:	15.06 years	b. Maturity:	15.28 years
c. Yield:	5.35%	c. Yield:	4.82%

VIE derivative asset and liability fair values are determined using valuation models. When specific derivative contractual terms are available and may be valued primarily by reference to interest rates, foreign exchange rates and yield curves that are observable and regularly quoted, the derivatives are valued using vendor-developed models. Other derivatives within the VIEs that include significant unobservable valuation inputs are valued using internally developed models. VIE derivative fair value balances at March 31, 2018 and December 31, 2017 were developed using vendor-developed models and do not use significant unobservable inputs.

The fair value of VIE assets are obtained from market quotes when available. Typically VIE asset fair values are not readily available from market quotes and are estimated internally. The consolidated VIEs are securitization entities in which net cash flows from assets and derivatives (after adjusting for financial guarantor cash flows and other expenses) will be paid out to note holders or equity interests. Our valuation of VIE assets (fixed income securities or loans), therefore, are derived from the fair value of notes and derivatives, as described above, adjusted for the fair value of cash flows from Ambac’s financial guarantee. The fair value of financial guarantee cash flows include: (i) estimated future premiums discounted at a rate consistent with that implicit in the fair value of the VIE’s liabilities and (ii) internal estimates of future loss payments by Ambac discounted at a rate that includes Ambac’s own credit risk. Estimated future premium payments to be paid by the VIEs were discounted at a weighted average rate of 3.3% and 3.1% at March 31, 2018 and December 31, 2017, respectively. The value of future loss payments to be paid by Ambac to the VIEs was adjusted to include an Ambac CVA appropriate for the term of expected Ambac claim payments.

Additional Fair Value Information for Financial Assets and Liabilities Accounted for at Fair Value:

The following tables present the changes in the Level 3 fair value category for the periods presented in 2018 and 2017. Ambac classifies financial instruments in Level 3 of the fair value hierarchy when there is reliance on at least one significant unobservable input to the valuation model. In addition to these unobservable inputs, the valuation models for Level 3 financial instruments typically also rely on a number of inputs that are readily observable either directly or indirectly. Thus, the gains and losses presented below include changes in the fair value related to both observable and unobservable inputs.

Level 3 - Financial Assets and Liabilities Accounted for at Fair Value
										VIE Assets and Liabilities
	Investments			Other Assets			Derivatives			Investments			Loans			Long-term Debt			Total
Three Months Ended March 31, 2018:
Balance, beginning of period	$	808,557		$	5,979		$	60,808		$	2,914,145		$	11,529,384		$	(2,757,688	)	$	12,561,185
Total gains/(losses) realized and unrealized:
Included in earnings	35,184			(358		)	(9,375		)	(69,026		)	(202,588		)	159,985			(86,178		)
Included in other comprehensive income	(52,508		)	—			—			110,644			423,892			(103,877		)	378,151
Purchases	—			—			—			—			—			—			—
Issuances	—			—			—			—			—			—			—
Sales	—			—			—			—			—			—			—
Settlements	(713,603		)	—			(1,525		)	—			(192,357		)	5,064			(902,421		)
Transfers into Level 3	—			—			—			—			—			—			—
Transfers out of Level 3	—			—			—			—			—			—			—
Balance, end of period	$	77,630		$	5,621		$	49,908		$	2,955,763		$	11,558,331		$	(2,696,516	)	$	11,950,737
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	—		$	(358	)	$	(9,481	)	$	(69,026	)	$	(202,588	)	$	159,985		$	(121,468	)
Three Months Ended March 31, 2017:
Balance, beginning of period	$	762,703		$	7,382		$	(100,282	)	$	2,622,566		$	10,658,963		$	(2,582,220	)	$	11,369,112
Total gains/(losses) realized and unrealized:
Included in earnings	9,819			(343		)	(2,817		)	(5,195		)	346,192			(94,407		)	253,249
Included in other comprehensive income	6,285			—			—			46,348			183,549			(46,257		)	189,925
Purchases	9,851			—			—			—			—			—			9,851
Issuances	—			—			—			—			—			—			—
Sales	(79,319		)	—			—			—			—			—			(79,319		)
Settlements	(9,793		)	—			511			—			(173,399		)	6,242			(176,439		)
Transfers into Level 3	22,078			—			—			—			—			—			22,078
Transfers out of Level 3	—			—			—			—			—			—			—
Balance, end of period	$	721,624		$	7,039		$	(102,588	)	$	2,663,719		$	11,015,305		$	(2,716,642	)	$	11,588,457
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	—		$	(343	)	$	(3,017	)	$	(5,195	)	$	346,192		$	(94,407	)	$	243,230

The tables below provide roll-forward information by class of investments and derivatives measured using significant unobservable inputs.

Level 3 - Investments by Class:
	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
	Other Asset Backed Securities			Non-Agency RMBS			Total Investments			Other Asset Backed Securities			Non-Agency RMBS			Total Investments
Balance, beginning of period	$	72,540		$	736,017		$	808,557		$	65,990		$	696,713		$	762,703
Total gains/(losses) realized and unrealized:
Included in earnings	457			34,727			35,184			353			9,466			9,819
Included in other comprehensive income	(370		)	(52,138		)	(52,508		)	(279		)	6,564			6,285
Purchases	—			—			—			—			9,851			9,851
Issuances	—			—			—			—			—			—
Sales	—			—			—			—			(79,319		)	(79,319		)
Settlements	(306		)	(713,297		)	(713,603		)	(257		)	(9,536		)	(9,793		)
Transfers into Level 3	—			—			—			—			22,078			22,078
Transfers out of Level 3	—			—			—			—			—			—
Balance, end of period	$	72,321		$	5,309		$	77,630		$	65,807		$	655,817		$	721,624
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	—		$	—		$	—		$	—		$	—		$	—

Level 3 - Derivatives by Class:
	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
	Interest Rate Swaps			Credit Derivatives			Total Derivatives			Interest Rate Swaps			Credit Derivatives			Total Derivatives
Balance, beginning of period	$	61,374		$	(566	)	$	60,808		$	(84,933	)	$	(15,349	)	$	(100,282	)
Total gains/(losses) realized and unrealized:
Included in earnings	(9,029		)	(346		)	(9,375		)	(3,869		)	1,052			(2,817		)
Included in other comprehensive income	—			—			—			—			—			—
Purchases	—			—			—			—			—			—
Issuances	—			—			—			—			—			—
Sales	—			—			—			—			—			—
Settlements	(1,419		)	(106		)	(1,525		)	710			(199		)	511
Transfers into Level 3	—			—			—			—			—			—
Transfers out of Level 3	—			—			—			—			—			—
Balance, end of period	$	50,926		$	(1,018	)	$	49,908		$	(88,092	)	$	(14,496	)	$	(102,588	)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	(9,029	)	$	(452	)	$	(9,481	)	$	(3,869	)	$	852		$	(3,017	)

Invested assets and VIE long-term debt are transferred into Level 3 when internal valuation models that include significant unobservable inputs are used to estimate fair value. All such securities that have internally modeled fair values have been classified as Level 3. Non-agency RMBS securities transferred into Level 3 in 2017 consist of an Ambac-insured re-REMIC collateralized by distressed mortgage-backed securities.

Derivative instruments are transferred into Level 3 when the use of unobservable inputs becomes significant to the overall valuation. There were no transfers of derivative instruments into or out of Level 3 in the periods disclosed. There were no transfers between Level 1 and Level 2 for the periods presented. All transfers between fair value hierarchy Levels 1, 2, and 3 are recognized at the beginning of each accounting period.

Gains and losses (realized and unrealized) relating to Level 3 assets and liabilities included in earnings for the affected periods are reported as follows:

	Net Investment Income		Realized Gains or (Losses) and Other Settlements on Credit Derivative Contracts		Unrealized Gains or (Losses) on Credit Derivative Contracts			Derivative Products Revenues (Interest Rate Swaps)			Income (Loss) on Variable Interest Entities			Other Income or (Loss)
Three Months Ended March 31, 2018:
Total gains or losses included in earnings for the period	$	35,184	$	—	$	(452	)	$	(9,029	)	$	(111,629	)	$	(358	)
Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date	—		—		(452		)	(9,029		)	(111,629		)	(358		)
Three Months Ended March 31, 2017:
Total gains or losses included in earnings for the period	$	9,819	$	199	$	853		$	(3,869	)	$	246,590		$	(343	)
Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date	—		—		852			(3,869		)	246,590			(343		)

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Investments

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Investments

8. INVESTMENTS

Ambac’s non-VIE invested assets are primarily comprised of fixed income securities classified as available-for-sale and equity interests in pooled investment funds. Such equity interests in the form of common stock or in-substance common stock are classified as trading securities and are reported within Other investments on the Consolidated Balance Sheets. Other investments also include Ambac's debt (at December 31, 2017 only) and equity interests in an unconsolidated trust created in connection with its sale of Segregated Account junior surplus notes on August 28, 2014.

Fixed Income Securities:

The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at March 31, 2018 and December 31, 2017 were as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Non-credit Other-than temporary Impairments (1)
March 31, 2018:
Fixed income securities:
Municipal obligations	$	853,001	$	14,307	$	11,921	$	855,387	$	109
Corporate obligations (2)	1,445,586		12,216		18,809		1,438,993		—
Foreign obligations	26,425		238		268		26,395		—
U.S. government obligations	90,281		119		3,139		87,261		—
Residential mortgage-backed securities	726,998		101,218		4,920		823,296		4,854
Collateralized debt obligations	50,754		204		—		50,958		—
Other asset-backed securities	520,863		69,678		893		589,648		—
	3,713,908		197,980		39,950		3,871,938		4,963
Short-term	321,210		4		95		321,119		—
	4,035,118		197,984		40,045		4,193,057		4,963
Fixed income securities pledged as collateral:
U.S. government obligations	84,240		—		—		84,240		—
Total collateralized investments	84,240		—		—		84,240		—
Total available-for-sale investments	$	4,119,358	$	197,984	$	40,045	$	4,277,297	$	4,963
December 31, 2017:
Fixed income securities:
Municipal obligations	$	845,778	$	3,456	$	69,400	$	779,834	$	—
Corporate obligations	858,774		6,772		5,471		860,075		—
Foreign obligations	26,245		409		111		26,543		—
U.S. government obligations	86,900		261		1,753		85,408		—
Residential mortgage-backed securities	2,214,512		67,303		30,482		2,251,333		23,832
Collateralized debt obligations	50,754		283		—		51,037		—
Other asset-backed securities	531,660		66,899		617		597,942		—
	4,614,623		145,383		107,834		4,652,172		23,832
Short-term	557,476		3		209		557,270		—
	5,172,099		145,386		108,043		5,209,442		23,832
Fixed income securities pledged as collateral:
U.S. government obligations	99,719		—		—		99,719		—
Total collateralized investments	99,719		—		—		99,719		—
Total available-for-sale investments	$	5,271,818	$	145,386	$	108,043	$	5,309,161	$	23,832

(1) Represents the amount of non-credit other-than-temporary impairment losses remaining in accumulated other comprehensive income on securities that also had a credit impairment. These losses are included in gross unrealized losses as of March 31, 2018 and December 31, 2017.

(2) Includes Ambac's holdings of the secured notes issued by Ambac LSNI in connection with the Rehabilitation Exit Transactions.

The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at March 31, 2018, by contractual maturity, were as follows:

	Amortized Cost		Estimated Fair Value
Due in one year or less	$	461,954	$	461,683
Due after one year through five years	1,237,724		1,239,764
Due after five years through ten years	287,768		279,803
Due after ten years	833,297		832,145
	2,820,743		2,813,395
Residential mortgage-backed securities	726,998		823,296
Collateralized debt obligations	50,754		50,958
Other asset-backed securities	520,863		589,648
Total	$	4,119,358	$	4,277,297

Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay certain obligations with or without call or prepayment penalties.

Unrealized Losses on Fixed Income Securities:

The following table shows gross unrealized losses and fair values of Ambac’s available-for-sale investments, excluding VIE investments, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at March 31, 2018 and December 31, 2017:

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
March 31, 2018:
Fixed income securities:
Municipal obligations	$	495,224	$	10,775	$	30,590	$	1,146	$	525,814	$	11,921
Corporate obligations	457,056		13,566		106,696		5,243		563,752		18,809
Foreign obligations	13,806		217		1,736		51		15,542		268
U.S. government obligations	77,446		3,067		3,423		72		80,869		3,139
Residential mortgage-backed securities	13,321		531		101,462		4,389		114,783		4,920
Other asset-backed securities	34,288		123		77,184		770		111,472		893
	1,091,141		28,279		321,091		11,671		1,412,232		39,950
Short-term	120,661		95		—		—		120,661		95
Total temporarily impaired securities	$	1,211,802	$	28,374	$	321,091	$	11,671	$	1,532,893	$	40,045

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
December 31, 2017:
Fixed income securities:
Municipal obligations	$	667,335	$	68,578	$	32,525	$	822	$	699,860	$	69,400
Corporate obligations	292,028		3,377		87,272		2,094		379,300		5,471
Foreign obligations	8,122		81		1,700		30		9,822		111
U.S. government obligations	74,188		1,653		5,525		100		79,713		1,753
Residential mortgage-backed securities	668,524		12,524		418,617		17,958		1,087,141		30,482
Other asset-backed securities	26,655		58		88,023		559		114,678		617
	1,736,852		86,271		633,662		21,563		2,370,514		107,834
Short-term	251,926		209		—		—		251,926		209
Total temporarily impaired securities	$	1,988,778	$	86,480	$	633,662	$	21,563	$	2,622,440	$	108,043

Management has determined that the unrealized losses reflected in the tables above are temporary in nature as of March 31, 2018 and December 31, 2017 based upon (i) no unexpected principal and interest payment defaults on these securities; (ii) analysis of the creditworthiness of the issuer and financial guarantor, as applicable, and analysis of projected defaults on the underlying collateral; (iii) management has no intent to sell these investments in debt securities; and (iv) it is not more likely than not that Ambac will be required to sell these debt securities before the anticipated recovery of its amortized cost basis. The assessment under (iv) is based on a comparison of future available liquidity from the investment portfolio against the projected net cash outflow from operating activities and debt service. For purposes of this assessment, available liquidity from the investment portfolio is comprised of the fair value of securities for which management has asserted its intent to sell, the fair value of other securities that are available for sale and in an unrealized gain position, trading securities plus the scheduled maturities and interest payments from the remaining securities in the portfolio. To the extent that securities that management intends to sell are in an unrealized loss position, they would have already been considered other-than-temporarily impaired with the amortized cost written down to fair value. Because the above-described assessment indicates that future available liquidity exceeds projected net cash outflow, it is not more likely than not that we would be required to sell securities in an unrealized loss position before the recovery of their amortized cost basis. In the liquidity assessment described above, principal payments on securities pledged as collateral are not considered to be available for other liquidity needs until the collateralized positions are projected to be settled.

As of March 31, 2018, for securities that have indications of possible other-than-temporary impairment but which management does not intend to sell and will not more likely than not be required to sell, management compared the present value of cash flows expected to be collected to the amortized cost basis of the securities to assess whether the amortized cost will be recovered. Cash flows were discounted at the effective interest rate implicit in the security at the date of acquisition (or Fresh Start Reporting Date of April 30, 2013 for securities purchased prior to that date) or for debt securities that are beneficial interests in securitized financial assets, at a rate equal to the current yield used to accrete the beneficial interest. For floating rate securities, future cash flows and the discount rate used were both adjusted to reflect changes in the index rate applicable to each security as of the evaluation date. Of the securities that were in a gross unrealized loss position at March 31, 2018, $694,796 of the total fair value and $18,330 of the unrealized loss related to below investment grade and non-rated securities. Of the securities that were in a gross unrealized loss position at December 31, 2017, $1,855,694 of the total fair value and $100,503 of the unrealized loss related to below investment grade and non-rated securities. As discussed further below, most of the securities in a gross unrealized loss position that are below investment grade or non-rated are guaranteed by Ambac Assurance. Ambac’s assessment about whether a decline in value is other-than-temporary reflects management’s current judgment regarding facts and circumstances specific to a security and the factors noted above. If that judgment changes, Ambac may ultimately record a charge for other-than-temporary impairment in future periods.

Municipal obligations

The gross unrealized losses on municipal obligations as of March 31, 2018 are primarily the result of the price declines on Ambac-insured Puerto Rico bonds, especially Puerto Rico Sales Tax Financing Corporation's Senior Sales Tax Revenue bonds. These bonds are below investment grade, long-dated zero coupon securities subject to higher than average price volatility. These bonds suffered material downward price movement in late 2017 and subsequently recovered most of this lost value during the first quarter of 2018. Management has the ability and intent to hold these bonds and by virtue of the Ambac financial guarantee, believes that it is probable that all amounts due on the bonds will be paid timely and in full.

Corporate obligations

The gross unrealized losses on corporate obligations as of March 31, 2018 are primarily the result of the increase in interest rates since purchase (or the Fresh Start Reporting Date of April 30, 2013 if owned as of that date). These securities are primarily fixed-rate securities with an investment grade credit rating. Management believes that the timely receipt of all principal and interest on these positions is probable.

Realized Gains and Losses and Other-Than-Temporary Impairments:

The following table details amounts included in net realized gains (losses) and other-than-temporary impairments included in earnings for the affected periods:

	Three Months Ended March 31,
	2018			2017
Gross realized gains on securities	$	11,054		$	2,659
Gross realized losses on securities	(1,388		)	(9,471		)
Net foreign exchange (losses) gains	(4,804		)	1,916
Net realized gains (losses)	$	4,862		$	(4,896	)
Net other-than-temporary impairments (1)	$	(299	)	$	(3,942	)

(1) Other-than-temporary impairments exclude impairment amounts recorded in other comprehensive income under ASC Paragraph 320-10-65-1, which comprise non-credit related amounts on securities that are credit impaired but which management does not intend to sell and it is not more likely than not that Ambac will be required to sell before recovery of the amortized cost basis.

During the Segregated Account Rehabilitation Proceedings, changes in the estimated timing of claim payments resulted in adverse changes in projected cash flows on certain impaired Ambac insured securities. Such changes in estimated claim payments on Ambac insured securities contributed to net other-than-temporary impairments for the three months ended March 31, 2017, presented in the table above. Future changes in our estimated liquidity needs could result in a determination that Ambac no longer has the ability to hold securities that are in an unrealized loss position, which could also result in additional other-than-temporary impairment charges.

The following table presents a roll-forward of Ambac’s cumulative credit losses on debt securities held as of March 31, 2018 and 2017 for which a portion of an other-than-temporary impairment was recognized in other comprehensive income:

	Three Months Ended March 31,
	2018			2017
Balance, beginning of period	$	67,085		$	52,070
Additions for credit impairments recognized on:
Securities not previously impaired	226			307
Securities previously impaired	64			1,985
Reductions for credit impairments previously recognized on:
Securities that matured or were sold during the period	(23,742		)	—
Balance, end of period	$	43,633		$	54,362

Counterparty Collateral, Deposits with Regulators and Other Restrictions:

Ambac routinely pledges and receives collateral related to certain transactions. Cash and securities held directly in Ambac’s investment portfolio with a fair value of $107,060 and $120,645 at March 31, 2018 and December 31, 2017, respectively, were pledged to derivative counterparties. Ambac’s derivative counterparties have the right to re-pledge the investment securities and as such, these pledged securities are separately classified on the Consolidated Balance Sheets as “Fixed income securities pledged as collateral, at fair value”. There was no cash or securities received from other counterparties that were re-pledged by Ambac.

Securities carried at $5,926 and $5,974 at March 31, 2018 and December 31, 2017, respectively, were deposited by Ambac Assurance and Everspan with governmental authorities or designated custodian banks as required by laws affecting insurance companies.

Securities with fair value of $256,553 and $346,212 at March 31, 2018 and December 31, 2017, respectively, were held by a bankruptcy remote trust to collateralize and fund repayment of debt issued through a re-securitization transaction. The securities may not be sold or repledged by the trust. These assets are held and the secured debt is issued by entities that qualify as VIEs and are consolidated in Ambac’s unaudited consolidated financial statements. Refer to Note 3. Special Purpose Entities, Including Variable Interest Entities for a further description of this transaction.

As further discussed in Note 1. Background and Business Description, Ambac LSNI, an unconsolidated special purpose entity, issued Secured Notes in connection with the Rehabilitation Exit Transactions of February 12, 2018. Securities with a fair value of $367,816 at March 31, 2018 were pledged as collateral and as sources of funding to repay the Secured Notes. The securities may not be sold or repledged by Ambac LSNI. Ambac LSNI qualifies as a VIE that is not consolidated in Ambac's unaudited consolidated financial statements.

Guaranteed Securities:

Ambac’s fixed income portfolio includes securities covered by guarantees issued by Ambac Assurance and other financial guarantors (“insured securities”). The published rating agency ratings on these securities reflect the higher of the financial strength rating of the financial guarantor or the rating of the underlying issuer. Rating agencies do not always publish separate underlying ratings (those ratings excluding the insurance by the financial guarantor). In the event these underlying ratings are not available from the rating agencies, Ambac will assign an internal rating. The following table represents the fair value, including the value of the financial guarantee, and weighted-average underlying rating, excluding the financial guarantee, of the insured securities at March 31, 2018 and December 31, 2017, respectively: 

	Municipal Obligations		Corporate Obligations (3)		Mortgage and Asset- backed Securities		Total		Weighted Average Underlying Rating (1)
March 31, 2018:
Ambac Assurance Corporation (2)	$	785,791	$	813,720	$	1,283,502	$	2,883,013	CC
National Public Finance Guarantee Corporation	18,913		—		—		18,913		BBB-
Assured Guaranty Municipal Corporation	6,000		—		—		6,000		BBB+
Total	$	810,704	$	813,720	$	1,283,502	$	2,907,926	CC
December 31, 2017:
Ambac Assurance Corporation (2)	$	706,715	$	32,660	$	2,702,887	$	3,442,262	CC
National Public Finance Guarantee Corporation	20,733		—		—		20,733		BBB-
Assured Guaranty Municipal Corporation	5,998		—		—		5,998		BBB+
Total	$	733,446	$	32,660	$	2,702,887	$	3,468,993	CC

(1) Ratings are based on the lower of Standard & Poor’s or Moody’s rating. If unavailable, Ambac’s internal rating is used.

(2) Includes corporate obligations and asset-backed securities with a fair value of $169,943 and $170,280 at March 31, 2018 and December 31, 2017, respectively, insured by Ambac UK.

(3) 2018 includes Ambac's holdings of the secured notes issued by Ambac LSNI in connection with the Rehabilitation Exit Transactions. These secured notes are insured by Ambac Assurance.

Equity Interests:

Ambac's investment portfolio includes equity interests in various pooled investment funds, which are classified as trading. The fair value and additional information about such investments in pooled funds, by investment type, is summarized in the table below. Except as noted in the table, fair value reported is determined using NAV per share as a practical expedient. There are no unfunded commitments applicable to any of these investments for the periods disclosed.

	Fair Value
Class of Funds	March 31, 2018		December 31, 2017		Redemption Frequency	Redemption Notice Period
Real estate properties (1)	$	34,752	$	33,154	quarterly	10 business days
Diversified hedge fund strategies (2)	56,394		53,054		semi-monthly	15 - 30 days
Interest rate products (3) (7)	142,856		136,603		daily, weekly or monthly	0 - 30 days
Illiquid investments (4)	71,366		67,787		quarterly	180 days
Insurance-linked investments (5)	23,637		22,666		quarterly	90-120 days
Equity market investments (6) (7)	54,682		53,675		daily	0 days
Total equity investments in pooled funds	$	383,687	$	366,939

(1) Investments consist of UK property to generate income and capital growth.

(2) Investments seek diversified exposure to hedge fund core strategies to produce high risk-adjusted returns, with low long-term correlation to traditional markets and with targeted volatility levels. Funds may have the right to defer redemptions under certain circumstances.

(3) This class of funds includes investments in a range of instruments including leveraged loans, CLOs, asset-backed securities and floating rate notes to generate income and capital appreciation. Funds with less frequent redemption periods limit redemptions to as little as 15% per period. Funds with a same day redemption notice period are redeemable only weekly, while funds that may be redeemed any business day have notice periods of 15-30 days.

(4) This class seeks to obtain high long-term total return through investments with low liquidity and defined term, resulting in expected capital distributions to subscribers between 2020 and 2023. Redemptions cannot occur prior to the expiration of the investment lock-up period in May 2018.

(5) This class aims to provide returns from the insurance and reinsurance markets through investments in catastrophe bonds, life insurance and other insurance linked investments. Redemption periods are quarterly, subject to 90-day notice for January/July redemption dates and 120-day notice for April/October redemption dates with redemptions greater than 3.5% during the first five years following share issuance subject to redemption fees.

(6) Investments represent a diversified exposure to global equity market returns through holdings of various regional market index funds.

(7) Interest rate products include $2,853 at March 31, 2018 and $2,823 at December 31, 2017 and equity market investments include $54,682 at March 31, 2018 and $53,675 at December 31, 2017 that have readily determinable fair values priced through pricing vendors.

Ambac also holds interests in an unconsolidated trust created in connection with the 2014 sale of Segregated Account junior surplus notes. The investment in debt securities is accounted for as trading and the equity interest is accounted for under the equity method.

Investment Income:

Net investment income was comprised of the following for the affected periods:

	Three Months Ended March 31,
	2018			2017
Fixed income securities	$	109,351		$	74,069
Short-term investments	2,840			989
Loans	187			89
Investment expense	(1,827		)	(1,997		)
Securities available-for-sale and short-term	110,551			73,150
Other investments	(311		)	8,409
Total net investment income	$	110,240		$	81,559

Net investment income from Other investments primarily represents changes in fair value on securities classified as trading or under the fair value option plus income from Ambac's interests in an unconsolidated trust created in connection with its sale of Segregated Account junior surplus notes. The portion of net unrealized gains (losses) related to trading securities still held at the end of each period is as follows:

	Three Months Ended March 31,
	2018			2017
Net gains (losses) recognized during the period on trading securities	$	(1,579	)	$	7,211
Less: net gains (losses) recognized during the reporting period on trading securities sold during the period	1,933			1,283
Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date	$	(3,512	)	$	5,928

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Derivative Instruments

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

9. DERIVATIVE INSTRUMENTS

The following tables summarize the gross fair values of individual derivative instruments and the impact of legal rights of offset as reported in the Consolidated Balance Sheets as of March 31, 2018 and December 31, 2017:

	Gross Amounts of Recognized Assets / Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet		Gross Amount of Collateral Received / Pledged Not Offset in the Consolidated Balance Sheet		Net Amount
March 31, 2018:
Derivative Assets:
Interest rate swaps	$	60,198	$	2	$	60,196	$	—	$	60,196
Total non-VIE derivative assets	$	60,198	$	2	$	60,196	$	—	$	60,196
Derivative Liabilities:
Credit derivatives	$	1,018	$	—	$	1,018	$	—	$	1,018
Interest rate swaps	70,568		2		70,566		69,545		1,021
Total non-VIE derivative liabilities	$	71,586	$	2	$	71,584	$	69,545	$	2,039
Variable Interest Entities Derivative Assets:
Currency swaps	$	46,260	$	—	$	46,260	$	—	$	46,260
Total VIE derivative assets	$	46,260	$	—	$	46,260	$	—	$	46,260
Variable Interest Entities Derivative Liabilities:
Interest rate swaps	$	2,155,456	$	—	$	2,155,456	$	—	$	2,155,456
Total VIE derivative liabilities	$	2,155,456	$	—	$	2,155,456	$	—	$	2,155,456
December 31, 2017:
Derivative Assets:
Interest rate swaps	$	73,826	$	627	$	73,199	$	—	$	73,199
Total non-VIE derivative assets	$	73,826	$	627	$	73,199	$	—	$	73,199
Derivative Liabilities:
Credit derivatives	$	566	$	—	$	566	$	—	$	566
Interest rate swaps	81,495		627		80,868		79,912		956
Futures contracts	1,348		—		1,348		1,348		—
Total non-VIE derivative liabilities	$	83,409	$	627	$	82,782	$	81,260	$	1,522
Variable Interest Entities Derivative Assets:
Currency swaps	$	54,877	$	—	$	54,877	$	—	$	54,877
Total VIE derivative assets	$	54,877	$	—	$	54,877	$	—	$	54,877
Variable Interest Entities Derivative Liabilities:
Interest rate swaps	$	2,205,264	$	—	$	2,205,264	$	—	$	2,205,264
Total VIE derivative liabilities	$	2,205,264	$	—	$	2,205,264	$	—	$	2,205,264

Amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivative instruments on the Consolidated Balance Sheets. The amounts representing the right to reclaim cash collateral and posted margin, recorded in “Other assets” were $22,820 and $20,926 as of March 31, 2018 and December 31, 2017, respectively. There were no amounts held representing an obligation to return cash collateral as of March 31, 2018 and December 31, 2017.

The following tables summarize the location and amount of gains and losses of derivative contracts in the Consolidated Statements of Total Comprehensive Income (Loss) for the three months endedMarch 31, 2018 and 2017:

	Location of Gain or (Loss) Recognized in Consolidated Statements of Total Comprehensive Income (Loss)	Amount of Gain or (Loss)  Recognized in Consolidated Statement of Total  Comprehensive Income (Loss)
		Three Months Ended March 31,
		2018			2017
Non-VIEs:
Credit derivatives	Net change in fair value of credit derivatives	$	(346	)	$	1,052
Non-VIE derivatives:
Interest rate swaps	Net gains (losses) on interest rate derivatives	4,543			108
Futures contracts	Net gains (losses) on interest rate derivatives	20,994			(1,622		)
Total Non-VIE derivatives		25,537			(1,514		)
Variable Interest Entities:
Currency swaps	Income (loss) on variable interest entities	(8,617		)	(4,948		)
Interest rate swaps	Income (loss) on variable interest entities	49,809			14,496
Total Variable Interest Entities		41,192			9,548
Total derivative contracts		$	66,383		$	9,086

Credit Derivatives:

Credit derivatives, which are privately negotiated contracts, provide the counterparty with credit protection against the occurrence of a specific event such as a payment default or bankruptcy relating to an underlying obligation. Upon a credit event, Ambac is required to make payments equal to the difference between the scheduled debt service payment and the actual payment made by the issuer. Credit derivatives issued are insured by Ambac Assurance. None of the outstanding credit derivative transactions at March 31, 2018 include ratings based collateral-posting triggers or otherwise require Ambac to post collateral regardless of Ambac’s ratings or the size of the mark to market exposure to Ambac.

The portfolio of our credit derivatives were written on a “pay-as-you-go” basis. Similar to an insurance policy execution, pay-as-you-go provides that Ambac pays interest shortfalls on the referenced transaction as they are incurred on each scheduled payment date, but only pays principal shortfalls upon the earlier of (i) the date on which the assets designated to fund the referenced obligation have been disposed of and (ii) the legal final maturity date of the referenced obligation.

Ambac maintains internal credit ratings on its guaranteed obligations, including credit derivative contracts, solely to indicate management’s view of the underlying credit quality of the guaranteed obligations. Independent rating agencies may have assigned different ratings on the credits in Ambac’s portfolio than Ambac’s internal ratings. The following table summarizes the gross principal notional outstanding for CDS contracts, by Ambac rating as of March 31, 2018 and December 31, 2017:

Ambac Rating	March 31, 2018		December 31, 2017
AAA	$	—	$	—
AA	176,631		175,765
A	—		—
BBB (1)	154,025		150,125
Below investment grade (2)	—		—
Total	$	330,656	$	325,890

(1) BBB internal ratings reflect bonds which are of medium grade credit quality with adequate capacity to pay interest and repay principal. Certain protective elements and margins may weaken under adverse economic conditions and changing circumstances. These bonds are more likely than higher rated bonds to exhibit unreliable protection levels over all cycles.

(2) Below investment grade internal ratings reflect bonds which are of speculative grade credit quality with the adequacy of future margin levels for payment of interest and repayment of principal potentially adversely affected by major ongoing uncertainties or exposure to adverse conditions.

Interest Rate Derivatives:

Ambac, through its subsidiary Ambac Financial Services (“AFS”), provided interest rate swaps to states, municipalities and their authorities, asset-backed issuers and other entities in connection with their financings. Additionally, AFS uses interest rate derivatives as an economic hedge against the effects of rising interest rates elsewhere in the Company, including on Ambac’s financial guarantee exposures. As of March 31, 2018 and December 31, 2017 the notional amounts of AFS’s derivatives are as follows:

	Notional
Type of derivative	March 31, 2018		December 31, 2017
Interest rate swaps—receive-fixed/pay-variable	$	376,414	$	379,497
Interest rate swaps—pay-fixed/receive-variable	1,439,932		1,428,264
US Treasury futures contracts—short	1,805,000		1,655,000

Derivatives of Consolidated Variable Interest Entities

Certain VIEs consolidated under the Consolidation Topic of the ASC entered into derivative contracts to meet specified purposes within the securitization structure. The notional for VIE derivatives outstanding as of March 31, 2018 and December 31, 2017 are as follows:

	Notional
Type of VIE derivative	March 31, 2018		December 31, 2017
Interest rate swaps—receive-fixed/pay-variable	$	1,540,122	$	1,483,491
Interest rate swaps—pay-fixed/receive-variable	2,561,654		2,479,244
Currency swaps	402,231		394,541
Credit derivatives	11,865		12,100

Contingent Features in Derivatives Related to Ambac Credit Risk

Ambac’s over-the-counter interest rate swaps are centrally cleared when eligible. Certain interest rate swaps remain with professional swap-dealer counterparties and certain front-end counterparties. These non-cleared swaps are generally executed under standardized derivative documents including collateral support and master netting agreements. Under these agreements, Ambac is required to post collateral in the event net unrealized losses exceed predetermined threshold levels. Additionally, given that Ambac Assurance is no longer rated by an independent rating agency, counterparties have the right to terminate the swap positions.

As of March 31, 2018 and December 31, 2017, the net liability fair value of derivative instruments with contingent features linked to Ambac’s own credit risk was $69,545 and $79,912, respectively, related to which Ambac had posted cash and securities as collateral with a fair value of $98,280 and $111,391, respectively. All such ratings-based contingent features have been triggered as requiring maximum collateral levels to be posted by Ambac while preserving counterparties’ rights to terminate the contracts. Assuming all such contracts terminated on March 31, 2018, settlement of collateral balances and net derivative liabilities would result in a net receipt of cash and/or securities by Ambac. If counterparties elect to exercise their right to terminate, the actual termination payment amounts will be determined in accordance with derivative contract terms, which may result in amounts that differ from market values as reported in Ambac’s financial statements.

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Income Taxes

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

11. INCOME TAXES

Ambac files a consolidated Federal income tax return with its subsidiaries. Ambac and its subsidiaries also file separate or combined income tax returns in various states, local and foreign jurisdictions. The following are the major jurisdictions in which Ambac and its subsidiaries operate and the earliest tax years subject to examination:

Jurisdiction	Tax Year
United States	2010
New York State	2013
New York City	2013
United Kingdom	2014
Italy	2013

As of March 31, 2018 Ambac had U.S. federal ordinary net loss carryforwards totaling approximately $3,279,491, which, if not utilized, will begin expiring in 2029, and will fully expire in 2032.

The tax effects of temporary differences that give rise to significant portions of the deferred tax liabilities and deferred tax assets at March 31, 2018 and December 31, 2017 are presented below:

	March 31, 2018			December 31, 2017
Deferred tax liabilities:
Insurance intangible	$	174,938		$	177,864
Debentures	53,274			28,387
Unearned premiums and credit fees	50,569			51,485
Variable interest entities	23,221			22,817
Investments	19,003			28,798
Other	11,722			9,402
Total deferred tax liabilities	332,727			318,753
Deferred tax assets:
Net operating loss and capital carryforward	688,693			775,917
Loss reserves	298,888			264,624
Compensation	6,819			5,585
Other	1,819			2,140
Subtotal deferred tax assets	996,219			1,048,266
Valuation allowance	698,296			763,172
Total deferred tax assets	297,923			285,094
Net deferred tax (liability)	$	(34,804	)	$	(33,659	)

In accordance with the Income Tax Topic of the ASC, a valuation allowance is recognized if, based on the weight of available evidence, it is more-likely-than-not that some, or all, of the deferred tax asset will not be realized. As a result of the risks and uncertainties associated with future operating results, management believes it is more likely than not that the Company will not generate sufficient U.S. federal taxable income to recover the deferred tax operating asset and therefore has a full valuation allowance.

In accordance with SEC issued guidance (SAB 118), which provides a one-year measurement period for companies to finalize the accounting for the impact of the TCJA, Ambac continues to record the income tax effect of provisions related to international and executive compensation as estimates.

U.S. and foreign components of pre-tax income were as follows:

	Three Months Ended March 31,
	2018		2017
U.S.	$	297,741	$	(191,872	)
Foreign	10,568		86,012
Total	$	308,309	$	(105,860	)

The components of the provision for income taxes were as follows:

	Three Months Ended March 31,
	2018			2017
Current taxes
U. S. federal	$	—		$	—
U.S. state and local	1,037			320
Foreign	(39		)	19,261
Current taxes	998			19,581
Deferred taxes
Foreign	1,607			—
Provision for income taxes	$	2,605		$	19,581

NOL Usage

Pursuant to the intercompany tax sharing agreement, to the extent Ambac Assurance generates taxable income after September 30, 2011, which is offset with "Allocated NOLs" of $3,650,000, it is obligated to make payments (“Tolling Payments”), subject to certain credits, to Ambac in accordance with the following NOL usage table, where the “Applicable Percentage” is applied to the aggregate amount of federal income tax liability that would have been paid if the Allocated NOLs were not available. Pursuant to the Closing Agreement between Ambac and the Internal Revenue Service ("IRS"), the IRS will receive 12.5% of Tier C and 17.5% of Tier D payments, if made.

NOL Usage Table

NOL Usage Tier	Allocated NOLs			Applicable Percentage
A	The first	$479,000		15%
B	The next	$1,057,000	after Tier A	40%
C	The next	$1,057,000	after Tier B	10%
D	The next	$1,057,000	after Tier C	15%

For the three months ended March 31, 2018, Ambac Assurance generated $406,232 of taxable income, utilizing the remaining $168,205 balance of the $1,057,000 allocated Tier B NOL, and resulting in additional accrued Tolling Payments, net of applicable credits, of $14,129, which, assuming Ambac Assurance's cumulative full year 2018 taxable income does not fall below $168,205, will be paid to Ambac before the end of May of 2019. In addition, Ambac Assurance utilized $238,026 of Tier C NOL, which was applied against the $5,000 Tier C credit. Ambac Assurance will need to generate additional taxable income of $69 to offset the remaining balance of the $5,000 Tier C credit, at which point additional cumulative income will begin to accrue additional tolling payments to Ambac until all the of $3,650,000 Allocated Ambac Assurance NOLs have been utilized, expire, or otherwise become unavailable.

Beginning on the fifth anniversary date subsequent to Ambac's May 1, 2013 emergence from bankruptcy, and subject to Ambac's consent, not to be unreasonably withheld, to the extent Ambac Assurance generates post-determination date income in excess of the $3,650,000 Allocated NOLs, Ambac Assurance may utilize Ambac's then remaining NOLs in exchange for a payment of 25% of the federal income tax liability that Ambac Assurance would have paid had Ambac's NOLs not been available. After Ambac fully utilizes its Allocated NOLs it may utilize Ambac Assurance's then remaining Allocated NOLs in exchange for a payment of 50% of the federal income tax liability that Ambac would have paid had Ambac Assurance's NOL not been available.

As of March 31, 2018, the remaining balance of the $3,279,491 NOL allocated to Ambac Assurance was $1,875,973. As of March 31, 2018 Ambac's NOL was $1,403,518.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

12. COMMITMENTS AND CONTINGENCIES

The following commitments and contingencies provide an update of those discussed in Note 18: Commitments and Contingencies in the Notes to Consolidated Financial Statements included Part II, Item 8 in the Company’s Annual Report on Form 10-K for the year ended December 2017, and should be read in conjunction with the complete descriptions provided in the aforementioned Form 10-K.

The Segregated Account and Wisconsin Rehabilitation Proceeding

On September 25, 2017, the Rehabilitator filed in the Rehabilitation Court a Motion to Further Amend The Plan of Rehabilitation Confirmed on January 24, 2011 To Facilitate An Exit from Rehabilitation. The evidentiary Confirmation Hearing was held on January 4, 2018, and continued on January 22, 2017. On January 22, 2018, the Rehabilitation Court entered an order (the "Confirmation Order") granting the Rehabilitator’s motion and confirming the Second Amended Plan of Rehabilitation, which became effective on February 12, 2018. Pursuant to the Confirmation Order, the Rehabilitation Court also ruled that, contrary to allegations made by certain parties to certain military housing litigations (the "MHPI Projects"), the Rehabilitation Court did not previously enter any order that could form the predicate for a claim of “Ambac Default” and confirmed Section 6.13 of the Second Amended Plan of Rehabilitation which, among other things, provided that any such default is deemed not to have existed or to be cured.

On January 25, 2018, the MHPI Projects submitted a letter to the Rehabilitation Court objecting to the Rehabilitator's interpretation of the injunction in Article 6.8 of the Second Amended Plan of Rehabilitation and requesting briefing on the issue and a conference with the Rehabilitation Court. On February 7, 2018, pursuant to the request of the Rehabilitator, the Rehabilitation Court issued an order denying the request for briefing and a conference and overruled the objection set forth in the letter of January 25th. On February 7, 2018, the Rehabilitator filed a motion with the Rehabilitation Court requesting injunctive relief against the MHPI Projects that would, among other things, enjoin the MHPI Projects from taking further actions or making further arguments, in any court or otherwise, in contravention of the Confirmation Order, the findings contained in the Confirmation Order or the provisions of the Second Amended Plan of Rehabilitation. On the same day, the Rehabilitation Court issued an order granting the Rehabilitator's February 7th motion (the "February 7 Order"). On February 26, 2018, the MHPI Projects filed a Notice of Motion and Motion for Reconsideration as well as a Notice of Motion and Motion for Expedited Hearing in the Rehabilitation Court, requesting reconsideration of the February 7th Order on an expedited basis. Briefing on the motions was completed on April 5, 2018, and a hearing has been scheduled for May 10, 2018. On May 4, 2018, the Rehabilitator filed in the Rehabilitation Court a Motion to Dissolve the Injunction dated February 7, 2018 and Amend Confirmation Order and a Motion for Final Decree and Order Discharging the Rehabilitator. In the former motion, the Rehabilitator requested the Rehabilitation Court to dissolve the injunction put in place under the February 7 Order and to amend the Confirmation Order, and thereby amend Section 6.13 of the Second Amended Plan of Rehabilitation, to limit the application of Section 6.13 to defaults or alleged defaults related to policies formerly allocated to the Segregated Account. The Rehabilitator also requested in the May 4, 2018 filings that the Rehabilitation Court remove the May 10, 2018 hearing from its calendar and enter a final decree and order closing the case and discharging the Rehabilitator and the Special Deputy Commissioner. On May 9, 2018, Ambac Assurance submitted a letter to the Rehabilitation Court to withdraw its brief in objection to the MHPI Projects’ Motion for Reconsideration of the February 7 Order and to request a briefing schedule with respect to the motions filed by OCI on May 4, 2018.

On March 2, 2018, the MHPI Projects noticed their appeal from the Confirmation Order and both of the orders issued by the Rehabilitation Court on February 7, 2018. On March 6, 2018, the MHPI Projects filed in the Rehabilitation Court a Notice of Motion and Motion for Stay Pending Appeal. On March 9, 2018, the MHPI Projects filed in the Wisconsin Court of Appeals a Motion for Ex Parte Relief Pending Appeal and Relief Pending Appeal. After accelerated briefing, the Court of Appeals granted the MHPI Projects’ Motion for Relief Pending Appeal on March 13, 2018 and stayed enforcement of the Rehabilitation Court’s February 7th Order and enforcement of Articles 6.8 and 6.13 of the Second Amended Plan of Rehabilitation, including but not limited to the extent that those Articles affect arguments that the MHPI Projects may make in any court. The Court of Appeals has not yet received the record of the proceedings before the Rehabilitation Court, and there is not yet a briefing schedule in the Court of Appeals relating to the MHPI Projects’ appeal.

Litigation Against Ambac

Ambac Assurance is defending several lawsuits in which borrowers have brought declaratory judgment actions claiming, among other things, that Ambac Assurance’s claims for specific performance related to the construction and development of housing at various military bases to replace or cash-fund a debt-service-reserve surety bond, as required under the applicable loan documents (see Litigation Filed By Ambac), are time-barred or are barred by the doctrine of laches, that Ambac lacks standing on the basis that there has been an “Ambac Default,” and that Ambac is not entitled to specific performance pursuant to the terms of the loan documents. Ambac Assurance is a defendant in various lawsuits, including the following:

• Meade Communities LLC v. Ambac Assurance Corporation (Circuit Court, Anne Arundel County, Maryland, Case No. C-02-CV-15-003745). On January 22, 2018, the court granted Meade's motion for summary judgment finding that Ambac Assurance lacked standing on the basis that there had been an "Ambac Default" by virtue of certain orders of the Rehabilitation Court. On January 26, 2018, Ambac Assurance filed a Motion to Alter or Amend Judgment with the Maryland Court arguing that the Rehabilitation Court's January 22 Confirmation Order constituted grounds for altering the judgment to award summary judgment on the "Ambac Default" issue for Ambac Assurance. On February 7, 2018, the Rehabilitation Court entered a further order enjoining Meade from continuing to argue that an Ambac Default occurred by virtue of the Rehabilitation Court's prior orders and requiring Meade to file that order with the Maryland Court. On February 8, 2018, Meade complied and filed the January 22nd and February 7th Rehabilitation Court orders with the Maryland court. On February 12, 2018, the Maryland Court granted Ambac Assurance's motion to stay enforcement of the Court's January 22nd amended order concerning "Ambac Default" and granting Meade an extension until March 14, 2018 to oppose Ambac Assurance's Motion to Alter or Amend Judgment. On March 14, 2018, Meade filed its opposition brief. The motion has not yet been decided.

• Monterey Bay Military Housing, LLC, et al. v. Ambac Assurance Corporation, et al. (United States District Court, Northern District of California, San Jose Division, Case No. 17-cv-04992-BLF, filed August 28, 2017). Plaintiffs filed an amended complaint on October 27, 2017. Ambac Assurance and the other defendants filed motions to dismiss the amended complaint on November 13, 2017, which Plaintiffs opposed on December 15, 2017. The motions are fully briefed and the court heard oral argument on April 12, 2018. No decision has been issued.

It is not reasonably possible to predict whether additional suits will be filed or whether additional inquiries or requests for information will be made, and it is also not possible to predict the outcome of litigation, inquiries or requests for information. It is possible that there could be unfavorable outcomes in these or other proceedings. Legal accruals for litigation against Ambac which are probable and reasonably estimable, and management's estimated range of loss for such matters, are not material to the operating results or financial position of the Company. For the litigation matters Ambac is defending that do not meet the “probable and reasonably estimable” accrual threshold and where no loss estimates have been provided above, management is unable to make a meaningful estimate of the amount or range of loss that could result from unfavorable outcomes. Under some circumstances, adverse results in any such proceedings could be material to our business, operations, financial position, profitability or cash flows. The Company believes that it has substantial defenses to the claims above and, to the extent that these actions proceed, the Company intends to defend itself vigorously; however, the Company is not able to predict the outcomes of these actions.

Litigation Filed or Joined by Ambac

In the ordinary course of their businesses, certain of Ambac’s subsidiaries assert claims in legal proceedings against third parties to recover losses already paid and/or mitigate future losses. The amounts recovered and/or losses avoided which may result from these proceedings is uncertain, although recoveries and/or losses avoided in any one or more of these proceedings during any quarter or fiscal year could be material to Ambac’s results of operations in that quarter or fiscal year.

Nat’l Collegiate Master Student Loan Trust v. Pa. Higher Education Assistance Agency (PHEAA) (Delaware Court of Chancery, C.A. No. 12111-VCS, filed March 21, 2016).   On January 12, 2018, Plaintiffs filed a motion for injunctive or declaratory relief requiring WTC, as Owner Trustee, and GSS Data Services, Inc., as Administrator, to resume processing for payment bills submitted by lawyers purporting to act on the Trusts’ behalf.  Oppositions to Plaintiffs’ motion were filed by Ambac and others on March 1, 2018.  Plaintiffs filed a reply brief in further support of their motion on March 16, 2018. At a hearing on April 3, 2018, the court denied Plaintiffs’ motion without prejudice. The court later entered an order memorializing its oral ruling on April 16, 2018. The court also granted Ambac’s motion to intervene on April 10, 2018 and Ambac filed its complaint in intervention on April 16, 2018.

Ambac Assurance Corporation v. Puerto Rico, et al. (United States District Court, District of Puerto Rico, No. 1:17-ap-00159, filed June 8, 2017). On July 28, 2017, Defendants moved to dismiss Ambac Assurance’s complaint; briefing on the motion to dismiss concluded on October 31, 2017, and oral argument on the motion was held on November 21, 2017. On February 27, 2018, the court granted Defendants’ motion to dismiss. As to certain of the claims, the court found that it lacks subject matter jurisdiction (i) to the extent the claims seek to invalidate the certification of the FEGP and prohibit certain actions under PROMESA due to alleged non-compliance with PROMESA requirements that are predicates to certification of the FEGP, or (ii) to the extent Ambac Assurance sought a determination of its lien rights over the PRHTA reserve accounts. As to other claims, the court found that Ambac Assurance had failed to state a claim upon which the court could grant relief, including that (i) as to constitutional issues, Ambac Assurance had failed to plead facts sufficient to allow the court to draw a reasonable inference that the Moratorium Legislation, Moratorium Orders, and Fiscal Plan Compliance Act were “unreasonable or unnecessary to effectuate an important government purpose” and had failed to allege plausibly that the FEGP is an exercise of Commonwealth legislative power, (ii) Ambac Assurance had failed to plead facts sufficient to show that the Moratorium Legislation and Moratorium Orders prohibited the payment of principal and interest or purported to bind creditors to any reduction of the outstanding obligations and therefore would have been preempted by PROMESA under PROMESA Section 303(1), and Ambac Assurance failed to plead plausible, ripe claims that the Moratorium Orders are unlawful under PROMESA section 303(3), (iii) the automatic stay is currently in effect and renders unavailable any cause of action pursuant to Section 407 of PROMESA, including claims by PRHTA bondholders that PRHTA should be compensated for any pledged special revenues transferred away from it in violation of applicable law, (iv) the court is not required or empowered under PROMESA or the Bankruptcy Code to order the payment of pledged special revenues to the PRHTA bondholders, and (v) Ambac Assurance had failed to plead facts sufficient to show that the PRHTA reserve accounts are the property of the bondholders. Finally, the court held that PROMESA section 305 prevented it from ordering any relief on Ambac’s claim that the PRHTA reserve accounts are held in trust for bondholders. On March 9, 2018, Ambac Assurance filed a notice of appeal to the First Circuit.

Official Committee of Unsecured Creditors v. Whyte (United States District Court, District of Puerto Rico, No. 1:17-ap-00257, filed September 8, 2017). Motions for summary judgment were filed on February 21, 2018; a hearing on the summary judgment motions was held on April 10, 2018. On February 26, 2018, the COFINA Agent moved to certify questions of law to the Supreme Court of Puerto Rico regarding COFINA’s constitutionality under the Puerto Rico Constitution. On April 3, 2018, Ambac Assurance filed an opposition to the motion to certify and, in the alternative, a cross-motion to certify alternative questions to the Supreme Court of Puerto Rico. Briefing on the motion to certify concluded on April 18, 2018; a hearing on the motion to certify is scheduled for May 9, 2018.

Ambac Assurance has filed various lawsuits seeking specific performance of obligations of borrowers on loans related to the construction and development of housing at various military bases to replace or cash-fund a debt-service-reserve surety bond provided by Ambac Assurance, as required under the applicable loan documents. Ambac Assurance has filed various lawsuits, including the following:

• Ambac Assurance Corporation v. Fort Bliss/White Sands Missile Range Housing LP (District Court, El Paso County, Texas, Cause No. 2016DCV0094). On February 7, 2018, the Rehabilitation Court entered a further order enjoining Bliss (among others) from continuing to argue that an Ambac Default occurred by virtue of the Rehabilitation Court's prior orders and requiring Bliss to file that order with the Texas Court. On February 8, 2018, Bliss filed the Rehabilitation Court's January 22 and February 7 orders with the Texas court. On March 13, 2018, the Wisconsin Court of Appeals entered an order that, among other things, stayed the Rehabilitation Court's February 7, 2018 injunction. On April 27, 2018, the court held argument on the cross-motions for summary judgment and took the matter under advisement, with no ruling issued from the bench.

In connection with Ambac Assurance’s efforts to seek redress for breaches of representations and warranties and fraud related to the information provided by both the underwriters and the sponsors of various residential mortgage-backed securities transactions and for failure to comply with the obligation by the sponsors to repurchase ineligible loans, Ambac Assurance has filed various lawsuits, including the following:

• Ambac Assurance Corporation and The Segregated Account of Ambac Assurance Corporation v. Countrywide Securities Corp., Countrywide Financial Corp. (a.k.a. Bank of America Home Loans) and Bank of America Corp. (Supreme Court of the State of New York, County of New York, Case No. 651612/2010, filed on September 28, 2010). On May 1, 2015, Ambac Assurance filed motions for partial summary judgment, which defendants opposed. Defendants also each filed motions for summary judgment, which Ambac Assurance opposed. On October 27, 2015, the court issued a decision dated October 22, 2015 granting in part and denying in part the parties’ respective summary judgment motions regarding Ambac Assurance’s claims against Countrywide (primary-liability claims), and issued a second decision granting Ambac Assurance’s partial motion for summary judgment and denying Bank of America’s motion for summary judgment regarding Ambac Assurance’s secondary-liability claims against Bank of America. Ambac Assurance and Countrywide filed notices of appeal of the October 22, 2015 decision relating to primary liability and Bank of America filed a notice of appeal of the October 27, 2015 decision relating to its secondary-liability to the New York Appellate Division, First Department. On May 16, 2017, the First Department issued rulings in both appeals, reversing a number of rulings that the trial court had made and affirming other rulings. On June 15, 2017, Ambac Assurance filed a motion with the First Department for leave to appeal certain rulings in the May 16, 2017 decision to the Court of Appeals, which Countrywide opposed. On July 25, 2017 the First Department granted Ambac Assurance’s motion. The briefing for the appeal has been completed and oral argument is scheduled for June 6, 2018.

• The Segregated Account of Ambac Assurance Corporation and Ambac Assurance Corporation v. Countrywide Home Loans, Inc. (Wisconsin Circuit Court for Dane County, Case No 14 CV 3511, filed on December 30, 2014). On June 23, 2016, the Wisconsin Court of Appeals reversed the trial court’s prior dismissal of the complaint, and on October 11, 2016, the Wisconsin Supreme Court granted Countrywide’s petition for review of the June 23 decision by the Wisconsin Court of Appeals. The Wisconsin Supreme Court appeal was argued on February 28, 2017. On June 30, 2017, the Wisconsin Supreme Court reversed the decision of the Wisconsin Court of Appeals and remanded the case to the Wisconsin Court of Appeals for further proceedings. On December 14, 2017, the Wisconsin Court of Appeals affirmed the trial court’s July 2, 2015 decision dismissing the case for lack of personal jurisdiction. On January 16, 2018, Ambac Assurance filed a petition with the Supreme Court of Wisconsin for review of the December 14, 2017 decision. On January 30, 2018, Countrywide opposed the petition. On March 13, 2018, the Wisconsin Supreme Court denied Ambac Assurance’s petition for review, ending the Wisconsin Action. In the 2015 New York Action, on September 20, 2016, the New York Court granted Ambac Assurance’s motion to stay, holding Countrywide’s motion to dismiss the complaint in abeyance pending resolution of the Wisconsin Action. On March 30, 2018, the court vacated its stay of the 2015 New York Action, and the parties submitted supplemental letter briefs on April 11, 2018 addressing newly-issued authority relevant to Countrywide’s pending motion to dismiss, which was restored to the calendar.

• Ambac Assurance Corporation and The Segregated Account of Ambac Assurance Corporation v. U.S. Bank National Association (United States District Court, Southern District of New York, Docket No. 17-cv-00446 (SHS), filed January 20, 2017). On December 6, 2017, the court granted U.S. Bank’s motion for reconsideration and granted U.S. Bank’s motion to dismiss, and on January 18, 2018, the court issued an opinion memorializing the reasons for its decision. Ambac did not appeal that decision, and judgment was entered on March 5, 2018. On March 6, 2017, U.S. Bank filed a trust instruction proceeding in Minnesota state court concerning the proposed settlement, which is captioned, In the matter of HarborView Mortgage Loan Trust 2005-10, No. 27-TR-CV-17-32 (the “Minnesota Action”). On April 5, 2017, Ambac Assurance filed a motion to dismiss the Minnesota Action. On June 12, 2017, U.S. Bank filed an amended petition in the Minnesota Action, and on July 7, 2017 Ambac Assurance filed a renewed motion to dismiss, which U.S. Bank opposed. On November 13, 2017, the court denied the motion to dismiss the proceeding. On February 7, 2018, Ambac Assurance appealed this dismissal and U.S Bank opposed the appeal. Oral argument is scheduled for June 7, 2018. Additionally, certain certificateholders have objected or otherwise responded to the petition filed by U.S. Bank.

• Ambac Assurance Corporation v. U.S. Bank National Association (United States District Court, Southern District of New York, Docket No. 17-cv-02614, filed April 11, 2017). On September 15, 2017, U.S. Bank filed a motion to dismiss, which Ambac Assurance opposed on October 13, 2017. Oral argument on that motion was held on November 17, 2017. On March 12, 2018, Ambac Assurance filed an Amended Complaint removing the Segregated Account as a plaintiff. As a result, defendant agreed to withdraw certain arguments in support of its motion to dismiss. The remainder of the motion remains pending.

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Basis of Presentation and Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies [Text Block]

Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial reporting and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and disclosures required by GAAP for annual periods. These consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2017. The accompanying consolidated financial statements have not been audited by an independent registered public accounting firm in accordance with the standards of the Public Company Accounting Oversight Board (U.S.), but in the opinion of management such financial statements include all adjustments necessary for the fair presentation of the Company’s consolidated financial position and results of operations. All intercompany balances and transactions have been eliminated. The results of operations for the three months ended March 31, 2018 may not be indicative of the results that may be expected for the year ending December 31, 2018. The December 31, 2017 consolidated balance sheet was derived from audited financial statements.

The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. As additional information becomes available or actual amounts become determinable, the recorded estimates are revised and reflected in operating results.

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency:

Financial statement accounts expressed in foreign currencies are translated into U.S. dollars in accordance with the Foreign Currency Matters Topic of the ASC. The functional currencies of Ambac's subsidiaries are the local currencies of the country where the respective subsidiaries are based, which are also the primary operating environments in which the subsidiaries operate.

Foreign currency translation: Functional currency assets and liabilities of Ambac’s foreign subsidiaries are translated into U.S. dollars using exchange rates in effect at the balance sheet dates and the related translation adjustments, net of deferred taxes, are included as a component of Accumulated Other Comprehensive Income in Stockholders' Equity. Functional currency operating results of foreign subsidiaries are translated using average exchange rates.

Foreign currency transactions: The impact of non-functional currency transactions and the remeasurement of non-functional currency assets and liabilities into the respective subsidiaries' functional currency (collectively "foreign currency transactions gains/(losses)") are $5,018 and $6,465 for the three months endedMarch 31, 2018 and 2017. Foreign currency transactions gains/(losses) are primarily the result of remeasuring Ambac UK's assets and liabilities denominated in currencies other than its functional currency, primarily the U.S. dollar and the Euro. The significant components of foreign currency transaction gains/(losses), including the respective classifications in the Consolidated Statement of Total Comprehensive Income, are as follows:

• Remeasurement of loss reserves, classified in Loss and loss expenses, in the amount of $11,016 and $5,827 for the three months endedMarch 31, 2018 and 2017, respectively;

• Realized gain (losses) from the sale of investment securities and the unrealized gains (losses) on trading and short-term investment securities, classified in Net realized investment gains, in the amount of $(4,804) and $1,916 for the three months endedMarch 31, 2018 and 2017, respectively;

• Remeasurement of premium receivables, classified in Other income, in the amount of $(1,387) and $(560) for the three months endedMarch 31, 2018 and 2017, respectively; and

• Remeasurement of credit derivative liabilities, classified in Net change in fair value of credit derivative, in the amount of $(25) and $(706) for the three months endedMarch 31, 2018 and 2017, respectively.

Reclassifications

Reclassifications:

Reclassifications have been made to prior years' amounts to conform to the current year's presentation. Such reclassifications are primarily the result of certain new standards discussed in the Recently Adopted Accounting Standards section below.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Adopted Accounting Standards:

Effective January 1, 2018, Ambac adopted the following accounting standards:

Stock Compensation--Scope of Modification Accounting

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718) - Scope of Modification Accounting. The ASU provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. Entities will apply the modification accounting guidance if the value, vesting conditions or classification of the award changes. The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this ASU. The adoption of this ASU did not have an impact on Ambac's financial statements.

Net Periodic Pension and Postretirement Costs

In March 2017, the FASB issued ASU 2017-07, Compensation-Retirement Benefits (Topic 715) - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. The objective of the ASU is to increase transparency in the reporting of net pension cost and net postretirement cost (collectively "net benefit cost"). The ASU requires that the service cost component of net benefit cost be reported on the same line item as other compensation costs arising from services rendered by employees. It further requires that the other components of net benefit costs (i.e. interest costs, amortization of prior service cost, etc.) be presented separately from the service cost component and outside the subtotal of income from operations, if one is presented. Prior to adoption of this ASU, Ambac reported all postretirement costs in Operating expenses on the Consolidated Statements of Total Comprehensive Income (Loss). Adoption of this ASU resulted in a reclassification of other non-service related costs from Operating expenses to Other income (expense) of $144 for the three months ended March 31, 2017.

Restricted Cash

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash. Prior to the effective date of this ASU, GAAP did not include specific guidance on the cash flow classification and presentation of changes in restricted cash and restricted cash flow equivalents other than limited guidance for non-for-profit entities. This ASU is intended to resolve diversity in practice in the classification of changes in restricted cash and restricted cash flow equivalents on the statement of cash flows. The ASU requires that restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning and ending period amounts on the statement of cash flows, along with certain disclosures. Adoption of this ASU resulted in the inclusion of restricted cash activity related to consolidated VIEs on the Consolidated Statements of Cash Flows for the three months ended March 31, 2018 and March 31, 2017. Also refer to the Supplemental Disclosure of Cash Flow Information section above for the reconciliation of cash, cash equivalents, and restricted cash reported on the Consolidated Statement of Position that sum to the total of the same such amounts on the Consolidated Statements of Cash Flows.

Income Taxes

In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740) - Intra-Entity Transfers of Assets Other Than Inventory. Prior to the effective date of this ASU, GAAP prohibited the recognition of current and deferred income taxes for intercompany transfers of assets until the asset had been sold to an outside party. The ASU requires companies to recognize the income tax effects of intercompany sales and transfers of assets other than inventory, as income tax expense (or benefit) in the period in which the transfer occurs. The adoption of this ASU did not have an impact on Ambac's financial statements.

Classification of Certain Cash Receipts and Cash Payments

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) - Classification of Certain Cash Receipts and Cash Payments. The ASU resolves diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. Transactions addressed in the ASU that are potentially relevant to Ambac include the following:

• Debt prepayment or debt extinguishment costs - Such payments will be classified as a financing cash outflow.

• Settlement of zero-coupon debt or other debt with coupon rates that are insignificant in relation to the effective interest rate of the borrowing - The portion of the cash payment attributable to accreted interest will be classified as an operating cash outflow and the portion attributable to the principal will be classified as a financing cash outflow.

• Distributions from equity-method investees - An entity will elect one of the two following approaches. Under the "cumulative earnings approach": i) distributions received up to the amount of cumulative earnings recognized will be treated as returns on investments and classified as cash inflows from operating activities and ii) distributions received in excess of earnings recognized will be treated as returns of investments and classified as cash inflows from investing activities. Under the "nature of the distribution" approach, distributions received will be classified based on the nature of the activity that generated the distribution (i.e. classified as a return on investment or return of investment), when such information is available to the investor.

• Beneficial interests in securitization transactions - Any beneficial interests obtained in financial assets transferred to an unconsolidated securitization entity will be disclosed as a non-cash investing activity. Subsequent cash receipts from the beneficial interests in previously transferred trade receivables will be classified as cash inflows from investing activities.

The adoption of this ASU did not have an impact on Ambac's financial statements.

Recognition and Measurement of Financial Assets and Liabilities

In January 2016, the FASB issued ASC 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU makes the following targeted changes for financial assets and liabilities: i) requires equity investments with readily determinable fair values to be measured at fair value with changes recognized in net income; ii) simplifies the impairment assessment of equity securities without readily determinable fair values using a qualitative approach; iii) eliminates disclosure of the method and significant assumptions used to fair value instruments measured at amortized cost on the balance sheet; iv) requires the use of the exit price notion when measuring the fair value of instruments for disclosure purposes; v) for financial liabilities where the fair value option has been elected, requires the portion of the fair value change related to instrument-specific credit risk, to be separately reported in other comprehensive income; vi) requires the separate presentation of financial assets and liabilities by measurement category and form of financial asset (liability) on the balance sheet or accompanying notes; and vii) clarifies that the evaluation of a valuation allowance on a deferred tax asset related to available-for-sale securities should be performed in combination with the entity's other deferred tax assets.

With respect to item (v) above, Ambac has elected the fair value option for all VIE financial liabilities. For these VIE liabilities this ASU has resulted in a cumulative-effect reclassification of $2,900, net of deferred tax of $590, between Retained earnings and Accumulated other comprehensive income, with no net change to Total stockholders' equity as of January 1, 2018. For the three months ended March 31, 2018 and going forward, the instrument-specific credit risk of fair value changes in VIE liabilities has been and will be reported in Accumulated other comprehensive income in accordance with this ASU, with all other fair value changes continuing to be reported through net income. There was no material impact on Ambac's financial statements for the other provisions of this ASU.

Revenue recognition

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) that amends the accounting guidance for recognizing revenue for contracts with customers to transfer goods and contracts for the transfer of non-financial assets unless those contracts are within the scope of other accounting standards. As this ASU does not apply to insurance contracts and most financial instruments management determined there was no impact on Ambac's financial statements.

Description of New Accounting Pronouncements Not yet Adopted [Text Block]

Future Application of Accounting Standards:

Equity-linked instruments with down round features

In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260) and Derivatives and Hedging (Topic 815) - Accounting for Certain Financial Instruments with Down Round Features. Equity-linked instruments, such as warrants and convertible instruments may contain down round features that result in the strike price being reduced on the basis of the pricing of future equity offerings. Under the ASU, a down round feature will no longer require a freestanding equity-linked instrument (or embedded conversion option) to be classified as a liability that is remeasured at fair value through the income statement (i.e. marked-to-market). However, other features of the equity-linked instrument (or embedded conversion option) must still be evaluated to determine whether liability or equity classification is appropriate. Equity classified instruments are not marked-to-market. For earnings per share ("EPS") reporting, the ASU requires companies to recognize the effect of the down round feature only when it is triggered by treating it as a dividend and as a reduction of income available to common stockholders in basic EPS. The amendments in this ASU are effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in any interim period. Ambac will adopt this ASU on January 1, 2019. The adoption of this ASU is not expected to have a consequential impact on Ambac's financial statements.

Premium Amortization on Callable Debt Securities

In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20) - Premium Amortization on Purchased Callable Debt Securities. The ASU shortens the amortization period for the premium on callable debt securities to the earliest call date. Under current GAAP, a reporting entity generally amortizes the premium as yield adjustment over the contractual life (i.e. maturity) of the debt security and if that debt security is called, the entity would record a loss equal to the unamortized premium. The ASU does not change the accounting for callable debt securities held at a discount, which will continue to be amortized to maturity. ASU 2017-08 is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted. The ASU must be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Ambac will adopt this ASU on January 1, 2019 and we are evaluating its impact on Ambac's financial statements.

Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) - Measurement of Credit Losses on Financial Instruments. This ASU significantly affects how reporting entities will measure credit losses for financial assets that are not accounted for at fair value through net income, which include loans, debt securities, trade receivables, net investments in leases, and certain off-balance sheet credit exposures. For financial assets measured at amortized cost, the ASU replaces the "incurred loss" model, which generally delayed recognition of the full amount of credit losses until the loss was probable of occurring, with an "expected loss" model, which reflects an entity's current estimate of all expected credit losses. Expected credit losses for amortized cost assets will be recorded as a valuation allowance, with subsequent increases or decreases in the allowance reflected in the income statement each period. For available-for-sale debt securities, credit losses under the ASU will be measured similarly to current GAAP. However, under the ASU, credit losses for available-for-sale securities will be recorded as a valuation allowance (similar to the amortized cost assets approach described above), rather than as a direct write-down of the security as is required under current GAAP. As a result, improvements to estimated credit losses for available-for-sale debt securities will be recognized immediately in the income statement rather than as interest income over time. The ASU is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted as of the fiscal year beginning after December 15, 2018. Ambac has not determined whether it will early adopt this ASU and we are currently evaluating its impact on Ambac's financial statements. The significant implementation matters to be addressed include identifying the inventory of financial assets that will be affected by this standard, identifying new data requirements and data sources for implementing the expected loss model for those instruments not already using this model and identifying and documenting accounting process changes, including related controls.

Leases

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main difference between current U.S. GAAP and this ASU is the recognition of lease assets and lease liabilities for those leases classified as operating leases. For operating leases, a lessee is required to: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the balance sheet, 2) recognize a single lease cost, calculated so that the cost is allocated over the lease term generally on a straight-line basis and 3) classify all cash payment within operating activities in the statement of cash flows. The ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The transition guidance requires lessees to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach which include a number of optional practical expedients. We will adopt ASU 2015-02 on January 1, 2019. We are evaluating the impact of this ASU, including the transitional practical expedients, on Ambac's financial statements. We believe Ambac's office leases will be the most significantly impacted by this ASU. The significant implementation matters to be addressed include identifying the remaining inventory of leases (i.e. equipment and other) that will be affected by this standard and identifying and documenting accounting process changes, including related controls.

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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2018

Schedule of Cash Flow Supplemental Information [Line Items]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

Supplemental Disclosure of Cash Flow Information

	Three Months Ended March 31,
	2018	2017
Cash paid during the period for:
Income taxes	9,718	8,295
Interest on long-term debt and investment agreements	100,958	20,496
Non-cash financing activities:
Decrease in long-term debt as a result of an exchange for investment securities	—	55,426
Reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets to the Consolidated Statements of Cash Flows:
Cash and cash equivalents	38,485	118,772
Restricted cash	1,134	5,005
Total cash, cash equivalents, and restricted cash shown on the Consolidated Statements of Cash Flows	39,619	123,777

In addition to the non-cash financing activities disclosed in the above table, the Rehabilitation Exit Transactions involved the exchange of cash and non-cash consideration for the discharge of all Deferred Amounts and cancellation of certain General Account Surplus Notes. Refer to Note 1. Background and Business Description of this Form 10-Q and Note 1. Background and Business Description in the Notes to Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 for further details of the transactions.

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Special Purpose Entities, Including Variable Interest Entities (Tables)

3 Months Ended

Mar. 31, 2018

Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]

Components of VIE Gain (Loss) [Table Text Block]

Below is a schedule detailing the change in fair value of the various financial instruments within the consolidated FG VIEs, along with gains (losses) from consolidating and deconsolidating FG VIEs that together comprise Income (loss) on variable interest entities for the affected periods:

	Three Months Ended March 31,
	2018			2017
Income (loss) on changes related to:
Net change in fair value of VIE assets and liabilities	$	1,918		$	3,701
Less: Credit risk changes of fair value liabilities	(1,344		)	—
Consolidation / Deconsolidation	—			—
Income (loss) on Variable Interest Entities	$	574		$	3,701

Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities

The table below provides the fair value of fixed income securities, by asset-type, held by consolidated VIEs as of March 31, 2018 and December 31, 2017:

	March 31, 2018		December 31, 2017
Investments:
Corporate obligations	$	2,955,763	$	2,914,145
Total variable interest entity assets: fixed income securities	$	2,955,763	$	2,914,145

Supplemental Information about Loans Held as Assets and Long-Term Debt Associated with Consolidated Variable Interest Entities

The following table provides supplemental information about the loans held as assets and long-term debt associated with the VIEs for which the fair value option has been elected as of March 31, 2018 and December 31, 2017:

	Estimated Fair Value		Unpaid Principal Balance
March 31, 2018:
Loans	$	11,558,331	$	8,413,664
Long-term debt	12,270,124		9,679,441
December 31, 2017:
Loans	$	11,529,384	$	8,168,651
Long-term debt	12,160,544		9,387,884

Summary of Carrying Amount of Assets, Liabilities and Maximum Exposure to Loss of Ambac's Variable Interests in Non-Consolidated Variable Interest Entities

The following table displays the carrying amount of the assets, liabilities and maximum exposure to loss of Ambac’s variable interests in non-consolidated VIEs resulting from financial guarantee and derivative contracts by major underlying asset classes, as of March 31, 2018 and December 31, 2017:

	Carrying Value of Assets and Liabilities
	Maximum Exposure To Loss (1)		Insurance Assets (2)		Insurance Liabilities (3)		Net Derivative Assets (Liabilities) (4)
March 31, 2018:
Global structured finance:
Collateralized debt obligations	$	31,644	$	157	$	2	$	(13	)
Mortgage-backed—residential	8,033,584		1,742,097		670,052		—
Other consumer asset-backed	2,209,778		22,416		331,147		—
Other commercial asset-backed	934,919		27,527		30,837		—
Other	2,482,479		57,718		302,232		7,751
Total global structured finance	13,692,404		1,849,915		1,334,270		7,738
Global public finance	25,695,196		345,678		379,521		(1,005		)
Total	$	39,387,600	$	2,195,593	$	1,713,791	$	6,733
December 31, 2017:
Global structured finance:
Collateralized debt obligations	$	35,555	$	169	$	1	$	(15	)
Mortgage-backed—residential	12,766,685		619,848		3,218,356		—
Other consumer asset-backed	2,266,610		23,405		328,732		—
Other commercial asset-backed	987,797		30,413		35,976		—
Other	2,513,304		60,086		306,457		10,311
Total global structured finance	18,569,951		733,921		3,889,522		10,296
Global public finance	25,629,816		335,347		371,056		(551		)
Total	$	44,199,767	$	1,069,268	$	4,260,578	$	9,745

(1) Maximum exposure to loss represents the maximum future payments of principal and interest on insured obligations and derivative contracts plus Deferred Amounts and accrued and unpaid interest thereon. On February 12, 2018, all Deferred Amounts and Interest Accrued on Deferred Amounts were settled in connection with the Rehabilitation Exit Transactions. Ambac’s maximum exposure to loss does not include the benefit of any financial instruments (such as reinsurance or hedge contracts) that Ambac may utilize to mitigate the risks associated with these variable interests.

(2) Insurance assets represent the amount recorded in “Premium receivables” and “Subrogation recoverable” for financial guarantee contracts on Ambac’s Consolidated Balance Sheets.

(3) Insurance liabilities represent the amount recorded in “Loss and loss expense reserves” and “Unearned premiums” for financial guarantee contracts on Ambac’s Consolidated Balance Sheets.

(4) Net derivative assets (liabilities) represent the fair value recognized on credit derivative contracts and interest rate swaps on Ambac’s Consolidated Balance Sheets.

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Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income

The following tables detail the changes in the balances of each component of accumulated other comprehensive income for the affected periods:

	Unrealized Gains (Losses) on Available for Sale Securities (1)			Amortization of Postretirement Benefit (1)			Gain (Loss) on Foreign Currency Translation (1)			Credit Risk Changes of Fair Value Option Liabilities (1) (2)			Total
Three Months Ended March 31, 2018:
Beginning Balance	$	30,755		$	10,640		$	(93,634	)	$	—		$	(52,239	)
Adjustment to opening balance, net of taxes (3)	—			—			—			(2,900		)	(2,900		)
Adjusted balance, beginning of period	30,755			10,640			(93,634		)	(2,900		)	(55,139		)
Other comprehensive income (loss) before reclassifications	125,159			(556		)	32,056			—			156,659
Amounts reclassified from accumulated other comprehensive income (loss)	(2,855		)	(303		)	—			1,114			(2,044		)
Net current period other comprehensive income (loss)	122,304			(859		)	32,056			1,114			154,615
Balance at March 31, 2018	$	153,059		$	9,781		$	(61,578	)	$	(1,786	)	$	99,476
Three Months Ended March 31, 2017:
Beginning Balance	$	118,863		$	9,367		$	(167,220	)	$	—		$	(38,990	)
Other comprehensive income (loss) before reclassifications	12,500			2,625			12,593			—			27,718
Amounts reclassified from accumulated other comprehensive income (loss)	8,835			(338		)	—			—			8,497
Net current period other comprehensive income (loss)	21,335			2,287			12,593			—			36,215
Balance at March 31, 2017	$	140,198		$	11,654		$	(154,627	)	$	—		$	(2,775	)

(1) All amounts are net of tax and noncontrolling interest. Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income.

Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income

The following table details the significant amounts reclassified from each component of accumulated other comprehensive income, shown in the above rollforward tables, for the affected periods:

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income (1)						Affected Line Item in the Consolidated Statement of Total Comprehensive Income (Loss)
	Three Months Ended March 31,
	2018			2017
Unrealized Gains (Losses) on Available-for-Sale Securities
	$	(4,563	)	$	8,835		Net realized investment gains (losses) and other-than-temporary impairment losses
	1,708			—			Provision for income taxes
	$	(2,855	)	$	8,835		Net of tax and noncontrolling interest
Amortization of Postretirement Benefit
Prior service cost	$	(241	)	$	(241	)	Other income (2)
Actuarial (losses)	(62		)	(97		)	Other income (2)
	(303		)	(338		)	Total before tax
	—			—			Provision for income taxes
	(303		)	(338		)	Net of tax and noncontrolling interest
Credit risk changes of fair value option liabilities
	$	1,344		$	—		Credit Risk Changes of Fair Value Option Liabilities
	(230		)	—			Provision for income taxes
	$	1,114		$	—		Net of tax and noncontrolling interest
Total reclassifications for the period	$	(2,044	)	$	8,497		Net of tax and noncontrolling interest

(1) Amounts in parentheses indicate reductions to Accumulated Other Comprehensive Income with corresponding increases to the affected line items in the Consolidated Statement of Total Comprehensive Income.

(2) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost.

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Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share

The following table provides a reconciliation of the common shares used for basic net income per share to the diluted shares used for diluted net income per share:

	Three Months Ended March 31,
	2018	2017
Basic weighted average shares outstanding	45,471,083	45,292,253
Effect of potential dilutive shares (1):
Warrants	—	—
Restricted stock units	45,713	—
Performance stock units	136,675	—
Diluted weighted average shares outstanding	45,653,471	45,292,253
Anti-dilutive shares excluded from the above reconciliation:
Stock options	126,667	126,667
Warrants	4,053,476	4,053,670
Restricted stock units	—	94,204
Performance stock units (2)	—	342,456

(1) For the three months ended March 31, 2017, Ambac had a net loss and accordingly excluded all potentially dilutive securities from the determination of diluted loss per share as their impact was anti-dilutive.

(2) Performance stock units are reflected herein at their target issuance amounts. Vesting of these units is contingent upon meeting certain performance metrics. Although a portion of these performance metrics have been achieved as of the respective period end, it is possible that awards may no longer meet the metric at the end of the performance period.

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Financial Guarantee Insurance Contracts (Tables)

3 Months Ended

Mar. 31, 2018

Insurance [Line Items]

Schedule of Loss And Loss Expense Reserves And Subrogation Recoverable Table [Table Text Block]

Below are the components of the Loss and loss expense reserves liability and the Subrogation recoverable asset at March 31, 2018 and December 31, 2017:

	Unpaid Claims				Present Value of Expected Net Cash Flows
Balance Sheet Line Item	Claims		Accrued Interest		Claims and Loss Expenses		Recoveries			Unearned Premium Revenue			Gross Loss and Loss Expense Reserves
March 31, 2018:
Loss and loss expense reserves	$	—	$	—	$	2,592,778	$	(324,936	)	$	(128,741	)	$	2,139,101
Subrogation recoverable	—		—		275,425		(2,170,203		)	—			(1,894,778		)
Totals	$	—	$	—	$	2,868,203	$	(2,495,139	)	$	(128,741	)	$	244,323
December 31, 2017:
Loss and loss expense reserves	$	2,411,632	$	667,988	$	2,855,010	$	(1,054,113	)	$	(135,502	)	$	4,745,015
Subrogation recoverable	615,391		171,755		102,171		(1,520,530		)	—			(631,213		)
Totals	$	3,027,023	$	839,743	$	2,957,181	$	(2,574,643	)	$	(135,502	)	$	4,113,802

Summary of Gross Premium Receivable Roll-Forward (Direct and Assumed Contracts)

Below is the gross premium receivable roll-forward for the affected periods:

	Three Months Ended March 31,
	2018			2017
Beginning premium receivable	$	586,312		$	661,337
Premium receipts	(15,381		)	(17,978		)
Adjustments for changes in expected and contractual cash flows	(1,289		)	1,352
Accretion of premium receivable discount	3,846			4,244
Changes to uncollectable premiums	604			(12		)
Other adjustments (including foreign exchange)	6,615			3,734
Ending premium receivable (1)	$	580,707		$	652,677

(1) Gross premium receivable includes premiums to be received in foreign denominated currencies most notably in British Pounds and Euros. At March 31, 2018 and 2017, premium receivables include British Pounds of $163,926 (£116,815) and $185,204 (£147,726), respectively, and Euros of $36,679 (€29,767) and $34,908 (€32,671), respectively.

Effect of Reinsurance on Premiums Written and Earned

The effect of reinsurance on premiums written and earned for the respective periods was as follows:

	Three Months Ended March 31,
	2018					2017
	Written			Earned		Written			Earned
Direct	$	4,261		$	32,609	$	5,584		$	52,065
Assumed	—			19		—			21
Ceded	(819		)	1,745		(1,815		)	4,473
Net premiums	$	5,080		$	30,883	$	7,399		$	47,613

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

The following table summarizes net premiums earned by location of risk for the respective periods:

	Three Months Ended March 31,
	2018		2017
United States	$	24,718	$	40,621
United Kingdom	4,856		5,263
Other international	1,309		1,729
Total	$	30,883	$	47,613

Summarized Future Gross Undiscounted Premiums Expected to be Collected and Future Expected Premiums Earned, Net of Reinsurance

The table below summarizes the future gross undiscounted premiums to be collected and future premiums earned, net of reinsurance at March 31, 2018:

	Future Premiums to be Collected (1)		Future Premiums to be Earned Net of Reinsurance (1)
Three months ended:
June 30, 2018	$	14,957	$	17,037
September 30, 2018	14,771		16,388
December 31, 2018	12,947		15,946
Twelve months ended:
December 31, 2019	55,142		60,697
December 31, 2020	52,344		56,759
December 31, 2021	45,913		51,792
December 31, 2022	43,923		48,292
Five years ended:
December 31, 2027	195,614		196,972
December 31, 2032	153,584		132,598
December 31, 2037	85,689		73,307
December 31, 2042	31,028		25,070
December 31, 2047	14,425		12,798
December 31, 2052	3,620		4,656
December 31, 2057	92		297
Total	$	724,049	$	712,609

(1) Future premiums to be collected are undiscounted and are used to derive the discounted premium receivable asset recorded on Ambac's balance sheet. Future premiums to be earned, net of reinsurance relate to the unearned premiums liability and deferred ceded premium asset recorded on Ambac’s balance sheet. The use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral is required in the calculation of the premium receivable, as further described in Note 2. Basis of Presentation and Significant Accounting Policies in the Notes to Consolidated Financial Statements included in Ambac's Annual Report on Form 10-K for the year ended December 31, 2017. This results in a different premium receivable balance than if expected lives were considered. If installment paying policies are retired or prepay early, premiums reflected in the premium receivable asset and amounts reported in the above table for such policies may not be collected. Future premiums to be earned also considers the use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral, which may result in different unearned premium than if expected lives were considered. If those bonds types are retired early, premium earnings may be negative in the period of call or refinancing.

Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance

Below is the loss and loss expense reserve roll-forward, net of subrogation recoverable and reinsurance, for the affected periods:

	Three Months Ended March 31,
	2018			2017
Beginning gross loss and loss expense reserves	$	4,113,802		$	3,696,038
Reinsurance recoverable	40,658			30,767
Beginning balance of net loss and loss expense reserves	4,073,144			3,665,271
Losses and loss expenses (benefit):
Current year	778			1,543
Prior year	(248,173		)	133,468
Total (1) (2) (3)	(247,395		)	135,011
Loss and loss expenses (recovered) paid:
Current year	—			696
Prior year (3)	3,631,177			9,749
Total	3,631,177			10,445
Foreign exchange effect	11,016			5,827
Ending net loss and loss expense reserves	205,588			3,795,664
Reinsurance recoverable (4)	38,735			34,691
Ending gross loss and loss expense reserves (5)	$	244,323		$	3,830,355

(1) Total losses and loss expenses (benefit) includes $1,354 and $(4,112) for the three months ended March 31, 2018 and 2017, respectively, related to ceded reinsurance.

(2) Ambac records the impact of estimated recoveries related to securitized loans in RMBS transactions that breached certain R&Ws within losses and loss expenses (benefit). The losses and loss expense (benefit) incurred associated with changes in estimated representation and warranties for the three months ended March 31, 2018 and 2017 was $800 and $13,797, respectively.

(3) On February 12, 2018, Deferred Amounts and Interest Accrued on Deferred Amounts in the amount of $3,000,158 and $856,834, respectively were settled in connection with the Rehabilitation Exit Transactions. 2018 includes a $288,204 loss and loss expense benefit on these settled Deferred Amounts.

(4) Represents reinsurance recoverable on future loss and loss expenses. Additionally, the Balance Sheet line "Reinsurance recoverable on paid and unpaid losses" includes reinsurance recoverables (payables) of $90 and $(418) as of March 31, 2018 and 2017, respectively, related to previously presented loss and loss expenses and subrogation.

(5) Includes Euro denominated gross loss and loss expense reserves of $21,398 (€17,366) and $20,984 (€19,639) at March 31, 2018 and 2017, respectively.

Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable

For 2017, the net adverse development in prior years was primarily driven by certain public finance transactions, primarily Puerto Rico, and interest accrued on Deferred Amounts partially offset by positive development in certain Ambac UK transactions, primarily Ballantyne. OnMarch 25, 2017, Ambac UK agreed in principle to a confidential settlement of litigation brought by Ambac UK in the name of Ballantyne against J.P. Morgan Investment Management Inc. ("JPMIM") relating to the management of Ballantyne’s investment accounts, which were funded with the proceeds of notes issued in 2006 in connection with a structured reinsurance transaction and guaranteed in part by Ambac UK. On April 11, 2017, Ambac UK, Ballantyne and JPMIM signed a settlement agreement. Pursuant to the settlement, Ballantyne received a payment of $325,600 from JPMIM in return for releases of all claims by Ballantyne and Ambac UK. As a result of the settlement, Ambac recognized an incremental benefit through a reduction in losses and loss expenses of approximately $91,600 in the first quarter of 2017. The total benefit recognized from the settlement of the litigation will reduce the ultimate Ballantyne claims Ambac UK is expecting to pay and did not result in a direct cash payment to Ambac UK.

The tables below summarize information related to policies currently included in Ambac’s loss and loss expense reserves or subrogation recoverable at March 31, 2018 and December 31, 2017. Gross par exposures include capital appreciation bonds which are reported at the par amount at the time of issuance of the insurance policy as opposed to the current accreted value of the bond. The weighted average risk-free rate used to discount loss reserves at March 31, 2018 and December 31, 2017 was 2.8% and 2.5%, respectively.

Surveillance Categories as of March 31, 2018
	I			IA			II			III			IV			V			Total
Number of policies	25			26			15			23			157			4			250
Remaining weighted-average contract period (in years) (1)	10			22			10			23			12			4			16
Gross insured contractual payments outstanding:
Principal	$	967,427		$	576,858		$	642,281		$	2,013,845		$	6,350,960		$	48,562		$	10,599,933
Interest	500,680			601,901			243,259			7,195,260			2,359,913			16,332			10,917,345
Total	$	1,468,107		$	1,178,759		$	885,540		$	9,209,105		$	8,710,873		$	64,894		$	21,517,278
Gross undiscounted claim liability	$	4,264		$	56,682		$	59,584		$	1,449,879		$	2,543,988		$	64,861		$	4,179,258
Discount, gross claim liability	(514		)	(13,866		)	(9,724		)	(693,598		)	(675,210		)	(5,113		)	(1,398,025		)
Gross claim liability before all subrogation and before reinsurance	3,750			42,816			49,860			756,281			1,868,778			59,748			2,781,233
Less:
Gross RMBS subrogation (2)	—			—			—			—			(1,861,894		)	—			(1,861,894		)
Discount, RMBS subrogation	—			—			—			—			28,384			—			28,384
Discounted RMBS subrogation, before reinsurance	—			—			—			—			(1,833,510		)	—			(1,833,510		)
Less:
Gross other subrogation (3)	—			(8,604		)	(4		)	(53,703		)	(675,089		)	(13,138		)	(750,538		)
Discount, other subrogation	—			5,810			—			9,497			69,630			3,972			88,909
Discounted other subrogation, before reinsurance	—			(2,794		)	(4		)	(44,206		)	(605,459		)	(9,166		)	(661,629		)
Gross claim liability, net of all subrogation and discounts, before reinsurance	3,750			40,022			49,856			712,075			(570,191		)	50,582			286,094
Less: Unearned premium revenue	(1,586		)	(10,092		)	(9,810		)	(44,754		)	(62,241		)	(258		)	(128,741		)
Plus: Loss expense reserves	16,141			3,082			582			11,146			56,019			—			86,970
Gross loss and loss expense reserves	$	18,305		$	33,012		$	40,628		$	678,467		$	(576,413	)	$	50,324		$	244,323
Reinsurance recoverable reported on Balance Sheet (4)	$	238		$	4,448		$	8,368		$	38,603		$	(12,832	)	$	—		$	38,825

(1) Remaining weighted-average contract period is weighted based on projected gross claims over the lives of the respective policies.

(2) RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for representation and warranty ("R&W") breaches.

(3) Other subrogation represents subrogation related to excess spread and other contractual cash flows on public finance and structured finance transactions, including RMBS.

(4) Reinsurance recoverable reported on the Balance Sheet includes reinsurance recoverables of $38,735 related to future loss and loss expenses and $90 related to presented loss and loss expenses and subrogation.

Surveillance Categories as of December 31, 2017
	I			IA			II			III			IV			V			Total
Number of policies	26			20			26			22			179			4			277
Remaining weighted-average contract period (in years) (1)	10			23			10			24			13			4			17
Gross insured contractual payments outstanding:
Principal	$	1,046,267		$	531,190		$	1,199,909		$	1,998,861		$	6,862,281		$	48,562		$	11,687,070
Interest	531,657			584,098			413,045			7,182,715			2,469,765			16,332			11,197,612
Total	$	1,577,924		$	1,115,288		$	1,612,954		$	9,181,576		$	9,332,046		$	64,894		$	22,884,682
Gross undiscounted claim liability (2)	$	4,434		$	56,659		$	77,289		$	1,412,976		$	6,409,340		$	64,863		$	8,025,561
Discount, gross claim liability	(465		)	(13,095		)	(12,250		)	(643,897		)	(616,559		)	(4,739		)	(1,291,005		)
Gross claim liability before all subrogation and before reinsurance	3,969			43,564			65,039			769,079			5,792,781			60,124			6,734,556
Less:
Gross RMBS subrogation (3)	—			—			—			—			(1,857,502		)	—			(1,857,502		)
Discount, RMBS subrogation	—			—			—			—			23,115			—			23,115
Discounted RMBS subrogation, before reinsurance	—			—			—			—			(1,834,387		)	—			(1,834,387		)
Less:
Gross other subrogation (4)	—			(7,990		)	(9,371		)	(53,070		)	(743,456		)	(13,191		)	(827,078		)
Discount, other subrogation	—			5,169			2,550			8,349			67,045			3,709			86,822
Discounted other subrogation, before reinsurance	—			(2,821		)	(6,821		)	(44,721		)	(676,411		)	(9,482		)	(740,256		)
Gross claim liability, net of all subrogation and discounts, before reinsurance	3,969			40,743			58,218			724,358			3,281,983			50,642			4,159,913
Less: Unearned premium revenue	(2,126		)	(9,990		)	(12,238		)	(46,086		)	(64,786		)	(276		)	(135,502		)
Plus: Loss expense reserves	16,116			3,242			665			13,331			56,037			—			89,391
Gross loss and loss expense reserves	$	17,959		$	33,995		$	46,645		$	691,603		$	3,273,234		$	50,366		$	4,113,802
Reinsurance recoverable reported on Balance Sheet (5)	$	202		$	4,894		$	9,424		$	38,465		$	(11,988	)	$	—		$	40,997

(1) Remaining weighted-average contract period is weighted based on projected gross claims over the lives of the respective policies.

(2) Gross undiscounted claim liability includes unpaid claims, including accrued interest on Deferred Amounts, on policies allocated to the Segregated Account and Ambac's estimate of expected future claims.

(3) RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for R&W breaches.

(4) Other subrogation represents subrogation related to excess spread and other contractual cash flows on public finance and structured finance transactions, including RMBS.

(5) Reinsurance recoverable reported on Balance Sheet includes reinsurance recoverables of $40,658 related to future loss and loss expenses and $339 related to presented loss and loss expenses and subrogation.

Summary of Balance of Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach

The balance of R&W subrogation recoveries and the related loss reserves at March 31, 2018 and December 31, 2017, are as follows:

	Gross Loss Reserves Before Subrogation Recoveries (1)		Subrogation Recoveries (2)(3)			Gross Loss Reserves After Subrogation Recoveries
At March 31, 2018	$	171,999	$	(1,833,510	)	$	(1,661,511	)
At December 31, 2017	$	1,366,483	$	(1,834,387	)	$	(467,904	)

(1) Amount represents gross loss reserves for policies that have established a representation and warranty subrogation recovery.December 31, 2017 includes unpaid RMBS claims (including accrued interest on Deferred Amounts) on policies allocated to the Segregated Account, such balances have been settled via the Rehabilitation Exit Transactions.

(2) The amount of recorded subrogation recoveries related to each securitization is limited to ever-to-date paid and unpaid losses plus the present value of expected future cash flows for each policy. To the extent losses have been paid but not yet fully recovered, the recorded amount of R&W subrogation recoveries may exceed the sum of the unpaid claims and the present value of expected cash out flows for a given policy. The net cash inflow for these policies is recorded as a “Subrogation recoverable” asset. For those transactions where the subrogation recovery is less than the sum of unpaid claims and the present value of expected cash flows, the net cash outflow for these policies is recorded as a “Loss and loss expense reserves” liability.

(3) The sponsor’s repurchase obligation may differ depending on the terms of the particular transaction and the status of the specific loan, such as whether it is performing or has been liquidated or charged off.

Summary of Rollforward of RMBS Subrogation, by Estimation Approach

Below is the rollforward of R&W subrogation for the affected periods:

	Three Months Ended March 31,
	2018			2017
Discounted R&W subrogation (gross of reinsurance) at beginning of period	$	1,834,387		$	1,907,035
Changes recognized during the period:
All other changes (1)	(877		)	(14,061		)
Discounted R&W subrogation (gross of reinsurance) at end of period	$	1,833,510		$	1,892,974

(1) All other changes which may impact R&W subrogation recoveries include changes in actual or projected collateral performance, changes in the creditworthiness of a sponsor and/or the projected timing of recoveries. All other changes may also include estimates of potential sponsor settlements that may not have been subject to a sampling approach. Those that have not been subject to a sampling approach are not material to Ambac’s financial results and therefore are included in this table.

Insurance Intangible Asset [Member]

Insurance [Line Items]

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The estimated future amortization expense for the net insurance intangible asset is as follows:

	2018		2019		2020		2021		2022		Thereafter
Amortization expense (1)	$	55,687	$	68,517	$	63,475	$	57,891	$	53,816	$	533,654

(1) Future amortization considers the use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay certain obligations. If those bonds types are retired early, amortization expense may differ in the period of call or refinancing.

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities

The following table sets forth the carrying amount and fair value of Ambac’s financial assets and liabilities as of March 31, 2018 and December 31, 2017, including the level within the fair value hierarchy at which fair value measurements are categorized. As required by the Fair Value Measurement Topic of the ASC, financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

	Carrying Amount			Total Fair Value			Fair Value Measurements Categorized as:
March 31, 2018:							Level 1		Level 2			Level 3
Financial assets:
Fixed income securities:
Municipal obligations	$	855,387		$	855,387		$	—	$	855,387		$	—
Corporate obligations	1,438,993			1,438,993			450		1,438,543			—
Foreign obligations	26,395			26,395			25,492		903			—
U.S. government obligations	87,261			87,261			87,261		—			—
Residential mortgage-backed securities	823,296			823,296			—		817,987			5,309
Collateralized debt obligations	50,958			50,958			—		50,958			—
Other asset-backed securities	589,648			589,648			—		517,327			72,321
Fixed income securities, pledged as collateral:
U.S. government obligations	84,240			84,240			84,240		—			—
Short term investments	321,119			321,119			269,171		51,948			—
Other investments (1)	419,896			402,072			57,535		—			18,385
Cash and cash equivalents	38,485			38,485			35,033		3,452			—
Loans	10,643			12,042			—		—			12,042
Derivative assets:
Interest rate swaps—asset position	60,198			60,198			—		9,272			50,926
Interest rate swaps—liability position	(2		)	(2		)	—		(2		)	—
Other assets	5,621			5,621			—		—			5,621
Variable interest entity assets:
Fixed income securities:
Corporate obligations	2,955,763			2,955,763			—		—			2,955,763
Restricted cash	1,134			1,134			1,134		—			—
Loans	11,558,331			11,558,331			—		—			11,558,331
Derivative assets:
Currency swaps-asset position	46,260			46,260			—		46,260			—
Total financial assets	$	19,289,386		$	19,272,961		$	476,076	$	3,792,035		$	14,678,698
Financial liabilities:
Long term debt, including accrued interest	$	3,201,931		$	3,265,029		$	—	$	2,651,952		$	613,077
Derivative liabilities:
Credit derivatives	1,018			1,018			—		—			1,018
Interest rate swaps—liability position	70,566			70,566			—		70,566			—
Liabilities for net financial guarantees written (2)	(432,722		)	900,880			—		—			900,880
Variable interest entity liabilities:
Long-term debt	12,270,124			12,270,124			—		9,573,607			2,696,517
Derivative liabilities:
Interest rate swaps—liability position	2,155,456			2,155,456			—		2,155,456			—
Total financial liabilities	$	17,266,373		$	18,663,073		$	—	$	14,451,581		$	4,211,492

	Carrying Amount			Total Fair Value			Fair Value Measurements Categorized as:
December 31, 2017:							Level 1		Level 2			Level 3
Financial assets:
Fixed income securities:
Municipal obligations	$	779,834		$	779,834		$	—	$	779,834		$	—
Corporate obligations	860,075			860,075			450		859,625			—
Foreign obligations	26,543			26,543			25,615		928			—
U.S. government obligations	85,408			85,408			85,408		—			—
Residential mortgage-backed securities	2,251,333			2,251,333			—		1,515,316			736,017
Collateralized debt obligations	51,037			51,037			—		51,037			—
Other asset-backed securities	597,942			597,942			—		525,402			72,540
Fixed income securities, pledged as collateral:
U.S. government obligations	99,719			99,719			99,719		—			—
Short term investments	557,270			557,270			389,299		167,971			—
Other investments (1)	431,630			413,977			56,498		29,750			17,288
Cash and cash equivalents	623,703			623,703			615,073		8,630			—
Loans	10,358			10,284			—		—			10,284
Derivative assets:
Interest rate swaps—asset position	73,199			73,199			—		11,825			61,374
Other assets	5,979			5,979			—		—			5,979
Variable interest entity assets:
Fixed income securities:
Corporate obligations	2,914,145			2,914,145			—		—			2,914,145
Restricted cash	978			978			978		—			—
Loans	11,529,384			11,529,384			—		—			11,529,384
Derivative assets:
Currency swaps—asset position	54,877			54,877			—		54,877			—
Total financial assets	$	20,853,695		$	20,835,968		$	1,173,321	$	4,005,195		$	15,347,011
Financial liabilities:
Long term debt, including accrued interest	$	1,428,680		$	1,369,499		$	—	$	1,046,511		$	322,988
Derivative liabilities:
Credit derivatives	566			566			—		—			566
Interest rate swaps—asset position	(627		)	(627		)	—		(627		)	—
Interest rate swaps—liability position	81,495			81,495			—		81,495			—
Futures contracts	1,348			1,348			1,348		—			—
Liabilities for net financial guarantees written (2)	3,435,438			4,842,402			—		—			4,842,402
Variable interest entity liabilities:
Long-term debt	12,160,544			12,160,544			—		9,402,856			2,757,688
Derivative liabilities:
Interest rate swaps—liability position	2,205,264			2,205,264			—		2,205,264			—
Total financial liabilities	$	19,312,708		$	20,660,491		$	1,348	$	12,735,499		$	7,923,644

(1) Excluded from the fair value measurement categories in the table above are investment funds of $326,152 and $310,441 as of March 31, 2018 and December 31, 2017, respectively, which are measured using NAV per share as a practical expedient.

Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3

Information about the above described model inputs used to determine the fair value of credit derivatives, including the CVA as a percentage of the gross mark-to-market liability before considering Ambac credit risk (“CVA percentage”), as of March 31, 2018 and December 31, 2017 is summarized below:

	March 31, 2018				December 31, 2017
Number of CDS transactions		2			2
Notional outstanding		$	330,656		$	325,890
Weighted average reference obligation price		98.6			99.3
Weighted average life (WAL) in years		6.3			6.5
Weighted average credit rating		A			A
Weighted average relative change ratio		23.4		%	23.6		%
CVA percentage		9.25		%	9.64		%
Fair value of derivative liabilities		$	1,018		$	566

Summary of Changes in Level 3 Fair Value Category

The following tables present the changes in the Level 3 fair value category for the periods presented in 2018 and 2017. Ambac classifies financial instruments in Level 3 of the fair value hierarchy when there is reliance on at least one significant unobservable input to the valuation model. In addition to these unobservable inputs, the valuation models for Level 3 financial instruments typically also rely on a number of inputs that are readily observable either directly or indirectly. Thus, the gains and losses presented below include changes in the fair value related to both observable and unobservable inputs.

Level 3 - Financial Assets and Liabilities Accounted for at Fair Value
										VIE Assets and Liabilities
	Investments			Other Assets			Derivatives			Investments			Loans			Long-term Debt			Total
Three Months Ended March 31, 2018:
Balance, beginning of period	$	808,557		$	5,979		$	60,808		$	2,914,145		$	11,529,384		$	(2,757,688	)	$	12,561,185
Total gains/(losses) realized and unrealized:
Included in earnings	35,184			(358		)	(9,375		)	(69,026		)	(202,588		)	159,985			(86,178		)
Included in other comprehensive income	(52,508		)	—			—			110,644			423,892			(103,877		)	378,151
Purchases	—			—			—			—			—			—			—
Issuances	—			—			—			—			—			—			—
Sales	—			—			—			—			—			—			—
Settlements	(713,603		)	—			(1,525		)	—			(192,357		)	5,064			(902,421		)
Transfers into Level 3	—			—			—			—			—			—			—
Transfers out of Level 3	—			—			—			—			—			—			—
Balance, end of period	$	77,630		$	5,621		$	49,908		$	2,955,763		$	11,558,331		$	(2,696,516	)	$	11,950,737
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	—		$	(358	)	$	(9,481	)	$	(69,026	)	$	(202,588	)	$	159,985		$	(121,468	)
Three Months Ended March 31, 2017:
Balance, beginning of period	$	762,703		$	7,382		$	(100,282	)	$	2,622,566		$	10,658,963		$	(2,582,220	)	$	11,369,112
Total gains/(losses) realized and unrealized:
Included in earnings	9,819			(343		)	(2,817		)	(5,195		)	346,192			(94,407		)	253,249
Included in other comprehensive income	6,285			—			—			46,348			183,549			(46,257		)	189,925
Purchases	9,851			—			—			—			—			—			9,851
Issuances	—			—			—			—			—			—			—
Sales	(79,319		)	—			—			—			—			—			(79,319		)
Settlements	(9,793		)	—			511			—			(173,399		)	6,242			(176,439		)
Transfers into Level 3	22,078			—			—			—			—			—			22,078
Transfers out of Level 3	—			—			—			—			—			—			—
Balance, end of period	$	721,624		$	7,039		$	(102,588	)	$	2,663,719		$	11,015,305		$	(2,716,642	)	$	11,588,457
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	—		$	(343	)	$	(3,017	)	$	(5,195	)	$	346,192		$	(94,407	)	$	243,230

The tables below provide roll-forward information by class of investments and derivatives measured using significant unobservable inputs.

Level 3 - Investments by Class:
	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
	Other Asset Backed Securities			Non-Agency RMBS			Total Investments			Other Asset Backed Securities			Non-Agency RMBS			Total Investments
Balance, beginning of period	$	72,540		$	736,017		$	808,557		$	65,990		$	696,713		$	762,703
Total gains/(losses) realized and unrealized:
Included in earnings	457			34,727			35,184			353			9,466			9,819
Included in other comprehensive income	(370		)	(52,138		)	(52,508		)	(279		)	6,564			6,285
Purchases	—			—			—			—			9,851			9,851
Issuances	—			—			—			—			—			—
Sales	—			—			—			—			(79,319		)	(79,319		)
Settlements	(306		)	(713,297		)	(713,603		)	(257		)	(9,536		)	(9,793		)
Transfers into Level 3	—			—			—			—			22,078			22,078
Transfers out of Level 3	—			—			—			—			—			—
Balance, end of period	$	72,321		$	5,309		$	77,630		$	65,807		$	655,817		$	721,624
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	—		$	—		$	—		$	—		$	—		$	—

Level 3 - Derivatives by Class:
	Three Months Ended March 31, 2018									Three Months Ended March 31, 2017
	Interest Rate Swaps			Credit Derivatives			Total Derivatives			Interest Rate Swaps			Credit Derivatives			Total Derivatives
Balance, beginning of period	$	61,374		$	(566	)	$	60,808		$	(84,933	)	$	(15,349	)	$	(100,282	)
Total gains/(losses) realized and unrealized:
Included in earnings	(9,029		)	(346		)	(9,375		)	(3,869		)	1,052			(2,817		)
Included in other comprehensive income	—			—			—			—			—			—
Purchases	—			—			—			—			—			—
Issuances	—			—			—			—			—			—
Sales	—			—			—			—			—			—
Settlements	(1,419		)	(106		)	(1,525		)	710			(199		)	511
Transfers into Level 3	—			—			—			—			—			—
Transfers out of Level 3	—			—			—			—			—			—
Balance, end of period	$	50,926		$	(1,018	)	$	49,908		$	(88,092	)	$	(14,496	)	$	(102,588	)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$	(9,029	)	$	(452	)	$	(9,481	)	$	(3,869	)	$	852		$	(3,017	)

Summary of Gains and Losses (Realized and Unrealized) Relating to Level 3 Assets and Liabilities Included in Earnings

Gains and losses (realized and unrealized) relating to Level 3 assets and liabilities included in earnings for the affected periods are reported as follows:

	Net Investment Income		Realized Gains or (Losses) and Other Settlements on Credit Derivative Contracts		Unrealized Gains or (Losses) on Credit Derivative Contracts			Derivative Products Revenues (Interest Rate Swaps)			Income (Loss) on Variable Interest Entities			Other Income or (Loss)
Three Months Ended March 31, 2018:
Total gains or losses included in earnings for the period	$	35,184	$	—	$	(452	)	$	(9,029	)	$	(111,629	)	$	(358	)
Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date	—		—		(452		)	(9,029		)	(111,629		)	(358		)
Three Months Ended March 31, 2017:
Total gains or losses included in earnings for the period	$	9,819	$	199	$	853		$	(3,869	)	$	246,590		$	(343	)
Changes in unrealized gains or losses relating to the assets and liabilities still held at the reporting date	—		—		852			(3,869		)	246,590			(343		)

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Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments

The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at March 31, 2018 and December 31, 2017 were as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Non-credit Other-than temporary Impairments (1)
March 31, 2018:
Fixed income securities:
Municipal obligations	$	853,001	$	14,307	$	11,921	$	855,387	$	109
Corporate obligations (2)	1,445,586		12,216		18,809		1,438,993		—
Foreign obligations	26,425		238		268		26,395		—
U.S. government obligations	90,281		119		3,139		87,261		—
Residential mortgage-backed securities	726,998		101,218		4,920		823,296		4,854
Collateralized debt obligations	50,754		204		—		50,958		—
Other asset-backed securities	520,863		69,678		893		589,648		—
	3,713,908		197,980		39,950		3,871,938		4,963
Short-term	321,210		4		95		321,119		—
	4,035,118		197,984		40,045		4,193,057		4,963
Fixed income securities pledged as collateral:
U.S. government obligations	84,240		—		—		84,240		—
Total collateralized investments	84,240		—		—		84,240		—
Total available-for-sale investments	$	4,119,358	$	197,984	$	40,045	$	4,277,297	$	4,963
December 31, 2017:
Fixed income securities:
Municipal obligations	$	845,778	$	3,456	$	69,400	$	779,834	$	—
Corporate obligations	858,774		6,772		5,471		860,075		—
Foreign obligations	26,245		409		111		26,543		—
U.S. government obligations	86,900		261		1,753		85,408		—
Residential mortgage-backed securities	2,214,512		67,303		30,482		2,251,333		23,832
Collateralized debt obligations	50,754		283		—		51,037		—
Other asset-backed securities	531,660		66,899		617		597,942		—
	4,614,623		145,383		107,834		4,652,172		23,832
Short-term	557,476		3		209		557,270		—
	5,172,099		145,386		108,043		5,209,442		23,832
Fixed income securities pledged as collateral:
U.S. government obligations	99,719		—		—		99,719		—
Total collateralized investments	99,719		—		—		99,719		—
Total available-for-sale investments	$	5,271,818	$	145,386	$	108,043	$	5,309,161	$	23,832

(1) Represents the amount of non-credit other-than-temporary impairment losses remaining in accumulated other comprehensive income on securities that also had a credit impairment. These losses are included in gross unrealized losses as of March 31, 2018 and December 31, 2017.

Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity

The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at March 31, 2018, by contractual maturity, were as follows:

	Amortized Cost		Estimated Fair Value
Due in one year or less	$	461,954	$	461,683
Due after one year through five years	1,237,724		1,239,764
Due after five years through ten years	287,768		279,803
Due after ten years	833,297		832,145
	2,820,743		2,813,395
Residential mortgage-backed securities	726,998		823,296
Collateralized debt obligations	50,754		50,958
Other asset-backed securities	520,863		589,648
Total	$	4,119,358	$	4,277,297

Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments

The following table shows gross unrealized losses and fair values of Ambac’s available-for-sale investments, excluding VIE investments, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at March 31, 2018 and December 31, 2017:

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
March 31, 2018:
Fixed income securities:
Municipal obligations	$	495,224	$	10,775	$	30,590	$	1,146	$	525,814	$	11,921
Corporate obligations	457,056		13,566		106,696		5,243		563,752		18,809
Foreign obligations	13,806		217		1,736		51		15,542		268
U.S. government obligations	77,446		3,067		3,423		72		80,869		3,139
Residential mortgage-backed securities	13,321		531		101,462		4,389		114,783		4,920
Other asset-backed securities	34,288		123		77,184		770		111,472		893
	1,091,141		28,279		321,091		11,671		1,412,232		39,950
Short-term	120,661		95		—		—		120,661		95
Total temporarily impaired securities	$	1,211,802	$	28,374	$	321,091	$	11,671	$	1,532,893	$	40,045

	Less Than 12 Months				12 Months or More				Total
	Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss		Fair Value		Gross Unrealized Loss
December 31, 2017:
Fixed income securities:
Municipal obligations	$	667,335	$	68,578	$	32,525	$	822	$	699,860	$	69,400
Corporate obligations	292,028		3,377		87,272		2,094		379,300		5,471
Foreign obligations	8,122		81		1,700		30		9,822		111
U.S. government obligations	74,188		1,653		5,525		100		79,713		1,753
Residential mortgage-backed securities	668,524		12,524		418,617		17,958		1,087,141		30,482
Other asset-backed securities	26,655		58		88,023		559		114,678		617
	1,736,852		86,271		633,662		21,563		2,370,514		107,834
Short-term	251,926		209		—		—		251,926		209
Total temporarily impaired securities	$	1,988,778	$	86,480	$	633,662	$	21,563	$	2,622,440	$	108,043

Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments

The following table details amounts included in net realized gains (losses) and other-than-temporary impairments included in earnings for the affected periods:

	Three Months Ended March 31,
	2018			2017
Gross realized gains on securities	$	11,054		$	2,659
Gross realized losses on securities	(1,388		)	(9,471		)
Net foreign exchange (losses) gains	(4,804		)	1,916
Net realized gains (losses)	$	4,862		$	(4,896	)
Net other-than-temporary impairments (1)	$	(299	)	$	(3,942	)

(1) Other-than-temporary impairments exclude impairment amounts recorded in other comprehensive income under ASC Paragraph 320-10-65-1, which comprise non-credit related amounts on securities that are credit impaired but which management does not intend to sell and it is not more likely than not that Ambac will be required to sell before recovery of the amortized cost basis.

Summary of Roll-Forward of Ambac's Cumulative Credit Losses on Debt Securities for Which Portion of Other-than-Temporary Impairment was Recognized in Other Comprehensive Income

The following table presents a roll-forward of Ambac’s cumulative credit losses on debt securities held as of March 31, 2018 and 2017 for which a portion of an other-than-temporary impairment was recognized in other comprehensive income:

	Three Months Ended March 31,
	2018			2017
Balance, beginning of period	$	67,085		$	52,070
Additions for credit impairments recognized on:
Securities not previously impaired	226			307
Securities previously impaired	64			1,985
Reductions for credit impairments previously recognized on:
Securities that matured or were sold during the period	(23,742		)	—
Balance, end of period	$	43,633		$	54,362

Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities

The following table represents the fair value, including the value of the financial guarantee, and weighted-average underlying rating, excluding the financial guarantee, of the insured securities at March 31, 2018 and December 31, 2017, respectively: 

	Municipal Obligations		Corporate Obligations (3)		Mortgage and Asset- backed Securities		Total		Weighted Average Underlying Rating (1)
March 31, 2018:
Ambac Assurance Corporation (2)	$	785,791	$	813,720	$	1,283,502	$	2,883,013	CC
National Public Finance Guarantee Corporation	18,913		—		—		18,913		BBB-
Assured Guaranty Municipal Corporation	6,000		—		—		6,000		BBB+
Total	$	810,704	$	813,720	$	1,283,502	$	2,907,926	CC
December 31, 2017:
Ambac Assurance Corporation (2)	$	706,715	$	32,660	$	2,702,887	$	3,442,262	CC
National Public Finance Guarantee Corporation	20,733		—		—		20,733		BBB-
Assured Guaranty Municipal Corporation	5,998		—		—		5,998		BBB+
Total	$	733,446	$	32,660	$	2,702,887	$	3,468,993	CC

(1) Ratings are based on the lower of Standard & Poor’s or Moody’s rating. If unavailable, Ambac’s internal rating is used.

(2) Includes corporate obligations and asset-backed securities with a fair value of $169,943 and $170,280 at March 31, 2018 and December 31, 2017, respectively, insured by Ambac UK.

Equity Method Investments [Table Text Block]

There are no unfunded commitments applicable to any of these investments for the periods disclosed.

	Fair Value
Class of Funds	March 31, 2018		December 31, 2017		Redemption Frequency	Redemption Notice Period
Real estate properties (1)	$	34,752	$	33,154	quarterly	10 business days
Diversified hedge fund strategies (2)	56,394		53,054		semi-monthly	15 - 30 days
Interest rate products (3) (7)	142,856		136,603		daily, weekly or monthly	0 - 30 days
Illiquid investments (4)	71,366		67,787		quarterly	180 days
Insurance-linked investments (5)	23,637		22,666		quarterly	90-120 days
Equity market investments (6) (7)	54,682		53,675		daily	0 days
Total equity investments in pooled funds	$	383,687	$	366,939

(1) Investments consist of UK property to generate income and capital growth.

(2) Investments seek diversified exposure to hedge fund core strategies to produce high risk-adjusted returns, with low long-term correlation to traditional markets and with targeted volatility levels. Funds may have the right to defer redemptions under certain circumstances.

(3) This class of funds includes investments in a range of instruments including leveraged loans, CLOs, asset-backed securities and floating rate notes to generate income and capital appreciation. Funds with less frequent redemption periods limit redemptions to as little as 15% per period. Funds with a same day redemption notice period are redeemable only weekly, while funds that may be redeemed any business day have notice periods of 15-30 days.

(4) This class seeks to obtain high long-term total return through investments with low liquidity and defined term, resulting in expected capital distributions to subscribers between 2020 and 2023. Redemptions cannot occur prior to the expiration of the investment lock-up period in May 2018.

(5) This class aims to provide returns from the insurance and reinsurance markets through investments in catastrophe bonds, life insurance and other insurance linked investments. Redemption periods are quarterly, subject to 90-day notice for January/July redemption dates and 120-day notice for April/October redemption dates with redemptions greater than 3.5% during the first five years following share issuance subject to redemption fees.

(6) Investments represent a diversified exposure to global equity market returns through holdings of various regional market index funds.

(7) Interest rate products include $2,853 at March 31, 2018 and $2,823 at December 31, 2017 and equity market investments include $54,682 at March 31, 2018 and $53,675 at December 31, 2017 that have readily determinable fair values priced through pricing vendors.

Summary of Net Investment Income

Net investment income was comprised of the following for the affected periods:

	Three Months Ended March 31,
	2018			2017
Fixed income securities	$	109,351		$	74,069
Short-term investments	2,840			989
Loans	187			89
Investment expense	(1,827		)	(1,997		)
Securities available-for-sale and short-term	110,551			73,150
Other investments	(311		)	8,409
Total net investment income	$	110,240		$	81,559

Net investment income from Other investments primarily represents changes in fair value on securities classified as trading or under the fair value option plus income from Ambac's interests in an unconsolidated trust created in connection with its sale of Segregated Account junior surplus notes. The portion of net unrealized gains (losses) related to trading securities still held at the end of each period is as follows:

	Three Months Ended March 31,
	2018			2017
Net gains (losses) recognized during the period on trading securities	$	(1,579	)	$	7,211
Less: net gains (losses) recognized during the reporting period on trading securities sold during the period	1,933			1,283
Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date	$	(3,512	)	$	5,928

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Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Summary of Gross Fair Values of Individual Derivative Instruments

The following tables summarize the gross fair values of individual derivative instruments and the impact of legal rights of offset as reported in the Consolidated Balance Sheets as of March 31, 2018 and December 31, 2017:

	Gross Amounts of Recognized Assets / Liabilities		Gross Amounts Offset in the Consolidated Balance Sheet		Net Amounts of Assets/ Liabilities Presented in the Consolidated Balance Sheet		Gross Amount of Collateral Received / Pledged Not Offset in the Consolidated Balance Sheet		Net Amount
March 31, 2018:
Derivative Assets:
Interest rate swaps	$	60,198	$	2	$	60,196	$	—	$	60,196
Total non-VIE derivative assets	$	60,198	$	2	$	60,196	$	—	$	60,196
Derivative Liabilities:
Credit derivatives	$	1,018	$	—	$	1,018	$	—	$	1,018
Interest rate swaps	70,568		2		70,566		69,545		1,021
Total non-VIE derivative liabilities	$	71,586	$	2	$	71,584	$	69,545	$	2,039
Variable Interest Entities Derivative Assets:
Currency swaps	$	46,260	$	—	$	46,260	$	—	$	46,260
Total VIE derivative assets	$	46,260	$	—	$	46,260	$	—	$	46,260
Variable Interest Entities Derivative Liabilities:
Interest rate swaps	$	2,155,456	$	—	$	2,155,456	$	—	$	2,155,456
Total VIE derivative liabilities	$	2,155,456	$	—	$	2,155,456	$	—	$	2,155,456
December 31, 2017:
Derivative Assets:
Interest rate swaps	$	73,826	$	627	$	73,199	$	—	$	73,199
Total non-VIE derivative assets	$	73,826	$	627	$	73,199	$	—	$	73,199
Derivative Liabilities:
Credit derivatives	$	566	$	—	$	566	$	—	$	566
Interest rate swaps	81,495		627		80,868		79,912		956
Futures contracts	1,348		—		1,348		1,348		—
Total non-VIE derivative liabilities	$	83,409	$	627	$	82,782	$	81,260	$	1,522
Variable Interest Entities Derivative Assets:
Currency swaps	$	54,877	$	—	$	54,877	$	—	$	54,877
Total VIE derivative assets	$	54,877	$	—	$	54,877	$	—	$	54,877
Variable Interest Entities Derivative Liabilities:
Interest rate swaps	$	2,205,264	$	—	$	2,205,264	$	—	$	2,205,264
Total VIE derivative liabilities	$	2,205,264	$	—	$	2,205,264	$	—	$	2,205,264

Summary of Location and Amount of Gains and Losses of Derivative Contracts

There were no amounts held representing an obligation to return cash collateral as of March 31, 2018 and December 31, 2017.

The following tables summarize the location and amount of gains and losses of derivative contracts in the Consolidated Statements of Total Comprehensive Income (Loss) for the three months endedMarch 31, 2018 and 2017:

	Location of Gain or (Loss) Recognized in Consolidated Statements of Total Comprehensive Income (Loss)	Amount of Gain or (Loss)  Recognized in Consolidated Statement of Total  Comprehensive Income (Loss)
		Three Months Ended March 31,
		2018			2017
Non-VIEs:
Credit derivatives	Net change in fair value of credit derivatives	$	(346	)	$	1,052
Non-VIE derivatives:
Interest rate swaps	Net gains (losses) on interest rate derivatives	4,543			108
Futures contracts	Net gains (losses) on interest rate derivatives	20,994			(1,622		)
Total Non-VIE derivatives		25,537			(1,514		)
Variable Interest Entities:
Currency swaps	Income (loss) on variable interest entities	(8,617		)	(4,948		)
Interest rate swaps	Income (loss) on variable interest entities	49,809			14,496
Total Variable Interest Entities		41,192			9,548
Total derivative contracts		$	66,383		$	9,086

Summary of Gross Principal Notional Outstanding for CDS Contracts

The following table summarizes the gross principal notional outstanding for CDS contracts, by Ambac rating as of March 31, 2018 and December 31, 2017:

Ambac Rating	March 31, 2018		December 31, 2017
AAA	$	—	$	—
AA	176,631		175,765
A	—		—
BBB (1)	154,025		150,125
Below investment grade (2)	—		—
Total	$	330,656	$	325,890

(1) BBB internal ratings reflect bonds which are of medium grade credit quality with adequate capacity to pay interest and repay principal. Certain protective elements and margins may weaken under adverse economic conditions and changing circumstances. These bonds are more likely than higher rated bonds to exhibit unreliable protection levels over all cycles.

(2) Below investment grade internal ratings reflect bonds which are of speculative grade credit quality with the adequacy of future margin levels for payment of interest and repayment of principal potentially adversely affected by major ongoing uncertainties or exposure to adverse conditions.

Summary of Notional Amounts of AFS's Trading Derivative Products

As of March 31, 2018 and December 31, 2017 the notional amounts of AFS’s derivatives are as follows:

	Notional
Type of derivative	March 31, 2018		December 31, 2017
Interest rate swaps—receive-fixed/pay-variable	$	376,414	$	379,497
Interest rate swaps—pay-fixed/receive-variable	1,439,932		1,428,264
US Treasury futures contracts—short	1,805,000		1,655,000

Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]

Summary of Notional Amounts of AFS's Trading Derivative Products

The notional for VIE derivatives outstanding as of March 31, 2018 and December 31, 2017 are as follows:

	Notional
Type of VIE derivative	March 31, 2018		December 31, 2017
Interest rate swaps—receive-fixed/pay-variable	$	1,540,122	$	1,483,491
Interest rate swaps—pay-fixed/receive-variable	2,561,654		2,479,244
Currency swaps	402,231		394,541
Credit derivatives	11,865		12,100

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Major Jurisdictions

The following are the major jurisdictions in which Ambac and its subsidiaries operate and the earliest tax years subject to examination:

Jurisdiction	Tax Year
United States	2010
New York State	2013
New York City	2013
United Kingdom	2014
Italy	2013

Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets

The tax effects of temporary differences that give rise to significant portions of the deferred tax liabilities and deferred tax assets at March 31, 2018 and December 31, 2017 are presented below:

	March 31, 2018			December 31, 2017
Deferred tax liabilities:
Insurance intangible	$	174,938		$	177,864
Debentures	53,274			28,387
Unearned premiums and credit fees	50,569			51,485
Variable interest entities	23,221			22,817
Investments	19,003			28,798
Other	11,722			9,402
Total deferred tax liabilities	332,727			318,753
Deferred tax assets:
Net operating loss and capital carryforward	688,693			775,917
Loss reserves	298,888			264,624
Compensation	6,819			5,585
Other	1,819			2,140
Subtotal deferred tax assets	996,219			1,048,266
Valuation allowance	698,296			763,172
Total deferred tax assets	297,923			285,094
Net deferred tax (liability)	$	(34,804	)	$	(33,659	)

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

U.S. and foreign components of pre-tax income were as follows:

	Three Months Ended March 31,
	2018		2017
U.S.	$	297,741	$	(191,872	)
Foreign	10,568		86,012
Total	$	308,309	$	(105,860	)

Schedule of Components of Income Tax Expense (Benefit)

The components of the provision for income taxes were as follows:

	Three Months Ended March 31,
	2018			2017
Current taxes
U. S. federal	$	—		$	—
U.S. state and local	1,037			320
Foreign	(39		)	19,261
Current taxes	998			19,581
Deferred taxes
Foreign	1,607			—
Provision for income taxes	$	2,605		$	19,581

Schedule of Net Operating Loss And Tax Credit Carryovers

Pursuant to the intercompany tax sharing agreement, to the extent Ambac Assurance generates taxable income after September 30, 2011, which is offset with "Allocated NOLs" of $3,650,000, it is obligated to make payments (“Tolling Payments”), subject to certain credits, to Ambac in accordance with the following NOL usage table, where the “Applicable Percentage” is applied to the aggregate amount of federal income tax liability that would have been paid if the Allocated NOLs were not available. Pursuant to the Closing Agreement between Ambac and the Internal Revenue Service ("IRS"), the IRS will receive 12.5% of Tier C and 17.5% of Tier D payments, if made.

NOL Usage Table

NOL Usage Tier	Allocated NOLs			Applicable Percentage
A	The first	$479,000		15%
B	The next	$1,057,000	after Tier A	40%
C	The next	$1,057,000	after Tier B	10%
D	The next	$1,057,000	after Tier C	15%

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Background and Business Description - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		4 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Apr. 30, 2013	Dec. 31, 2017	May 01, 2013
Background And Basis Of Presentation [Line Items]
Entity Incorporation, Date of Incorporation	Apr. 29, 1991
Investment Warrants Expiration Date			Apr. 30, 2023
Successor [Member]
Background And Basis Of Presentation [Line Items]
Other investments	$ 419,896			$ 431,630
Gain (Loss) on Sale of Derivatives	106	$ 199
Financial Guarantee Insurance Contracts, Accelerated Premium Revenue, Amount	$ 9,392	$ 16,280
Common stock, shares authorized	130,000,000			130,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01			$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000			20,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01			$ 0.01
Common stock, shares issued					45,000,000
Warrants Distributed In Bankruptcy			5,047,138		5,047,138
Warrants issued exercise price					$ 16.67
Derivative Liability	$ 71,584			$ 82,782
Successor [Member] | Ambac UK [Member]
Background And Basis Of Presentation [Line Items]
Ambac UK Benefit Through Loss Reduction				$ 91,600

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Background and Business Description Rehabilitation Exit Support Agreement (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Feb. 12, 2018
Cancellation of Surplus Notes and Accrued Interest			$ 552,320,000
Cancellation of Surplus Notes Accrued Interest			257,200,000
SatisfactionAndDischargeOfSegregatedAccountDeferredAmounts			3,856,992,000
Gain Contingency, Unrecorded Amount	$ 1,400,000,000
Market Value of Secured Note Collateral	$ 367,816,000
Tier 2 Notes			240,000,000
Tier 2 Note Security in RMBS Litigation Settlement Proceeds			1,600,000,000
One Time Interest Payment on Surplus Notes			13,501,000
Deferred Payment Obligation [Member]
Discount Amount			0.065
Surplus Notes [Member]
Cash Payment Amount			0.40
Payment Amount in New Secured Notes			0.41
Payment Amount in Existing Surplus Notes			0.125
Ambac Assurance [Member]
Secured Notes Received by Ambac LSNI and Ambac Assurance			643,583,000
Ambac [Member] | Deferred Payment Obligation [Member]
One Dollar Outstanding			1.00
Payment Amount in New Secured Notes			0.91
Discount Amount			0.09
AFG [Member]
Secured Notes Received by Ambac LSNI and Ambac Assurance			124,881,000
Ambac [Member]
One Time Interest Payment on Surplus Notes			$ 2,618,000
5.1% Surplus Notes, General Account, Due 2020 [Member] | Ambac Assurance Corporation [Member] | Successor [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.10%	5.10%
Debt Instruments Maturity Year	2020	2020

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Background and Business Description Tier 2 Notes (Details) $ in Thousands	Feb. 12, 2018 USD ($)
Tier 2 Notes	$ 240,000
Tier 2 Note Security in RMBS Litigation Settlement Proceeds	$ 1,600,000

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Basis of Presentation and Significant Accounting Policies FX gain (loss) (Details) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Foreign Currency Transaction Gain (Loss), before Tax	$ 5,018	$ 6,465
Loss and Loss Reserves [Member]
Foreign Currency Transaction Gain (Loss), before Tax	11,016	5,827
Gain (Loss) on Investments [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(4,804)	1,916
Premiums Receivable [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(1,387)	(560)
Unrealized Gains Or (Losses) On Credit Derivative Contracts [Member]
Foreign Currency Transaction Gain (Loss), before Tax	$ (25)	$ (706)

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Basis of Presentation and Significant Accounting Policies Additional Information (Details) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative [Line Items]
Fair Value, Option, Credit Risk, Gains (Losses) on Liabilities		$ 0
Gain (Loss) on Sale of Derivatives	$ 106	$ 199
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
Derivative [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	2,900
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
Derivative [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(2,900)
Other Operating Income (Expense) [Member] | Accounting Standards Update 2017-07 [Member]
Derivative [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description		-144
Operating Expense [Member] | Accounting Standards Update 2017-07 [Member]
Derivative [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description		144
Deferred Income Tax Charge [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
Derivative [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	(590)
Deferred Income Tax Charge [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
Derivative [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 590

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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow information (Details) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Income Taxes Paid	$ 9,718	$ 8,295
Decrease in long-term debt as a result of an exchange for investment securities	0	55,426
Cash and cash equivalents	38,485	118,772	$ 623,703
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	39,619	123,777	624,681	$ 95,898
Long-term Debt [Member]
Interest Paid	100,958	20,496
Variable Interest Entity, Primary Beneficiary [Member]
Restricted cash	$ 1,134	$ 5,005	$ 978

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Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2015 USD ($)	Mar. 31, 2018 USD ($) Entity	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Entity	Sep. 30, 2017 USD ($)
Variable Interest Entities [Line Items]
Equity Method Investments		$ 36,209		$ 34,941
Number of RMBS Sold	17
Cash Received From Delaware Trust	$ 146,000
Secured Debt		65,196		73,993
Par Value of Securities Placed in Trust					$ 285,437
Fair Value of Securities Placed in Trust		256,553		346,212	$ 256,553
Securities Issued by Delaware Trust	$ 146,000
Consolidated VIE assets		14,565,123		14,500,507
Consolidated VIE liabilities		14,428,632		14,366,434
Successor [Member]
Variable Interest Entities [Line Items]
Variable Interest Entity Change in Fair Value of Assets and Liabilities		1,918	$ 3,701
Fair value of special purpose entities		5,621		5,979
variable interest entities deconsolidation gain loss		0	0
Variable Interest Entity, Measure of Activity, Income or Loss before Tax		574	3,701
Other investments		$ 419,896		431,630
Asset-Backed Securities and Utility Obligations [Member]
Variable Interest Entities [Line Items]
Weighted average life		2 years 10 months 15 days
Average rating of assets held by sponsored special purpose entities		BBB+
Sponsored Variable Interest Entities [Member]
Variable Interest Entities [Line Items]
Total principal amount of debt outstanding		$ 436,080		$ 420,600
Variable Interest Entities [Member]
Variable Interest Entities [Line Items]
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax		$ 1,344	$ 0
Consolidated Entities [Member]
Variable Interest Entities [Line Items]
Number of Newly Consolidated Variable Interest Entities		0	0
Number of DeConsolidated Variable Interest Entities		0	0	0
Number of consolidated Variable Interest Entities | Entity		11		11
Ambac UK [Member]
Variable Interest Entities [Line Items]
Number of consolidated Variable Interest Entities | Entity		8		8
Consolidated VIE assets		$ 14,247,950		$ 14,160,152
Consolidated VIE liabilities		$ 14,111,885		$ 14,026,704
Ambac Assurance [Member]
Variable Interest Entities [Line Items]
Number of consolidated Variable Interest Entities | Entity				3
London Interbank Offered Rate (LIBOR) [Member]
Variable Interest Entities [Line Items]
Interest Rate on Securities Issued by Delaware Trust	2.80%

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Special Purpose Entities, Including Variable Interest Entities - Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities (Detail) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments:
Fixed income securities	$ 4,277,297	$ 5,309,161
Variable Interest Entities [Member]
Investments:
Fixed income securities	2,955,763	2,914,145
Corporate Obligations [Member]
Investments:
Fixed income securities	$ 2,955,763	$ 2,914,145

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Special Purpose Entities, Including Variable Interest Entities - Supplemental Information about Loans Held as Assets and Long-Term Debt Associated with Consolidated Variable Interest Entities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entities [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	$ 14,428,632	$ 14,366,434
Variable Interest Entities [Member] | Successor [Member]
Variable Interest Entities [Line Items]
Loans, Estimated fair value	11,558,331	11,529,384
Long-term debt, Estimated fair value	12,270,124	12,160,544
Loans, Unpaid principal balance	8,413,664	8,168,651
Long-term debt, Unpaid principal balance	$ 9,679,441	$ 9,387,884

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Special Purpose Entities, Including Variable Interest Entities - Summary of Carrying Amount of Assets, Liabilities and Maximum Exposure to Loss of Ambac's Variable Interests in Non-Consolidated Variable Interest Entities (Detail) - Variable Interest Entity, Primary Beneficiary [Member] - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entities [Line Items]
Maximum Exposure To Loss	$ 39,387,600	$ 44,199,767
Insurance Assets	2,195,593	1,069,268
Insurance Liabilities	1,713,791	4,260,578
Derivative Liabilities	6,733	9,745
Global Structured Finance [Member]
Variable Interest Entities [Line Items]
Maximum Exposure To Loss	13,692,404	18,569,951
Insurance Assets	1,849,915	733,921
Insurance Liabilities	1,334,270	3,889,522
Derivative Liabilities	7,738	10,296
Global Public Finance [Member]
Variable Interest Entities [Line Items]
Maximum Exposure To Loss	25,695,196	25,629,816
Insurance Assets	345,678	335,347
Insurance Liabilities	379,521	371,056
Derivative Liabilities	(1,005)	(551)
Collateralized Debt Obligations [Member] | Global Structured Finance [Member]
Variable Interest Entities [Line Items]
Maximum Exposure To Loss	31,644	35,555
Insurance Assets	157	169
Insurance Liabilities	2	1
Derivative Liabilities	(13)	(15)
Residential Mortgage-Backed Securities [Member] | Global Structured Finance [Member]
Variable Interest Entities [Line Items]
Maximum Exposure To Loss	8,033,584	12,766,685
Insurance Assets	1,742,097	619,848
Insurance Liabilities	670,052	3,218,356
Other Consumer Asset-Backed [Member] | Global Structured Finance [Member]
Variable Interest Entities [Line Items]
Maximum Exposure To Loss	2,209,778	2,266,610
Insurance Assets	22,416	23,405
Insurance Liabilities	331,147	328,732
Derivative Liabilities	0	0
Other Commercial Asset-Backed [Member] | Global Structured Finance [Member]
Variable Interest Entities [Line Items]
Maximum Exposure To Loss	934,919	987,797
Insurance Assets	27,527	30,413
Insurance Liabilities	30,837	35,976
Derivative Liabilities	0	0
Other [Member] | Global Structured Finance [Member]
Variable Interest Entities [Line Items]
Maximum Exposure To Loss	2,482,479	2,513,304
Insurance Assets	57,718	60,086
Insurance Liabilities	302,232	306,457
Derivative Liabilities	$ 7,751	$ 10,311

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Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (52,239)	$ (38,990)
Other comprehensive income before reclassifications	156,659	27,718
Amounts reclassified from accumulated other comprehensive income	(2,044)	8,497
Net current period other comprehensive income	154,615	36,215
Ending Balance	99,476	(2,775)
Income Tax Expense (Benefit)	2,605	19,581
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	30,755	118,863
Other comprehensive income before reclassifications	125,159	12,500
Amounts reclassified from accumulated other comprehensive income	(2,855)	8,835
Net current period other comprehensive income	122,304	21,335
Ending Balance	153,059	140,198
Accumulated Translation Adjustment [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(93,634)	(167,220)
Other comprehensive income before reclassifications	32,056	12,593
Amounts reclassified from accumulated other comprehensive income	0	0
Net current period other comprehensive income	32,056	12,593
Ending Balance	(61,578)	(154,627)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ (2,900)
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(2,900)
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income	1,114
Net current period other comprehensive income	1,114
Ending Balance	(1,786)
Other Postretirement Benefits Plan [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	10,640	9,367
Other comprehensive income before reclassifications	(556)	2,625
Amounts reclassified from accumulated other comprehensive income	(303)	(338)
Net current period other comprehensive income	(859)	2,287
Ending Balance	9,781	11,654
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Income Tax Expense (Benefit)	1,708	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Postretirement Benefits Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(241)	(241)
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from accumulated other comprehensive income	(303)	(338)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	62	97
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(303)	(338)
Income Tax Expense (Benefit)	$ 0	$ 0

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Comprehensive Income - Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	$ (2,605)	$ (19,581)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax	1,114
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2,044)	8,497
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized investment gains	(4,563)	8,835
Net of tax and noncontrolling interest	(2,855)	8,835
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2,855)	8,835
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax	(1,114)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1,114
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, before Tax, after Reclassification Adjustment	(1,344)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax and noncontrolling interest	(2,044)	8,497
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	(1,708)	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Financial Liability, Fair Value Option, Including Portion Attributable to Noncontrolling Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	230
Other Postretirement Benefits Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(303)	(338)
Other Postretirement Benefits Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	0	0
Prior service cost	(241)	(241)
Actuarial gains (losses)	(62)	(97)
Total before tax	(303)	(338)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ (303)	$ (338)

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Net Income Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		4 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Apr. 30, 2013	Dec. 31, 2017	Nov. 02, 2016	Jun. 30, 2015	May 01, 2013
Schedule Of Earnings Per Share [Line Items]
Warrants Repurchased Average Cost per Warrant	$ 8.21
Investment Warrants Expiration Date			Apr. 30, 2023
RemainingWarrantBuyBackAuthorizedDollars	$ 11,939
Successor [Member]
Schedule Of Earnings Per Share [Line Items]
Number of new common stock issued							45,000,000
Warrants Purchased During Period Shares	0
Warrants Purchased During Period Dollars	$ 0
Par value of common stock issued	$ 0.01			$ 0.01			$ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			5,047,138				5,047,138
Exercise price of common stock							$ 16.67
Common stock shares issued	194	0
First Warrant Buyback Authorization Dollars						$ 10,000
Warrant exercised	194	0
Warrants outstanding	4,053,476
SecondWarrantBuyBackAuthorizedDollars					$ 10,000
Warrants Purchased Shares	985,331
Payments for Repurchase of Warrants	$ 8,092

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Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Detail) - Successor [Member] - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of common shares used for basic earnings per share	45,471,083	45,292,253
Effect of potential dilutive shares:
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share	45,653,471	45,292,253
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,053,476	4,053,670
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	126,667	126,667
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	94,204
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	342,456
Warrants [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	0	0
Restricted Stock Units (RSUs) [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	45,713	0
Performance Shares [Member]
Effect of potential dilutive shares:
Effect of potential dilutive shares	136,675	0

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Net Income Per Share Schedule of Basic and Dilutive Securities for EPS (Details) - Successor [Member] - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Weighted Average Number of Shares Outstanding, Basic	45,471,083	45,292,253
Weighted Average Number of Shares Outstanding, Diluted	45,653,471	45,292,253
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	94,204
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	126,667	126,667
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,053,476	4,053,670
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	342,456
Performance Shares [Member]
Weighted Average Number Diluted Shares Outstanding Adjustment	136,675	0
Restricted Stock Units (RSUs) [Member]
Weighted Average Number Diluted Shares Outstanding Adjustment	45,713	0

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Financial Guarantee Insurance Contracts - Additional Information (Detail) € in Thousands, £ in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2018 EUR (€)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 GBP (£)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)	Mar. 31, 2017 GBP (£)	Dec. 31, 2016 USD ($)
Insurance [Line Items]
Estimated Future Premium Payments Weighted Average Discounted Rate			2.50%	2.70%	2.70%	2.70%
Weighted average period of future premiums	8 years 10 months 24 days	9 years 9 months 18 days
Subrogation recoveries, net of reinsurance			$ (1,806,736)		$ (1,805,936)
Possible Increase in Loss Reserves Related to Puerto Rico	$ 1,340,000
Successor [Member]
Insurance [Line Items]
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation			1,834,387		1,833,510
Financial Guarantee Insurance Contracts, Premium Receivable			586,312		580,707			$ 652,677		$ 661,337
Reinsurance Payable			37,876		36,451
Transactions with non-investment grade internal ratings	21.00%	22.00%
Uncollectable premium receivables			9,331		8,738
Past due premiums on policies insuring non-investment grade obligations amount	$ 500
Accelerated premium revenue for retired obligations	9,392	$ 16,280
Reinsurance recoveries of losses included in losses and loss expenses	1,354	(4,112)
Losses and loss expense reserves ceded to reinsurers			40,658		38,735			34,691		$ 30,767
Intangible amortization expense	$ 28,636	$ 37,525
Intangible Assets, Gross (Excluding Goodwill)			1,581,156		1,601,066
Insurance intangible asset			846,973		833,040
Accumulated amortization on insurance intangible asset			$ 734,183		768,026
Loss Reserves [Member]
Insurance [Line Items]
Weighted average risk-free rate used to discount loss reserves	2.80%		2.50%
United Kingdom, Pounds
Insurance [Line Items]
Financial Guarantee Insurance Contracts, Premium Receivable					163,926	£ 116,815		185,204	£ 147,726
Euro Member Countries, Euro
Insurance [Line Items]
Financial Guarantee Insurance Contracts, Premium Receivable				€ 29,767	$ 36,679		€ 32,671	$ 34,908
Commonwealth of Puerto Rico [Member]
Insurance [Line Items]
Domestic Public Finance Losses	$ 11,273
Ambac UK [Member] | Successor [Member]
Insurance [Line Items]
Ballantyne Settlement with JPMIM			$ 325,600
Ambac UK Benefit Through Loss Reduction			$ 91,600

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Financial Guarantee Insurance Contracts - Summary of Gross Premium Receivable Roll-Forward (Direct and Assumed Contracts) (Detail) € in Thousands, £ in Thousands, $ in Thousands	3 Months Ended						12 Months Ended
	Mar. 31, 2018 EUR (€)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 GBP (£)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)	Mar. 31, 2017 GBP (£)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)
Successor [Member]
Insurance [Line Items]
Financial Guarantee Insurance Contracts, Accelerated Premium Revenue, Amount		$ 9,392			$ 16,280
Percentage Premiums Receivable Related To Transactions With Non Investment Grade Internal Ratings	21.00%	21.00%	21.00%	22.00%	22.00%	22.00%
Percentage of Premiums Receivable Related to Non Investment Grade Structured Finance Transactions	14.00%	14.00%	14.00%				16.00%
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward]
Beginning premium receivable		$ 586,312			$ 661,337
Premium receipts		15,381			17,978
Adjustments for changes in expected and contractual cash flows		(1,289)			1,352
Accretion of premium receivable discount		3,846			4,244
Uncollectable premiums		604			(12)
Other adjustments (including foreign exchange)		6,615			3,734
Ending premium receivable		580,707			652,677		$ 661,337
Premiums Receivable, Allowance for Doubtful Accounts		8,738						$ 9,331
Premiums Past Due On Non Investment Grade Obligation		500
United Kingdom, Pounds
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward]
Ending premium receivable		163,926	£ 116,815		185,204	£ 147,726
Euro Member Countries, Euro
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward]
Ending premium receivable	€ 29,767	$ 36,679		€ 32,671	$ 34,908

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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums Written	$ 4,261	$ 5,584
Assumed Reinsurance Premiums Written	0	0
Ceded Reinsurance Premiums Written	(819)	(1,815)
Premiums written, net of reinsurance	(5,080)	(7,399)
Direct Premiums Earned	32,609	52,065
Assumed Reinsurance Premiums Earned	19	21
Ceded Reinsurance Premiums Earned	1,745	4,473
Reinsurance on premiums earned, Net	$ 30,883	$ 47,613

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Financial Guarantee Insurance Contracts - Summarized Future Gross Undiscounted Premiums Expected to be Collected, and Future Expected Premiums Earned, Net of Reinsurance (Detail) - Successor [Member] $ in Thousands	Mar. 31, 2018 USD ($)
Future premiums expected to be collected, June 30. 2018	$ 14,957
Future premiums expected to be collected, September 30, 2018	14,771
Future premiums expected to be collected, December 31, 2018	12,947
Future premiums expected to be collected, December 31, 2019	55,142
Future premiums expected to be collected, December 31, 2020	52,344
Future premiums expected to be collected, December 31, 2021	45,913
Future premiums expected to be collected, December 31, 2022	43,923
Future premiums expected to be collected, December 31, 2027	195,614
Future premiums expected to be collected, December 31, 2032	153,584
Future premiums expected to be collected, December 31, 2037	85,689
Future premiums expected to be collected, December 31, 2042	31,028
Future premiums expected to be collected, December 31, 2047	14,425
Future premiums expected to be collected, December 31, 2052	3,620
Future premiums expected to be collected, December 31, 2057	92
Future premiums expected to be collected, Total	724,049
Future expected premiums to be earned, net of reinsurance, June 30, 2018	17,037
Future expected premiums to be earned, net of reinsurance, September 30, 2018	16,388
Future expected premiums to be earned, net of reinsurance, December 31, 2018	15,946
Future expected premiums to be earned, net of reinsurance, December 31, 2019	60,697
Future expected premiums to be earned, net of reinsurance, December 31, 2020	56,759
Future expected premiums to be earned, net of reinsurance, December 31, 2021	51,792
Future expected premiums to be earned, net of reinsurance, December 31, 2022	48,292
Future expected premiums to be earned, net of reinsurance, December 31, 2027	196,972
Future expected premiums to be earned, net of reinsurance, December 31, 2032	132,598
Future expected premiums to be earned, net of reinsurance, December 31, 2037	73,307
Future expected premiums to be earned, net of reinsurance, December 31, 2042	25,070
Future expected premiums to be earned, net of reinsurance, December 31, 2047	12,798
Future expected premiums to be earned, net of reinsurance, December 31, 2052	4,656
Future expected premiums to be earned, net of reinsurance, December 31, 2057	297
Future expected premiums to be earned, net of reinsurance, Total	$ 712,609

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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Ceded Loss And Loss Expenses Paid Not Yet Recovered	$ 90	$ (418)	$ 339
Loss Reserves Ceded To Reinsurers	38,735	34,691	40,658	$ 30,767
Policyholder Benefits and Claims Incurred, Ceded	(1,354)	4,112
Liability for Unpaid Claims and Claims Adjustment Expense, Net	205,588	$ 3,795,664	4,073,144	$ 3,665,271
Loss and loss expense reserves	2,139,101		4,745,015
Subrogation recoverable	(1,894,778)		(631,213)
Claim liability reported on Balance Sheet, before reinsurance	244,323		4,113,802
Unpaid Claims-Claims [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	0		2,411,632
Subrogation recoverable	0		615,391
Claim liability reported on Balance Sheet, before reinsurance	0		3,027,023
Unpaid Claims-Accrued Interest [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	0		667,988
Subrogation recoverable	0		171,755
Claim liability reported on Balance Sheet, before reinsurance	0		839,743
Present Value of Expected Net Cash Flows- Claims and Loss Expenses [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	2,592,778		2,855,010
Subrogation recoverable	275,425		102,171
Claim liability reported on Balance Sheet, before reinsurance	2,868,203		2,957,181
Present Value of Expected Net Cash Flows-Recoveries [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	(324,936)		(1,054,113)
Subrogation recoverable	(2,170,203)		(1,520,530)
Claim liability reported on Balance Sheet, before reinsurance	(2,495,139)		(2,574,643)
Unearned Premium Reserve [Member]
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]
Loss and loss expense reserves	(128,741)		(135,502)
Subrogation recoverable	0		0
Claim liability reported on Balance Sheet, before reinsurance	$ (128,741)		$ (135,502)

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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail) € in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018 EUR (€)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Feb. 12, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)
Successor [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Beginning gross loss and loss expense reserves		$ 4,113,802		$ 3,696,038
Less reinsurance on loss and loss expense reserves		40,658		30,767
Beginning balance of net loss and loss expense reserves		4,073,144		3,665,271
Current Year Claims and Claims Adjustment Expense		778		1,543
Prior Year Claims and Claims Adjustment Expense		(248,173)		133,468
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims		(247,395)		135,011
Claim and loss expense payments, net of subrogation and reinsurance		0		(696)
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance		(3,631,177)		(9,749)
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid		3,631,177		10,445
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss)		11,016		5,827
Liability for Unpaid Claims and Claims Adjustment Expense, Net		4,073,144		3,665,271	$ 205,588		$ 4,073,144	$ 3,795,664
Add reinsurance on loss and loss expense reserves		38,735		34,691
Ending gross loss and loss expense reserves		244,323		3,830,355
Policyholder Benefits and Claims Incurred, Ceded		(1,354)		4,112
Net Incurred RMBS Subrogation Recoveries		(800)		(13,797)
SatisfactionAndDischargeOfSegregatedAccountDeferredPrincipalAmounts						$ 3,000,158
SatisfactionAndDischargeOfSegregatedAccountDeferredInterestAmounts						856,834
Loss and Loss Expense Benefit on Settled Deferred Amounts						$ 288,204
Ceded Loss And Loss Expenses Paid Not Yet Recovered					$ 90		$ 339	$ (418)
Euro Member Countries, Euro
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Ending gross loss and loss expense reserves	€ 17,366	$ 21,398	€ 19,639	$ 20,984

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Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Detail) - Successor [Member] $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) Policies	Dec. 31, 2017 USD ($) Policies	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Loss Reserves Ceded To Reinsurers	$ 38,735	$ 40,658	$ 34,691	$ 30,767
Ceded Loss And Loss Expenses Paid Not Yet Recovered	$ 90	$ 339	$ (418)
Number of policies | Policies	250	277
Remaining weighted-average contract period (in years)	16 years	17 years
Gross insured contractual payments outstanding:
Principal	$ 10,599,933	$ 11,687,070
Interest	10,917,345	11,197,612
Total	21,517,278	22,884,682
Gross undiscounted claim liability	4,179,258	8,025,561
Discount, gross claim liability	1,398,025	1,291,005
Gross claim liability before all subrogation and before reinsurance	2,781,233	6,734,556
Less:
Gross RMBS subrogation	(1,861,894)	(1,857,502)
Discount, RMBS subrogation	28,384	23,115
Discounted RMBS subrogation, before reinsurance	(1,833,510)	(1,834,387)
Less:
Gross other subrogation	(750,538)	(827,078)
Discount, other subrogation	88,909	86,822
Discounted other subrogation, before reinsurance	(661,629)	(740,256)
Gross claim liability, net of all subrogation and discounts, before reinsurance	286,094	4,159,913
Less: Unearned premium reserves	(128,741)	(135,502)
Plus: Loss adjustment expenses reserves	86,970	89,391
Claim liability reported on Balance Sheet, before reinsurance	244,323	4,113,802
Reinsurance recoverable reported on Balance Sheet	$ 38,825	$ 40,997
I/SL [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies | Policies	25	26
Remaining weighted-average contract period (in years)	10 years	10 years
Gross insured contractual payments outstanding:
Principal	$ 967,427	$ 1,046,267
Interest	500,680	531,657
Total	1,468,107	1,577,924
Gross undiscounted claim liability	4,264	4,434
Discount, gross claim liability	514	465
Gross claim liability before all subrogation and before reinsurance	3,750	3,969
Less:
Gross RMBS subrogation	0	0
Discount, RMBS subrogation	0	0
Discounted RMBS subrogation, before reinsurance	0	0
Less:
Gross other subrogation	0	0
Discount, other subrogation	0	0
Discounted other subrogation, before reinsurance	0	0
Gross claim liability, net of all subrogation and discounts, before reinsurance	3,750	3,969
Less: Unearned premium reserves	(1,586)	(2,126)
Plus: Loss adjustment expenses reserves	16,141	16,116
Claim liability reported on Balance Sheet, before reinsurance	18,305	17,959
Reinsurance recoverable reported on Balance Sheet	$ 238	$ 202
IA [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies | Policies	26	20
Remaining weighted-average contract period (in years)	22 years	23 years
Gross insured contractual payments outstanding:
Principal	$ 576,858	$ 531,190
Interest	601,901	584,098
Total	1,178,759	1,115,288
Gross undiscounted claim liability	56,682	56,659
Discount, gross claim liability	13,866	13,095
Gross claim liability before all subrogation and before reinsurance	42,816	43,564
Less:
Gross RMBS subrogation	0	0
Discount, RMBS subrogation	0	0
Discounted RMBS subrogation, before reinsurance	0	0
Less:
Gross other subrogation	(8,604)	(7,990)
Discount, other subrogation	5,810	5,169
Discounted other subrogation, before reinsurance	(2,794)	(2,821)
Gross claim liability, net of all subrogation and discounts, before reinsurance	40,022	40,743
Less: Unearned premium reserves	(10,092)	(9,990)
Plus: Loss adjustment expenses reserves	3,082	3,242
Claim liability reported on Balance Sheet, before reinsurance	33,012	33,995
Reinsurance recoverable reported on Balance Sheet	$ 4,448	$ 4,894
II [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies | Policies	15	26
Remaining weighted-average contract period (in years)	10 years	10 years
Gross insured contractual payments outstanding:
Principal	$ 642,281	$ 1,199,909
Interest	243,259	413,045
Total	885,540	1,612,954
Gross undiscounted claim liability	59,584	77,289
Discount, gross claim liability	9,724	12,250
Gross claim liability before all subrogation and before reinsurance	49,860	65,039
Less:
Gross RMBS subrogation	0	0
Discount, RMBS subrogation	0	0
Discounted RMBS subrogation, before reinsurance	0	0
Less:
Gross other subrogation	(4)	(9,371)
Discount, other subrogation	0	2,550
Discounted other subrogation, before reinsurance	(4)	(6,821)
Gross claim liability, net of all subrogation and discounts, before reinsurance	49,856	58,218
Less: Unearned premium reserves	(9,810)	(12,238)
Plus: Loss adjustment expenses reserves	582	665
Claim liability reported on Balance Sheet, before reinsurance	40,628	46,645
Reinsurance recoverable reported on Balance Sheet	$ 8,368	$ 9,424
III [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies | Policies	23	22
Remaining weighted-average contract period (in years)	23 years	24 years
Gross insured contractual payments outstanding:
Principal	$ 2,013,845	$ 1,998,861
Interest	7,195,260	7,182,715
Total	9,209,105	9,181,576
Gross undiscounted claim liability	1,449,879	1,412,976
Discount, gross claim liability	693,598	643,897
Gross claim liability before all subrogation and before reinsurance	756,281	769,079
Less:
Gross RMBS subrogation	0	0
Discount, RMBS subrogation	0	0
Discounted RMBS subrogation, before reinsurance	0	0
Less:
Gross other subrogation	(53,703)	(53,070)
Discount, other subrogation	9,497	8,349
Discounted other subrogation, before reinsurance	(44,206)	(44,721)
Gross claim liability, net of all subrogation and discounts, before reinsurance	712,075	724,358
Less: Unearned premium reserves	(44,754)	(46,086)
Plus: Loss adjustment expenses reserves	11,146	13,331
Claim liability reported on Balance Sheet, before reinsurance	678,467	691,603
Reinsurance recoverable reported on Balance Sheet	$ 38,603	$ 38,465
IV [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies | Policies	157	179
Remaining weighted-average contract period (in years)	12 years	13 years
Gross insured contractual payments outstanding:
Principal	$ 6,350,960	$ 6,862,281
Interest	2,359,913	2,469,765
Total	8,710,873	9,332,046
Gross undiscounted claim liability	2,543,988	6,409,340
Discount, gross claim liability	675,210	616,559
Gross claim liability before all subrogation and before reinsurance	1,868,778	5,792,781
Less:
Gross RMBS subrogation	(1,861,894)	(1,857,502)
Discount, RMBS subrogation	28,384	23,115
Discounted RMBS subrogation, before reinsurance	(1,833,510)	(1,834,387)
Less:
Gross other subrogation	(675,089)	(743,456)
Discount, other subrogation	69,630	67,045
Discounted other subrogation, before reinsurance	(605,459)	(676,411)
Gross claim liability, net of all subrogation and discounts, before reinsurance	(570,191)	3,281,983
Less: Unearned premium reserves	(62,241)	(64,786)
Plus: Loss adjustment expenses reserves	56,019	56,037
Claim liability reported on Balance Sheet, before reinsurance	(576,413)	3,273,234
Reinsurance recoverable reported on Balance Sheet	$ (12,832)	$ (11,988)
V [Member]
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Number of policies | Policies	4	4
Remaining weighted-average contract period (in years)	4 years	4 years
Gross insured contractual payments outstanding:
Principal	$ 48,562	$ 48,562
Interest	16,332	16,332
Total	64,894	64,894
Gross undiscounted claim liability	64,861	64,863
Discount, gross claim liability	5,113	4,739
Gross claim liability before all subrogation and before reinsurance	59,748	60,124
Less:
Gross RMBS subrogation	0	0
Discount, RMBS subrogation	0	0
Discounted RMBS subrogation, before reinsurance	0	0
Less:
Gross other subrogation	(13,138)	(13,191)
Discount, other subrogation	3,972	3,709
Discounted other subrogation, before reinsurance	(9,166)	(9,482)
Gross claim liability, net of all subrogation and discounts, before reinsurance	50,582	50,642
Less: Unearned premium reserves	(258)	(276)
Plus: Loss adjustment expenses reserves	0	0
Claim liability reported on Balance Sheet, before reinsurance	50,324	50,366
Reinsurance recoverable reported on Balance Sheet	$ 0	$ 0

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Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Phantom) (Detail) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]
Loss Reserves Ceded To Reinsurers	$ 38,735	$ 40,658	$ 34,691	$ 30,767
Loss and loss expense reserves	2,139,101	4,745,015
Subrogation recoverable	(1,894,778)	(631,213)
Liability for Claims	244,323	4,113,802	3,830,355	$ 3,696,038
Ceded Loss And Loss Expenses Paid Not Yet Recovered	$ 90	$ 339	$ (418)

XML

Financial Guarantee Insurance Contracts - Summary of Balance of RMBS Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]
Balance Of Rmbs Subrogation Recoveries Net Of Reinsurance	$ (1,805,936)		$ (1,806,736)
Successor [Member]
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]
Subrogation recoveries	1,833,510		1,834,387
Successor [Member] | Random Samples [Member]
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]
Gross loss reserve before subrogation recoveries	171,999		1,366,483
Subrogation recoveries	1,833,510		1,834,387
Gross loss reserve after subrogation recoveries	(1,661,511)		(467,904)
Random Samples [Member] | Successor [Member]
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items]
Subrogation recoveries	1,833,510	$ 1,892,974	$ 1,834,387	$ 1,907,035
Other Changes Rmbs Subrogation	$ (877)	$ (14,061)

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Financial Guarantee Insurance Contracts - Summary of Rollforward of RMBS Subrogation, by Estimation Approach (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Subrogation By Estimation Approach [Roll Forward]
Discounted RMBS subrogation (gross of reinsurance), beginning balance	$ 1,834,387
Changes recognized
Discounted RMBS subrogation (gross of reinsurance), ending balance	1,833,510
Random Samples [Member]
Subrogation By Estimation Approach [Roll Forward]
Discounted RMBS subrogation (gross of reinsurance), beginning balance	1,834,387	$ 1,907,035
Changes recognized
Other Changes Rmbs Subrogation	(877)	(14,061)
Discounted RMBS subrogation (gross of reinsurance), ending balance	$ 1,833,510	$ 1,892,974

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Financial Guarantee Insurance Contracts - Estimated Future Amortization Expense for Insurance Intangible Asset (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Amortization Of Intangible Assets [Line Items]
Amortization of insurance intangible assets	$ 28,636	$ 37,525
Intangible Assets, Gross (Excluding Goodwill)	1,601,066		$ 1,581,156
Accumulated amortization on insurance intangible asset	768,026		734,183
2016	55,687
2017	68,517
2018	63,475
2019	57,891
2020	53,816
Thereafter	533,654
Insurance intangible asset	$ 833,040		$ 846,973

XML

Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Premiums Earned, Net, Financial Guarantee Insurance Contracts	$ 30,883	$ 47,613
United States [Member] | Reportable Geographical Components [Member]
Premiums Earned, Net, Financial Guarantee Insurance Contracts	24,718	40,621
United Kingdom [Member] | Reportable Geographical Components [Member]
Premiums Earned, Net, Financial Guarantee Insurance Contracts	4,856	5,263
Other International [Member] | Reportable Geographical Components [Member]
Premiums Earned, Net, Financial Guarantee Insurance Contracts	$ 1,309	$ 1,729

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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) - Successor [Member] - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Fixed income securities	$ 4,277,297,000	$ 5,309,161,000
Short term investments	321,119,000	557,270,000
Other investments	419,896,000	431,630,000
Other assets	5,621,000	5,979,000
Long-term Debt	2,957,732,000	991,696,000
Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Loans	11,558,331,000	11,529,384,000
Long-term Debt	12,270,124,000	12,160,544,000
Total Fair Value [Member]
Financial assets:
Cash	38,485,000	623,703,000
Loans	12,042,000	10,284,000
Other assets	5,621,000	5,979,000
Total financial assets	19,272,961,000	20,835,968,000
Long-term Debt		1,369,499,000
Financial liabilities:
Liabilities for net financial guarantees written	900,880,000		$ 4,842,402,000
Long-term debt	3,265,029,000
Total financial liabilities	18,663,073,000		20,660,491,000
Total Fair Value [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted cash	1,134,000	978,000
Loans	11,558,331,000	11,529,384,000
Financial liabilities:
Long-term debt	12,270,124,000		12,160,544,000
Reported Value Measurement [Member]
Financial assets:
Cash	38,485,000	623,703,000
Loans	10,643,000	10,358,000
Other assets	5,621,000	5,979,000
Total financial assets	19,289,386,000	20,853,695,000
Long-term Debt		1,428,680,000
Financial liabilities:
Liabilities for net financial guarantees written	(432,722,000)		3,435,438,000
Long-term debt	3,201,931,000
Total financial liabilities	17,266,373,000		19,312,708,000
Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted cash	1,134,000	978,000
Loans	11,558,331,000	11,529,384,000
Financial liabilities:
Long-term debt	12,270,124,000		12,160,544,000
Other Assets [Member] | Total Fair Value [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	60,198,000	73,199,000
Other Assets [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	60,198,000	73,199,000
Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	(2,000)
Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	46,260,000	54,877,000
Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	(2,000)
Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	46,260,000	54,877,000
Level 1 [Member]
Financial assets:
Cash	35,033,000	615,073,000
Loans	0	0
Other assets	0	0
Total financial assets	476,076,000	1,173,321,000
Long-term Debt		0
Financial liabilities:
Liabilities for net financial guarantees written	0		0
Long-term debt	0
Total financial liabilities	0		1,348,000
Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted cash	1,134,000	978,000
Loans	0	0
Financial liabilities:
Long-term debt	0		0
Level 1 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	0	0
Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	0
Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	0	0
Level 2 [Member]
Financial assets:
Cash	3,452,000	8,630,000
Loans	0	0
Other assets	0	0
Total financial assets	3,792,035,000	4,005,195,000
Long-term Debt		1,046,511,000
Financial liabilities:
Liabilities for net financial guarantees written	0		0
Long-term debt	2,651,952,000
Total financial liabilities	14,451,581,000		12,735,499,000
Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted cash	0	0
Loans	0	0
Financial liabilities:
Long-term debt	9,573,607,000		9,402,856,000
Level 2 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	9,272,000	11,825,000
Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	(2,000)
Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	46,260,000	54,877,000
Level 3 [Member]
Financial assets:
Cash	0	0
Loans	12,042,000	10,284,000
Other assets	5,621,000	5,979,000
Total financial assets	14,678,698,000	15,347,011,000
Long-term Debt		322,988,000
Financial liabilities:
Liabilities for net financial guarantees written	900,880,000		4,842,402,000
Long-term debt	613,077,000
Total financial liabilities	4,211,492,000		7,923,644,000
Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted cash	0	0
Loans	11,558,331,000	11,529,384,000
Financial liabilities:
Long-term debt	2,696,517,000		2,757,688,000
Level 3 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	50,926,000	61,374,000
Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	0
Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	0	0
Municipal Bonds [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	855,387,000	779,834,000
Municipal Bonds [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	855,387,000	779,834,000
Municipal Bonds [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Municipal Bonds [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	855,387,000	779,834,000
Municipal Bonds [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Corporate Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	1,438,993,000	860,075,000
Corporate Obligations [Member] | Total Fair Value [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	2,955,763,000	2,914,145,000
Corporate Obligations [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	1,438,993,000	860,075,000
Corporate Obligations [Member] | Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	2,955,763,000	2,914,145,000
Corporate Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	450,000	450,000
Corporate Obligations [Member] | Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	0	0
Corporate Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	1,438,543,000	859,625,000
Corporate Obligations [Member] | Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	0	0
Corporate Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Corporate Obligations [Member] | Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	2,955,763,000	2,914,145,000
Foreign Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	26,395,000	26,543,000
Foreign Obligations [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	26,395,000	26,543,000
Foreign Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	25,492,000	25,615,000
Foreign Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	903,000	928,000
Foreign Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
US Government Debt Securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	87,261,000	85,408,000
Fixed income securities, pledged as collateral	84,240,000	99,719,000
US Government Debt Securities [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	87,261,000	85,408,000
Fixed income securities, pledged as collateral	84,240,000	99,719,000
US Government Debt Securities [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	87,261,000	85,408,000
Fixed income securities, pledged as collateral	84,240,000	99,719,000
US Government Debt Securities [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	0	0
Fixed income securities, pledged as collateral	0	0
US Government Debt Securities [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Fixed income securities, pledged as collateral	0	0
Residential Mortgage-Backed Securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	823,296,000	2,251,333,000
Residential Mortgage-Backed Securities [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	823,296,000	2,251,333,000
Residential Mortgage-Backed Securities [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	817,987,000	1,515,316,000
Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	5,309,000	736,017,000
Collateralized Debt Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	50,958,000	51,037,000
Collateralized Debt Obligations [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	50,958,000	51,037,000
Collateralized Debt Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Collateralized Debt Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	50,958,000	51,037,000
Collateralized Debt Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Asset-backed Securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	589,648,000	597,942,000
Asset-backed Securities [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	589,648,000	597,942,000
Asset-backed Securities [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Asset-backed Securities [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	517,327,000	525,402,000
Asset-backed Securities [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	72,321,000	72,540,000
Short-Term [Member] | Total Fair Value [Member]
Financial assets:
Short term investments	321,119,000	557,270,000
Short-Term [Member] | Reported Value Measurement [Member]
Financial assets:
Short term investments	321,119,000	557,270,000
Short-Term [Member] | Level 1 [Member]
Financial assets:
Short term investments	269,171,000	389,299,000
Short-Term [Member] | Level 2 [Member]
Financial assets:
Short term investments	51,948,000	167,971,000
Short-Term [Member] | Level 3 [Member]
Financial assets:
Short term investments	0	0
Other [Member] | Total Fair Value [Member]
Financial assets:
Other investments	402,072,000	413,977,000
Other [Member] | Reported Value Measurement [Member]
Financial assets:
Other investments	419,896,000	431,630,000
Other [Member] | Level 1 [Member]
Financial assets:
Other investments	57,535,000	56,498,000
Other [Member] | Level 2 [Member]
Financial assets:
Other investments	0	29,750,000
Other [Member] | Level 3 [Member]
Financial assets:
Other investments	18,385,000	17,288,000
Future [Member] | Total Fair Value [Member] | Future [Member]
Financial liabilities:
Derivative liabilities			1,348,000
Future [Member] | Reported Value Measurement [Member] | Future [Member]
Financial liabilities:
Derivative liabilities			1,348,000
Future [Member] | Level 1 [Member] | Future [Member]
Financial liabilities:
Derivative liabilities			1,348,000
Future [Member] | Level 2 [Member] | Future [Member]
Financial liabilities:
Derivative liabilities			0
Future [Member] | Level 3 [Member] | Future [Member]
Financial liabilities:
Derivative liabilities			0
Interest Rate Swap [Member] | Total Fair Value [Member]
Financial liabilities:
Derivative liabilities	70,566,000
Interest Rate Swap [Member] | Total Fair Value [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	2,155,456,000
Interest Rate Swap [Member] | Reported Value Measurement [Member]
Financial liabilities:
Derivative liabilities	70,566,000
Interest Rate Swap [Member] | Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	2,155,456,000
Interest Rate Swap [Member] | Other Assets [Member] | Total Fair Value [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position			(627,000)
Interest Rate Swap [Member] | Other Assets [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position			(627,000)
Interest Rate Swap [Member] | Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities			81,495,000
Interest Rate Swap [Member] | Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities			2,205,264,000
Interest Rate Swap [Member] | Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities			81,495,000
Interest Rate Swap [Member] | Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities			2,205,264,000
Interest Rate Swap [Member] | Level 1 [Member]
Financial liabilities:
Derivative liabilities	0
Interest Rate Swap [Member] | Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	0
Interest Rate Swap [Member] | Level 1 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position			0
Interest Rate Swap [Member] | Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities			0
Interest Rate Swap [Member] | Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities			0
Interest Rate Swap [Member] | Level 2 [Member]
Financial liabilities:
Derivative liabilities	70,566,000
Interest Rate Swap [Member] | Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	2,155,456,000
Interest Rate Swap [Member] | Level 2 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position			(627,000)
Interest Rate Swap [Member] | Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities			81,495,000
Interest Rate Swap [Member] | Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities			2,205,264,000
Interest Rate Swap [Member] | Level 3 [Member]
Financial liabilities:
Derivative liabilities	0
Interest Rate Swap [Member] | Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	0
Interest Rate Swap [Member] | Level 3 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position			0
Interest Rate Swap [Member] | Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities			0
Interest Rate Swap [Member] | Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities			0
Credit Derivatives [Member] | Total Fair Value [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	1,018,000		566,000
Credit Derivatives [Member] | Reported Value Measurement [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	1,018,000		566,000
Credit Derivatives [Member] | Level 1 [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	0		0
Credit Derivatives [Member] | Level 2 [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	0		0
Credit Derivatives [Member] | Level 3 [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	1,018,000		$ 566,000
Investments Measured at NAV as a Practical Expedient [Member]
Financial assets:
Other investments	$ 326,152,000	$ 310,441,000

XML

Fair Value Measurements - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Contract	Dec. 31, 2017 USD ($)	Dec. 31, 2016
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Additional basis point fee need to receive for issuing a CDS on obligation	0.05%
Additional basis points fee increase on change of reference obligation spread	0.15%
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs	2.70%	2.50%
Minimum [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Basis point fee received for issuing a CDS on reference obligation base fee	0.20%
Credit spread of reference obligation of a base transaction	0.80%
Maximum [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Basis point fee received for issuing a CDS on reference obligation hypothetical fee	0.25%
Credit spread of reference obligation of revised transaction	1.00%
Successor [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other investments	$ 419,896	$ 431,630
Available-for-sale Securities	$ 4,277,297	$ 5,309,161
Successor [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Percentage of investment portfolio valued using dealer quotes	8.00%		6.00%
PercentageofInvestedPortfiliowhereProjectedCashFlowsConsistSolelyofDeferredAmountsandInterest		13.00%
Successor [Member] | Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Available-for-sale Securities	$ 5,309	$ 736,017
Successor [Member] | Corporate Obligations [Member] | Level 3 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Available-for-sale Securities	0	0
Successor [Member] | Collateralized Debt Obligations [Member] | Level 3 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Available-for-sale Securities	$ 0	$ 0
Successor [Member] | Minimum [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Percentage of investment portfolio valued using internal valuation models	2.00%	15.00%
Successor [Member] | Maximum [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Percentage of investment portfolio valued using external pricing services	90.00%		79.00%
Variable Interest Entity [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs	3.30%	3.10%
Variable Interest Entity, Primary Beneficiary [Member] | Successor [Member] | Corporate Obligations [Member] | Level 3 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Available-for-sale Securities	$ 2,955,763	$ 2,914,145
Credit Derivatives [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Number Of Credit Derivative Contracts On Adversely Classified Credit Listing | Contract	0

XML

Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2017	Sep. 30, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale Securities	$ 4,277,297	$ 5,309,161				$ 5,309,161
Ambac insured Re-remic [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Coupon rate	2.38%						2.05%
Fair Value Inputs Maturity	1 year 5 months 1 day					7 months 24 days
Yield	0.00%						0.00%
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	$ 11,950,737	12,561,185	$ 11,588,457	$ 11,369,112		$ 12,561,185
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	(86,178)		253,249
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	378,151		189,925
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases			9,851
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales			79,319
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	902,421		176,439
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		22,078
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(121,468)		243,230
Fair Value, Inputs, Level 3 [Member] | RMBS Cash Flows Consisting of Deferred Amounts [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale Securities	0	709,950				709,950
Fair Value, Inputs, Level 3 [Member] | RMBS priced using discounted cash flows [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale Securities	5,309
Fair Value, Inputs, Level 3 [Member] | Ambac insured Re-remic [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale Securities		26,067				26,067
Fair Value, Inputs, Level 3 [Member] | Corporate Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale Securities	0	0				0
Fair Value, Inputs, Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Corporate Obligations [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Available-for-sale Securities	2,955,763	2,914,145				2,914,145
Derivative [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	49,908	60,808	(102,588)	(100,282)		60,808
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	(9,375)		(2,817)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues		0			$ 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	1,525		(511)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three	0		0
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(9,481)		(3,017)
Credit Derivative [Member] | Derivative [Member] | Credit Derivative [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	(1,018)	(566)	(14,496)	(15,349)		(566)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	(346)		1,052
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues		0			0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	106		199
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three	0		0
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(452)		852
Interest Rate Swap [Member] | Derivative [Member] | Interest Rate Swap [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	50,926	61,374	(88,092)	(84,933)		$ 61,374
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	(9,029)		(3,869)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues		0			$ 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales		$ 0		$ 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	1,419		(710)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three	0		0
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	$ (9,029)		$ (3,869)

XML

Fair Value Measurements - Summary of Information about Described Model Inputs Used to Determine Fair Value of Each Class of Credit Derivatives (Detail) - Successor [Member] $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) Transactions $ / shares	Dec. 31, 2017 USD ($) Transactions $ / shares
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Derivative, Number of Instruments Held | Transactions	2	2
Other investments	$ 419,896	$ 431,630
Other [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notional outstanding	$ 330,656	$ 325,890
Weighted average reference obligation price | $ / shares	$ 98.6	$ 99.3
Weighted average life (WAL) in years	6 years 3 months	6 years 6 months
Weighted average credit rating	A	A
Weighted average relative change ratio	23.40%	23.60%
CVA percentage	9.25%	9.64%
Fair value of derivative liabilities	$ 1,018	$ 566
Real Estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other investments	34,752	33,154
Hedge Funds, Multi-strategy [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other investments	56,394	53,054
Interest Rate Contract [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other investments	142,856	136,603
Illiquid Investments [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other investments	$ 71,366	$ 67,787
Asset-backed Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs Coupon Rate	5.97%	5.97%
Fair Value Inputs Maturity	16 years 10 months 2 days	17 years 9 days
Fair Value Inputs Yield	0.00%	12.00%
Variable Interest Entity, Primary Beneficiary [Member] | European Transactions [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs Coupon Rate	0.37%	0.40%
Fair Value Inputs Maturity	14 years 12 months 23 days	15 years 3 months 11 days
Fair Value Inputs Yield	5.35%	4.82%

XML

Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Detail) - Fair Value, Inputs, Level 3 [Member] - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	$ 11,950,737	$ 11,588,457	$ 12,561,185	$ 11,369,112
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	(86,178)	253,249
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	378,151	189,925
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases		9,851
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales		(79,319)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(902,421)	(176,439)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0	22,078
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(121,468)	243,230
Investments [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	77,630	721,624	808,557	762,703
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	35,184	9,819
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	(52,508)	6,285
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases		9,851
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales		(79,319)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(713,603)	(9,793)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0	22,078
European ABS Transactions [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Of Consolidated Variable Interest Entity Debt Obligations Valued Using Unobservable Inputs By Asset Class			2,696,517	2,757,688
Other Assets [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	5,621	7,039	5,979	7,382
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	(358)	(343)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(358)	(343)
Derivative Financial Instruments, Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	49,908	(102,588)	60,808	(100,282)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	(9,375)	(2,817)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(1,525)	511
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(9,481)	(3,017)
Variable Interest Entity, Primary Beneficiary [Member] | Loan Origination Commitments [Member] | Loans Receivable [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	11,558,331	11,015,305	11,529,384	10,658,963
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	(202,588)	346,192
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	423,892	183,549
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(192,357)	(173,399)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(202,588)	346,192
Variable Interest Entity, Primary Beneficiary [Member] | Long-term Debt [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	(2,696,516)	(2,716,642)	(2,757,688)	(2,582,220)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	159,985	(94,407)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	(103,877)	(46,257)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	5,064	6,242
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	159,985	(94,407)
Variable Interest Entity, Primary Beneficiary [Member] | Investment Contracts [Member] | Corporate Debt Securities [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability	2,955,763	2,663,719	$ 2,914,145	$ 2,622,566
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings	(69,026)	(5,195)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	110,644	46,348
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	$ (69,026)	$ (5,195)

XML

Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016
Investment by Class [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 808,557		$ 762,703
Included in earnings	35,184		9,819
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	(52,508)		6,285
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases			9,851
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales					$ (79,319)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(713,603)		(9,793)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		22,078
Balance, end of period	77,630	$ 808,557	721,624	$ 762,703
Derivatives by Class [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	60,808		(100,282)
Included in earnings	(9,375)		(2,817)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues		0			0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(1,525)		511
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three	0		0
Balance, end of period	49,908	60,808	(102,588)	(100,282)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	9,481		3,017
Non-Agency RMBS [Member] | Investment by Class [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	736,017		696,713
Included in earnings	34,727		9,466
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	(52,138)		6,564
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases			9,851
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(713,297)		(9,536)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three			22,078
Balance, end of period	5,309	736,017	655,817	696,713
Residential Mortgage-Backed Securities [Member] | Investment by Class [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales					(79,319)
Asset-backed Securities [Member] | Investment by Class [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	72,540		65,990
Included in earnings	457		353
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	(370)		(279)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(306)		(257)
Balance, end of period	72,321	72,540	65,807	65,990
Interest Rate Swap [Member] | Interest Rate Swap [Member] | Derivatives by Class [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	61,374		(84,933)
Included in earnings	(9,029)		(3,869)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues		0			0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(1,419)		710
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three	0		0
Balance, end of period	50,926	61,374	(88,092)	(84,933)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	9,029		3,869
Credit Derivative [Member] | Credit Derivative [Member] | Derivatives by Class [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	(566)		(15,349)
Included in earnings	(346)		1,052
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Issues		0			$ 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales		0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(106)		(199)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three	0		0
Balance, end of period	(1,018)	(566)	(14,496)	(15,349)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	452		(852)
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	12,561,185		11,369,112
Included in earnings	(86,178)		253,249
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	378,151		189,925
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases			9,851
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales			(79,319)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(902,421)		(176,439)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		22,078
Balance, end of period	11,950,737	12,561,185	11,588,457	11,369,112
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	121,468		(243,230)
Level 3 [Member] | Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	808,557		762,703
Included in earnings	35,184		9,819
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	(52,508)		6,285
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases			9,851
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales			(79,319)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(713,603)		(9,793)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three	0		22,078
Balance, end of period	77,630	808,557	721,624	762,703
Level 3 [Member] | Other Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	5,979		7,382
Included in earnings	(358)		(343)
Balance, end of period	5,621	5,979	7,039	7,382
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	358		343
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	60,808		(100,282)
Included in earnings	(9,375)		(2,817)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(1,525)		511
Balance, end of period	49,908	60,808	(102,588)	(100,282)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	9,481		3,017
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Long-term Debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	(2,757,688)		(2,582,220)
Included in earnings	159,985		(94,407)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	(103,877)		(46,257)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	5,064		6,242
Balance, end of period	(2,696,516)	(2,757,688)	(2,716,642)	(2,582,220)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	(159,985)		94,407
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Loans Receivable [Member] | Loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	11,529,384		10,658,963
Included in earnings	(202,588)		346,192
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	423,892		183,549
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements	(192,357)		(173,399)
Balance, end of period	11,558,331	11,529,384	11,015,305	10,658,963
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	202,588		(346,192)
Variable Interest Entity, Primary Beneficiary [Member] | Level 3 [Member] | Corporate Debt Securities [Member] | Investments Contract [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	2,914,145		2,622,566
Included in earnings	(69,026)		(5,195)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss	110,644		46,348
Balance, end of period	2,955,763	$ 2,914,145	2,663,719	$ 2,622,566
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date	$ 69,026		$ 5,195

XML

Fair Value Measurements - Summary of Gains and Losses (Realized and Unrealized) Relating to Level 3 Assets and Liabilities Included in Earnings (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Investment Income [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings for the period	$ 35,184	$ 9,819
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	0	0
Realized Gains Or (Losses) and Other Settlements On Credit Derivative Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings for the period	0	199
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	0	0
Unrealized Gains Or (Losses) On Credit Derivative Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings for the period	(452)	853
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(452)	852
Interest Rate Swap [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings for the period	(9,029)	(3,869)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(9,029)	(3,869)
Income Loss On Variable Interest Entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings for the period	(111,629)	246,590
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	(111,629)	246,590
Other Income or (Loss) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total gains or losses included in earnings for the period	(358)	(343)
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held	$ (358)	$ (343)

XML

Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments (Detail) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 4,119,358	$ 5,271,818
Gross Unrealized Gains	197,984	145,386
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	40,045	108,043
Estimated Fair Value	4,277,297	5,309,161
Non - credit other - than - temporary Impairments	4,963	23,832
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	2,955,763	2,914,145
Short-Term [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	321,210	557,476
Gross Unrealized Gains	4	3
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	95	209
Estimated Fair Value	321,119	557,270
Non - credit other - than - temporary Impairments	0	0
Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,713,908	4,614,623
Gross Unrealized Gains	197,980	145,383
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	39,950	107,834
Estimated Fair Value	3,871,938	4,652,172
Non - credit other - than - temporary Impairments	4,963	23,832
Fixed Income Securities [Member] | Securities Pledged as Collateral [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	84,240	99,719
Gross Unrealized Gains	0	0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Estimated Fair Value	84,240	99,719
Non - credit other - than - temporary Impairments	0	0
Fixed Income Securities [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	853,001	845,778
Gross Unrealized Gains	14,307	3,456
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	11,921	69,400
Estimated Fair Value	855,387	779,834
Non - credit other - than - temporary Impairments	109	0
Fixed Income Securities [Member] | Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,445,586	858,774
Gross Unrealized Gains	12,216	6,772
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	18,809	5,471
Estimated Fair Value	1,438,993	860,075
Non - credit other - than - temporary Impairments	0	0
Fixed Income Securities [Member] | Foreign Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26,425	26,245
Gross Unrealized Gains	238	409
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	268	111
Estimated Fair Value	26,395	26,543
Non - credit other - than - temporary Impairments	0	0
Fixed Income Securities [Member] | U.S. Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	90,281	86,900
Gross Unrealized Gains	119	261
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	3,139	1,753
Estimated Fair Value	87,261	85,408
Non - credit other - than - temporary Impairments	0	0
Fixed Income Securities [Member] | U.S. Government Obligations [Member] | Securities Pledged as Collateral [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	84,240	99,719
Gross Unrealized Gains	0	0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Estimated Fair Value	84,240	99,719
Non - credit other - than - temporary Impairments	0	0
Fixed Income Securities [Member] | U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	726,998	2,214,512
Gross Unrealized Gains	101,218	67,303
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	4,920	30,482
Estimated Fair Value	823,296	2,251,333
Non - credit other - than - temporary Impairments	4,854	23,832
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	50,754	50,754
Gross Unrealized Gains	204	283
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Estimated Fair Value	50,958	51,037
Non - credit other - than - temporary Impairments	0	0
Fixed Income Securities [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	520,863	531,660
Gross Unrealized Gains	69,678	66,899
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	893	617
Estimated Fair Value	589,648	597,942
Non - credit other - than - temporary Impairments	0	0
Fixed Income Investments And Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,035,118	5,172,099
Gross Unrealized Gains	197,984	145,386
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	40,045	108,043
Estimated Fair Value	4,193,057	5,209,442
Non - credit other - than - temporary Impairments	$ 4,963	$ 23,832

XML

Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity (Detail) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Due in one year or less	$ 461,954
Amortized Cost, Due after one year through five years	1,237,724
Amortized Cost, Due after five years through ten years	287,768
Amortized Cost, Due after ten years	833,297
Amortized Cost, Total	2,820,743
Amortized Cost	4,119,358	$ 5,271,818
Estimated Fair Value, Due in one year or less	461,683
Estimated Fair Value, Due after one year through five years	1,239,764
Estimated Fair Value, Due after five years through ten years	279,803
Estimated Fair Value, Due after ten years	832,145
Estimated Fair Value due, Total	2,813,395
Fixed income securities	4,277,297	5,309,161
Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,713,908	4,614,623
Fixed income securities	3,871,938	4,652,172
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	726,998	2,214,512
Fixed income securities	823,296	2,251,333
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	50,754	50,754
Fixed income securities	50,958	51,037
Fixed Income Securities [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	520,863	531,660
Fixed income securities	$ 589,648	$ 597,942

XML

Investments - Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments (Detail) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 1,211,802	$ 1,988,778
Less than 12 Months, Gross Unrealized Loss	28,374	86,480
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	321,091	633,662
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11,671	21,563
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,532,893	2,622,440
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	40,045	108,043
Below Investment Grade Securities and Non-Rated Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Below Investment Grade Securities And Non Rated Securities Continuous Unrealized Loss Position Fair Value	694,796	1,855,694
Below Investment Grade Securities And Non Rated Securities Continuous Unrealized Loss Position Aggregate Losses	18,330	100,503
Short-Term [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	120,661	251,926
Less than 12 Months, Gross Unrealized Loss	95	209
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	120,661	251,926
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	95	209
Fixed Income Investments And Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	40,045	108,043
Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	1,091,141	1,736,852
Less than 12 Months, Gross Unrealized Loss	28,279	86,271
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	321,091	633,662
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11,671	21,563
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,412,232	2,370,514
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	39,950	107,834
Fixed Income Securities [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	495,224	667,335
Less than 12 Months, Gross Unrealized Loss	10,775	68,578
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	30,590	32,525
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,146	822
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	525,814	699,860
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	11,921	69,400
Fixed Income Securities [Member] | Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	457,056	292,028
Less than 12 Months, Gross Unrealized Loss	13,566	3,377
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	106,696	87,272
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5,243	2,094
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	563,752	379,300
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	18,809	5,471
Fixed Income Securities [Member] | U.S. Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	77,446	74,188
Less than 12 Months, Gross Unrealized Loss	3,067	1,653
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,423	5,525
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	72	100
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	80,869	79,713
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	3,139	1,753
Fixed Income Securities [Member] | U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Gross Unrealized Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	13,321	668,524
Less than 12 Months, Gross Unrealized Loss	531	12,524
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	101,462	418,617
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,389	17,958
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	114,783	1,087,141
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	4,920	30,482
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Gross Unrealized Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Fixed Income Securities [Member] | Other Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	34,288	26,655
Less than 12 Months, Gross Unrealized Loss	123	58
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	77,184	88,023
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	770	559
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	111,472	114,678
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	893	617
Fixed Income Securities [Member] | Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	13,806	8,122
Less than 12 Months, Gross Unrealized Loss	217	81
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,736	1,700
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	51	30
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	15,542	9,822
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	268	111
Securities Pledged as Collateral [Member] | Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Securities Pledged as Collateral [Member] | Fixed Income Securities [Member] | U.S. Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	$ 0	$ 0

XML

Investments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Sep. 30, 2017
Investment [Line Items]
Securities fair value	$ 5,926		$ 5,974
Fair Value of Securities Placed in Trust	256,553		346,212	$ 256,553
Successor [Member]
Investment [Line Items]
Other investments	419,896		431,630
Unrealized losses on securities	28,374		86,480
Other investments	(311)	$ 8,409
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments	40,045		108,043
Below Investment Grade Securities and Non-Rated Securities [Member] | Successor [Member]
Investment [Line Items]
Fair value of below investment grade securities and non-rated securities	694,796		1,855,694
Gross unrealized loss	18,330		100,503
Gains (losses) on securities held as of reporting date [Member] | Successor [Member]
Investment [Line Items]
Other investments	(3,512)	$ 5,928
Ambac UK [Member]
Investment [Line Items]
Asset Backed Securities Fair Value Disclosure	169,943		170,280
Interest Rate Contract [Member] | Successor [Member]
Investment [Line Items]
Other investments	142,856		136,603
Reported Value Measurement [Member] | Interest Rate Contract [Member] | Successor [Member]
Investment [Line Items]
Other investments	$ 2,853		$ 2,823

XML

Investments - Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investment [Line Items]
Gross realized gains on securities	$ 11,054	$ 2,659
Gross realized losses on securities	(1,388)	(9,471)
Foreign exchange (losses) gains	5,018	6,465
Net realized (losses) gains	4,862	(4,896)
Net other-than-temporary impairments	(299)	(3,942)
Gain (Loss) on Investments [Member]
Investment [Line Items]
Foreign exchange (losses) gains	$ (4,804)	$ 1,916

XML

Investments - Summary of Roll-Forward of Ambac's Cumulative Credit Losses on Debt Securities for Which Portion of Other-than-Temporary Impairment was Recognized in Other Comprehensive Income (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance at beginning	$ 43,633	$ 54,362	$ 67,085	$ 52,070
Additions for credit impairments recognized on:
Securities not previously impaired	226	307
Securities previously impaired	64	1,985
Reductions for credit impairments previously recognized on:
Securities that matured or were sold during the period	23,742	0
Balance at end	$ 43,633	$ 54,362	$ 67,085	$ 52,070

XML

Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Investment [Line Items]
Fair Value Of Securities Deposited With Governmental Authorities	$ 5,926	$ 5,974
Fair Value of Securities Placed in Trust	256,553	346,212	$ 256,553
Market Value of Secured Note Collateral	367,816
Successor [Member] | Cash and Securities Pledged Directly from Investment Portfolio [Member]
Investment [Line Items]
Fair Value of Cash and Securities Pledged to Derivative Counterparties	$ 107,060	$ 120,645

XML

Investments - Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities (Detail) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Standard & Poor's, AA Rating [Member] | Assured Guaranty Municipal Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	$ 6,000	$ 5,998
Standard & Poor's, A- Rating [Member] | National Public Finance Guarantee Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	18,913	20,733
Standard & Poor's, CC Rating [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors		3,468,993
Standard & Poor's, CC Rating [Member] | Ambac Assurance Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	2,883,013	3,442,262
Standard & Poor's, CCC Rating [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	2,907,926
Municipal Bonds [Member] | Standard & Poor's, AA Rating [Member] | Assured Guaranty Municipal Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	6,000	5,998
Municipal Bonds [Member] | Standard & Poor's, A- Rating [Member] | National Public Finance Guarantee Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	18,913	20,733
Municipal Bonds [Member] | Standard & Poor's, CC Rating [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors		733,446
Municipal Bonds [Member] | Standard & Poor's, CC Rating [Member] | Ambac Assurance Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	785,791	706,715
Municipal Bonds [Member] | Standard & Poor's, CCC Rating [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	810,704
Corporate Debt Securities [Member] | Standard & Poor's, AA Rating [Member] | Assured Guaranty Municipal Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	0	0
Corporate Debt Securities [Member] | Standard & Poor's, A- Rating [Member] | National Public Finance Guarantee Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	0	0
Corporate Debt Securities [Member] | Standard & Poor's, CC Rating [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors		32,660
Corporate Debt Securities [Member] | Standard & Poor's, CC Rating [Member] | Ambac Assurance Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	813,720	32,660
Corporate Debt Securities [Member] | Standard & Poor's, CCC Rating [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	813,720
Mortgage and Asset-Backed Securities [Member] | Standard & Poor's, CC Rating [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors		2,702,887
Mortgage and Asset-Backed Securities [Member] | Standard & Poor's, CC Rating [Member] | Ambac Assurance Corporation [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	1,283,502	$ 2,702,887
Mortgage and Asset-Backed Securities [Member] | Standard & Poor's, CCC Rating [Member]
Investment [Line Items]
Fair value of securities that include benefit of guarantees provided by financial guarantors	$ 1,283,502

XML

Investments - Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities (Phantom) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Ambac UK [Member]
Investment [Line Items]
Corporate and Asset Backed Securities Fair Value Disclosure	$ 169,943	$ 170,280

XML

Investments - Summary of Net Investment Income (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investment [Line Items]
Net Realized and Unrealized Gain (Loss) on Trading Securities	$ (1,579)	$ 7,211
Trading Securities, Realized Gain (Loss)	1,933	1,283
Fixed income securities	109,351	74,069
Short-term investments	2,840	989
Loans	187	89
Investment expense	(1,827)	(1,997)
Securities available-for-sale and short-term	110,551	73,150
Other investments	(311)	8,409
Total net investment income	110,240	81,559
Gains (losses) on securities held as of reporting date [Member]
Investment [Line Items]
Other investments	$ (3,512)	$ 5,928

XML

Investments Equity Investments (Details) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Other investments	$ 419,896	$ 431,630
Real Estate [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	34,752	33,154
Hedge Funds, Multi-strategy [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	56,394	53,054
Interest Rate Contract [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	142,856	136,603
Illiquid Investments [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	71,366	67,787
Insurance Linked [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	23,637	22,666
Equity [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	54,682	53,675
Equity investments in pooled funds [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	383,687	366,939
Readily determinable fair value [Member] | Interest Rate Contract [Member]
Schedule of Equity Method Investments [Line Items]
Other investments	$ 2,853	$ 2,823

XML

Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets, Derivative Assets	$ 60,198	$ 73,826
Gross Amounts of Recognized Liabilities, Derivative Liabilities	71,586	83,409
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	2	627
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	2	627
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	60,196	73,199
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	71,584	82,782
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets	0	0
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities	69,545	81,260
Net Amount, Derivative Assets	60,196	73,199
Net Amount, Derivative Liabilities	2,039	1,522
Variable Interest Entity [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets, Derivative Assets	46,260	54,877
Gross Amounts of Recognized Liabilities, Derivative Liabilities	2,155,456	2,205,264
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	0	0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	0	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	46,260	54,877
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	2,155,456	2,205,264
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets	0	0
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities	0	0
Net Amount, Derivative Assets	46,260	54,877
Net Amount, Derivative Liabilities	2,155,456	2,205,264
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets, Derivative Assets	60,198	73,826
Gross Amounts of Recognized Liabilities, Derivative Liabilities	70,568	81,495
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	2	627
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	2	627
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	60,196	73,199
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	70,566	80,868
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities	69,545	79,912
Net Amount, Derivative Assets	60,196	73,199
Net Amount, Derivative Liabilities	1,021	956
Interest Rate Swap [Member] | Variable Interest Entity [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities, Derivative Liabilities	2,155,456	2,205,264
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	2,155,456	2,205,264
Net Amount, Derivative Liabilities	2,155,456	2,205,264
Futures Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities, Derivative Liabilities			$ 1,348
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities			0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities			0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities			1,348
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities			1,348
Net Amount, Derivative Liabilities			$ 0
Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Liabilities, Derivative Liabilities	1,018	566
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	0	0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	0	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities	1,018	566
Net Amount, Derivative Liabilities	1,018	566
Currency Swaps [Member] | Variable Interest Entity [Member]
Derivatives, Fair Value [Line Items]
Gross Amounts of Recognized Assets, Derivative Assets	46,260	54,877
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities	0
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets	46,260	54,877
Net Amount, Derivative Assets	$ 46,260	$ 54,877

XML

Derivative Instruments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($) Contract	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Value of obligation to return cash collateral, recorded in "Other liabilities"	$ 0		$ 0
Net liability fair value of all derivative instruments linked to Ambac's own credit risk	69,545,000		79,912,000
Fair value of posted assets as collateral	$ 98,280,000		111,391,000
Credit Derivatives [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Number of credit derivative contracts | Contract	0
Successor [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Value of right to reclaim cash collateral and posted margin, recorded in "Other assets"			$ 20,926,000	$ 22,820,000
Gains in change in fair value of the call options	$ 66,383,000	$ 9,086,000
Gain (Loss) on Sale of Derivatives	$ 106,000	$ 199,000

XML

Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative instruments, gain (loss) recognized in income, net, Total	$ 66,383	$ 9,086
Net Change in Fair Value of Credit Derivatives [Member] | Credit Derivatives [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative instruments, gain (loss) recognized in income, net, Total	(346)	1,052
Derivative Products [Member] | Interest Rate Swap [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative instruments, gain (loss) recognized in income, net, Total	4,543	108
Derivative Products [Member] | Futures Contracts [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative instruments, gain (loss) recognized in income, net, Total	20,994	(1,622)
Derivative Products [Member] | ERROR in label resolution.
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative instruments, gain (loss) recognized in income, net, Total	25,537	(1,514)
Income Loss On Variable Interest Entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative instruments, gain (loss) recognized in income, net, Total	41,192	9,548
Income Loss On Variable Interest Entities [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative instruments, gain (loss) recognized in income, net, Total	49,809	14,496
Income Loss On Variable Interest Entities [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative instruments, gain (loss) recognized in income, net, Total	$ (8,617)	$ (4,948)

XML

Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) - Other Derivatives [Member] - Successor [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Ambac Rating
Notional outstanding	$ 330,656	$ 325,890
AAA Rating [Member]
Ambac Rating
Notional outstanding	0	0
AA Rating [Member]
Ambac Rating
Notional outstanding	176,631	175,765
A Rating [Member]
Ambac Rating
Notional outstanding	0	0
BBB Rating [Member]
Ambac Rating
Notional outstanding	154,025	150,125
Below Investment Grade Rating [Member]
Ambac Rating
Notional outstanding	$ 0	$ 0

XML

Derivative Instruments - Summarize Information by Major Category of CDS Contracts (Detail) - Transactions	Mar. 31, 2018	Dec. 31, 2017
Successor [Member]
Summary of information by major category of CDS contracts
Number of CDS transactions	2	2

XML

Derivative Instruments - Summary of Notional Amounts of AFS's Trading Derivative Products (Detail) - AFS [Member] - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Interest Rate Swap [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Derivative products, Notional Amount	$ 376,414	$ 379,497
Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Derivative products, Notional Amount	1,439,932	1,428,264
Futures Contracts [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Derivative products, Notional Amount	$ 1,805,000	$ 1,655,000

XML

Derivative Instruments - Summary of Notional for VIE Derivatives Outstanding (Detail) - Variable Interest Entity, Primary Beneficiary [Member] - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Interest Rate Swap [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Derivative products, Notional Amount	$ 1,540,122	$ 1,483,491
Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Derivative products, Notional Amount	2,561,654	2,479,244
Currency Swaps [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Derivative products, Notional Amount	402,231	394,541
Credit Derivatives [Member]
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]
Derivative products, Notional Amount	$ 11,865	$ 12,100

XML

Long-Term Debt (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2015	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Feb. 12, 2018	Dec. 31, 2016	May 01, 2013	May 19, 2011
Debt Instrument [Line Items]
Tier 2 Note Security in RMBS Litigation Settlement Proceeds					$ 1,600,000
Secured Debt		$ 65,196		$ 73,993
One Time Interest Payment on Surplus Notes					13,501
Junior surplus note of Ambac Assurance Segregated Account							$ 350,000
5.1% Junior Surplus Notes, General Account Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		19.50%
Debt Instrument, Face Amount		$ 369,315		370,237
Ambac Note Post Exit From Rehabilitation [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		7.60%
Debt Instrument, Face Amount		$ 2,154,351
Tier 2 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.50%
Tier 2 Note Security in RMBS Litigation Settlement Proceeds		$ 1,600,000
Debt Instrument, Interest Rate, Effective Percentage		9.90%
Paid-in-Kind Interest		$ 2,777
Debt Instrument, Face Amount		242,777
Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 65,196		73,993
5.1% Surplus Notes, General Account, Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		10.50%
Debt Instrument Principal Amount Subject To Repurchase					463,624
Debt Instrument, Face Amount		$ 291,187		754,811
One State Street [Member] | 5.1% Junior Surplus Notes, General Account Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument Principal Amount Subject To Repurchase								$ 13,056
Debt Instrument, Face Amount		19,315		20,237
Extinguishment of Debt, Amount		$ 922	$ 977
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] | 5.1% Junior Surplus Notes, Segregated Account Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		8.40%
Successor [Member]
Debt Instrument [Line Items]
Long-term debt		$ 2,957,732		991,696
Net realized gains (losses) on extinguishment of debt		3,115	$ 2,741
Successor [Member] | Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Long-term debt		2,957,732		991,696
Secured Debt		65,196		73,993
Successor [Member] | Ambac Assurance Corporation [Member] | 5.1% Junior Surplus Notes, General Account Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt		249,226		249,036
Successor [Member] | Ambac Assurance Corporation [Member] | Ambac Note Post Exit From Rehabilitation [Member]
Debt Instrument [Line Items]
Long-term debt		2,148,369		0
Successor [Member] | Ambac Assurance Corporation [Member] | Tier 2 Notes [Member]
Debt Instrument [Line Items]
Long-term debt		233,948		0
Successor [Member] | Ambac Assurance Corporation [Member] | 5.1% Surplus Notes, General Account, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt		$ 260,993		668,667
Successor [Member] | Variable Interest Entity [Member]
Debt Instrument [Line Items]
Long-term debt				$ 12,160,544
Successor [Member] | 5.1% Junior Surplus Notes, General Account Due 2020 [Member] | Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.10%
Debt Instruments Maturity Year				2020
Successor [Member] | 5.1% Surplus Notes, General Account, Due 2020 [Member] | Ambac Assurance Corporation [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.10%		5.10%
Debt Instruments Maturity Year		2020		2020
Consolidated Variable Interest Entities [Member]
Debt Instrument [Line Items]
Unpaid Principal Amount Of Fixed Rate Debt Accounted For Under Fair Value Option		$ 9,679,441				$ 9,387,884
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		295,651
Long-term Debt, Maturities, Repayments of Principal in Year Two		44,100
Long-term Debt, Maturities, Repayments of Principal in Year Three		94,024
Long-term Debt, Maturities, Repayments of Principal in Year Four		0
Long-term Debt, Maturities, Repayments of Principal in Year Five		$ 0
Consolidated Variable Interest Entities [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		1.04%		0.96%
Consolidated Variable Interest Entities [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		8.35%		8.35%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest Rate on Ambac Note Post Exit From Rehabilitation		5.00%
Interest Rate on Securities Issued by Delaware Trust	2.80%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate on Ambac Note Post Exit From Rehabilitation		1.00%
Ambac [Member]
Debt Instrument [Line Items]
One Time Interest Payment on Surplus Notes					$ 2,618

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Long-Term Debt VIE Long-term debt (Details) - Consolidated Variable Interest Entities [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Unpaid Principal Amount Of Fixed Rate Debt Accounted For Under Fair Value Option	$ 9,679,441		$ 9,387,884
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	295,651
Long-term Debt, Maturities, Repayments of Principal in Year Two	44,100
Long-term Debt, Maturities, Repayments of Principal in Year Three	94,024
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 0
Minimum [Member]
Debt Instrument, Interest Rate, Effective Percentage	1.04%	0.96%
Maximum [Member]
Debt Instrument, Interest Rate, Effective Percentage	8.35%	8.35%

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Sep. 30, 2011
Tax Credit Carryforward [Line Items]
NOL allocated amount		$ 3,650,000
AFG [Member]
Tax Credit Carryforward [Line Items]
NOL allocated amount	$ 1,403,518
Percentage Of Notional Federal Tax Liability		50.00%
U. S. Federal Net Operating Tax [Member]
Tax Credit Carryforward [Line Items]
NOL allocated amount	$ 3,279,491
Minimum [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2029
Maximum [Member]
Tax Credit Carryforward [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2032

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Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) - Successor [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Deferred tax liabilities:
Insurance intangible	$ 174,938	$ 177,864
Deferred Tax Liabilities, Debentures	53,274	28,387
Variable interest entities	23,221	22,817
Investments	19,003	28,798
Unearned premiums and credit fees	50,569	51,485
Other	11,722	9,402
Deferred Tax Liabilities, Gross, Noncurrent	332,727	318,753
Deferred tax assets:
Net operating loss and capital carryforward	688,693	775,917
Loss reserves	298,888	264,624
Other	1,819	2,140
Sub total deferred tax assets	996,219	1,048,266
Valuation allowance	698,296	763,172
Total deferred tax assets	297,923	285,094
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	6,819	5,585
Deferred Tax Assets, Net	$ (34,804)	$ (33,659)

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Income Taxes Income Taxes - Provision for Income Taxes Charged To Income From Continuing Operations (Details) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Provision for Income Taxes [Line Items]
Current Federal Tax Expense (Benefit)	$ 0	$ 0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	297,741	(191,872)
Current Income Tax Expense (Benefit)	998	19,581
Deferred Income Tax Expense (Benefit)	1,607	0
Income Tax Expense (Benefit)	2,605	19,581
Income (Loss) from Continuing Operations before Income Taxes, Foreign	10,568	86,012
Pre-tax income (loss)	308,309	(105,860)
Current State and Local Tax Expense (Benefit)	1,037	320
Current Foreign Tax Expense (Benefit)	$ (39)	$ 19,261

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Income Taxes Income Taxes - NOL Usage Table (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2011	Dec. 31, 2017
Net Income Loss Reconciliation [Line Items]
Tolling Payment Payable to AFG	$ 14,129
NOL allocated amount		$ 3,650,000
Tier C Credit	(5,000)
AAC Remaining Taxable Income From Tier C to Absorb Credit	69
Ambac Assurance [Member]
Net Income Loss Reconciliation [Line Items]
Percentage Of Notional Federal Tax Liability		25.00%
NOL allocated amount	1,875,973
AACNetTaxableIncomeFromTierB			$ (406,232)
AAC Remaining Taxable Income From Tier B	168,205
AAC Net Taxable Income From Tier C	238,026
AFG [Member]
Net Income Loss Reconciliation [Line Items]
Percentage Of Notional Federal Tax Liability		50.00%
NOL allocated amount	1,403,518
Tier A [Member]
Net Income Loss Reconciliation [Line Items]
NOL allocated amount		$ 479,000
NOL applicable percentage		15.00%
Tier B [Member]
Net Income Loss Reconciliation [Line Items]
NOL allocated amount		$ 1,057,000
NOL applicable percentage		40.00%
Tier C [Member]
Net Income Loss Reconciliation [Line Items]
NOL allocated amount		$ 1,057,000
NOL applicable percentage		10.00%
Tier D [Member]
Net Income Loss Reconciliation [Line Items]
NOL allocated amount		$ 1,057,000
NOL applicable percentage		15.00%
Domestic Tax Authority [Member]
Net Income Loss Reconciliation [Line Items]
NOL allocated amount	$ 3,279,491
Minimum [Member]
Net Income Loss Reconciliation [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2029
Maximum [Member]
Net Income Loss Reconciliation [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2032

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Income Taxes Schedule of Income Before Income Taxes (Details) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule of Income Before Income Tax, Domestic and Foreign [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 297,741	$ (191,872)
Income (Loss) from Continuing Operations before Income Taxes, Foreign	10,568	86,012
Pre-tax income (loss)	$ 308,309	$ (105,860)

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Commitments and Contingencies - Additional Information (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 1,400,000