10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended March 31, 2024

or

☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from                 to

Commission File Number:       001-09463

RLI Corp.

(Exact name of registrant as specified in its charter)

Delaware	37-0889946
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)
9025 North Lindbergh Drive, Peoria, IL	61615
(Address of principal executive offices)	(Zip Code)

(309) 692-1000

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock $0.01 par value	RLI	New York Stock Exchange

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 ☒    No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files).  Yes ☒    No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒	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 ☒

APPLICABLE ONLY TO CORPORATE ISSUERS:

As of April 16, 2024, the number of shares outstanding of the registrant’s Common Stock was 45,709,881.

Table of Contents

		Page
Part I - Financial Information		3
Item 1.	Financial Statements	3
	Condensed Consolidated Statements of Earnings and Comprehensive Earnings for the Three-Month Periods Ended March 31, 2024 and 2023 (unaudited)	3
	Condensed Consolidated Balance Sheets as of March 31, 2024 and December 31, 2023 (unaudited)	4
	Condensed Consolidated Statements of Shareholders’ Equity for the Three-Month Periods Ended March 31, 2024 and 2023 (unaudited)	5
	Condensed Consolidated Statements of Cash Flows for the Three-Month Periods Ended March 31, 2024 and 2023 (unaudited)	6
	Notes to Unaudited Condensed Consolidated Interim Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	22
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	31
Item 4.	Controls and Procedures	31
Part II - Other Information		32
Item 1.	Legal Proceedings	32
Item 1a.	Risk Factors	32
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	32
Item 3.	Defaults upon Senior Securities	32
Item 4.	Mine Safety Disclosures	32
Item 5.	Other Information	32
Item 6.	Exhibits	32
Signatures		33

PART I - FINANCIAL INFORMATION

Item 1.Financial Statements

RLI Corp. and Subsidiaries

Condensed Consolidated Statements of Earnings and Comprehensive Earnings

(Unaudited)

	For the Three Months
	Ended March 31,
(in thousands, except per share data)	2024		2023
Net premiums earned	$	360,676	$	307,723
Net investment income		32,847		27,084
Net realized gains		5,994		14,620
Net unrealized gains on equity securities		45,314		15,496
Consolidated revenue	$	444,831	$	364,923
Losses and settlement expenses		143,824		114,488
Policy acquisition costs		110,454		101,444
Insurance operating expenses		28,703		23,901
Interest expense on debt		1,618		2,008
General corporate expenses		5,010		4,214
Total expenses	$	289,609	$	246,055
Equity in earnings of unconsolidated investees		4,769		3,923
Earnings before income taxes	$	159,991	$	122,791
Income tax expense		32,091		23,980
Net earnings	$	127,900	$	98,811
Other comprehensive earnings (loss), net of tax		(12,671)		37,707
Comprehensive earnings	$	115,229	$	136,518
Basic net earnings per share	$	2.80	$	2.17
Diluted net earnings per share	$	2.77	$	2.15
Weighted average number of common shares outstanding:
Basic		45,684		45,530
Diluted		46,163		46,035

See accompanying notes to the unaudited condensed consolidated interim financial statements.

3

RLI Corp. and Subsidiaries

Condensed Consolidated Balance Sheets

(Unaudited)

	March 31,		December 31,
(in thousands, except share and per share data)	2024		2023
ASSETS
Investments and cash:
Fixed income:
Available-for-sale, at fair value	$	2,863,321	$	2,855,849
(amortized cost of $3,082,273 and allowance for credit losses of $237 at 3/31/24)
(amortized cost of $3,054,391 and allowance for credit losses of $306 at 12/31/23)
Equity securities, at fair value (cost - $362,527 at 3/31/24 and $354,022 at 12/31/23)		643,367		590,041
Short-term investments, at cost which approximates fair value		147,186		134,923
Other invested assets		59,273		59,081
Cash		44,557		36,424
Total investments and cash	$	3,757,704	$	3,676,318
Accrued investment income		25,353		24,062
Premiums and reinsurance balances receivable, net of allowances for uncollectible amounts of $21,699 at 3/31/24 and $21,438 at 12/31/23		230,537		221,206
Ceded unearned premium		107,822		112,257
Reinsurance balances recoverable on unpaid losses and settlement expenses, net of allowances for uncollectible amounts of $11,085 at 3/31/24 and $10,608 at 12/31/23		814,676		757,349
Deferred policy acquisition costs		152,924		146,566
Property and equipment, at cost, net of accumulated depreciation of $75,558 at 3/31/24 and $74,279 at 12/31/23		46,536		46,715
Investment in unconsolidated investees		66,134		56,966
Goodwill and intangibles		53,562		53,562
Income taxes-deferred		10,700		15,872
Other assets		72,461		69,348
TOTAL ASSETS	$	5,338,409	$	5,180,221
LIABILITIES AND SHAREHOLDERS’ EQUITY
Liabilities
Unpaid losses and settlement expenses	$	2,532,190	$	2,446,025
Unearned premiums		904,848		892,326
Reinsurance balances payable		35,157		71,507
Funds held		106,430		101,446
Income taxes-current		25,455		3,757
Debt		100,000		100,000
Accrued expenses		68,216		108,880
Other liabilities		45,361		42,766
TOTAL LIABILITIES	$	3,817,657	$	3,766,707
Shareholders’ Equity
Common stock ($0.01 par value)
(Shares authorized - 200,000,000)
(68,640,095 shares issued, 45,709,881 shares outstanding at 3/31/24)
(68,570,261 shares issued, 45,640,047 shares outstanding at 12/31/23)	$	687	$	686
Paid-in capital		366,701		362,345
Accumulated other comprehensive earnings (loss)		(178,974)		(166,303)
Retained earnings		1,725,337		1,609,785
Deferred compensation		12,749		13,539
Less: Treasury shares, at cost (22,930,214 shares at 3/31/24 and 12/31/23)		(405,748)		(406,538)
TOTAL SHAREHOLDERS’ EQUITY	$	1,520,752	$	1,413,514
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	5,338,409	$	5,180,221

See accompanying notes to the unaudited condensed consolidated interim financial statements.

4

RLI Corp. and Subsidiaries

Condensed Consolidated Statements of Shareholders’ Equity

(Unaudited)

									Accumulated
									Other
			Total						Comprehensive						Treasury
	Common		Shareholders’		Common		Paid-in		Earnings		Retained		Deferred		Shares
(in thousands, except share and per share data)	Shares		Equity		Stock		Capital		(Loss)		Earnings		Compensation		at Cost
Balance, January 1, 2023		45,469,752	$	1,177,341	$	684	$	352,391	$	(229,076)	$	1,446,341	$	12,015	$	(405,014)
Cumulative-effect adjustment from ASU 2023-02		—		(951)		—		—		—		(951)		—
Net earnings		—		98,811		—		—		—		98,811		—		—
Other comprehensive earnings (loss), net of tax		—		37,707		—		—		37,707		—		—		—
Deferred compensation		—		—		—		—		—		—		249		(249)
Share-based compensation		84,944		2,864		1		2,863		—		—		—		—
Dividends and dividend equivalents ($0.26 per share)		—		(11,851)		—		—		—		(11,851)		—		—
Balance, March 31, 2023		45,554,696	$	1,303,921	$	685	$	355,254	$	(191,369)	$	1,532,350	$	12,264	$	(405,263)
									Accumulated
									Other
			Total						Comprehensive						Treasury
	Common		Shareholders’		Common		Paid-in		Earnings		Retained		Deferred		Shares
(in thousands, except share and per share data)	Shares		Equity		Stock		Capital		(Loss)		Earnings		Compensation		at Cost
Balance, January 1, 2024		45,640,047	$	1,413,514	$	686	$	362,345	$	(166,303)	$	1,609,785	$	13,539	$	(406,538)
Net earnings		—		127,900		—		—		—		127,900		—		—
Other comprehensive earnings (loss), net of tax		—		(12,671)		—		—		(12,671)		—		—		—
Deferred compensation		—		—		—		—		—		—		(790)		790
Share-based compensation		69,834		4,357		1		4,356		—		—		—		—
Dividends and dividend equivalents ($0.27 per share)		—		(12,348)		—		—		—		(12,348)		—		—
Balance, March 31, 2024		45,709,881	$	1,520,752	$	687	$	366,701	$	(178,974)	$	1,725,337	$	12,749	$	(405,748)

See accompanying notes to the unaudited condensed consolidated interim financial statements.

5

RLI Corp. and Subsidiaries

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	For the Three Months
	Ended March 31,
(in thousands)	2024		2023
Net cash provided by operating activities	$	70,946	$	69,219
Cash Flows from Investing Activities
Purchase of:
Fixed income securities, available-for-sale	$	(120,109)	$	(180,040)
Equity securities		(17,302)		(6,395)
Property and equipment		(1,089)		(1,277)
Other		(2,664)		(1,392)
Proceeds from sale of:
Fixed income securities, available-for-sale		11,819		3,064
Equity securities		15,910		3,501
Equity method investments		—		14,134
Other		1,350		271
Proceeds from call or maturity of:
Fixed income securities, available-for-sale		71,284		190,303
Net proceeds from sale (purchase) of short-term investments		(12,263)		(79,973)
Net cash used in investing activities	$	(53,064)	$	(57,804)
Cash Flows from Financing Activities
Cash dividends paid	$	(12,337)	$	(11,839)
Proceeds from stock option exercises		2,588		375
Net cash used in financing activities	$	(9,749)	$	(11,464)
Net increase (decrease) in cash	$	8,133	$	(49)
Cash at the beginning of the period		36,424		22,818
Cash at March 31,	$	44,557	$	22,769

See accompanying notes to the unaudited condensed consolidated interim financial statements.

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NOTES TO UNAUDITED CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A. BASIS OF PRESENTATION

The unaudited condensed consolidated interim financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (GAAP) for interim financial reporting and with the instructions to Form 10-Q and Regulation S-X. Accordingly, they do not include all the disclosures required by GAAP for complete financial statements. As such, these unaudited condensed consolidated interim financial statements should be read in conjunction with our 2023 Annual Report on Form 10-K. Management believes that the disclosures are adequate to make the information presented not misleading, and all normal and recurring adjustments necessary to present fairly the financial position at March 31, 2024 and the results of operations of RLI Corp. (the Company) and subsidiaries for all periods presented have been made. The results of operations for any interim period are not necessarily indicative of the operating results for a full year.

The preparation of the unaudited condensed consolidated interim financial statements requires management to make estimates and assumptions relating to the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated interim financial statements and the reported amounts of revenue and expenses during the period. These estimates are inherently subject to change and actual results could differ significantly from these estimates.

B. ADOPTED ACCOUNTING STANDARDS

No new accounting standards applicable in 2024 materially impact our financial statements.

C. PROSPECTIVE ACCOUNTING STANDARDS

2023-07—Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures

The guidance in ASU 2023-07 was designed to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Although the Company continues to evaluate the impact of adopting this new accounting standard, the amendments are disclosure-related and should not have a material impact on our financial statements.

2023-09—Income Taxes (Topic 740): Improvements to Income Tax Disclosures

The guidance in ASU 2023-09 was designed to increase transparency about income tax information through improvements to the rate reconciliation and disclosure of income taxes paid. This ASU is effective for fiscal years beginning after December 15, 2024. Although the Company continues to evaluate the impact of adopting this new accounting standard, the amendments are disclosure-related and should not have a material impact on our financial statements.

D. REINSURANCE

Ceded unearned premiums and reinsurance balances recoverable on unpaid losses and settlement expenses are reported separately as an asset, rather than being netted with the related liability, since reinsurance does not relieve the Company of our liability to policyholders. Such balances are subject to the credit risk associated with the individual reinsurer. We continually monitor the financial condition of our reinsurers and actively follow up on any past due or disputed amounts. As part of our monitoring efforts, we review reinsurers’ annual financial statements and Securities and Exchange Commission filings for those that are publicly traded. We also review insurance industry developments that may impact the financial condition of our reinsurers. We analyze the credit risk associated with our reinsurance balances recoverable by monitoring the AM Best and Standard & Poor’s (S&P) ratings of our reinsurers. In addition, we subject our reinsurance balances recoverable to detailed recoverability tests, including a segment-based analysis using the average default rating percentage by S&P rating, which assists the Company in assessing the sufficiency of its allowance. Additionally, we perform an in-depth reinsurer financial condition analysis prior to the renewal of our reinsurance placements.

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Our policy is to charge to earnings, in the form of an allowance, an estimate of unrecoverable amounts from reinsurers. This allowance is reviewed on an ongoing basis to ensure that the amount makes a reasonable provision for reinsurance balances that we may be unable to recover. Once regulatory action (such as receivership, finding of insolvency, order of conservation or order of liquidation) is taken against a reinsurer, the paid and unpaid recoverable balances for the reinsurer are specifically identified and written off through use of our allowance for estimated unrecoverable amounts from reinsurers. When we write-off such a balance, it is done in full. We then re-evaluate the overall allowance and determine whether the balance is sufficient and, if needed, an additional allowance is recognized.

The allowances for uncollectible amounts on paid and unpaid reinsurance balances recoverable were $16 million and $11 million, respectively, at March 31, 2024 and December 31, 2023. Changes in the allowances were due to changes in the amount of reinsurance balances outstanding, the composition of reinsurers from whom the balances were recoverable and their associated S&P default ratings. No write-offs were applied to the allowances in the first three months of 2024 and less than $1 million was recovered.

E. INTANGIBLE ASSETS

The composition of goodwill and intangible assets at March 31, 2024 and December 31, 2023 is detailed in the following table:

	March 31,		December 31,
(in thousands)	2024		2023
Goodwill
Surety	$	40,816	$	40,816
Casualty		5,246		5,246
Total goodwill	$	46,062	$	46,062
Indefinite-lived intangibles		7,500		7,500
Total goodwill and intangibles	$	53,562	$	53,562

Annual impairment assessments were performed on our goodwill and state insurance license indefinite-lived intangible assets during the second quarter of 2023. Based upon these reviews, none of the assets were impaired. In addition, there were no triggering events as of March 31, 2024 that would suggest an updated impairment test would be needed for our goodwill and intangible assets.

F. EARNINGS PER SHARE

Basic earnings per share (EPS) is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the dilution that could occur if securities or other contracts to issue common stock or common stock equivalents were exercised or converted into common stock. When inclusion of these items increases the earnings per share or reduces the loss per share, the effect on earnings is anti-dilutive. Under these circumstances, the diluted net earnings or net loss per share is computed excluding these items. The following represents a reconciliation of the numerator and denominator of the basic and diluted EPS computations contained in the unaudited condensed consolidated interim financial statements:

	For the Three Months						For the Three Months
	Ended March 31, 2024						Ended March 31, 2023
	Income		Shares		Per Share		Income		Shares		Per Share
(in thousands, except per share data)	(Numerator)		(Denominator)		Amount		(Numerator)		(Denominator)		Amount
Basic EPS
Earnings available to common shareholders	$	127,900		45,684	$	2.80	$	98,811		45,530	$	2.17
Effect of Dilutive Securities
Stock options and restricted stock units		—		479				—		505
Diluted EPS
Earnings available to common shareholders	$	127,900		46,163	$	2.77	$	98,811		46,035	$	2.15
Anti-dilutive securities excluded from diluted EPS				—						—

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G. COMPREHENSIVE EARNINGS

Our comprehensive earnings include net earnings plus after-tax unrealized gains and losses on our available-for-sale fixed income portfolio. In reporting the components of comprehensive earnings, we used the federal statutory tax rate of 21 percent. Other comprehensive earnings (loss), as shown in the consolidated statements of earnings and comprehensive earnings, is net of tax benefit of $3 million for the first quarter of 2024, compared to $10 million of tax expense for the same period in 2023.

Unrealized losses, net of tax, recognized in other comprehensive earnings (loss) were $13 million for the first three months of 2024, compared to $38 million of unrealized gains, net of tax, during the same period last year. The unrealized losses in the first quarter of 2024 were attributable to an increase in interest rates, which decreased the fair value of securities held in the fixed income portfolio, compared to declining interest rates during the first quarter of 2023, which increased the fair value of fixed income securities.

The following table illustrates the changes in the balance of each component of accumulated other comprehensive earnings (loss) for each period presented in the unaudited condensed consolidated interim financial statements:

(in thousands)	For the Three Months
	Ended March 31,
Unrealized Gains/Losses on Available-for-Sale Securities	2024		2023
Beginning balance	$	(166,303)	$	(229,076)
Other comprehensive earnings (loss) before reclassifications		(13,275)		36,254
Amounts reclassified from accumulated other comprehensive earnings		604		1,453
Net current-period other comprehensive earnings (loss)	$	(12,671)	$	37,707
Ending balance	$	(178,974)	$	(191,369)
Balance of securities for which an allowance for credit losses has been recognized in net earnings	$	904	$	1,841

Credit losses on or the sale of an available-for-sale security results in amounts being reclassified from accumulated other comprehensive earnings (loss) to current period net earnings. The effects of reclassifications out of accumulated other comprehensive earnings (loss) by the respective line items of net earnings are presented in the following table:

	Amount Reclassified from Accumulated Other
(in thousands)	Comprehensive Earnings (Loss)
	For the Three Months
Component of Accumulated	Ended March 31,				Affected line item in the
Other Comprehensive Earnings (Loss)	2024		2023		Statement of Earnings
Unrealized gains and losses on available-for-sale securities	$	(834)	$	(1,713)	Net realized gains (losses)
		70		(126)	Credit gains (losses) presented within net realized gains
	$	(764)	$	(1,839)	Earnings (loss) before income taxes
		160		386	Income tax (expense) benefit
	$	(604)	$	(1,453)	Net earnings (loss)

H. FAIR VALUE MEASUREMENTS

Fair value is defined as the price in the principal market that would be received for an asset to facilitate an orderly transaction between market participants on the measurement date. We determined the fair value of certain financial instruments based on their underlying characteristics and relevant transactions in the marketplace. We maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.

The following are the levels of the fair value hierarchy and a brief description of the type of valuation inputs that are used to establish each level. Financial assets are classified based upon the lowest level of significant input that is used to determine fair value.

Level 1 is applied to valuations based on readily available, unadjusted quoted prices in active markets for identical assets.

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Level 2 is applied to valuations based upon quoted prices for similar assets in active markets, quoted prices for identical or similar assets in inactive markets; or valuations based on models where the significant inputs are observable (e.g. interest rates, yield curves, prepayment speeds, default rates, loss severities) or can be corroborated by observable market data.

Level 3 is applied to valuations that are derived from techniques in which one or more of the significant inputs are unobservable.

As a part of management’s process to determine fair value, we utilize widely recognized, third-party pricing sources to determine our fair values. We have obtained an understanding of the third-party pricing sources’ valuation methodologies and inputs. The following is a description of the valuation techniques used for financial assets that are measured at fair value, including the general classification of such assets pursuant to the fair value hierarchy.

Corporate, Agencies, Government and Municipal Bonds: The pricing vendor employs a multi-dimensional model which uses standard inputs including (listed in approximate order of priority for use) benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, market bids/offers and other reference data. The pricing vendor also monitors market indicators, as well as industry and economic events. All bonds valued using these techniques are classified as Level 2. All corporate, agency, government and municipal securities are deemed Level 2.

Mortgage-backed Securities (MBS)/Commercial Mortgage-backed Securities (CMBS) and Asset-backed Securities (ABS): The pricing vendor evaluation methodology primarily includes interest rate movements and new issue data. Evaluation of the tranches (non-volatile, volatile or credit sensitivity) is based on the pricing vendors’ interpretation of accepted modeling and pricing conventions. This information is then used to determine the cash flows for each tranche, benchmark yields, pre-payment assumptions and to incorporate collateral performance. To evaluate MBS and CMBS volatility, an option adjusted spread model is used in combination with models that simulate interest rate paths to determine market price information. This process allows the pricing vendor to obtain evaluations of a broad universe of securities in a way that reflects changes in yield curve, index rates, implied volatility, mortgage rates and recent trade activity. MBS/CMBS and ABS with corroborated, observable inputs are classified as Level 2. All of our MBS/CMBS and ABS are deemed Level 2.

Regulation D Private Placement Securities: All Regulation D privately-placed bonds are classified as corporate securities and deemed Level 3. The pricing vendor evaluation methodology for these securities includes a combination of observable and unobservable inputs. Observable inputs include public corporate spread matrices classified by sector, rating and average life, as well as investment and non-investment grade matrices created from fixed income indices. Unobservable inputs include a liquidity spread premium calculated based on public corporate spread and private corporate spread matrices. The quantitative detail of the liquidity spread premium is neither provided nor reasonably available to the Company. An increase to the credit spread assumptions would result in a lower fair value.

For all of our fixed income securities classified as Level 2, we periodically conduct a review to assess the reasonableness of the fair values provided by our pricing services. Our review consists of a two-pronged approach. First, we compare prices provided by our pricing services to those provided by an additional source. In some cases, we obtain prices from securities brokers and compare them to the prices provided by our pricing services. If discrepancies are found in our comparisons, we compare our prices to actual reported trade data for like securities. No changes to the fair values supplied by our pricing services have occurred as a result of our reviews. Based on these assessments, we have determined that the fair values of our Level 2 fixed income securities provided by our pricing services are reasonable.

Equity Securities: As of March 31, 2024, nearly all of our equity holdings were traded on an exchange. Exchange traded equities have readily observable price levels and are classified as Level 1 (fair value based on quoted market prices). Pricing for the equity securities not traded on an exchange is provided by a third-party pricing source using observable inputs and are classified as Level 2. Pricing for equity securities not traded on an exchange rely on one or more unobservable inputs and are classified as Level 3.

Due to the relatively short-term nature of cash, short-term investments, accounts receivable and accounts payable, their carrying amounts are reasonable estimates of fair value. Our investments in private funds, classified as other invested assets, are measured using the investments’ net asset value per share and are not categorized within the fair value hierarchy.

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2. INVESTMENTS

Our investments are primarily composed of fixed income debt securities and common stock equity securities. We carry our equity securities at fair value and categorize all of our debt securities as available-for-sale, which are carried at fair value.

Realized gains and losses on disposition of investments are based on the specific identification of the investments sold on the settlement date. The following is a summary of the disposition of fixed income and equity securities for the three-month periods ended March 31, 2024 and 2023:

Sales	Proceeds		Gross Realized				Net Realized
(in thousands)	From Sales		Gains		Losses		Gain (Loss)
2024
Fixed income securities - available-for-sale	$	11,819	$	289	$	(793)	$	(504)
Equity securities		15,910		7,234		(121)		7,113
2023
Fixed income securities - available-for-sale	$	3,790	$	35	$	(82)	$	(47)
Equity securities		3,501		2,417		(101)		2,316
Calls/Maturities			Gross Realized				Net Realized
(in thousands)	Proceeds		Gains		Losses		Gain (Loss)
2024
Fixed income securities - available-for-sale	$	72,423	$	33	$	(157)	$	(124)
2023
Fixed income securities - available-for-sale	$	190,305	$	35	$	(40)	$	(5)

FAIR VALUE MEASUREMENTS

Assets measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023 are summarized below:

	As of March 31, 2024
	Quoted Prices in		Significant Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
(in thousands)	(Level 1)		(Level 2)		(Level 3)		Total
Fixed income securities - available-for-sale
U.S. government	$	—	$	329,559	$	—	$	329,559
U.S. agency		—		58,455		—		58,455
Non-U.S. government & agency		—		3,844		—		3,844
Agency MBS		—		414,428		—		414,428
ABS/CMBS/MBS*		—		289,476		—		289,476
Corporate		—		1,158,487		62,560		1,221,047
Municipal		—		546,512		—		546,512
Total fixed income securities - available-for-sale	$	—	$	2,800,761	$	62,560	$	2,863,321
Equity securities		641,758		—		1,609		643,367
Total	$	641,758	$	2,800,761	$	64,169	$	3,506,688

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

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	As of December 31, 2023
	Quoted Prices in		Significant Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
(in thousands)	(Level 1)		(Level 2)		(Level 3)		Total
Fixed income securities - available-for-sale
U.S. government	$	—	$	308,031	$	—	$	308,031
U.S. agency		—		59,826		—		59,826
Non-U.S. government & agency		—		3,882		—		3,882
Agency MBS		—		425,285		—		425,285
ABS/CMBS/MBS*		—		281,182		—		281,182
Corporate		—		1,164,548		60,471		1,225,019
Municipal		—		552,624		—		552,624
Total fixed income securities - available-for-sale	$	—	$	2,795,378	$	60,471	$	2,855,849
Equity securities		588,416		—		1,625		590,041
Total	$	588,416	$	2,795,378	$	62,096	$	3,445,890

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

The following table summarizes changes in the balance of securities whose fair value was measured using significant unobservable inputs (Level 3).

(in thousands)	Level 3 Securities
Balance as of January 1, 2024	$	62,096
Net realized and unrealized gains (losses)
Included in other comprehensive earnings (loss)		(271)
Purchases		2,735
Sales / Calls / Maturities		(391)
Balance as of March 31, 2024	$	64,169
Change in unrealized gains (losses) during the period for Level 3 assets held at period-end - included in other comprehensive earnings (loss)	$	(271)

The amortized cost and fair value of available-for-sale fixed income securities by contractual maturity as of March 31, 2024 were as follows:

	March 31, 2024
(in thousands)	Amortized Cost		Fair Value
Due in one year or less	$	188,801	$	186,550
Due after one year through five years		875,943		843,536
Due after five years through 10 years		696,813		669,310
Due after 10 years		548,944		460,021
ABS/CMBS/MBS*		771,772		703,904
Total available-for-sale	$	3,082,273	$	2,863,321

* Asset-backed, commercial mortgage-backed and mortgage-backed securities

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The amortized cost and fair value of available-for-sale securities at March 31, 2024 and December 31, 2023 are presented in the tables below. Amortized cost does not include the $24 million and $23 million of accrued interest receivable as of March 31, 2024 and December 31, 2023, respectively.

	March 31, 2024
	Cost or		Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
(in thousands)	Cost		Losses		Gains		Losses		Value
U.S. government	$	337,014	$	—	$	388	$	(7,843)	$	329,559
U.S. agency		59,956		—		444		(1,945)		58,455
Non-U.S. government & agency		4,800		—		—		(956)		3,844
Agency MBS		456,358		—		1,208		(43,138)		414,428
ABS/CMBS/MBS*		315,414		(2)		970		(26,906)		289,476
Corporate		1,277,258		(235)		4,732		(60,708)		1,221,047
Municipal		631,473		—		1,413		(86,374)		546,512
Total Fixed Income	$	3,082,273	$	(237)	$	9,155	$	(227,870)	$	2,863,321
	December 31, 2023
	Cost or		Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
(in thousands)	Cost		Losses		Gains		Losses		Value
U.S. government	$	312,632	$	—	$	1,257	$	(5,858)	$	308,031
U.S. agency		60,763		—		652		(1,589)		59,826
Non-U.S. government & agency		4,800		—		—		(918)		3,882
Agency MBS		460,551		—		2,636		(37,902)		425,285
ABS/CMBS/MBS*		308,458		(3)		611		(27,884)		281,182
Corporate		1,273,187		(303)		8,766		(56,631)		1,225,019
Municipal		634,000		—		2,238		(83,614)		552,624
Total Fixed Income	$	3,054,391	$	(306)	$	16,160	$	(214,396)	$	2,855,849

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

Allowance for Credit Losses and Unrealized Losses on Fixed Income Securities

A reversable allowance for credit losses is recognized on available-for-sale fixed income securities. Several criteria are reviewed to determine if securities in the fixed income portfolio should be included in the allowance for expected credit loss evaluation, including:

● Changes in technology that may impair the earnings potential of the investment,

● The discontinuance of a segment of business that may affect future earnings potential,

● Reduction of or non-payment of interest and/or principal,

● Specific concerns related to the issuer’s industry or geographic area of operation,

● Significant or recurring operating losses, poor cash flows and/or deteriorating liquidity ratios and

● Downgrades in credit quality by a major rating agency.

If changes in interest rates and credit spreads do not reasonably explain the unrealized loss for an available-for-sale security, or if any of the criteria above indicate a potential credit loss, the security is subjected to a discounted cash flow analysis. Inputs into the discounted cash flow analysis include prepayment assumptions for structured securities, default rates and recoverability rates based on credit rating. The allowance for any security is limited to the amount that the security’s fair value is below amortized cost. As of March 31, 2024, the discounted cash flow analysis resulted in an allowance for credit losses on 11 securities. The following table presents changes in the allowance for expected credit losses on available-for-sale securities:

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	Three Months Ended March 31,
(in thousands)	2024		2023
Beginning balance	$	306	$	339
Increase to allowance from securities for which credit losses were not previously recorded		12		54
Reduction from securities sold during the period		(67)		—
Net increase (decrease) from securities that had an allowance at the beginning of the period		(14)		72
Balance as of March 31,	$	237	$	465

We recognized $2 million of losses on securities for which we no longer had the intent to hold until recovery during the first three months of 2023. No such losses were recognized during the first three months of 2024.

As of March 31, 2024, in addition to the securities included in the allowance for credit losses, the fixed income portfolio contained 1,336 securities with an unrealized loss position for which an allowance for credit losses had not been recorded. The $228 million in associated unrealized losses represents 7 percent of the fixed income portfolio’s cost basis and 6 percent of total invested assets. Isolated to these securities, unrealized losses increased slightly through the first three months of 2024, as interest rates increased during the period. Of the total 1,336 securities, 1,135 have been in an unrealized loss position for 12 consecutive months or longer. The following table illustrates the total value of fixed income securities that were in an unrealized loss position as of March 31, 2024 and December 31, 2023 after factoring in the allowance for credit losses. All fixed income securities continue to pay the expected coupon payments and we believe we will recover the amortized cost basis of available-for-sale securities that remain in an unrealized loss position.

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	March 31, 2024						December 31, 2023
(in thousands)	< 12 Mos.		12 Mos. & Greater		Total		< 12 Mos.		12 Mos. & Greater		Total
U.S. government
Fair value	$	78,413	$	203,962	$	282,375	$	37,718	$	204,556	$	242,274
Amortized cost		79,565		210,653		290,218		37,950		210,182		248,132
Unrealized loss	$	(1,152)	$	(6,691)	$	(7,843)	$	(232)	$	(5,626)	$	(5,858)
U.S. agency
Fair value	$	15,822	$	28,854	$	44,676	$	8,736	$	29,632	$	38,368
Amortized cost		15,995		30,626		46,621		8,790		31,167		39,957
Unrealized loss	$	(173)	$	(1,772)	$	(1,945)	$	(54)	$	(1,535)	$	(1,589)
Non-U.S. government
Fair value	$	—	$	3,844	$	3,844	$	—	$	3,882	$	3,882
Amortized cost		—		4,800		4,800		—		4,800		4,800
Unrealized Loss	$	—	$	(956)	$	(956)	$	—	$	(918)	$	(918)
Agency MBS
Fair value	$	55,007	$	288,704	$	343,711	$	61,196	$	275,707	$	336,903
Amortized cost		56,100		330,749		386,849		61,714		313,091		374,805
Unrealized loss	$	(1,093)	$	(42,045)	$	(43,138)	$	(518)	$	(37,384)	$	(37,902)
ABS/CMBS/MBS*
Fair value	$	25,663	$	182,583	$	208,246	$	12,240	$	211,436	$	223,676
Amortized cost		25,831		209,321		235,152		12,367		239,193		251,560
Unrealized loss	$	(168)	$	(26,738)	$	(26,906)	$	(127)	$	(27,757)	$	(27,884)
Corporate
Fair value	$	185,542	$	795,631	$	981,173	$	67,402	$	822,731	$	890,133
Amortized cost		188,580		853,301		1,041,881		68,345		878,419		946,764
Unrealized loss	$	(3,038)	$	(57,670)	$	(60,708)	$	(943)	$	(55,688)	$	(56,631)
Municipal
Fair value	$	74,207	$	418,819	$	493,026	$	61,218	$	391,361	$	452,579
Amortized cost		75,247		504,153		579,400		61,697		474,496		536,193
Unrealized loss	$	(1,040)	$	(85,334)	$	(86,374)	$	(479)	$	(83,135)	$	(83,614)
Total fixed income
Fair value	$	434,654	$	1,922,397	$	2,357,051	$	248,510	$	1,939,305	$	2,187,815
Amortized cost		441,318		2,143,603		2,584,921		250,863		2,151,348		2,402,211
Unrealized loss	$	(6,664)	$	(221,206)	$	(227,870)	$	(2,353)	$	(212,043)	$	(214,396)

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

The following table shows the composition of the fixed income securities in unrealized loss positions, after factoring in the allowance for credit losses, at March 31, 2024 by the National Association of Insurance Commissioners (NAIC) rating and the generally equivalent Standard & Poor’s (S&P) and Moody’s ratings. The vast majority of the securities are rated by S&P and/or Moody’s.

	Equivalent	Equivalent	(dollars in thousands)
NAIC	S&P	Moody’s	Amortized				Unrealized		Percent
Rating	Rating	Rating	Cost		Fair Value		Loss		to Total
1	AAA/AA/A	Aaa/Aa/A	$	2,137,898	$	1,941,077	$	(196,821)	86.4	%
2	BBB	Baa		397,220		369,097		(28,123)	12.3	%
3	BB	Ba		31,428		29,952		(1,476)	0.7	%
4	B	B		14,826		14,073		(753)	0.3	%
5	CCC	Caa		2,730		2,421		(309)	0.1	%
6	CC or lower	Ca or lower		819		431		(388)	0.2	%
		Total	$	2,584,921	$	2,357,051	$	(227,870)	100.0	%

Other Invested Assets

We had $59 million of other invested assets at March 31, 2024, compared to $59 million at December 31, 2023. Other invested assets include investments in low income housing tax credit partnerships (LIHTC) and historic tax credit partnerships (HTC), membership in the Federal Home Loan Bank of Chicago (FHLBC), and investments in private funds. Our LIHTC and

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HTC investments are carried at amortized cost and our investment in FHLBC stock is carried at cost. Due to the nature of the LIHTC, HTC and our membership in the FHLBC, their carrying amounts approximate fair value. The private funds are carried at fair value, using each investment’s net asset value.

Our LIHTC interests had a balance of $9 million at March 31, 2024, compared to $10 million on December 31, 2023. Our LIHTC interests recognized amortization of $1 million as a component of income tax expense and a total tax benefit of $1 million during the first quarter of 2024 and 2023. Our unfunded commitment for our LIHTC investments was less than $1 million at March 31, 2024 and will be paid out in installments through 2035.

Our HTC investment had a balance of $12 million at March 31, 2024, compared to $13 million at December 31, 2023. Our HTC investment recognized $1 million of amortization as a component of income tax expense and a total tax benefit of $1 million during the first quarter of 2024 and 2023.

As of March 31, 2024, $57 million of investments were pledged as collateral with the FHLBC to ensure timely access to the secured lending facility that ownership of FHLBC stock provides. As of March 31, 2024, $50 million of borrowings were outstanding with the FHLBC.

Our investments in private funds totaled $27 million as of March 31, 2024, down from $28 million as of December 31, 2023, and had $4 million of associated unfunded commitments at March 31, 2024. Our interest in private funds is generally restricted from being transferred or otherwise redeemed without prior consent by the respective entities, and the timed dissolution of the partnerships would trigger redemption.

Investments in Unconsolidated Investees

We had $66 million of investments in unconsolidated investees at March 31, 2024, compared to $57 million at December 31, 2023. At March 31, 2024, our investment in Prime Holdings Insurance Services, Inc. (Prime) was $66 million and other investments in unconsolidated investees totaled less than $1 million.

Cash and Short-Term Investments

Cash consists of uninvested balances in bank accounts. Short-term investments consist of investments with original maturities of 90 days or less, primarily AAA-rated government money market funds. Short-term investments are carried at cost. We had a cash and short-term investment balance of $45 million and $147 million, respectively, at March 31, 2024, compared to $36 million and $135 million, respectively, at December 31, 2023.

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3. HISTORICAL LOSS AND LAE DEVELOPMENT

The following table is a reconciliation of our unpaid losses and settlement expenses (LAE) for the first three months of 2024 and 2023:

	For the Three Months
	Ended March 31,
(in thousands)	2024		2023
Unpaid losses and LAE at beginning of year
Gross	$	2,446,025	$	2,315,637
Ceded		(757,349)		(740,089)
Net	$	1,688,676	$	1,575,548
Increase (decrease) in incurred losses and LAE
Current accident year	$	186,217	$	166,270
Prior accident years		(42,393)		(51,782)
Total incurred	$	143,824	$	114,488
Loss and LAE payments for claims incurred
Current accident year	$	(12,975)	$	(7,983)
Prior accident years		(102,011)		(95,905)
Total paid	$	(114,986)	$	(103,888)
Net unpaid losses and LAE at March 31,	$	1,717,514	$	1,586,148
Unpaid losses and LAE at March 31,
Gross	$	2,532,190	$	2,286,063
Ceded		(814,676)		(699,915)
Net	$	1,717,514	$	1,586,148

For the first three months of 2024, incurred losses and LAE included $42 million of favorable development on prior years’ loss reserves, largely from accident years 2016 through 2019 and 2023. Marine, commercial property, personal umbrella, general liability, executive products, transportation and surety were drivers of the favorable development. No products experienced significant adverse development.

For the first three months of 2023, incurred losses and LAE included $52 million of favorable development on prior years’ loss reserves, largely from accident years 2016 and 2018 through 2022. Marine, general liability, professional services, commercial excess, executive products, personal umbrella, surety and commercial property were drivers of the favorable development. No products experienced significant adverse development.

4. INCOME TAXES

Our effective tax rate for the three months ended March 31, 2024 was 20.1 percent, compared to 19.5 percent for the same period in 2023. Effective rates are dependent upon components of pretax earnings and the related tax effects. The effective tax rate was higher for the three-month period in 2024, as higher pretax income decreased the percentage impact of tax-favored adjustments.

Income tax expense attributable to income from operations for the three-month period ended March 31, 2024 and 2023 differed from the amounts computed by applying the U.S. federal tax rate of 21 percent to pretax income by the items detailed in the below table. In interim periods, income taxes are adjusted to reflect the effective tax rate we anticipate for the year, with adjustments flowing through the other items, net line.

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	For the Three Months Ended March 31,
	2024				2023
(in thousands)	Amount		%		Amount		%
Provision for income taxes at the statutory rate of 21%	$	33,598	21.0	%	$	25,786	21.0	%
Increase (reduction) in taxes resulting from:
Excess tax benefit on share-based compensation		(1,874)	(1.2)	%		(1,990)	(1.6)	%
Tax exempt interest income		(260)	(0.2)	%		(283)	(0.2)	%
Dividends received deduction		(235)	(0.1)	%		(224)	(0.2)	%
Tax credit		(768)	(0.5)	%		(513)	(0.4)	%
ESOP dividends paid deduction		(138)	(0.1)	%		(137)	(0.1)	%
Nondeductible expenses		713	0.4	%		601	0.5	%
Other items, net		1,055	0.8	%		740	0.5	%
Total tax expense	$	32,091	20.1	%	$	23,980	19.5	%

We have recorded our deferred tax assets and liabilities using the statutory federal tax rate of 21 percent. We believe it is more likely than not that all deferred tax assets will be recovered, given the carry back availability as well as the result of future operations, which we believe will generate sufficient taxable income to realize the deferred tax asset.

5. STOCK BASED COMPENSATION

Our RLI Corp. Long-Term Incentive Plan (2015 LTIP) was in place from 2015 to 2023. The 2015 LTIP provided for equity-based compensation, including stock options and restricted stock units, up to a maximum of 4,000,000 shares of common stock (subject to adjustment for changes in our capitalization and other events). Between 2015 and 2023, we granted 3,291,388 awards under the 2015 LTIP. The 2015 LTIP was replaced in 2023.

In 2023, our shareholders approved the 2023 RLI Corp. Long-Term Incentive Plan (2023, LTIP), which provides for equity-based compensation. In conjunction with the adoption of the 2023 LTIP, effective May 4, 2023, awards are no longer granted under the 2015 LTIP. Awards under the 2023 LTIP may be in the form of restricted stock, restricted stock units, stock options (incentive or non-qualified), stock appreciation rights, performance units as well as other stock-based awards. Eligibility under the 2023 LTIP is limited to employees, directors, consultants and independent contractors of the Company or any affiliate. The granting of awards under the 2023 LTIP is solely at the discretion of the Human Capital and Compensation Committee of the board of directors or its delegate. The maximum number of shares of common stock available for distribution under the 2023 LTIP is 4,004,891 shares (subject to adjustment for changes in our capitalization and other events). Since the plan’s approval in 2023, we have granted 224,013 awards under the 2023 LTIP, including 28,475 thus far in 2024.

Compensation expense is based on the probable number of awards expected to vest. The total compensation expense related to equity awards was $1.8 million in the three-month period ended March 31, 2024, compared to $2.5 million for the same period in 2023. The total income tax benefit was $0.3 million for the three-month period ended March 31, 2024, compared to $0.4 million for the same period in 2023. Total unrecognized compensation expense relating to outstanding and unvested awards was $5 million, which will be recognized over the weighted average vesting period of 2.63 years.

Stock Options

Under the 2023 LTIP, as under the 2015 LTIP, we grant stock options for shares with an exercise price equal to the fair market value of the shares at the date of grant (subject to adjustments for changes in our capitalization, special dividends and other events as set forth in such plans). Options generally vest and become exercisable over a five-year period and expire eight years after grant.

For most participants, the requisite service period and vesting period will be the same. For participants who are retirement eligible, defined by the plan as those individuals whose age and years of service equals 75 or greater, the requisite service period is deemed to be met and options are immediately expensed on the date of grant. For participants who will become retirement eligible during the vesting period, the requisite service period over which expense is recognized is the period between the grant date and the attainment of retirement eligibility. Shares issued upon option exercise are newly issued shares.

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The following tables summarize option activity for the three-month period ended March 31, 2024:

				Weighted	Aggregate
		Weighted		Average	Intrinsic
		Average		Remaining	Value
	Options	Exercise Price		Contractual Life	(in 000’s)
Outstanding options at January 1, 2024	1,641,710	$	92.62
Options granted	27,875		135.94
Options exercised	(93,470)		64.52
Options canceled/forfeited	(1,365)		109.50
Outstanding options at March 31, 2024	1,574,750	$	95.04	4.58	$	84,145
Exercisable options at March 31, 2024	819,591	$	80.95	3.44	$	55,335

The intrinsic value of options exercised, which is the difference between the fair value and the exercise price, was $8 million and $11 million during the first three months of 2024 and 2023, respectively.

The fair value of options was estimated using a Black-Scholes based option pricing model with the following weighted average grant-date assumptions and weighted average fair values as of March 31:

	2024			2023
Weighted-average fair value of grants	$	30.60		$	27.04
Risk-free interest rates		4.62	%		4.22	%
Dividend yield		2.24	%		2.54	%
Expected volatility		23.05	%		22.93	%
Expected option life		5.08	years		5.01	years

The risk-free rate was determined based on U.S. treasury yields that most closely approximated the options’ expected life. The dividend yield was determined based on the average annualized quarterly dividends paid during the most recent five-year period and incorporated a consideration for special dividends paid in recent history. The expected volatility was calculated based on the median of the rolling volatilities for the expected life of the options. The expected option life was determined based on historical exercise behavior and the assumption that all outstanding options will be exercised at the midpoint of the current date and remaining contractual term, adjusted for the demographics of the current year’s grant.

Restricted Stock Units

In addition to stock options, restricted stock units (RSUs) are granted with a value equal to the closing stock price of the Company’s stock on the dates the units are granted. For employees, these units generally have a three-year cliff vesting, but have an accelerated vesting feature for participants who are retirement eligible, defined by the plan as those individuals whose age and years of service equals 75 or greater. For directors, these units vest on the earlier of one year from the date of grant or the next annual shareholders meeting. In addition, the RSUs have dividend participation, which accrue as additional units and are settled with granted stock units at the end of the vesting period.

		Weighted
		Average
		Grant Date
	RSUs	Fair Value
Nonvested at January 1, 2024	45,093	$	125.16
Granted	600		142.08
Reinvested	85		145.36
Forfeited	(128)		124.07
Nonvested at March 31, 2024	45,650	$	125.43

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6. OPERATING SEGMENT INFORMATION

Selected information by operating segment is presented in the table below. Additionally, the table reconciles segment totals to total earnings and total revenues.

	For the Three Months
Revenues	Ended March 31,
(in thousands)	2024		2023
Casualty	$	198,276	$	186,031
Property		129,411		88,767
Surety		32,989		32,925
Net premiums earned	$	360,676	$	307,723
Net investment income		32,847		27,084
Net realized gains		5,994		14,620
Net unrealized gains on equity securities		45,314		15,496
Total consolidated revenue	$	444,831	$	364,923
Net Earnings
(in thousands)	2024		2023
Casualty	$	13,674	$	31,831
Property		57,716		28,383
Surety		6,305		7,676
Net underwriting income	$	77,695	$	67,890
Net investment income		32,847		27,084
Net realized gains		5,994		14,620
Net unrealized gains on equity securities		45,314		15,496
General corporate expense and interest on debt		(6,628)		(6,222)
Equity in earnings of unconsolidated investees		4,769		3,923
Earnings before income taxes	$	159,991	$	122,791
Income tax expense		32,091		23,980
Net earnings	$	127,900	$	98,811

The following table further summarizes revenues by major product type within each operating segment:

	For the Three Months
Net Premiums Earned	Ended March 31,
(in thousands)	2024		2023
Casualty
Commercial excess and personal umbrella	$	80,035	$	67,582
Commercial transportation		27,301		25,232
General liability		25,412		25,900
Professional services		25,085		24,357
Small commercial		18,337		17,941
Executive products		5,915		6,353
Other casualty		16,191		18,666
Total	$	198,276	$	186,031
Property
Commercial property	$	87,605	$	49,262
Marine		32,568		30,636
Other property		9,238		8,869
Total	$	129,411	$	88,767
Surety
Transactional	$	12,108	$	12,047
Commercial		10,625		12,418
Contract		10,256		8,460
Total	$	32,989	$	32,925
Grand Total	$	360,676	$	307,723

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7. LEASES

Right-of-use (ROU) assets are included in the other assets line item and lease liabilities are included in the other liabilities line item of the consolidated balance sheet. We determine if a contract contains a lease at inception and recognize operating lease ROU assets and operating lease liabilities based on the present value of the future minimum lease payments at the commencement date. As our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of future payments. Lease agreements may include options to extend or terminate. The options are exercised at our discretion and are included in operating lease liabilities if it is reasonably certain the option will be exercised. Lease agreements have lease and non-lease components, which are accounted for as a single lease component. Operating lease costs for future minimum lease payments are recognized on a straight-line basis over the lease terms. Variable lease costs are expensed in the period in which the obligations are incurred. Sublease income is recognized on a straight-line basis over the sublease term.

The Company’s operating lease obligations are for branch office facilities. The components of lease expense and other lease information as of and during the three-month periods ended March 31, 2024 and 2023 were as follows:

	For the Three Months
	Ended March 31,
(in thousands)	2024		2023
Operating lease cost	$	1,181	$	1,269
Variable lease cost		269		438
Sublease income		(42)		(139)
Total lease cost	$	1,408	$	1,568
Cash paid for amounts included in measurement of lease liabilities
Operating cash outflows from operating leases	$	1,063	$	1,398
ROU assets obtained in exchange for new operating lease liabilities	$	3,456	$	41
Reduction to ROU assets resulting from reduction to lease liabilities	$	—	$	200

(in thousands)	March 31, 2024			December 31, 2023
Operating lease ROU assets	$	16,083		$	13,666
Operating lease liabilities	$	17,415		$	14,880
Weighted-average remaining lease term - operating leases		6.16	years		6.08	years
Weighted-average discount rate - operating leases		3.48	%		3.21	%

Future minimum lease payments under non-cancellable leases as of March 31, 2024 were as follows:

(in thousands)	March 31, 2024
2024	$	3,248
2025		4,048
2026		3,256
2027		2,135
2028		1,544
2029		1,450
Thereafter		4,199
Total future minimum lease payments	$	19,880
Less imputed interest		(2,465)
Total operating lease liability	$	17,415

8. ACQUISITONS AND DISPOSTIONS

On September 30, 2022, RLI Corp. completed the sale of its equity method investment in Maui Jim, Inc. to Kering Eyewear. During the first quarter of 2023, the payout of the working capital escrow resulted in the recognition of a $14 million gain that was recorded in the net realized gain line item of the statement of earnings.

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

Forward looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 appear throughout this report. These forward looking statements generally include words such as “expect,” “predict,” “estimate,” “will,” “should,” “anticipate,” “believe” and similar expressions. Such assumptions are, in turn, based on information available and internal estimates and analyses of general economic conditions, competitive factors, conditions specific to the property and casualty insurance and reinsurance industries, claims development and the impact thereof on our loss reserves, the adequacy and financial security of our reinsurance programs, developments in the securities market and the impact on our investment portfolio, regulatory changes and conditions and other factors. These assumptions are subject to various risks, uncertainties and other factors, including, without limitation those set forth in “Item 1A. Risk Factors” within the Annual Report on Form 10-K for the year ended December 31, 2023 and Part II within this report. Actual results could differ materially from those expressed in, or implied by, these forward looking statements. Forward looking statements reflect the Company’s expectations, plans or forecasts of future events and views as of the date of this report. While the Company may elect to update these forward looking statements at some point in the future, the Company specifically disclaims any obligation to do so. You should review the various risks, uncertainties and other factors listed from time to time in our Securities and Exchange Commission filings.

OVERVIEW

RLI Corp. is a U.S.-based, specialty insurance company that underwrites select property, casualty and surety products through major subsidiaries. Our focus is on niche markets and developing unique products that are tailored to customers’ needs. We hire underwriters and claim examiners with deep expertise and provide exceptional customer service and support. We maintain a highly diverse product portfolio and underwrite for profit in all market conditions. In 2023, we achieved our 28th consecutive year of underwriting profitability. Over the 28-year period, we averaged an 88.2 combined ratio. This drives our ability to provide shareholder returns in three different ways: the underwriting income itself, net investment income from our investment portfolio and long-term appreciation in our equity portfolio.

We measure the results of our insurance operations by monitoring growth and profitability across three distinct business segments: casualty, property and surety. Growth is measured in terms of gross premiums written, and profitability is analyzed through combined ratios, which are further subdivided into their respective loss and expense components.

The property and casualty insurance business is cyclical and influenced by many factors, including price competition, economic conditions, natural or man-made disasters (for example, earthquakes, hurricanes, pandemics and terrorism), interest rates, state regulations, court decisions and changes in the law. One of the unique and challenging features of the property and casualty insurance business is that coverages must be priced before costs have fully developed, because premiums are charged before claims are incurred. This requires that liabilities be estimated and recorded in recognition of future loss and settlement obligations. Due to the inherent uncertainty in estimating these liabilities, there can be no assurance that actual liabilities will equal recorded amounts. If actual liabilities differ from recorded amounts, there will either be an adverse or favorable effect on net earnings.

The casualty portion of our business consists largely of commercial excess, personal umbrella, general liability, transportation and management liability coverages, as well as package business and other specialty coverages, such as professional liability and workers’ compensation for office-based professionals. We also assume a limited amount of risks through quota share and excess of loss reinsurance agreements. The casualty business is subject to the risk of estimating losses and related loss reserves because the ultimate settlement of a casualty claim may take several years to fully develop. The casualty segment is also subject to inflation risk and may be affected by evolving legislation and court decisions that define the extent of coverage and the amount of compensation due for injuries or losses.

Our property segment is comprised primarily of commercial fire, hurricane, earthquake, difference in conditions and marine coverages. We also offer homeowners’ coverages in Hawaii. Property insurance results are subject to the variability introduced by perils such as earthquakes, fires, hurricanes and other storms. Our major catastrophe exposure is to losses caused by earthquakes, primarily on the West Coast, and windstorms affecting commercial properties in coastal regions of the United States. We limit our net aggregate exposure to a catastrophic event by managing the total policy limits written in a particular region, purchasing reinsurance and maintaining policy terms and conditions throughout insurance cycles. We also use computer-assisted modeling techniques to provide estimates that help the Company carefully manage the concentration of risks exposed to catastrophic events.

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The surety segment specializes in writing small to medium-sized contract surety coverages, including payment and performance bonds. We offer a variety of commercial surety bonds for medium to large-sized businesses across a broad spectrum of industries, including the financial, healthcare and energy, including renewable energy. We also offer a variety of transactional bonds including, but not limited to license and permit, notary and court bonds. Often, our surety coverages involve a statutory requirement for bonds. While these bonds typically maintain a relatively low loss ratio, losses may fluctuate due to adverse economic conditions affecting the financial viability of our insureds. The contract surety product guarantees commercial contractors’ contractual obligations for a specific construction project. Generally, losses occur due to the deterioration of a contractor’s financial condition. This line has historically produced marginally higher loss ratios than other surety lines during economic downturns.

The insurance marketplace is competitive across all of our segments. However, we believe that our business model is built to create underwriting income by focusing on sound risk selection and discipline. Our primary focus will continue to be on underwriting profitability, with a secondary focus on premium growth where we believe underwriting profit exists, as opposed to general premium growth or market share measurements.

Key Performance Measures

The following is a list of key performance measures found throughout this report with their definitions, relationships to GAAP measures and explanations of their importance to our operations.

Underwriting Income

Underwriting income or profit represents one measure of the pretax profitability of our insurance operations, and is derived by subtracting losses and settlement expenses, policy acquisition costs and insurance operating expenses from net premiums earned, which are all GAAP financial measures. Each of these components are presented in the statements of earnings but is not subtotaled. However, this information is available in total and by segment in note 6 to the unaudited condensed consolidated interim financial statements in this quarterly report on Form 10-Q, and in note 12 to the consolidated financial statements in our 2023 Annual Report on Form 10-K, regarding operating segment information. The nearest comparable GAAP measure is earnings before income taxes which, in addition to underwriting income, includes net investment income, net realized gains or losses, net unrealized gains or losses on equity securities, general corporate expenses, debt costs and our portion of earnings from unconsolidated investees. A reconciliation of net earnings to underwriting income follows:

	For the Three Months
	Ended March 31,
(in thousands)	2024		2023
Net earnings	$	127,900	$	98,811
Income tax expense		32,091		23,980
Earnings before income taxes	$	159,991	$	122,791
Equity in earnings of unconsolidated investees		(4,769)		(3,923)
General corporate expenses		5,010		4,214
Interest expense on debt		1,618		2,008
Net unrealized gains on equity securities		(45,314)		(15,496)
Net realized gains		(5,994)		(14,620)
Net investment income		(32,847)		(27,084)
Net underwriting income	$	77,695	$	67,890

Combined Ratio

The combined ratio, which is derived from components of underwriting income, is a common industry performance measure of profitability for underwriting operations and is calculated in two components. First, the loss ratio is losses and settlement expenses divided by net premiums earned. The second component, the expense ratio, reflects the sum of policy acquisition costs and insurance operating expenses divided by net premiums earned. All items included in these components of the combined ratio are presented in our GAAP consolidated financial statements. The sum of the loss and expense ratios is the combined ratio. The difference between the combined ratio and 100 reflects the per-dollar rate of underwriting income or loss.

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Critical Accounting Policies

In preparing the unaudited condensed consolidated interim financial statements, we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses for the reporting period. Actual results could differ significantly from those estimates.

The most critical accounting policies involve significant estimates and include those used in determining the liability for unpaid losses and settlement expenses, investment valuation, recoverability of reinsurance balances, deferred policy acquisition costs and deferred taxes. For a detailed discussion of each of these policies, refer to our 2023 Annual Report on Form 10-K.

There have been no significant changes to critical accounting policies during the year.

RESULTS OF OPERATIONS

Three Months Ended March 31, 2024 Compared to Three Months Ended March 31, 2023

Net premiums earned increased 17 percent, driven by products in our property and casualty segments. Positive market performance resulted in $45 million of unrealized gains on equity securities in the first three months of 2024, compared to $15 million in 2023. Investment income was up 21 percent, due to an increased average asset base and higher interest rates relative to the prior year. Realized gains during the first three months of 2024 were comprised of $7 million of realized gains on equity securities, primarily due to rebalancing within our equity strategies, and $1 million of realized losses on the fixed income portfolio. This compares to $2 million of realized gains on the equity portfolio, $2 million of realized losses on the fixed income portfolio and $14 million of realized gains from the payout of the working capital escrow from our sale of Maui Jim, Inc. (Maui Jim) in the previous year.

	For the Three Months
	Ended March 31,
Consolidated Revenues (in thousands)	2024		2023
Net premiums earned	$	360,676	$	307,723
Net investment income		32,847		27,084
Net realized gains		5,994		14,620
Net unrealized gains on equity securities		45,314		15,496
Total consolidated revenue	$	444,831	$	364,923

Underwriting income was $78 million on a 78.5 combined ratio for the first three months of 2024, compared to $68 million on a 77.9 combined ratio in the same period of 2023. A larger earned premium base resulted in higher levels of underwriting income. Underwriting results were impacted by $12 million of pretax storm losses in 2024 and $4 million of pretax storm losses in 2023. Results for each period benefited from favorable development on prior years’ loss reserves, which provided additional pretax earnings of $42 million in the first three months of 2024, compared to $52 million in 2023.

The loss ratio increased to 39.9 from 37.2, due to a decrease in favorable development on prior accident years’ loss reserves and higher levels of catastrophe losses in 2024. The expense ratio decreased to 38.6 from 40.7. Despite continued investments in our people and technology, as well as higher levels of bonus and profit-sharing expenses that resulted from improved operating performance, growth of net premiums earned allowed for improved leveraging of our expense base.

Bonus and profit-sharing amounts earned by executives, managers and associates are predominantly influenced by corporate performance, including operating earnings, combined ratio and return on capital. Favorable development and other drivers of growth in book value will increase bonus and profit-sharing expenses, while catastrophe losses, adverse development and decreased investment portfolio returns would lead to expense reductions. These performance-related expenses affect policy acquisition, insurance operating and general corporate expenses.

Our equity in earnings of unconsolidated investees primarily relates to our investment in Prime Holdings Insurance Services, Inc. (Prime), a specialty insurance company. We recognized $5 million of investee earnings from Prime in the first three months of 2024, compared to $4 million in 2023.

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Net earnings for the first three months of 2024 totaled $128 million, compared to $99 million for the same period in 2023. Higher levels of underwriting income, investment income and unrealized gains on equity securities all contributed to the improved results.

Comprehensive earnings totaled $115 million for the first three months of 2024, compared to $137 million for the first three months of 2023. Other comprehensive earnings (loss) primarily included net after-tax unrealized gains (losses) from the fixed income portfolio. Other comprehensive loss of $13 million in the first three months of 2024 was attributable to higher interest rates, which decreased the fair value of securities held in the fixed income portfolio. Comparatively, $38 million of other comprehensive earnings was recognized in 2023, as declining interest rates increased the fair value of securities held in the fixed income portfolio.

Premiums

Gross premiums written increased $54 million for the first three months of 2024, compared to the same period of 2023. Growth was achieved in all three segments. Net premiums earned increased $53 million, driven by products in our property and casualty segments.

	Gross Premiums Written						Net Premiums Earned
	For the Three Months						For the Three Months
	Ended March 31,						Ended March 31,
(in thousands)	2024		2023		% Change		2024		2023		% Change
Casualty
Commercial excess and personal umbrella	$	102,182	$	81,431	25	%	$	80,035	$	67,582	18	%
Commercial transportation		29,129		22,873	27	%		27,301		25,232	8	%
General liability		26,760		24,789	8	%		25,412		25,900	(2)	%
Professional services		26,792		26,189	2	%		25,085		24,357	3	%
Small commercial		21,626		19,959	8	%		18,337		17,941	2	%
Executive products		16,413		17,827	(8)	%		5,915		6,353	(7)	%
Other casualty		22,427		24,766	(9)	%		16,191		18,666	(13)	%
Total	$	245,329	$	217,834	13	%	$	198,276	$	186,031	7	%
Property
Commercial property	$	128,694	$	111,939	15	%	$	87,605	$	49,262	78	%
Marine		40,574		37,189	9	%		32,568		30,636	6	%
Other property		11,096		9,718	14	%		9,238		8,869	4	%
Total	$	180,364	$	158,846	14	%	$	129,411	$	88,767	46	%
Surety
Transactional		14,114		13,347	6	%		12,108		12,047	1	%
Commercial	$	15,631	$	15,096	4	%	$	10,625	$	12,418	(14)	%
Contract		13,237		9,889	34	%		10,256		8,460	21	%
Total	$	42,982	$	38,332	12	%	$	32,989	$	32,925	0	%
Grand Total	$	468,675	$	415,012	13	%	$	360,676	$	307,723	17	%

Casualty

Gross premiums written for the casualty segment increased $27 million in the first three months of 2024. We continued to benefit from positive rate movement across a large portion of our casualty segment, as well as from new business growth across our personal umbrella and small commercial distribution channels. General liability premium grew as we were able to secure new accounts and commercial transportation benefited from an increase in submissions, as well as the timing of a large renewal. However, executive products premium continued to decline as a result of competitive market conditions.

Property

Gross premiums written for the property segment increased $22 million in the first three months of 2024. Our commercial property business was up $17 million, as wind rates continued to increase, though at a more moderate pace than in recent quarters. New opportunities led to $3 million of premium growth for our marine product. Additionally, some competitors have reduced their appetite for select Hawaii homeowner coverages, which has allowed our other property premium to grow.

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Surety

Gross premiums written for the surety segment increased $5 million for the first three months of 2024. Contract surety benefited from new agency relationships, new construction projects and continued increases in material costs.

Underwriting Income

	For the Three Months
	Ended March 31,
	2024		2023
Underwriting Income (in thousands)
Casualty	$	13,674	$	31,831
Property		57,716		28,383
Surety		6,305		7,676
Total	$	77,695	$	67,890
Combined Ratio
Casualty		93.2		82.9
Property		55.3		68.0
Surety		80.8		76.7
Total		78.5		77.9

Casualty

The casualty segment recorded underwriting income of $14 million in the first three months of 2024, compared to $32 million for the same period last year. Prior accident years’ reserve releases reduced loss and settlement expenses for the casualty segment by $18 million, primarily on accident years 2016 through 2019 and 2023. Favorable development was widespread, with notable amounts from personal umbrella, general liability, executive products and transportation. In comparison, $36 million of prior accident years’ reserves were released in the first three months of 2023. General liability, professional services, commercial excess, executive products and personal umbrella were drivers of the favorable development in 2023.

The combined ratio for the casualty segment was 93.1 in 2024, compared to 82.9 in 2023. The segment’s loss ratio was 55.2 in 2024, up from 45.5 in 2023. Lower levels of reserve releases on prior accident years resulted in the higher loss ratio in 2024. The expense ratio for the casualty segment was 37.9, up from 37.4 for the same period last year.

Property

The property segment recorded underwriting income of $58 million for the first three months of 2024, compared to $28 million for the same period last year. Underwriting results for 2024 included $19 million of favorable development on prior years’ loss and catastrophe reserves and $12 million of storm losses in the current year. Comparatively, the 2023 underwriting results included $13 million of favorable development on prior years’ loss and catastrophe reserves and $4 million of other storm losses.

Underwriting results for the first three months of 2024 translated into a combined ratio of 55.4, compared to 68.0 for the same period last year. The segment’s loss ratio was 25.2 in 2024, down from 29.8 in 2023. Larger releases on prior years’ loss reserves and low attritional, non-catastrophe losses more than offset the impact of higher storm losses. The segment’s expense ratio decreased to 30.2 in 2024 from 38.2 in the prior year, as the growth in the earned premium base exceeded the growth in expense. Additionally, the expense ratio benefited from an increase in expense override we earn for writing business on behalf of other carriers.

Surety

The surety segment recorded underwriting income of $6 million for the first three months of 2024, compared to $8 million for the same period last year. Both periods reflected positive current accident year underwriting performance and benefited from favorable development on prior years’ loss reserves. Results for 2024 included favorable development on prior accident years’ reserves, which decreased loss and settlement expenses for the segment by $5 million. Results for 2023 included $3 million of favorable development on prior accident years’ reserves. Additionally, $2 million of reinsurance

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reinstatement premium was recorded in 2024 on a prior year loss, which reduced net premiums earned and underwriting income.

The combined ratio for the surety segment totaled 80.9 for the first three months of 2024, compared to 76.7 for the same period in 2023. The segment’s loss ratio was 5.4 in 2024, down from 10.2 in 2023, due to higher levels of favorable prior accident years’ reserve development. The expense ratio was 75.5, up from 66.5 in the prior year. The impact of the reinsurance reinstatement premium on the earned premium base increased the expense ratio by 4.3 points. In addition, the increase in expense ratio was the result of continued investments in technology and people to support growth and improve customer experiences.

Investment Income

Our investment portfolio generated net investment income of $33 million during the first three months of 2024, an increase of 21 percent from that reported for the same period in 2023. The increase in investment income was due to higher interest rates, as well as an increased average asset base relative to the prior year.

Yields on our fixed income investments for the first three months of 2024 and 2023 were as follows:

	2024		2023
Pretax Yield
Taxable	3.72	%	3.39	%
Tax-Exempt	2.85	%	2.79	%
After-Tax Yield
Taxable	2.94	%	2.68	%
Tax-Exempt	2.70	%	2.64	%

The following table depicts the composition of our investment portfolio at March 31, 2024 as compared to December 31, 2023:

(in thousands)	March 31, 2024				December 31, 2023
Fixed income	$	2,863,321	76.2	%	$	2,855,849	77.7	%
Equity securities		643,367	17.1	%		590,041	16.0	%
Short-term investments		147,186	3.9	%		134,923	3.7	%
Other invested assets		59,273	1.6	%		59,081	1.6	%
Cash		44,557	1.2	%		36,424	1.0	%
Total investments and cash	$	3,757,704	100.0	%	$	3,676,318	100.0	%

We believe our overall asset allocation supports our strategy to preserve capital for policyholders, provide sufficient income to support insurance operations and effectively grow book value over a long-term investment horizon.

The fixed income portfolio increased by $7 million in the first three months of 2024. Average fixed income duration was 4.6 years at March 31, 2024, reflecting our liability structure and sound capital position. The equity portfolio increased by $53 million during the first three months of 2024, due to the positive performance of equity markets. Short-term investments increased by $12 million, as improved yields made AAA-rated government money market funds an investable asset class.

Income Taxes

Our effective tax rate for the first three months of 2024 was 20.1 percent, compared to 19.5 percent for the same period in 2023. Effective rates are dependent upon components of pretax earnings or losses and the related tax effects. The effective tax rate was higher for the three-month period in 2024, as higher pretax income decreased the percentage impact of tax-favored adjustments, such as tax credits and excess tax benefits on share-based compensation.

LIQUIDITY AND CAPITAL RESOURCES

We have three primary types of cash flows: (1) cash flows from operating activities, which consist mainly of cash generated by our underwriting operations and income earned on our investment portfolio, (2) cash flows from investing

27

activities related to the purchase, sale and maturity of investments and (3) cash flows from financing activities that impact our capital structure, such as shareholder dividend payments and changes in debt and shares outstanding.

The following table summarizes cash flows provided by (used in) our activities for the three-month periods ended March 31, 2024 and 2023:

(in thousands)	2024		2023
Operating cash flows	$	70,946	$	69,219
Investing cash flows		(53,064)		(57,804)
Financing cash flows		(9,749)		(11,464)
Total	$	8,133	$	(49)

Our largest source of cash is premiums received from customers and our largest cash outflow is claim payments on insured losses. Cash flows from operating activities can vary among periods due to the timing in which these payments are made or received. Operating cash flows in the first three months of 2024 benefited from increased premium receipts relative to the first three months of 2023, but were also impacted by elevated levels of loss and settlement expense payments.

As of March 31, 2024, we had $100 million in debt outstanding. On September 15, 2023, we accessed $50 million from our revolving line of credit with PNC Bank, N.A. (PNC). The borrowing may be repaid at any time and carries an adjustable interest rate of 6.93 percent, which will reset during the second quarter of 2024. The credit facility with PNC was entered into during the first quarter of 2023 and replaced the previous $60 million facility with Bank of Montreal, Chicago Branch, which expired on March 27, 2023. The line of credit permits us to borrow up to an aggregate principal amount of $100 million, but may be increased up to an aggregate principal amount of $130 million under certain conditions. The facility has a three-year term that expires on May 29, 2026. Further, RLI Insurance Company borrowed $50 million from the Federal Home Loan Bank of Chicago (FHLBC) on November 10, 2023. The borrowing matures on November 12, 2024. Interest is paid monthly at an annualized rate of 5.44 percent.

Two of our insurance companies, RLI Insurance Company (RLI Ins.) and Mt. Hawley Insurance Company, are members of the FHLBC. Membership in the Federal Home Loan Bank system provides both companies access to an additional source of liquidity via a secured lending facility. Our membership allows each insurance subsidiary to determine tenor and structure at the time of borrowing. As of March 31, 2024, $57 million of investments were pledged as collateral with the FHLBC to ensure timely access to the secured lending facility.

As of March 31, 2024, we had cash and other investments maturing within one year of approximately $378 million and an additional $879 million maturing between one to five years. Whereas our strategy is to be fully invested at all times, short-term investments in excess of demand deposit balances are considered a component of investment activities, and thus are classified as investments in our consolidated balance sheets.

We believe that cash generated by operations and investments will provide sufficient sources of liquidity to meet our anticipated needs over the next 12 to 24 months. In the event they are not sufficient, we believe cash available from financing activities and other sources will provide sufficient additional liquidity.

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We maintain a diversified investment portfolio representing policyholder funds that have not yet been paid out as claims, as well as the capital we hold for our shareholders. Invested assets at March 31, 2024 have increased $81 million from December 31, 2023. As of March 31, 2024, our investment portfolio had the following asset allocation breakdown:

	Cost or		Fair		Unrealized		% of Total
(in thousands)	Amortized Cost		Value		Gain/(Loss)		Fair Value		Quality*
U.S. government	$	337,014	$	329,559	$	(7,455)	8.8	%	AA+
U.S. agency		59,956		58,455		(1,501)	1.6	%	AA+
Non-U.S. government & agency		4,800		3,844		(956)	0.1	%	BBB+
Agency MBS		456,358		414,428		(41,930)	11.0	%	AA+
ABS/CMBS/MBS**		315,414		289,476		(25,938)	7.7	%	AA+
Corporate		1,277,258		1,221,047		(56,211)	32.5	%	A-
Municipal		631,473		546,512		(84,961)	14.5	%	AA
Total fixed income	$	3,082,273	$	2,863,321	$	(218,952)	76.2	%	AA-
Equity		362,527		643,367		280,840	17.1	%
Short-term investments		147,186		147,186		—	3.9	%
Other invested assets		55,709		59,273		3,564	1.6	%
Cash		44,557		44,557		—	1.2	%
Total portfolio	$	3,692,252	$	3,757,704	$	65,452	100.0	%

* Quality ratings provided by Moody’s, S&P and Fitch

** Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

Quality is an average of each bond’s credit rating, adjusted for its relative weighting in the portfolio. As of March 31, 2024, our fixed income portfolio had the following rating distribution:

					Below
					Investment
	AAA	AA	A	BBB	Grade	No Rating	Fair Value
U.S. government	-	329,559	-	-	-	-	329,559
U.S. agency	-	58,455	-	-	-	-	58,455
Non-U.S. government & agency	-	-	1,680	2,164	-	-	3,844
Agency MBS	-	414,428	-	-	-	-	414,428
ABS/CMBS/MBS*	182,626	23,560	64,620	-	-	18,670	289,476
Corporate	30,905	129,513	523,288	328,119	146,662	62,560	1,221,047
Municipal	142,850	350,658	52,664	-	-	340	546,512
Total	356,381	1,306,173	642,252	330,283	146,662	81,570	2,863,321

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

As of March 31, 2024, our fixed income portfolio remained well diversified, with 1,781 individual issues.

Our investment portfolio has limited exposure to structured asset-backed securities. As of March 31, 2024, we had $148 million in ABS, which are pools of assets collateralized by cash flows from several types of loans, including home equity, credit cards, autos and structured bank loans in the form of collateralized loan obligations (CLOs).

As of March 31, 2024, we had $139 million in commercial and non-agency mortgage-backed securities and $414 million in mortgage-backed securities backed by government sponsored enterprises (GSEs - Freddie Mac, Fannie Mae and Ginnie Mae). Excluding the GSE-backed MBS, our exposure to ABS and CMBS was 7.7 percent of our investment portfolio at quarter end.

We had $1,221 million in corporate fixed income securities as of March 31, 2024, which includes $115 million invested in a high-yield credit strategy. This high-yield portfolio consists of floating rate bank loans and bonds that are below investment grade in credit quality and offer incremental yield over our core fixed income portfolio.

29

The municipal portfolio includes approximately 58 percent taxable securities and 42 percent tax-exempt securities. Approximately 90 percent of our municipal bond portfolio maintains an ‘AA’ or better rating, while 100 percent of the municipal bond portfolio is rated ‘A’ or better.

Securities within the equity portfolio are well diversified and are primarily invested in broad index exchange traded funds (ETFs). Our actively managed equity strategy has a preference for dividend income and value oriented security selection with low turnover, which minimizes transaction costs and taxes throughout our long investment horizon.

As of March 31, 2024, our equity portfolio had a dividend yield of 1.9 percent, compared to 1.4 percent for the S&P 500 index. Because of the corporate dividend-received-deduction applicable to our dividend income, we pay an effective tax rate of 13.1 percent on dividends, compared to 21.0 percent on taxable interest and 5.3 percent on municipal bond interest income. The equity portfolio is managed in a diversified and granular manner, with 85 individual securities and four ETF positions. No single company exposure in the equity portfolio represents more than 1 percent of invested assets.

Other invested assets include investments in low income housing tax credit and historic tax credit partnerships, membership in the FHLBC and investments in private funds.

We had $66 million of investments in unconsolidated investees at March 31, 2024, compared to $57 million at December 31, 2023.

Our investment portfolio does not have any exposure to derivatives.

As of March 31, 2024, our capital structure consisted of $100 million in debt and $1.5 billion of shareholders’ equity. Debt outstanding comprised 6 percent of total capital as of March 31, 2024. Interest and fees on debt obligations totaled $2 million for the first three months of 2024 and 2023. We incurred interest expense on debt at an average annual interest rate of 6.24 percent during the first three months of 2024, compared to 3.89 percent during the same period last year.

We paid a regular quarterly cash dividend of $0.27 per share on March 20, 2024, the same amount as the prior quarter. We have increased dividends in each of the last 48 years.

Our three insurance companies are subsidiaries of RLI Corp, with RLI Ins. as the first-level, or principal, insurance company. At the holding company (RLI Corp.) level, we rely largely on dividends from our insurance subsidiaries to meet our obligations for paying principal and interest on outstanding debt, corporate expenses and dividends to RLI Corp. shareholders. As discussed further below, dividend payments to RLI Corp. from our principal insurance subsidiary are restricted by state insurance laws as to the amount that may be paid without prior approval of the insurance regulatory authorities of Illinois. As a result, we may not be able to receive dividends from such subsidiary at times and in amounts necessary to pay desired dividends to RLI Corp. shareholders. On a GAAP basis, as of March 31, 2024, our holding company had $1.5 billion in equity. This includes amounts related to the equity of our insurance subsidiaries, which is subject to regulatory restrictions under state insurance laws. The unrestricted portion of holding company net assets is comprised primarily of investments and cash, including $153 million in liquid assets. Unrestricted funds at the holding company are available to fund debt interest, general corporate obligations and dividend payments to our shareholders. If necessary, the holding company also has other potential sources of liquidity that could provide for additional funding to meet corporate obligations or pay shareholder dividends, which include a revolving line of credit, as well as access to capital markets.

Ordinary dividends, which may be paid by our principal insurance subsidiary without prior regulatory approval, are subject to certain limitations based upon statutory income, surplus and earned surplus. The maximum ordinary dividend distribution from our principal insurance subsidiary in a rolling 12-month period is limited by Illinois law to the greater of 10 percent of RLI Ins. policyholder surplus, as of December 31 of the preceding year, or the net income of RLI Ins. for the 12-month period ending December 31 of the preceding year. Ordinary dividends are further restricted by the requirement that they be paid from earned surplus. Any dividend distribution in excess of the ordinary dividend limits is deemed extraordinary and requires prior approval from the Illinois Department of Insurance (IDOI). In the first three months of 2024, RLI Ins. paid $17 million in ordinary dividends to RLI Corp. In 2023, RLI Ins. paid ordinary dividends totaling $145 million. As of March 31, 2024, $5 million of the net assets of our principal insurance subsidiary were not restricted and could be distributed to RLI Corp. as ordinary dividends without prior approval from the IDOI. Because the limitations are based upon a rolling 12-month period, the amount and impact of these restrictions vary over time. In addition to restrictions from our principal subsidiary’s insurance regulator, we also consider internal models and how capital adequacy is defined by our rating agencies in determining amounts available for distribution.

30

Item 3.Quantitative and Qualitative Disclosures about Market Risk

There have been no material changes to our exposure to market risk from that reported in our 2023 Annual Report on Form 10-K.

Historically, our primary market risks have been equity price risk associated with investments in equity securities and interest rate risk associated with investments in fixed income securities. We have consistently invested in high credit quality, investment grade securities. See “Item 7A. Quantitative and Qualitative Disclosures About Market Risk” of our 2023 Annual Report on Form 10-K for more information.

Item 4.Controls and Procedures

We maintain a system of controls and procedures designed to provide reasonable assurance as to the reliability of the financial statements and other disclosures included in this report, as well as to safeguard assets from unauthorized use or disposition. An evaluation of the effectiveness of the design and operation of our disclosure controls and procedures was performed, under the supervision and with the participation of management, including our Chief Executive Officer and Chief Financial Officer, as of the end of the period covered by this report. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer have concluded that these disclosure controls and procedures are effective, as of the end of the period covered by this report.

In designing and evaluating our disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurances of achieving the desired control objective, and management necessarily is required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures. We believe that our disclosure controls and procedures provide such reasonable assurance.

No changes were made to our internal control over financial reporting during the last fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

31

PART II - OTHER INFORMATION

Item 1.Legal Proceedings – There were no material changes to report.

Item 1A. Risk Factors – There were no material changes to report.

Item 2.Unregistered Sales of Equity Securities and Use of Proceeds - not applicable.

Item 3.Defaults Upon Senior Securities - Not applicable.

Item 4.Mine Safety Disclosures - Not applicable.

Item 5.Other Information –

Securities Trading Plans of Executive Officers and Directors

Rule 10b5-1 under the Exchange Act provides an affirmative defense that enables prearranged transactions in Company securities in a manner that avoids concerns about initiating transactions at a future date while possibly in possession of material nonpublic information. Our Insider Trading Policy permits our executive officers and directors to enter into trading plans designed to comply with Rule 10b5-1.

During the three months ended March 31, 2024, no director or officer of the Company adopted or terminated a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement, as each term is defined in Item 408(a) of Regulation S-K.

Item 6.Exhibits

Exhibit		Incorporated by Reference		Filed or Furnished
Number	Description of Document	Form	Filing Date	Herewith
31.1	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002			X
31.2	Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002			X
32.1	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002			X
32.2	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002			X
101.INS	Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document			X
101.SCH	Inline XBRL Taxonomy Extension Schema			X
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase			X
101.DEF	Inline XBRL Taxonomy Definition Linkbase			X
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase			X
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase			X
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)			X

32

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	RLI Corp.
	/s/ Todd W. Bryant
	Todd W. Bryant
	Chief Financial Officer
	(Principal Financial and Chief Accounting Officer)
Date: April 24, 2024

33

EX-31.1

Exhibit 31.1

CERTIFICATION

Chief Executive Officer Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Craig W. Kliethermes, certify that:

I have reviewed this quarterly report on Form 10-Q of RLI Corp.;

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;

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;

The registrant’s other certifying officer 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

The registrant’s other certifying officer 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 (or persons performing the equivalent functions):

(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.

Date: April 24, 2024

/s/ Craig W. Kliethermes

Craig W. Kliethermes

President & CEO

EX-31.2

Exhibit 31.2

CERTIFICATION

Chief Financial Officer Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Todd W. Bryant, certify that:

I have reviewed this quarterly report on Form 10-Q of RLI Corp.;

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;

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;

The registrant’s other certifying officer 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

The registrant’s other certifying officer 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 (or persons performing the equivalent functions):

(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.

Date: April 24, 2024

/s/ Todd W. Bryant

Todd W. Bryant

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION 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 RLI Corp. (the “Company”) on Form 10-Q for the period ending March 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Craig W. Kliethermes, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(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.

/s/ Craig W. Kliethermes

Craig W. Kliethermes

President & CEO

April 24, 2024

EX-32.2

Exhibit 32.2

CERTIFICATION 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 RLI Corp. (the “Company”) on Form 10-Q for the period ending March 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Todd W. Bryant, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(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.

/s/ Todd W. Bryant

Todd W. Bryant

Chief Financial Officer

April 24, 2024

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2024	Apr. 16, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2024
Entity File Number	001-09463
Entity Registrant Name	RLI Corp
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	37-0889946
Entity Address, Address Line One	9025 North Lindbergh Drive,
Entity Address, City or Town	Peoria,
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	61615
City Area Code	309
Local Phone Number	692-1000
Title of 12(b) Security	Common Stock $0.01 par value
Trading Symbol	RLI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		45,709,881
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000084246
Amendment Flag	false

XML

Condensed Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Net premiums earned	$ 360,676	$ 307,723
Net investment income	32,847	27,084
Net realized gains	5,994	14,620
Net unrealized gains on equity securities	45,314	15,496
Consolidated revenue	444,831	364,923
Losses and settlement expenses	143,824	114,488
Policy acquisition costs	110,454	101,444
Insurance operating expenses	28,703	23,901
Interest expense on debt	1,618	2,008
General corporate expenses	5,010	4,214
Total expenses	289,609	246,055
Equity in earnings of unconsolidated investees	4,769	3,923
Earnings before income taxes	159,991	122,791
Income tax expense	32,091	23,980
Net earnings	127,900	98,811
Other comprehensive earnings (loss), net of tax	(12,671)	37,707
Comprehensive earnings	$ 115,229	$ 136,518
Basic net earnings per share	$ 2.80	$ 2.17
Diluted net earnings per share	$ 2.77	$ 2.15
Weighted average number of common shares outstanding:
Basic	45,684	45,530
Diluted	46,163	46,035

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Available-for-sale, at fair value (amortized cost of $3,082,273 and allowance for credit losses of $237 at 3/31/24) (amortized cost of $3,054,391 and allowance for credit losses of $306 at 12/31/23)	$ 2,863,321	$ 2,855,849
Equity securities, at fair value (cost - $362,527 at 3/31/24 and $354,022 at 12/31/23)	643,367	590,041
Short-term investments, at cost which approximates fair value	147,186	134,923
Other invested assets	59,273	59,081
Cash	44,557	36,424
Total investments and cash	3,757,704	3,676,318
Accrued investment income	25,353	24,062
Premiums and reinsurance balances receivable, net of allowances for uncollectible amounts of $21,699 at 3/31/24 and $21,438 at 12/31/23	230,537	221,206
Ceded unearned premium	107,822	112,257
Reinsurance balances recoverable on unpaid losses and settlement expenses, net of allowances for uncollectible amounts of $11,085 at 3/31/24 and $10,608 at 12/31/23	814,676	757,349
Deferred policy acquisition costs	152,924	146,566
Property and equipment, at cost, net of accumulated depreciation of $75,558 at 3/31/24 and $74,279 at 12/31/23	46,536	46,715
Investment in unconsolidated investees	66,134	56,966
Goodwill and intangibles	53,562	53,562
Income taxes-deferred	10,700	15,872
Other assets	72,461	69,348
TOTAL ASSETS	5,338,409	5,180,221
Liabilities
Unpaid losses and settlement expenses	2,532,190	2,446,025
Unearned premiums	904,848	892,326
Reinsurance balances payable	35,157	71,507
Funds held	106,430	101,446
Income taxes-current	25,455	3,757
Debt	100,000	100,000
Accrued expenses	68,216	108,880
Other liabilities	45,361	42,766
TOTAL LIABILITIES	3,817,657	3,766,707
Shareholders' Equity
Common stock ($0.01 par value) (Shares authorized - 200,000,000) (68,640,095 shares issued, 45,709,881 shares outstanding at 3/31/24) (68,570,261 shares issued, 45,640,047 shares outstanding at 12/31/23)	687	686
Paid-in capital	366,701	362,345
Accumulated other comprehensive earnings (loss)	(178,974)	(166,303)
Retained earnings	1,725,337	1,609,785
Deferred compensation	12,749	13,539
Treasury shares, at cost (22,930,214 shares at 3/31/24 and 12/31/23)	(405,748)	(406,538)
TOTAL SHAREHOLDERS' EQUITY	1,520,752	1,413,514
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 5,338,409	$ 5,180,221

XML

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement Of Financial Position [Abstract]
Available-for-sale, amortized cost	$ 3,082,273	$ 3,054,391
Available-for-sale, allowance for credit losses	237	306
Equity securities, cost	362,527	354,022
Premiums and reinsurance balances receivable, allowances for uncollectible amounts	21,699	21,438
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts	11,085	10,608
Property and equipment, accumulated depreciation	$ 75,558	$ 74,279
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	68,640,095	68,570,261
Common stock, shares outstanding (in shares)	45,709,881	45,640,047
Treasury stock, shares (in shares)	22,930,214	22,930,214

XML

Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common stock	Paid-in Capital	Accumulated Other Comprehensive Earnings (Loss)	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Deferred Compensation	Treasury Stock at Cost	Cumulative Effect, Period of Adoption, Adjustment	Total
Shareholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2022	$ 684	$ 352,391	$ (229,076)	$ (951)	$ 1,446,341	$ 12,015	$ (405,014)	$ (951)	$ 1,177,341
Shares, Outstanding, Beginning Balance at Dec. 31, 2022	45,469,752
Increase Decrease In Shareholders Equity Roll Forward
Net Income (Loss)					98,811				98,811
Other comprehensive earnings (loss), net of tax			37,707						37,707
Deferred compensation						249	(249)
Share-based compensation	$ 1	2,863							2,864
Share-based compensation (in shares)	84,944
Dividends and dividend equivalents					(11,851)				(11,851)
Shareholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2023	$ 685	355,254	(191,369)		1,532,350	12,264	(405,263)		1,303,921
Shares, Outstanding, Ending Balance at Mar. 31, 2023	45,554,696
Shareholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2023	$ 686	362,345	(166,303)		1,609,785	13,539	(406,538)		1,413,514
Shares, Outstanding, Beginning Balance at Dec. 31, 2023	45,640,047
Increase Decrease In Shareholders Equity Roll Forward
Net Income (Loss)					127,900				127,900
Other comprehensive earnings (loss), net of tax			(12,671)						(12,671)
Deferred compensation						(790)	790
Share-based compensation	$ 1	4,356							4,357
Share-based compensation (in shares)	69,834
Dividends and dividend equivalents					(12,348)				(12,348)
Shareholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2024	$ 687	$ 366,701	$ (178,974)		$ 1,725,337	$ 12,749	$ (405,748)		$ 1,520,752
Shares, Outstanding, Ending Balance at Mar. 31, 2024	45,709,881

XML

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement Of Shareholders Equity [Abstract]
Cash dividends paid per common share	$ 0.27	$ 0.26

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement Of Cash Flows [Abstract]
Net cash provided by operating activities	$ 70,946	$ 69,219
Purchase of:
Fixed income securities, available-for-sale	(120,109)	(180,040)
Equity securities	(17,302)	(6,395)
Property and equipment	(1,089)	(1,277)
Other	(2,664)	(1,392)
Proceeds from sale of:
Fixed income securities - available-for-sale	11,819	3,064
Equity securities	15,910	3,501
Equity method investee		14,134
Other	1,350	271
Proceeds from call or maturity of:
Fixed income securities - available-for-sale	71,284	190,303
Net proceeds from sale (purchase) of short-term investments	(12,263)	(79,973)
Net cash used in investing activities	(53,064)	(57,804)
Cash Flows from Financing Activities
Cash dividends paid	(12,337)	(11,839)
Proceeds from stock option exercises	2,588	375
Net cash used in financing activities	(9,749)	(11,464)
Net increase (decrease) in cash	8,133	(49)
Cash at the beginning of the period	36,424	22,818
Cash at March 31	$ 44,557	$ 22,769

XML

Basis of Presentation and Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Basis of Presentation and Summary of Significant Accounting Policies

NOTES TO UNAUDITED CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

A. BASIS OF PRESENTATION

The unaudited condensed consolidated interim financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (GAAP) for interim financial reporting and with the instructions to Form 10-Q and Regulation S-X. Accordingly, they do not include all the disclosures required by GAAP for complete financial statements. As such, these unaudited condensed consolidated interim financial statements should be read in conjunction with our 2023 Annual Report on Form 10-K. Management believes that the disclosures are adequate to make the information presented not misleading, and all normal and recurring adjustments necessary to present fairly the financial position at March 31, 2024 and the results of operations of RLI Corp. (the Company) and subsidiaries for all periods presented have been made. The results of operations for any interim period are not necessarily indicative of the operating results for a full year.

The preparation of the unaudited condensed consolidated interim financial statements requires management to make estimates and assumptions relating to the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated interim financial statements and the reported amounts of revenue and expenses during the period. These estimates are inherently subject to change and actual results could differ significantly from these estimates.

B. ADOPTED ACCOUNTING STANDARDS

No new accounting standards applicable in 2024 materially impact our financial statements.

C. PROSPECTIVE ACCOUNTING STANDARDS

2023-07—Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures

The guidance in ASU 2023-07 was designed to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Although the Company continues to evaluate the impact of adopting this new accounting standard, the amendments are disclosure-related and should not have a material impact on our financial statements.

2023-09—Income Taxes (Topic 740): Improvements to Income Tax Disclosures

The guidance in ASU 2023-09 was designed to increase transparency about income tax information through improvements to the rate reconciliation and disclosure of income taxes paid. This ASU is effective for fiscal years beginning after December 15, 2024. Although the Company continues to evaluate the impact of adopting this new accounting standard, the amendments are disclosure-related and should not have a material impact on our financial statements.

D. REINSURANCE

Ceded unearned premiums and reinsurance balances recoverable on unpaid losses and settlement expenses are reported separately as an asset, rather than being netted with the related liability, since reinsurance does not relieve the Company of our liability to policyholders. Such balances are subject to the credit risk associated with the individual reinsurer. We continually monitor the financial condition of our reinsurers and actively follow up on any past due or disputed amounts. As part of our monitoring efforts, we review reinsurers’ annual financial statements and Securities and Exchange Commission filings for those that are publicly traded. We also review insurance industry developments that may impact the financial condition of our reinsurers. We analyze the credit risk associated with our reinsurance balances recoverable by monitoring the AM Best and Standard & Poor’s (S&P) ratings of our reinsurers. In addition, we subject our reinsurance balances recoverable to detailed recoverability tests, including a segment-based analysis using the average default rating percentage by S&P rating, which assists the Company in assessing the sufficiency of its allowance. Additionally, we perform an in-depth reinsurer financial condition analysis prior to the renewal of our reinsurance placements.

Our policy is to charge to earnings, in the form of an allowance, an estimate of unrecoverable amounts from reinsurers. This allowance is reviewed on an ongoing basis to ensure that the amount makes a reasonable provision for reinsurance balances that we may be unable to recover. Once regulatory action (such as receivership, finding of insolvency, order of conservation or order of liquidation) is taken against a reinsurer, the paid and unpaid recoverable balances for the reinsurer are specifically identified and written off through use of our allowance for estimated unrecoverable amounts from reinsurers. When we write-off such a balance, it is done in full. We then re-evaluate the overall allowance and determine whether the balance is sufficient and, if needed, an additional allowance is recognized.

The allowances for uncollectible amounts on paid and unpaid reinsurance balances recoverable were $16 million and $11 million, respectively, at March 31, 2024 and December 31, 2023. Changes in the allowances were due to changes in the amount of reinsurance balances outstanding, the composition of reinsurers from whom the balances were recoverable and their associated S&P default ratings. No write-offs were applied to the allowances in the first three months of 2024 and less than $1 million was recovered.

E. INTANGIBLE ASSETS

The composition of goodwill and intangible assets at March 31, 2024 and December 31, 2023 is detailed in the following table:

	March 31,		December 31,
(in thousands)	2024		2023
Goodwill
Surety	$	40,816	$	40,816
Casualty		5,246		5,246
Total goodwill	$	46,062	$	46,062
Indefinite-lived intangibles		7,500		7,500
Total goodwill and intangibles	$	53,562	$	53,562

Annual impairment assessments were performed on our goodwill and state insurance license indefinite-lived intangible assets during the second quarter of 2023. Based upon these reviews, none of the assets were impaired. In addition, there were no triggering events as of March 31, 2024 that would suggest an updated impairment test would be needed for our goodwill and intangible assets.

F. EARNINGS PER SHARE

Basic earnings per share (EPS) is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the dilution that could occur if securities or other contracts to issue common stock or common stock equivalents were exercised or converted into common stock. When inclusion of these items increases the earnings per share or reduces the loss per share, the effect on earnings is anti-dilutive. Under these circumstances, the diluted net earnings or net loss per share is computed excluding these items. The following represents a reconciliation of the numerator and denominator of the basic and diluted EPS computations contained in the unaudited condensed consolidated interim financial statements:

	For the Three Months						For the Three Months
	Ended March 31, 2024						Ended March 31, 2023
	Income		Shares		Per Share		Income		Shares		Per Share
(in thousands, except per share data)	(Numerator)		(Denominator)		Amount		(Numerator)		(Denominator)		Amount
Basic EPS
Earnings available to common shareholders	$	127,900		45,684	$	2.80	$	98,811		45,530	$	2.17
Effect of Dilutive Securities
Stock options and restricted stock units		—		479				—		505
Diluted EPS
Earnings available to common shareholders	$	127,900		46,163	$	2.77	$	98,811		46,035	$	2.15
Anti-dilutive securities excluded from diluted EPS				—						—

G. COMPREHENSIVE EARNINGS

Our comprehensive earnings include net earnings plus after-tax unrealized gains and losses on our available-for-sale fixed income portfolio. In reporting the components of comprehensive earnings, we used the federal statutory tax rate of 21 percent. Other comprehensive earnings (loss), as shown in the consolidated statements of earnings and comprehensive earnings, is net of tax benefit of $3 million for the first quarter of 2024, compared to $10 million of tax expense for the same period in 2023.

Unrealized losses, net of tax, recognized in other comprehensive earnings (loss) were $13 million for the first three months of 2024, compared to $38 million of unrealized gains, net of tax, during the same period last year. The unrealized losses in the first quarter of 2024 were attributable to an increase in interest rates, which decreased the fair value of securities held in the fixed income portfolio, compared to declining interest rates during the first quarter of 2023, which increased the fair value of fixed income securities.

The following table illustrates the changes in the balance of each component of accumulated other comprehensive earnings (loss) for each period presented in the unaudited condensed consolidated interim financial statements:

(in thousands)	For the Three Months
	Ended March 31,
Unrealized Gains/Losses on Available-for-Sale Securities	2024		2023
Beginning balance	$	(166,303)	$	(229,076)
Other comprehensive earnings (loss) before reclassifications		(13,275)		36,254
Amounts reclassified from accumulated other comprehensive earnings		604		1,453
Net current-period other comprehensive earnings (loss)	$	(12,671)	$	37,707
Ending balance	$	(178,974)	$	(191,369)
Balance of securities for which an allowance for credit losses has been recognized in net earnings	$	904	$	1,841

Credit losses on or the sale of an available-for-sale security results in amounts being reclassified from accumulated other comprehensive earnings (loss) to current period net earnings. The effects of reclassifications out of accumulated other comprehensive earnings (loss) by the respective line items of net earnings are presented in the following table:

	Amount Reclassified from Accumulated Other
(in thousands)	Comprehensive Earnings (Loss)
	For the Three Months
Component of Accumulated	Ended March 31,				Affected line item in the
Other Comprehensive Earnings (Loss)	2024		2023		Statement of Earnings
Unrealized gains and losses on available-for-sale securities	$	(834)	$	(1,713)	Net realized gains (losses)
		70		(126)	Credit gains (losses) presented within net realized gains
	$	(764)	$	(1,839)	Earnings (loss) before income taxes
		160		386	Income tax (expense) benefit
	$	(604)	$	(1,453)	Net earnings (loss)

H. FAIR VALUE MEASUREMENTS

Fair value is defined as the price in the principal market that would be received for an asset to facilitate an orderly transaction between market participants on the measurement date. We determined the fair value of certain financial instruments based on their underlying characteristics and relevant transactions in the marketplace. We maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.

The following are the levels of the fair value hierarchy and a brief description of the type of valuation inputs that are used to establish each level. Financial assets are classified based upon the lowest level of significant input that is used to determine fair value.

Level 1 is applied to valuations based on readily available, unadjusted quoted prices in active markets for identical assets.

Level 2 is applied to valuations based upon quoted prices for similar assets in active markets, quoted prices for identical or similar assets in inactive markets; or valuations based on models where the significant inputs are observable (e.g. interest rates, yield curves, prepayment speeds, default rates, loss severities) or can be corroborated by observable market data.

Level 3 is applied to valuations that are derived from techniques in which one or more of the significant inputs are unobservable.

As a part of management’s process to determine fair value, we utilize widely recognized, third-party pricing sources to determine our fair values. We have obtained an understanding of the third-party pricing sources’ valuation methodologies and inputs. The following is a description of the valuation techniques used for financial assets that are measured at fair value, including the general classification of such assets pursuant to the fair value hierarchy.

Corporate, Agencies, Government and Municipal Bonds: The pricing vendor employs a multi-dimensional model which uses standard inputs including (listed in approximate order of priority for use) benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, market bids/offers and other reference data. The pricing vendor also monitors market indicators, as well as industry and economic events. All bonds valued using these techniques are classified as Level 2. All corporate, agency, government and municipal securities are deemed Level 2.

Mortgage-backed Securities (MBS)/Commercial Mortgage-backed Securities (CMBS) and Asset-backed Securities (ABS): The pricing vendor evaluation methodology primarily includes interest rate movements and new issue data. Evaluation of the tranches (non-volatile, volatile or credit sensitivity) is based on the pricing vendors’ interpretation of accepted modeling and pricing conventions. This information is then used to determine the cash flows for each tranche, benchmark yields, pre-payment assumptions and to incorporate collateral performance. To evaluate MBS and CMBS volatility, an option adjusted spread model is used in combination with models that simulate interest rate paths to determine market price information. This process allows the pricing vendor to obtain evaluations of a broad universe of securities in a way that reflects changes in yield curve, index rates, implied volatility, mortgage rates and recent trade activity. MBS/CMBS and ABS with corroborated, observable inputs are classified as Level 2. All of our MBS/CMBS and ABS are deemed Level 2.

Regulation D Private Placement Securities: All Regulation D privately-placed bonds are classified as corporate securities and deemed Level 3. The pricing vendor evaluation methodology for these securities includes a combination of observable and unobservable inputs. Observable inputs include public corporate spread matrices classified by sector, rating and average life, as well as investment and non-investment grade matrices created from fixed income indices. Unobservable inputs include a liquidity spread premium calculated based on public corporate spread and private corporate spread matrices. The quantitative detail of the liquidity spread premium is neither provided nor reasonably available to the Company. An increase to the credit spread assumptions would result in a lower fair value.

For all of our fixed income securities classified as Level 2, we periodically conduct a review to assess the reasonableness of the fair values provided by our pricing services. Our review consists of a two-pronged approach. First, we compare prices provided by our pricing services to those provided by an additional source. In some cases, we obtain prices from securities brokers and compare them to the prices provided by our pricing services. If discrepancies are found in our comparisons, we compare our prices to actual reported trade data for like securities. No changes to the fair values supplied by our pricing services have occurred as a result of our reviews. Based on these assessments, we have determined that the fair values of our Level 2 fixed income securities provided by our pricing services are reasonable.

Equity Securities: As of March 31, 2024, nearly all of our equity holdings were traded on an exchange. Exchange traded equities have readily observable price levels and are classified as Level 1 (fair value based on quoted market prices). Pricing for the equity securities not traded on an exchange is provided by a third-party pricing source using observable inputs and are classified as Level 2. Pricing for equity securities not traded on an exchange rely on one or more unobservable inputs and are classified as Level 3.

Due to the relatively short-term nature of cash, short-term investments, accounts receivable and accounts payable, their carrying amounts are reasonable estimates of fair value. Our investments in private funds, classified as other invested assets, are measured using the investments’ net asset value per share and are not categorized within the fair value hierarchy.

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Investments

3 Months Ended

Mar. 31, 2024

Investments Debt And Equity Securities [Abstract]

Investments

2. INVESTMENTS

Our investments are primarily composed of fixed income debt securities and common stock equity securities. We carry our equity securities at fair value and categorize all of our debt securities as available-for-sale, which are carried at fair value.

Realized gains and losses on disposition of investments are based on the specific identification of the investments sold on the settlement date. The following is a summary of the disposition of fixed income and equity securities for the three-month periods ended March 31, 2024 and 2023:

Sales	Proceeds		Gross Realized				Net Realized
(in thousands)	From Sales		Gains		Losses		Gain (Loss)
2024
Fixed income securities - available-for-sale	$	11,819	$	289	$	(793)	$	(504)
Equity securities		15,910		7,234		(121)		7,113
2023
Fixed income securities - available-for-sale	$	3,790	$	35	$	(82)	$	(47)
Equity securities		3,501		2,417		(101)		2,316
Calls/Maturities			Gross Realized				Net Realized
(in thousands)	Proceeds		Gains		Losses		Gain (Loss)
2024
Fixed income securities - available-for-sale	$	72,423	$	33	$	(157)	$	(124)
2023
Fixed income securities - available-for-sale	$	190,305	$	35	$	(40)	$	(5)

FAIR VALUE MEASUREMENTS

Assets measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023 are summarized below:

	As of March 31, 2024
	Quoted Prices in		Significant Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
(in thousands)	(Level 1)		(Level 2)		(Level 3)		Total
Fixed income securities - available-for-sale
U.S. government	$	—	$	329,559	$	—	$	329,559
U.S. agency		—		58,455		—		58,455
Non-U.S. government & agency		—		3,844		—		3,844
Agency MBS		—		414,428		—		414,428
ABS/CMBS/MBS*		—		289,476		—		289,476
Corporate		—		1,158,487		62,560		1,221,047
Municipal		—		546,512		—		546,512
Total fixed income securities - available-for-sale	$	—	$	2,800,761	$	62,560	$	2,863,321
Equity securities		641,758		—		1,609		643,367
Total	$	641,758	$	2,800,761	$	64,169	$	3,506,688

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

	As of December 31, 2023
	Quoted Prices in		Significant Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
(in thousands)	(Level 1)		(Level 2)		(Level 3)		Total
Fixed income securities - available-for-sale
U.S. government	$	—	$	308,031	$	—	$	308,031
U.S. agency		—		59,826		—		59,826
Non-U.S. government & agency		—		3,882		—		3,882
Agency MBS		—		425,285		—		425,285
ABS/CMBS/MBS*		—		281,182		—		281,182
Corporate		—		1,164,548		60,471		1,225,019
Municipal		—		552,624		—		552,624
Total fixed income securities - available-for-sale	$	—	$	2,795,378	$	60,471	$	2,855,849
Equity securities		588,416		—		1,625		590,041
Total	$	588,416	$	2,795,378	$	62,096	$	3,445,890

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

The following table summarizes changes in the balance of securities whose fair value was measured using significant unobservable inputs (Level 3).

(in thousands)	Level 3 Securities
Balance as of January 1, 2024	$	62,096
Net realized and unrealized gains (losses)
Included in other comprehensive earnings (loss)		(271)
Purchases		2,735
Sales / Calls / Maturities		(391)
Balance as of March 31, 2024	$	64,169
Change in unrealized gains (losses) during the period for Level 3 assets held at period-end - included in other comprehensive earnings (loss)	$	(271)

The amortized cost and fair value of available-for-sale fixed income securities by contractual maturity as of March 31, 2024 were as follows:

	March 31, 2024
(in thousands)	Amortized Cost		Fair Value
Due in one year or less	$	188,801	$	186,550
Due after one year through five years		875,943		843,536
Due after five years through 10 years		696,813		669,310
Due after 10 years		548,944		460,021
ABS/CMBS/MBS*		771,772		703,904
Total available-for-sale	$	3,082,273	$	2,863,321

* Asset-backed, commercial mortgage-backed and mortgage-backed securities

The amortized cost and fair value of available-for-sale securities at March 31, 2024 and December 31, 2023 are presented in the tables below. Amortized cost does not include the $24 million and $23 million of accrued interest receivable as of March 31, 2024 and December 31, 2023, respectively.

	March 31, 2024
	Cost or		Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
(in thousands)	Cost		Losses		Gains		Losses		Value
U.S. government	$	337,014	$	—	$	388	$	(7,843)	$	329,559
U.S. agency		59,956		—		444		(1,945)		58,455
Non-U.S. government & agency		4,800		—		—		(956)		3,844
Agency MBS		456,358		—		1,208		(43,138)		414,428
ABS/CMBS/MBS*		315,414		(2)		970		(26,906)		289,476
Corporate		1,277,258		(235)		4,732		(60,708)		1,221,047
Municipal		631,473		—		1,413		(86,374)		546,512
Total Fixed Income	$	3,082,273	$	(237)	$	9,155	$	(227,870)	$	2,863,321
	December 31, 2023
	Cost or		Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
(in thousands)	Cost		Losses		Gains		Losses		Value
U.S. government	$	312,632	$	—	$	1,257	$	(5,858)	$	308,031
U.S. agency		60,763		—		652		(1,589)		59,826
Non-U.S. government & agency		4,800		—		—		(918)		3,882
Agency MBS		460,551		—		2,636		(37,902)		425,285
ABS/CMBS/MBS*		308,458		(3)		611		(27,884)		281,182
Corporate		1,273,187		(303)		8,766		(56,631)		1,225,019
Municipal		634,000		—		2,238		(83,614)		552,624
Total Fixed Income	$	3,054,391	$	(306)	$	16,160	$	(214,396)	$	2,855,849

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

Allowance for Credit Losses and Unrealized Losses on Fixed Income Securities

A reversable allowance for credit losses is recognized on available-for-sale fixed income securities. Several criteria are reviewed to determine if securities in the fixed income portfolio should be included in the allowance for expected credit loss evaluation, including:

● Changes in technology that may impair the earnings potential of the investment,

● The discontinuance of a segment of business that may affect future earnings potential,

● Reduction of or non-payment of interest and/or principal,

● Specific concerns related to the issuer’s industry or geographic area of operation,

● Significant or recurring operating losses, poor cash flows and/or deteriorating liquidity ratios and

● Downgrades in credit quality by a major rating agency.

If changes in interest rates and credit spreads do not reasonably explain the unrealized loss for an available-for-sale security, or if any of the criteria above indicate a potential credit loss, the security is subjected to a discounted cash flow analysis. Inputs into the discounted cash flow analysis include prepayment assumptions for structured securities, default rates and recoverability rates based on credit rating. The allowance for any security is limited to the amount that the security’s fair value is below amortized cost. As of March 31, 2024, the discounted cash flow analysis resulted in an allowance for credit losses on 11 securities. The following table presents changes in the allowance for expected credit losses on available-for-sale securities:

	Three Months Ended March 31,
(in thousands)	2024		2023
Beginning balance	$	306	$	339
Increase to allowance from securities for which credit losses were not previously recorded		12		54
Reduction from securities sold during the period		(67)		—
Net increase (decrease) from securities that had an allowance at the beginning of the period		(14)		72
Balance as of March 31,	$	237	$	465

We recognized $2 million of losses on securities for which we no longer had the intent to hold until recovery during the first three months of 2023. No such losses were recognized during the first three months of 2024.

As of March 31, 2024, in addition to the securities included in the allowance for credit losses, the fixed income portfolio contained 1,336 securities with an unrealized loss position for which an allowance for credit losses had not been recorded. The $228 million in associated unrealized losses represents 7 percent of the fixed income portfolio’s cost basis and 6 percent of total invested assets. Isolated to these securities, unrealized losses increased slightly through the first three months of 2024, as interest rates increased during the period. Of the total 1,336 securities, 1,135 have been in an unrealized loss position for 12 consecutive months or longer. The following table illustrates the total value of fixed income securities that were in an unrealized loss position as of March 31, 2024 and December 31, 2023 after factoring in the allowance for credit losses. All fixed income securities continue to pay the expected coupon payments and we believe we will recover the amortized cost basis of available-for-sale securities that remain in an unrealized loss position.

	March 31, 2024						December 31, 2023
(in thousands)	< 12 Mos.		12 Mos. & Greater		Total		< 12 Mos.		12 Mos. & Greater		Total
U.S. government
Fair value	$	78,413	$	203,962	$	282,375	$	37,718	$	204,556	$	242,274
Amortized cost		79,565		210,653		290,218		37,950		210,182		248,132
Unrealized loss	$	(1,152)	$	(6,691)	$	(7,843)	$	(232)	$	(5,626)	$	(5,858)
U.S. agency
Fair value	$	15,822	$	28,854	$	44,676	$	8,736	$	29,632	$	38,368
Amortized cost		15,995		30,626		46,621		8,790		31,167		39,957
Unrealized loss	$	(173)	$	(1,772)	$	(1,945)	$	(54)	$	(1,535)	$	(1,589)
Non-U.S. government
Fair value	$	—	$	3,844	$	3,844	$	—	$	3,882	$	3,882
Amortized cost		—		4,800		4,800		—		4,800		4,800
Unrealized Loss	$	—	$	(956)	$	(956)	$	—	$	(918)	$	(918)
Agency MBS
Fair value	$	55,007	$	288,704	$	343,711	$	61,196	$	275,707	$	336,903
Amortized cost		56,100		330,749		386,849		61,714		313,091		374,805
Unrealized loss	$	(1,093)	$	(42,045)	$	(43,138)	$	(518)	$	(37,384)	$	(37,902)
ABS/CMBS/MBS*
Fair value	$	25,663	$	182,583	$	208,246	$	12,240	$	211,436	$	223,676
Amortized cost		25,831		209,321		235,152		12,367		239,193		251,560
Unrealized loss	$	(168)	$	(26,738)	$	(26,906)	$	(127)	$	(27,757)	$	(27,884)
Corporate
Fair value	$	185,542	$	795,631	$	981,173	$	67,402	$	822,731	$	890,133
Amortized cost		188,580		853,301		1,041,881		68,345		878,419		946,764
Unrealized loss	$	(3,038)	$	(57,670)	$	(60,708)	$	(943)	$	(55,688)	$	(56,631)
Municipal
Fair value	$	74,207	$	418,819	$	493,026	$	61,218	$	391,361	$	452,579
Amortized cost		75,247		504,153		579,400		61,697		474,496		536,193
Unrealized loss	$	(1,040)	$	(85,334)	$	(86,374)	$	(479)	$	(83,135)	$	(83,614)
Total fixed income
Fair value	$	434,654	$	1,922,397	$	2,357,051	$	248,510	$	1,939,305	$	2,187,815
Amortized cost		441,318		2,143,603		2,584,921		250,863		2,151,348		2,402,211
Unrealized loss	$	(6,664)	$	(221,206)	$	(227,870)	$	(2,353)	$	(212,043)	$	(214,396)

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

The following table shows the composition of the fixed income securities in unrealized loss positions, after factoring in the allowance for credit losses, at March 31, 2024 by the National Association of Insurance Commissioners (NAIC) rating and the generally equivalent Standard & Poor’s (S&P) and Moody’s ratings. The vast majority of the securities are rated by S&P and/or Moody’s.

	Equivalent	Equivalent	(dollars in thousands)
NAIC	S&P	Moody’s	Amortized				Unrealized		Percent
Rating	Rating	Rating	Cost		Fair Value		Loss		to Total
1	AAA/AA/A	Aaa/Aa/A	$	2,137,898	$	1,941,077	$	(196,821)	86.4	%
2	BBB	Baa		397,220		369,097		(28,123)	12.3	%
3	BB	Ba		31,428		29,952		(1,476)	0.7	%
4	B	B		14,826		14,073		(753)	0.3	%
5	CCC	Caa		2,730		2,421		(309)	0.1	%
6	CC or lower	Ca or lower		819		431		(388)	0.2	%
		Total	$	2,584,921	$	2,357,051	$	(227,870)	100.0	%

Other Invested Assets

We had $59 million of other invested assets at March 31, 2024, compared to $59 million at December 31, 2023. Other invested assets include investments in low income housing tax credit partnerships (LIHTC) and historic tax credit partnerships (HTC), membership in the Federal Home Loan Bank of Chicago (FHLBC), and investments in private funds. Our LIHTC and

HTC investments are carried at amortized cost and our investment in FHLBC stock is carried at cost. Due to the nature of the LIHTC, HTC and our membership in the FHLBC, their carrying amounts approximate fair value. The private funds are carried at fair value, using each investment’s net asset value.

Our LIHTC interests had a balance of $9 million at March 31, 2024, compared to $10 million on December 31, 2023. Our LIHTC interests recognized amortization of $1 million as a component of income tax expense and a total tax benefit of $1 million during the first quarter of 2024 and 2023. Our unfunded commitment for our LIHTC investments was less than $1 million at March 31, 2024 and will be paid out in installments through 2035.

Our HTC investment had a balance of $12 million at March 31, 2024, compared to $13 million at December 31, 2023. Our HTC investment recognized $1 million of amortization as a component of income tax expense and a total tax benefit of $1 million during the first quarter of 2024 and 2023.

As of March 31, 2024, $57 million of investments were pledged as collateral with the FHLBC to ensure timely access to the secured lending facility that ownership of FHLBC stock provides. As of March 31, 2024, $50 million of borrowings were outstanding with the FHLBC.

Our investments in private funds totaled $27 million as of March 31, 2024, down from $28 million as of December 31, 2023, and had $4 million of associated unfunded commitments at March 31, 2024. Our interest in private funds is generally restricted from being transferred or otherwise redeemed without prior consent by the respective entities, and the timed dissolution of the partnerships would trigger redemption.

Investments in Unconsolidated Investees

We had $66 million of investments in unconsolidated investees at March 31, 2024, compared to $57 million at December 31, 2023. At March 31, 2024, our investment in Prime Holdings Insurance Services, Inc. (Prime) was $66 million and other investments in unconsolidated investees totaled less than $1 million.

Cash and Short-Term Investments

Cash consists of uninvested balances in bank accounts. Short-term investments consist of investments with original maturities of 90 days or less, primarily AAA-rated government money market funds. Short-term investments are carried at cost. We had a cash and short-term investment balance of $45 million and $147 million, respectively, at March 31, 2024, compared to $36 million and $135 million, respectively, at December 31, 2023.

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Historical Loss And LAE Development

3 Months Ended

Mar. 31, 2024

Historical Loss And L A E Development Disclosure [Abstract]

Historical Loss And LAE Development

3. HISTORICAL LOSS AND LAE DEVELOPMENT

The following table is a reconciliation of our unpaid losses and settlement expenses (LAE) for the first three months of 2024 and 2023:

	For the Three Months
	Ended March 31,
(in thousands)	2024		2023
Unpaid losses and LAE at beginning of year
Gross	$	2,446,025	$	2,315,637
Ceded		(757,349)		(740,089)
Net	$	1,688,676	$	1,575,548
Increase (decrease) in incurred losses and LAE
Current accident year	$	186,217	$	166,270
Prior accident years		(42,393)		(51,782)
Total incurred	$	143,824	$	114,488
Loss and LAE payments for claims incurred
Current accident year	$	(12,975)	$	(7,983)
Prior accident years		(102,011)		(95,905)
Total paid	$	(114,986)	$	(103,888)
Net unpaid losses and LAE at March 31,	$	1,717,514	$	1,586,148
Unpaid losses and LAE at March 31,
Gross	$	2,532,190	$	2,286,063
Ceded		(814,676)		(699,915)
Net	$	1,717,514	$	1,586,148

For the first three months of 2024, incurred losses and LAE included $42 million of favorable development on prior years’ loss reserves, largely from accident years 2016 through 2019 and 2023. Marine, commercial property, personal umbrella, general liability, executive products, transportation and surety were drivers of the favorable development. No products experienced significant adverse development.

For the first three months of 2023, incurred losses and LAE included $52 million of favorable development on prior years’ loss reserves, largely from accident years 2016 and 2018 through 2022. Marine, general liability, professional services, commercial excess, executive products, personal umbrella, surety and commercial property were drivers of the favorable development. No products experienced significant adverse development.

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Income Taxes

3 Months Ended

Mar. 31, 2024

Income Tax Disclosure

Income Taxes

4. INCOME TAXES

Our effective tax rate for the three months ended March 31, 2024 was 20.1 percent, compared to 19.5 percent for the same period in 2023. Effective rates are dependent upon components of pretax earnings and the related tax effects. The effective tax rate was higher for the three-month period in 2024, as higher pretax income decreased the percentage impact of tax-favored adjustments.

Income tax expense attributable to income from operations for the three-month period ended March 31, 2024 and 2023 differed from the amounts computed by applying the U.S. federal tax rate of 21 percent to pretax income by the items detailed in the below table. In interim periods, income taxes are adjusted to reflect the effective tax rate we anticipate for the year, with adjustments flowing through the other items, net line.

	For the Three Months Ended March 31,
	2024				2023
(in thousands)	Amount		%		Amount		%
Provision for income taxes at the statutory rate of 21%	$	33,598	21.0	%	$	25,786	21.0	%
Increase (reduction) in taxes resulting from:
Excess tax benefit on share-based compensation		(1,874)	(1.2)	%		(1,990)	(1.6)	%
Tax exempt interest income		(260)	(0.2)	%		(283)	(0.2)	%
Dividends received deduction		(235)	(0.1)	%		(224)	(0.2)	%
Tax credit		(768)	(0.5)	%		(513)	(0.4)	%
ESOP dividends paid deduction		(138)	(0.1)	%		(137)	(0.1)	%
Nondeductible expenses		713	0.4	%		601	0.5	%
Other items, net		1,055	0.8	%		740	0.5	%
Total tax expense	$	32,091	20.1	%	$	23,980	19.5	%

We have recorded our deferred tax assets and liabilities using the statutory federal tax rate of 21 percent. We believe it is more likely than not that all deferred tax assets will be recovered, given the carry back availability as well as the result of future operations, which we believe will generate sufficient taxable income to realize the deferred tax asset.

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Stock Based Compensation

3 Months Ended

Mar. 31, 2024

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Based Compensation

5. STOCK BASED COMPENSATION

Our RLI Corp. Long-Term Incentive Plan (2015 LTIP) was in place from 2015 to 2023. The 2015 LTIP provided for equity-based compensation, including stock options and restricted stock units, up to a maximum of 4,000,000 shares of common stock (subject to adjustment for changes in our capitalization and other events). Between 2015 and 2023, we granted 3,291,388 awards under the 2015 LTIP. The 2015 LTIP was replaced in 2023.

In 2023, our shareholders approved the 2023 RLI Corp. Long-Term Incentive Plan (2023, LTIP), which provides for equity-based compensation. In conjunction with the adoption of the 2023 LTIP, effective May 4, 2023, awards are no longer granted under the 2015 LTIP. Awards under the 2023 LTIP may be in the form of restricted stock, restricted stock units, stock options (incentive or non-qualified), stock appreciation rights, performance units as well as other stock-based awards. Eligibility under the 2023 LTIP is limited to employees, directors, consultants and independent contractors of the Company or any affiliate. The granting of awards under the 2023 LTIP is solely at the discretion of the Human Capital and Compensation Committee of the board of directors or its delegate. The maximum number of shares of common stock available for distribution under the 2023 LTIP is 4,004,891 shares (subject to adjustment for changes in our capitalization and other events). Since the plan’s approval in 2023, we have granted 224,013 awards under the 2023 LTIP, including 28,475 thus far in 2024.

Compensation expense is based on the probable number of awards expected to vest. The total compensation expense related to equity awards was $1.8 million in the three-month period ended March 31, 2024, compared to $2.5 million for the same period in 2023. The total income tax benefit was $0.3 million for the three-month period ended March 31, 2024, compared to $0.4 million for the same period in 2023. Total unrecognized compensation expense relating to outstanding and unvested awards was $5 million, which will be recognized over the weighted average vesting period of 2.63 years.

Stock Options

Under the 2023 LTIP, as under the 2015 LTIP, we grant stock options for shares with an exercise price equal to the fair market value of the shares at the date of grant (subject to adjustments for changes in our capitalization, special dividends and other events as set forth in such plans). Options generally vest and become exercisable over a five-year period and expire eight years after grant.

For most participants, the requisite service period and vesting period will be the same. For participants who are retirement eligible, defined by the plan as those individuals whose age and years of service equals 75 or greater, the requisite service period is deemed to be met and options are immediately expensed on the date of grant. For participants who will become retirement eligible during the vesting period, the requisite service period over which expense is recognized is the period between the grant date and the attainment of retirement eligibility. Shares issued upon option exercise are newly issued shares.

The following tables summarize option activity for the three-month period ended March 31, 2024:

				Weighted	Aggregate
		Weighted		Average	Intrinsic
		Average		Remaining	Value
	Options	Exercise Price		Contractual Life	(in 000’s)
Outstanding options at January 1, 2024	1,641,710	$	92.62
Options granted	27,875		135.94
Options exercised	(93,470)		64.52
Options canceled/forfeited	(1,365)		109.50
Outstanding options at March 31, 2024	1,574,750	$	95.04	4.58	$	84,145
Exercisable options at March 31, 2024	819,591	$	80.95	3.44	$	55,335

The intrinsic value of options exercised, which is the difference between the fair value and the exercise price, was $8 million and $11 million during the first three months of 2024 and 2023, respectively.

The fair value of options was estimated using a Black-Scholes based option pricing model with the following weighted average grant-date assumptions and weighted average fair values as of March 31:

	2024			2023
Weighted-average fair value of grants	$	30.60		$	27.04
Risk-free interest rates		4.62	%		4.22	%
Dividend yield		2.24	%		2.54	%
Expected volatility		23.05	%		22.93	%
Expected option life		5.08	years		5.01	years

The risk-free rate was determined based on U.S. treasury yields that most closely approximated the options’ expected life. The dividend yield was determined based on the average annualized quarterly dividends paid during the most recent five-year period and incorporated a consideration for special dividends paid in recent history. The expected volatility was calculated based on the median of the rolling volatilities for the expected life of the options. The expected option life was determined based on historical exercise behavior and the assumption that all outstanding options will be exercised at the midpoint of the current date and remaining contractual term, adjusted for the demographics of the current year’s grant.

Restricted Stock Units

In addition to stock options, restricted stock units (RSUs) are granted with a value equal to the closing stock price of the Company’s stock on the dates the units are granted. For employees, these units generally have a three-year cliff vesting, but have an accelerated vesting feature for participants who are retirement eligible, defined by the plan as those individuals whose age and years of service equals 75 or greater. For directors, these units vest on the earlier of one year from the date of grant or the next annual shareholders meeting. In addition, the RSUs have dividend participation, which accrue as additional units and are settled with granted stock units at the end of the vesting period.

		Weighted
		Average
		Grant Date
	RSUs	Fair Value
Nonvested at January 1, 2024	45,093	$	125.16
Granted	600		142.08
Reinvested	85		145.36
Forfeited	(128)		124.07
Nonvested at March 31, 2024	45,650	$	125.43

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Operating Segment Information

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Operating Segment Information

6. OPERATING SEGMENT INFORMATION

Selected information by operating segment is presented in the table below. Additionally, the table reconciles segment totals to total earnings and total revenues.

	For the Three Months
Revenues	Ended March 31,
(in thousands)	2024		2023
Casualty	$	198,276	$	186,031
Property		129,411		88,767
Surety		32,989		32,925
Net premiums earned	$	360,676	$	307,723
Net investment income		32,847		27,084
Net realized gains		5,994		14,620
Net unrealized gains on equity securities		45,314		15,496
Total consolidated revenue	$	444,831	$	364,923
Net Earnings
(in thousands)	2024		2023
Casualty	$	13,674	$	31,831
Property		57,716		28,383
Surety		6,305		7,676
Net underwriting income	$	77,695	$	67,890
Net investment income		32,847		27,084
Net realized gains		5,994		14,620
Net unrealized gains on equity securities		45,314		15,496
General corporate expense and interest on debt		(6,628)		(6,222)
Equity in earnings of unconsolidated investees		4,769		3,923
Earnings before income taxes	$	159,991	$	122,791
Income tax expense		32,091		23,980
Net earnings	$	127,900	$	98,811

The following table further summarizes revenues by major product type within each operating segment:

	For the Three Months
Net Premiums Earned	Ended March 31,
(in thousands)	2024		2023
Casualty
Commercial excess and personal umbrella	$	80,035	$	67,582
Commercial transportation		27,301		25,232
General liability		25,412		25,900
Professional services		25,085		24,357
Small commercial		18,337		17,941
Executive products		5,915		6,353
Other casualty		16,191		18,666
Total	$	198,276	$	186,031
Property
Commercial property	$	87,605	$	49,262
Marine		32,568		30,636
Other property		9,238		8,869
Total	$	129,411	$	88,767
Surety
Transactional	$	12,108	$	12,047
Commercial		10,625		12,418
Contract		10,256		8,460
Total	$	32,989	$	32,925
Grand Total	$	360,676	$	307,723

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Leases

3 Months Ended

Mar. 31, 2024

Leases [Abstract]

Leases

7. LEASES

Right-of-use (ROU) assets are included in the other assets line item and lease liabilities are included in the other liabilities line item of the consolidated balance sheet. We determine if a contract contains a lease at inception and recognize operating lease ROU assets and operating lease liabilities based on the present value of the future minimum lease payments at the commencement date. As our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of future payments. Lease agreements may include options to extend or terminate. The options are exercised at our discretion and are included in operating lease liabilities if it is reasonably certain the option will be exercised. Lease agreements have lease and non-lease components, which are accounted for as a single lease component. Operating lease costs for future minimum lease payments are recognized on a straight-line basis over the lease terms. Variable lease costs are expensed in the period in which the obligations are incurred. Sublease income is recognized on a straight-line basis over the sublease term.

The Company’s operating lease obligations are for branch office facilities. The components of lease expense and other lease information as of and during the three-month periods ended March 31, 2024 and 2023 were as follows:

	For the Three Months
	Ended March 31,
(in thousands)	2024		2023
Operating lease cost	$	1,181	$	1,269
Variable lease cost		269		438
Sublease income		(42)		(139)
Total lease cost	$	1,408	$	1,568
Cash paid for amounts included in measurement of lease liabilities
Operating cash outflows from operating leases	$	1,063	$	1,398
ROU assets obtained in exchange for new operating lease liabilities	$	3,456	$	41
Reduction to ROU assets resulting from reduction to lease liabilities	$	—	$	200

(in thousands)	March 31, 2024			December 31, 2023
Operating lease ROU assets	$	16,083		$	13,666
Operating lease liabilities	$	17,415		$	14,880
Weighted-average remaining lease term - operating leases		6.16	years		6.08	years
Weighted-average discount rate - operating leases		3.48	%		3.21	%

Future minimum lease payments under non-cancellable leases as of March 31, 2024 were as follows:

(in thousands)	March 31, 2024
2024	$	3,248
2025		4,048
2026		3,256
2027		2,135
2028		1,544
2029		1,450
Thereafter		4,199
Total future minimum lease payments	$	19,880
Less imputed interest		(2,465)
Total operating lease liability	$	17,415

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Acquisitions and Dispositions

3 Months Ended

Mar. 31, 2024

Business Combination and Asset Acquisition [Abstract]

Acquisitions and Dispositions

8. ACQUISITONS AND DISPOSTIONS

On September 30, 2022, RLI Corp. completed the sale of its equity method investment in Maui Jim, Inc. to Kering Eyewear. During the first quarter of 2023, the payout of the working capital escrow resulted in the recognition of a $14 million gain that was recorded in the net realized gain line item of the statement of earnings.

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Basis of Presentation and Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Basis of Presentation

A. BASIS OF PRESENTATION

The unaudited condensed consolidated interim financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (GAAP) for interim financial reporting and with the instructions to Form 10-Q and Regulation S-X. Accordingly, they do not include all the disclosures required by GAAP for complete financial statements. As such, these unaudited condensed consolidated interim financial statements should be read in conjunction with our 2023 Annual Report on Form 10-K. Management believes that the disclosures are adequate to make the information presented not misleading, and all normal and recurring adjustments necessary to present fairly the financial position at March 31, 2024 and the results of operations of RLI Corp. (the Company) and subsidiaries for all periods presented have been made. The results of operations for any interim period are not necessarily indicative of the operating results for a full year.

The preparation of the unaudited condensed consolidated interim financial statements requires management to make estimates and assumptions relating to the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated interim financial statements and the reported amounts of revenue and expenses during the period. These estimates are inherently subject to change and actual results could differ significantly from these estimates.

Adopted Accounting Standards

B. ADOPTED ACCOUNTING STANDARDS

No new accounting standards applicable in 2024 materially impact our financial statements.

Prospective Accounting Standards

C. PROSPECTIVE ACCOUNTING STANDARDS

2023-07—Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures

The guidance in ASU 2023-07 was designed to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Although the Company continues to evaluate the impact of adopting this new accounting standard, the amendments are disclosure-related and should not have a material impact on our financial statements.

2023-09—Income Taxes (Topic 740): Improvements to Income Tax Disclosures

The guidance in ASU 2023-09 was designed to increase transparency about income tax information through improvements to the rate reconciliation and disclosure of income taxes paid. This ASU is effective for fiscal years beginning after December 15, 2024. Although the Company continues to evaluate the impact of adopting this new accounting standard, the amendments are disclosure-related and should not have a material impact on our financial statements.

Reinsurance

D. REINSURANCE

Ceded unearned premiums and reinsurance balances recoverable on unpaid losses and settlement expenses are reported separately as an asset, rather than being netted with the related liability, since reinsurance does not relieve the Company of our liability to policyholders. Such balances are subject to the credit risk associated with the individual reinsurer. We continually monitor the financial condition of our reinsurers and actively follow up on any past due or disputed amounts. As part of our monitoring efforts, we review reinsurers’ annual financial statements and Securities and Exchange Commission filings for those that are publicly traded. We also review insurance industry developments that may impact the financial condition of our reinsurers. We analyze the credit risk associated with our reinsurance balances recoverable by monitoring the AM Best and Standard & Poor’s (S&P) ratings of our reinsurers. In addition, we subject our reinsurance balances recoverable to detailed recoverability tests, including a segment-based analysis using the average default rating percentage by S&P rating, which assists the Company in assessing the sufficiency of its allowance. Additionally, we perform an in-depth reinsurer financial condition analysis prior to the renewal of our reinsurance placements.

Our policy is to charge to earnings, in the form of an allowance, an estimate of unrecoverable amounts from reinsurers. This allowance is reviewed on an ongoing basis to ensure that the amount makes a reasonable provision for reinsurance balances that we may be unable to recover. Once regulatory action (such as receivership, finding of insolvency, order of conservation or order of liquidation) is taken against a reinsurer, the paid and unpaid recoverable balances for the reinsurer are specifically identified and written off through use of our allowance for estimated unrecoverable amounts from reinsurers. When we write-off such a balance, it is done in full. We then re-evaluate the overall allowance and determine whether the balance is sufficient and, if needed, an additional allowance is recognized.

The allowances for uncollectible amounts on paid and unpaid reinsurance balances recoverable were $16 million and $11 million, respectively, at March 31, 2024 and December 31, 2023. Changes in the allowances were due to changes in the amount of reinsurance balances outstanding, the composition of reinsurers from whom the balances were recoverable and their associated S&P default ratings. No write-offs were applied to the allowances in the first three months of 2024 and less than $1 million was recovered.

Intangible Assets

E. INTANGIBLE ASSETS

The composition of goodwill and intangible assets at March 31, 2024 and December 31, 2023 is detailed in the following table:

	March 31,		December 31,
(in thousands)	2024		2023
Goodwill
Surety	$	40,816	$	40,816
Casualty		5,246		5,246
Total goodwill	$	46,062	$	46,062
Indefinite-lived intangibles		7,500		7,500
Total goodwill and intangibles	$	53,562	$	53,562

Annual impairment assessments were performed on our goodwill and state insurance license indefinite-lived intangible assets during the second quarter of 2023. Based upon these reviews, none of the assets were impaired. In addition, there were no triggering events as of March 31, 2024 that would suggest an updated impairment test would be needed for our goodwill and intangible assets.

Earnings Per Share

F. EARNINGS PER SHARE

Basic earnings per share (EPS) is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the dilution that could occur if securities or other contracts to issue common stock or common stock equivalents were exercised or converted into common stock. When inclusion of these items increases the earnings per share or reduces the loss per share, the effect on earnings is anti-dilutive. Under these circumstances, the diluted net earnings or net loss per share is computed excluding these items. The following represents a reconciliation of the numerator and denominator of the basic and diluted EPS computations contained in the unaudited condensed consolidated interim financial statements:

	For the Three Months						For the Three Months
	Ended March 31, 2024						Ended March 31, 2023
	Income		Shares		Per Share		Income		Shares		Per Share
(in thousands, except per share data)	(Numerator)		(Denominator)		Amount		(Numerator)		(Denominator)		Amount
Basic EPS
Earnings available to common shareholders	$	127,900		45,684	$	2.80	$	98,811		45,530	$	2.17
Effect of Dilutive Securities
Stock options and restricted stock units		—		479				—		505
Diluted EPS
Earnings available to common shareholders	$	127,900		46,163	$	2.77	$	98,811		46,035	$	2.15
Anti-dilutive securities excluded from diluted EPS				—						—

Comprehensive Earnings

G. COMPREHENSIVE EARNINGS

Our comprehensive earnings include net earnings plus after-tax unrealized gains and losses on our available-for-sale fixed income portfolio. In reporting the components of comprehensive earnings, we used the federal statutory tax rate of 21 percent. Other comprehensive earnings (loss), as shown in the consolidated statements of earnings and comprehensive earnings, is net of tax benefit of $3 million for the first quarter of 2024, compared to $10 million of tax expense for the same period in 2023.

Unrealized losses, net of tax, recognized in other comprehensive earnings (loss) were $13 million for the first three months of 2024, compared to $38 million of unrealized gains, net of tax, during the same period last year. The unrealized losses in the first quarter of 2024 were attributable to an increase in interest rates, which decreased the fair value of securities held in the fixed income portfolio, compared to declining interest rates during the first quarter of 2023, which increased the fair value of fixed income securities.

The following table illustrates the changes in the balance of each component of accumulated other comprehensive earnings (loss) for each period presented in the unaudited condensed consolidated interim financial statements:

(in thousands)	For the Three Months
	Ended March 31,
Unrealized Gains/Losses on Available-for-Sale Securities	2024		2023
Beginning balance	$	(166,303)	$	(229,076)
Other comprehensive earnings (loss) before reclassifications		(13,275)		36,254
Amounts reclassified from accumulated other comprehensive earnings		604		1,453
Net current-period other comprehensive earnings (loss)	$	(12,671)	$	37,707
Ending balance	$	(178,974)	$	(191,369)
Balance of securities for which an allowance for credit losses has been recognized in net earnings	$	904	$	1,841

Credit losses on or the sale of an available-for-sale security results in amounts being reclassified from accumulated other comprehensive earnings (loss) to current period net earnings. The effects of reclassifications out of accumulated other comprehensive earnings (loss) by the respective line items of net earnings are presented in the following table:

	Amount Reclassified from Accumulated Other
(in thousands)	Comprehensive Earnings (Loss)
	For the Three Months
Component of Accumulated	Ended March 31,				Affected line item in the
Other Comprehensive Earnings (Loss)	2024		2023		Statement of Earnings
Unrealized gains and losses on available-for-sale securities	$	(834)	$	(1,713)	Net realized gains (losses)
		70		(126)	Credit gains (losses) presented within net realized gains
	$	(764)	$	(1,839)	Earnings (loss) before income taxes
		160		386	Income tax (expense) benefit
	$	(604)	$	(1,453)	Net earnings (loss)

Fair Value Measurements

H. FAIR VALUE MEASUREMENTS

Fair value is defined as the price in the principal market that would be received for an asset to facilitate an orderly transaction between market participants on the measurement date. We determined the fair value of certain financial instruments based on their underlying characteristics and relevant transactions in the marketplace. We maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.

The following are the levels of the fair value hierarchy and a brief description of the type of valuation inputs that are used to establish each level. Financial assets are classified based upon the lowest level of significant input that is used to determine fair value.

Level 1 is applied to valuations based on readily available, unadjusted quoted prices in active markets for identical assets.

Level 2 is applied to valuations based upon quoted prices for similar assets in active markets, quoted prices for identical or similar assets in inactive markets; or valuations based on models where the significant inputs are observable (e.g. interest rates, yield curves, prepayment speeds, default rates, loss severities) or can be corroborated by observable market data.

Level 3 is applied to valuations that are derived from techniques in which one or more of the significant inputs are unobservable.

As a part of management’s process to determine fair value, we utilize widely recognized, third-party pricing sources to determine our fair values. We have obtained an understanding of the third-party pricing sources’ valuation methodologies and inputs. The following is a description of the valuation techniques used for financial assets that are measured at fair value, including the general classification of such assets pursuant to the fair value hierarchy.

Corporate, Agencies, Government and Municipal Bonds: The pricing vendor employs a multi-dimensional model which uses standard inputs including (listed in approximate order of priority for use) benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, market bids/offers and other reference data. The pricing vendor also monitors market indicators, as well as industry and economic events. All bonds valued using these techniques are classified as Level 2. All corporate, agency, government and municipal securities are deemed Level 2.

Mortgage-backed Securities (MBS)/Commercial Mortgage-backed Securities (CMBS) and Asset-backed Securities (ABS): The pricing vendor evaluation methodology primarily includes interest rate movements and new issue data. Evaluation of the tranches (non-volatile, volatile or credit sensitivity) is based on the pricing vendors’ interpretation of accepted modeling and pricing conventions. This information is then used to determine the cash flows for each tranche, benchmark yields, pre-payment assumptions and to incorporate collateral performance. To evaluate MBS and CMBS volatility, an option adjusted spread model is used in combination with models that simulate interest rate paths to determine market price information. This process allows the pricing vendor to obtain evaluations of a broad universe of securities in a way that reflects changes in yield curve, index rates, implied volatility, mortgage rates and recent trade activity. MBS/CMBS and ABS with corroborated, observable inputs are classified as Level 2. All of our MBS/CMBS and ABS are deemed Level 2.

Regulation D Private Placement Securities: All Regulation D privately-placed bonds are classified as corporate securities and deemed Level 3. The pricing vendor evaluation methodology for these securities includes a combination of observable and unobservable inputs. Observable inputs include public corporate spread matrices classified by sector, rating and average life, as well as investment and non-investment grade matrices created from fixed income indices. Unobservable inputs include a liquidity spread premium calculated based on public corporate spread and private corporate spread matrices. The quantitative detail of the liquidity spread premium is neither provided nor reasonably available to the Company. An increase to the credit spread assumptions would result in a lower fair value.

For all of our fixed income securities classified as Level 2, we periodically conduct a review to assess the reasonableness of the fair values provided by our pricing services. Our review consists of a two-pronged approach. First, we compare prices provided by our pricing services to those provided by an additional source. In some cases, we obtain prices from securities brokers and compare them to the prices provided by our pricing services. If discrepancies are found in our comparisons, we compare our prices to actual reported trade data for like securities. No changes to the fair values supplied by our pricing services have occurred as a result of our reviews. Based on these assessments, we have determined that the fair values of our Level 2 fixed income securities provided by our pricing services are reasonable.

Equity Securities: As of March 31, 2024, nearly all of our equity holdings were traded on an exchange. Exchange traded equities have readily observable price levels and are classified as Level 1 (fair value based on quoted market prices). Pricing for the equity securities not traded on an exchange is provided by a third-party pricing source using observable inputs and are classified as Level 2. Pricing for equity securities not traded on an exchange rely on one or more unobservable inputs and are classified as Level 3.

Due to the relatively short-term nature of cash, short-term investments, accounts receivable and accounts payable, their carrying amounts are reasonable estimates of fair value. Our investments in private funds, classified as other invested assets, are measured using the investments’ net asset value per share and are not categorized within the fair value hierarchy.

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Basis of Presentation and Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Schedule of Goodwill and Intangible Assets

	March 31,		December 31,
(in thousands)	2024		2023
Goodwill
Surety	$	40,816	$	40,816
Casualty		5,246		5,246
Total goodwill	$	46,062	$	46,062
Indefinite-lived intangibles		7,500		7,500
Total goodwill and intangibles	$	53,562	$	53,562

Schedule of Reconciliation of Numerator and Denominator of the Basic and Diluted Earnings Per Share Computations

	For the Three Months						For the Three Months
	Ended March 31, 2024						Ended March 31, 2023
	Income		Shares		Per Share		Income		Shares		Per Share
(in thousands, except per share data)	(Numerator)		(Denominator)		Amount		(Numerator)		(Denominator)		Amount
Basic EPS
Earnings available to common shareholders	$	127,900		45,684	$	2.80	$	98,811		45,530	$	2.17
Effect of Dilutive Securities
Stock options and restricted stock units		—		479				—		505
Diluted EPS
Earnings available to common shareholders	$	127,900		46,163	$	2.77	$	98,811		46,035	$	2.15
Anti-dilutive securities excluded from diluted EPS				—						—

Schedule of Changes in the Balance of Each Component of Accumulated Other Comprehensive Earnings (Loss)

(in thousands)	For the Three Months
	Ended March 31,
Unrealized Gains/Losses on Available-for-Sale Securities	2024		2023
Beginning balance	$	(166,303)	$	(229,076)
Other comprehensive earnings (loss) before reclassifications		(13,275)		36,254
Amounts reclassified from accumulated other comprehensive earnings		604		1,453
Net current-period other comprehensive earnings (loss)	$	(12,671)	$	37,707
Ending balance	$	(178,974)	$	(191,369)
Balance of securities for which an allowance for credit losses has been recognized in net earnings	$	904	$	1,841

Schedule of Effects of Reclassifications out of Accumulated Other Comprehensive Earnings (Loss)

	Amount Reclassified from Accumulated Other
(in thousands)	Comprehensive Earnings (Loss)
	For the Three Months
Component of Accumulated	Ended March 31,				Affected line item in the
Other Comprehensive Earnings (Loss)	2024		2023		Statement of Earnings
Unrealized gains and losses on available-for-sale securities	$	(834)	$	(1,713)	Net realized gains (losses)
		70		(126)	Credit gains (losses) presented within net realized gains
	$	(764)	$	(1,839)	Earnings (loss) before income taxes
		160		386	Income tax (expense) benefit
	$	(604)	$	(1,453)	Net earnings (loss)

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Investments (Tables)

3 Months Ended

Mar. 31, 2024

Investments Debt And Equity Securities [Abstract]

Schedule of Disposition of Fixed Income and Equity Securities

Sales	Proceeds		Gross Realized				Net Realized
(in thousands)	From Sales		Gains		Losses		Gain (Loss)
2024
Fixed income securities - available-for-sale	$	11,819	$	289	$	(793)	$	(504)
Equity securities		15,910		7,234		(121)		7,113
2023
Fixed income securities - available-for-sale	$	3,790	$	35	$	(82)	$	(47)
Equity securities		3,501		2,417		(101)		2,316
Calls/Maturities			Gross Realized				Net Realized
(in thousands)	Proceeds		Gains		Losses		Gain (Loss)
2024
Fixed income securities - available-for-sale	$	72,423	$	33	$	(157)	$	(124)
2023
Fixed income securities - available-for-sale	$	190,305	$	35	$	(40)	$	(5)

Fair Value, Assets Measured on Recurring Basis

	As of March 31, 2024
	Quoted Prices in		Significant Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
(in thousands)	(Level 1)		(Level 2)		(Level 3)		Total
Fixed income securities - available-for-sale
U.S. government	$	—	$	329,559	$	—	$	329,559
U.S. agency		—		58,455		—		58,455
Non-U.S. government & agency		—		3,844		—		3,844
Agency MBS		—		414,428		—		414,428
ABS/CMBS/MBS*		—		289,476		—		289,476
Corporate		—		1,158,487		62,560		1,221,047
Municipal		—		546,512		—		546,512
Total fixed income securities - available-for-sale	$	—	$	2,800,761	$	62,560	$	2,863,321
Equity securities		641,758		—		1,609		643,367
Total	$	641,758	$	2,800,761	$	64,169	$	3,506,688

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

	As of December 31, 2023
	Quoted Prices in		Significant Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
(in thousands)	(Level 1)		(Level 2)		(Level 3)		Total
Fixed income securities - available-for-sale
U.S. government	$	—	$	308,031	$	—	$	308,031
U.S. agency		—		59,826		—		59,826
Non-U.S. government & agency		—		3,882		—		3,882
Agency MBS		—		425,285		—		425,285
ABS/CMBS/MBS*		—		281,182		—		281,182
Corporate		—		1,164,548		60,471		1,225,019
Municipal		—		552,624		—		552,624
Total fixed income securities - available-for-sale	$	—	$	2,795,378	$	60,471	$	2,855,849
Equity securities		588,416		—		1,625		590,041
Total	$	588,416	$	2,795,378	$	62,096	$	3,445,890

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

Summary of Changes in Balance of Level 3 Securities

(in thousands)	Level 3 Securities
Balance as of January 1, 2024	$	62,096
Net realized and unrealized gains (losses)
Included in other comprehensive earnings (loss)		(271)
Purchases		2,735
Sales / Calls / Maturities		(391)
Balance as of March 31, 2024	$	64,169
Change in unrealized gains (losses) during the period for Level 3 assets held at period-end - included in other comprehensive earnings (loss)	$	(271)

Schedule of Contractual Maturity of Securities

	March 31, 2024
(in thousands)	Amortized Cost		Fair Value
Due in one year or less	$	188,801	$	186,550
Due after one year through five years		875,943		843,536
Due after five years through 10 years		696,813		669,310
Due after 10 years		548,944		460,021
ABS/CMBS/MBS*		771,772		703,904
Total available-for-sale	$	3,082,273	$	2,863,321

* Asset-backed, commercial mortgage-backed and mortgage-backed securities

Schedule of Amortized Cost and Fair Value of Available-for-sale Securities

	March 31, 2024
	Cost or		Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
(in thousands)	Cost		Losses		Gains		Losses		Value
U.S. government	$	337,014	$	—	$	388	$	(7,843)	$	329,559
U.S. agency		59,956		—		444		(1,945)		58,455
Non-U.S. government & agency		4,800		—		—		(956)		3,844
Agency MBS		456,358		—		1,208		(43,138)		414,428
ABS/CMBS/MBS*		315,414		(2)		970		(26,906)		289,476
Corporate		1,277,258		(235)		4,732		(60,708)		1,221,047
Municipal		631,473		—		1,413		(86,374)		546,512
Total Fixed Income	$	3,082,273	$	(237)	$	9,155	$	(227,870)	$	2,863,321
	December 31, 2023
	Cost or		Allowance		Gross		Gross
	Amortized		for Credit		Unrealized		Unrealized		Fair
(in thousands)	Cost		Losses		Gains		Losses		Value
U.S. government	$	312,632	$	—	$	1,257	$	(5,858)	$	308,031
U.S. agency		60,763		—		652		(1,589)		59,826
Non-U.S. government & agency		4,800		—		—		(918)		3,882
Agency MBS		460,551		—		2,636		(37,902)		425,285
ABS/CMBS/MBS*		308,458		(3)		611		(27,884)		281,182
Corporate		1,273,187		(303)		8,766		(56,631)		1,225,019
Municipal		634,000		—		2,238		(83,614)		552,624
Total Fixed Income	$	3,054,391	$	(306)	$	16,160	$	(214,396)	$	2,855,849

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

Schedule of Debt Securities Available-for-sale Allowance for Credit Loss

	Three Months Ended March 31,
(in thousands)	2024		2023
Beginning balance	$	306	$	339
Increase to allowance from securities for which credit losses were not previously recorded		12		54
Reduction from securities sold during the period		(67)		—
Net increase (decrease) from securities that had an allowance at the beginning of the period		(14)		72
Balance as of March 31,	$	237	$	465

Schedule of Securities in an Unrealized Loss Position Segregated by Type and Length of Time in an Unrealized Loss Position

	March 31, 2024						December 31, 2023
(in thousands)	< 12 Mos.		12 Mos. & Greater		Total		< 12 Mos.		12 Mos. & Greater		Total
U.S. government
Fair value	$	78,413	$	203,962	$	282,375	$	37,718	$	204,556	$	242,274
Amortized cost		79,565		210,653		290,218		37,950		210,182		248,132
Unrealized loss	$	(1,152)	$	(6,691)	$	(7,843)	$	(232)	$	(5,626)	$	(5,858)
U.S. agency
Fair value	$	15,822	$	28,854	$	44,676	$	8,736	$	29,632	$	38,368
Amortized cost		15,995		30,626		46,621		8,790		31,167		39,957
Unrealized loss	$	(173)	$	(1,772)	$	(1,945)	$	(54)	$	(1,535)	$	(1,589)
Non-U.S. government
Fair value	$	—	$	3,844	$	3,844	$	—	$	3,882	$	3,882
Amortized cost		—		4,800		4,800		—		4,800		4,800
Unrealized Loss	$	—	$	(956)	$	(956)	$	—	$	(918)	$	(918)
Agency MBS
Fair value	$	55,007	$	288,704	$	343,711	$	61,196	$	275,707	$	336,903
Amortized cost		56,100		330,749		386,849		61,714		313,091		374,805
Unrealized loss	$	(1,093)	$	(42,045)	$	(43,138)	$	(518)	$	(37,384)	$	(37,902)
ABS/CMBS/MBS*
Fair value	$	25,663	$	182,583	$	208,246	$	12,240	$	211,436	$	223,676
Amortized cost		25,831		209,321		235,152		12,367		239,193		251,560
Unrealized loss	$	(168)	$	(26,738)	$	(26,906)	$	(127)	$	(27,757)	$	(27,884)
Corporate
Fair value	$	185,542	$	795,631	$	981,173	$	67,402	$	822,731	$	890,133
Amortized cost		188,580		853,301		1,041,881		68,345		878,419		946,764
Unrealized loss	$	(3,038)	$	(57,670)	$	(60,708)	$	(943)	$	(55,688)	$	(56,631)
Municipal
Fair value	$	74,207	$	418,819	$	493,026	$	61,218	$	391,361	$	452,579
Amortized cost		75,247		504,153		579,400		61,697		474,496		536,193
Unrealized loss	$	(1,040)	$	(85,334)	$	(86,374)	$	(479)	$	(83,135)	$	(83,614)
Total fixed income
Fair value	$	434,654	$	1,922,397	$	2,357,051	$	248,510	$	1,939,305	$	2,187,815
Amortized cost		441,318		2,143,603		2,584,921		250,863		2,151,348		2,402,211
Unrealized loss	$	(6,664)	$	(221,206)	$	(227,870)	$	(2,353)	$	(212,043)	$	(214,396)

* Non-agency asset-backed, commercial mortgage-backed and mortgage-backed securities

Schedule of Credit Quality Indicators for Investments in Unrealized Loss Positions

	Equivalent	Equivalent	(dollars in thousands)
NAIC	S&P	Moody’s	Amortized				Unrealized		Percent
Rating	Rating	Rating	Cost		Fair Value		Loss		to Total
1	AAA/AA/A	Aaa/Aa/A	$	2,137,898	$	1,941,077	$	(196,821)	86.4	%
2	BBB	Baa		397,220		369,097		(28,123)	12.3	%
3	BB	Ba		31,428		29,952		(1,476)	0.7	%
4	B	B		14,826		14,073		(753)	0.3	%
5	CCC	Caa		2,730		2,421		(309)	0.1	%
6	CC or lower	Ca or lower		819		431		(388)	0.2	%
		Total	$	2,584,921	$	2,357,051	$	(227,870)	100.0	%

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Historical Loss And LAE Development (Tables)

3 Months Ended

Mar. 31, 2024

Historical Loss And L A E Development Disclosure [Abstract]

Schedule of Reconciliation of Unpaid Losses and Settlement Expenses (LAE)

	For the Three Months
	Ended March 31,
(in thousands)	2024		2023
Unpaid losses and LAE at beginning of year
Gross	$	2,446,025	$	2,315,637
Ceded		(757,349)		(740,089)
Net	$	1,688,676	$	1,575,548
Increase (decrease) in incurred losses and LAE
Current accident year	$	186,217	$	166,270
Prior accident years		(42,393)		(51,782)
Total incurred	$	143,824	$	114,488
Loss and LAE payments for claims incurred
Current accident year	$	(12,975)	$	(7,983)
Prior accident years		(102,011)		(95,905)
Total paid	$	(114,986)	$	(103,888)
Net unpaid losses and LAE at March 31,	$	1,717,514	$	1,586,148
Unpaid losses and LAE at March 31,
Gross	$	2,532,190	$	2,286,063
Ceded		(814,676)		(699,915)
Net	$	1,717,514	$	1,586,148

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2024

Income Tax Disclosure

Schedule of Reconciliation of Income Tax Expense Attributable to Income from Operations with Amounts Computed by Applying U.S. Federal Tax Rate to Pretax Income from Continuing Operations

	For the Three Months Ended March 31,
	2024				2023
(in thousands)	Amount		%		Amount		%
Provision for income taxes at the statutory rate of 21%	$	33,598	21.0	%	$	25,786	21.0	%
Increase (reduction) in taxes resulting from:
Excess tax benefit on share-based compensation		(1,874)	(1.2)	%		(1,990)	(1.6)	%
Tax exempt interest income		(260)	(0.2)	%		(283)	(0.2)	%
Dividends received deduction		(235)	(0.1)	%		(224)	(0.2)	%
Tax credit		(768)	(0.5)	%		(513)	(0.4)	%
ESOP dividends paid deduction		(138)	(0.1)	%		(137)	(0.1)	%
Nondeductible expenses		713	0.4	%		601	0.5	%
Other items, net		1,055	0.8	%		740	0.5	%
Total tax expense	$	32,091	20.1	%	$	23,980	19.5	%

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Stock Based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Option Activity

				Weighted	Aggregate
		Weighted		Average	Intrinsic
		Average		Remaining	Value
	Options	Exercise Price		Contractual Life	(in 000’s)
Outstanding options at January 1, 2024	1,641,710	$	92.62
Options granted	27,875		135.94
Options exercised	(93,470)		64.52
Options canceled/forfeited	(1,365)		109.50
Outstanding options at March 31, 2024	1,574,750	$	95.04	4.58	$	84,145
Exercisable options at March 31, 2024	819,591	$	80.95	3.44	$	55,335

Summary of Weighted Average Grant-date Assumptions and Weighted Average Fair Values

	2024			2023
Weighted-average fair value of grants	$	30.60		$	27.04
Risk-free interest rates		4.62	%		4.22	%
Dividend yield		2.24	%		2.54	%
Expected volatility		23.05	%		22.93	%
Expected option life		5.08	years		5.01	years

Schedule of Restricted Stock Units Activity

		Weighted
		Average
		Grant Date
	RSUs	Fair Value
Nonvested at January 1, 2024	45,093	$	125.16
Granted	600		142.08
Reinvested	85		145.36
Forfeited	(128)		124.07
Nonvested at March 31, 2024	45,650	$	125.43

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Operating Segment Information (Tables)

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Summary of Selected Information by Operating Segment

	For the Three Months
Revenues	Ended March 31,
(in thousands)	2024		2023
Casualty	$	198,276	$	186,031
Property		129,411		88,767
Surety		32,989		32,925
Net premiums earned	$	360,676	$	307,723
Net investment income		32,847		27,084
Net realized gains		5,994		14,620
Net unrealized gains on equity securities		45,314		15,496
Total consolidated revenue	$	444,831	$	364,923
Net Earnings
(in thousands)	2024		2023
Casualty	$	13,674	$	31,831
Property		57,716		28,383
Surety		6,305		7,676
Net underwriting income	$	77,695	$	67,890
Net investment income		32,847		27,084
Net realized gains		5,994		14,620
Net unrealized gains on equity securities		45,314		15,496
General corporate expense and interest on debt		(6,628)		(6,222)
Equity in earnings of unconsolidated investees		4,769		3,923
Earnings before income taxes	$	159,991	$	122,791
Income tax expense		32,091		23,980
Net earnings	$	127,900	$	98,811

Summary of Revenue by Major Product Type

	For the Three Months
Net Premiums Earned	Ended March 31,
(in thousands)	2024		2023
Casualty
Commercial excess and personal umbrella	$	80,035	$	67,582
Commercial transportation		27,301		25,232
General liability		25,412		25,900
Professional services		25,085		24,357
Small commercial		18,337		17,941
Executive products		5,915		6,353
Other casualty		16,191		18,666
Total	$	198,276	$	186,031
Property
Commercial property	$	87,605	$	49,262
Marine		32,568		30,636
Other property		9,238		8,869
Total	$	129,411	$	88,767
Surety
Transactional	$	12,108	$	12,047
Commercial		10,625		12,418
Contract		10,256		8,460
Total	$	32,989	$	32,925
Grand Total	$	360,676	$	307,723

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Leases (Tables)

3 Months Ended

Mar. 31, 2024

Leases [Abstract]

Schedule of Components of Lease Expense and Other lease Information

	For the Three Months
	Ended March 31,
(in thousands)	2024		2023
Operating lease cost	$	1,181	$	1,269
Variable lease cost		269		438
Sublease income		(42)		(139)
Total lease cost	$	1,408	$	1,568
Cash paid for amounts included in measurement of lease liabilities
Operating cash outflows from operating leases	$	1,063	$	1,398
ROU assets obtained in exchange for new operating lease liabilities	$	3,456	$	41
Reduction to ROU assets resulting from reduction to lease liabilities	$	—	$	200

(in thousands)	March 31, 2024			December 31, 2023
Operating lease ROU assets	$	16,083		$	13,666
Operating lease liabilities	$	17,415		$	14,880
Weighted-average remaining lease term - operating leases		6.16	years		6.08	years
Weighted-average discount rate - operating leases		3.48	%		3.21	%

Schedule of Future Minimum Lease Payments under Non-cancellable Leases

(in thousands)	March 31, 2024
2024	$	3,248
2025		4,048
2026		3,256
2027		2,135
2028		1,544
2029		1,450
Thereafter		4,199
Total future minimum lease payments	$	19,880
Less imputed interest		(2,465)
Total operating lease liability	$	17,415

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Basis of Presentation and Summary of Significant Accounting Policies - Reinsurance - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Reinsurance
Amount of allowance for uncollectible amounts on paid recoverables	$ 16,000,000	$ 16,000,000
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts	11,085,000	$ 10,608,000
Financing receivable, allowance for credit Loss, write-off	0
Maximum
Reinsurance
Financing receivable, allowance for credit loss, recovery	$ 1,000,000

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Basis of Presentation and Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Business Acquisition
Goodwill	$ 46,062,000	$ 46,062,000
Indefinite-lived intangibles	7,500,000	7,500,000
Total goodwill and intangibles	53,562,000	53,562,000
Goodwill and intangible asset impairment	0
Surety
Business Acquisition
Goodwill	40,816,000	40,816,000
Casualty
Business Acquisition
Goodwill	$ 5,246,000	$ 5,246,000

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Summary of Significant Accounting Policies - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Basic EPS, Income (Numerator)
Income available to common shareholders	$ 127,900	$ 98,811
Diluted EPS, Income (Numerator)
Income available to common shareholders	$ 127,900	$ 98,811
Basic EPS, Weighted Average Shares (Denominator)
Number of shares outstanding	45,684	45,530
Effect of Dilutive Securities, Shares (Denominator)
Stock options and restricted stock units	479	505
Diluted EPS, Weighted Average Shares (Denominator)
Number of shares outstanding	46,163	46,035
Basic EPS, Per Share Amount
Basic net earnings per share (in dollars per share)	$ 2.80	$ 2.17
Diluted EPS, Per Share Amount
Diluted earnings per share (in dollars per share)	$ 2.77	$ 2.15

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Basis of Presentation and Summary of Significant Accounting Policies - Comprehensive Earnings (Loss) - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
COMPREHENSIVE EARNINGS (LOSS)
Tax rate used (as a percent)	21.00%	21.00%
Other comprehensive earnings (loss), tax (benefit)	$ (3,000)	$ 10,000
Other comprehensive earnings (loss), net of tax	$ (12,671)	$ 37,707

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Summary of Significant Accounting Policies - Changes in the Balance of Each Component of Accumulated Other Comprehensive Earnings (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Changes in the balance of each component of accumulated other comprehensive earnings (loss)
Beginning balance	$ (166,303)
Other comprehensive earnings (loss)	(12,671)	$ 37,707
Ending balance	(178,974)
Unrealized Gains and Losses on Available-for-Sale Securities
Changes in the balance of each component of accumulated other comprehensive earnings (loss)
Beginning balance	(166,303)	(229,076)
Other comprehensive earnings (loss) before reclassifications	(13,275)	36,254
Amounts reclassified from accumulated other comprehensive earnings	604	1,453
Other comprehensive earnings (loss)	(12,671)	37,707
Ending balance	(178,974)	(191,369)
Balance of securities for which an allowance for credit losses has been recognized in net earnings	$ 904	$ 1,841

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Summary of Significant Accounting Policies - Effects of Reclassifications out of Accumulated Other Comprehensive Earnings (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss)
Earnings before income taxes	$ 159,991	$ 122,791
Income tax (expense) benefit	(32,091)	(23,980)
Net earnings	127,900	98,811
Unrealized Gains and Losses on Available-for-Sale Securities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss)
Net realized gains (losses) - Available-for-sale	(834)	(1,713)
Credit gains (losses) presented within net realized gains	70	(126)
Earnings before income taxes	(764)	(1,839)
Income tax (expense) benefit	160	386
Net earnings	$ (604)	$ (1,453)

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Investments - Disposition of Fixed Income and Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Summary of the disposition of fixed income and equity securities
Fixed income securities - available-for-sale	$ 11,819	$ 3,064
Fixed income securities - available-for-sale	71,284	190,303
Net Realized Gain (Loss) - Fixed income securities - available-for-sale	0	(2,000)
SALES
Summary of the disposition of fixed income and equity securities
Fixed income securities - available-for-sale	11,819	3,790
Gross Realized Gains - Fixed income securities - available-for-sale	289	35
Gross Realized Losses - Fixed income securities - available-for-sale	(793)	(82)
Net Realized Gain (Loss) - Fixed income securities - available-for-sale	(504)	(47)
Proceeds from Sales - Equity securities	15,910	3,501
Gross Realized Gains - Equity securities	7,234	2,417
Gross Realized Losses - Equity securities	(121)	(101)
Net Realized Gain (Loss) - Equity securities	7,113	2,316
Calls And Maturities Of Marketable Securities
Summary of the disposition of fixed income and equity securities
Fixed income securities - available-for-sale	72,423	190,305
Gross Realized Gains - Fixed income securities - available-for-sale	33	35
Gross Realized Losses - Fixed income securities - available-for-sale	(157)	(40)
Net Realized Gain (Loss) - Fixed income securities - available-for-sale	$ (124)	$ (5)

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Investments - Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets measured at Fair Value
Available-for-sale fixed income	$ 2,863,321	$ 2,855,849
Equity securities	643,367	590,041
U.S. government
Assets measured at Fair Value
Available-for-sale fixed income	329,559	308,031
U.S. Agency
Assets measured at Fair Value
Available-for-sale fixed income	58,455	59,826
Non-U.S. government & agency
Assets measured at Fair Value
Available-for-sale fixed income	3,844	3,882
Agency MBS
Assets measured at Fair Value
Available-for-sale fixed income	414,428	425,285
ABS/CMBS/MBS
Assets measured at Fair Value
Available-for-sale fixed income	289,476	281,182
Corporate Debt
Assets measured at Fair Value
Available-for-sale fixed income	1,221,047	1,225,019
Municipal
Assets measured at Fair Value
Available-for-sale fixed income	546,512	552,624
Fair Value Measured on Recurring Basis
Assets measured at Fair Value
Available-for-sale fixed income	2,863,321	2,855,849
Equity securities	643,367	590,041
Total assets at fair value	3,506,688	3,445,890
Fair Value Measured on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets measured at Fair Value
Equity securities	641,758	588,416
Total assets at fair value	641,758	588,416
Fair Value Measured on Recurring Basis | Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale fixed income	2,800,761	2,795,378
Total assets at fair value	2,800,761	2,795,378
Fair Value Measured on Recurring Basis | Significant Unobservable Inputs (Level 3)
Assets measured at Fair Value
Available-for-sale fixed income	62,560	60,471
Equity securities	1,609	1,625
Total assets at fair value	64,169	62,096
Fair Value Measured on Recurring Basis | U.S. government
Assets measured at Fair Value
Available-for-sale fixed income	329,559	308,031
Fair Value Measured on Recurring Basis | U.S. government | Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale fixed income	329,559	308,031
Fair Value Measured on Recurring Basis | U.S. Agency
Assets measured at Fair Value
Available-for-sale fixed income	58,455	59,826
Fair Value Measured on Recurring Basis | U.S. Agency | Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale fixed income	58,455	59,826
Fair Value Measured on Recurring Basis | Non-U.S. government & agency
Assets measured at Fair Value
Available-for-sale fixed income	3,844	3,882
Fair Value Measured on Recurring Basis | Non-U.S. government & agency | Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale fixed income	3,844	3,882
Fair Value Measured on Recurring Basis | Agency MBS
Assets measured at Fair Value
Available-for-sale fixed income	414,428	425,285
Fair Value Measured on Recurring Basis | Agency MBS | Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale fixed income	414,428	425,285
Fair Value Measured on Recurring Basis | ABS/CMBS/MBS
Assets measured at Fair Value
Available-for-sale fixed income	289,476	281,182
Fair Value Measured on Recurring Basis | ABS/CMBS/MBS | Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale fixed income	289,476	281,182
Fair Value Measured on Recurring Basis | Corporate Debt
Assets measured at Fair Value
Available-for-sale fixed income	1,221,047	1,225,019
Fair Value Measured on Recurring Basis | Corporate Debt | Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale fixed income	1,158,487	1,164,548
Fair Value Measured on Recurring Basis | Corporate Debt | Significant Unobservable Inputs (Level 3)
Assets measured at Fair Value
Available-for-sale fixed income	62,560	60,471
Fair Value Measured on Recurring Basis | Municipal
Assets measured at Fair Value
Available-for-sale fixed income	546,512	552,624
Fair Value Measured on Recurring Basis | Municipal | Significant Other Observable Inputs (Level 2)
Assets measured at Fair Value
Available-for-sale fixed income	$ 546,512	$ 552,624

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Investments - Changes in Balance of Level 3 Securities (Details) - Significant Unobservable Inputs (Level 3) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Summary of changes in Level 3 securities
Beginning balance	$ 62,096
Included in other comprehensive earnings (loss)	(271)
Purchases	2,735
Sales / Calls / Maturities	(391)
Ending balance	64,169
Change in unrealized gains (losses) during the period for Level 3 assets held at period-end - OCI	$ (271)

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Investments - Amortized Cost and Fair Value of Available-for-sale Fixed Income Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 188,801
Due after one year through five years	875,943
Due after five years through 10 years	696,813
Due after 10 years	548,944
ABS/CMBS/MBS	771,772
Total available-for-sale	3,082,273	$ 3,054,391
Fair Value
Due in one year or less	186,550
Due after one year through five years	843,536
Due after five years through 10 years	669,310
Due after 10 years	460,021
ABS/CMBS/MBS	703,904
Total available-for-sale	$ 2,863,321	$ 2,855,849

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Investments - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) security	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Investments
Accrued investment income | $	$ 25,353		$ 24,062
Number of debt securities for which there is an allowance for credit losses | security	11
Losses on fixed income securities | $	$ 0	$ 2,000
Number of debt securities in an unrealized loss position for which an allowance for credit losses has not been recorded | security	1,336
Unrealized loss | $	$ 227,870		214,396
Unrealized losses as percentage of fixed income portfolio cost basis	7.00%
Unrealized losses relative to total invested assets (as a percent)	6.00%
Number of unrealized loss positions | security	1,336
Number of securities in unrealized loss positions for 12 months or longer | security	1,135
Fixed Income Securities
Investments
Accrued investment income | $	$ 24,000		$ 23,000

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Investments - Amortized Cost and Fair Value of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Available For Sale Securities
Cost or Amortized Cost	$ 3,082,273	$ 3,054,391
Allowance for Credit Losses	(237)	(306)	$ (465)	$ (339)
Gross Unrealized Gains	9,155	16,160
Gross Unrealized Losses	(227,870)	(214,396)
Fair Value	2,863,321	2,855,849
U.S. government
Available For Sale Securities
Cost or Amortized Cost	337,014	312,632
Gross Unrealized Gains	388	1,257
Gross Unrealized Losses	(7,843)	(5,858)
Fair Value	329,559	308,031
U.S. Agency
Available For Sale Securities
Cost or Amortized Cost	59,956	60,763
Gross Unrealized Gains	444	652
Gross Unrealized Losses	(1,945)	(1,589)
Fair Value	58,455	59,826
Non-U.S. government & agency
Available For Sale Securities
Cost or Amortized Cost	4,800	4,800
Gross Unrealized Losses	(956)	(918)
Fair Value	3,844	3,882
Agency MBS
Available For Sale Securities
Cost or Amortized Cost	456,358	460,551
Gross Unrealized Gains	1,208	2,636
Gross Unrealized Losses	(43,138)	(37,902)
Fair Value	414,428	425,285
ABS/CMBS/MBS
Available For Sale Securities
Cost or Amortized Cost	315,414	308,458
Allowance for Credit Losses	(2)	(3)
Gross Unrealized Gains	970	611
Gross Unrealized Losses	(26,906)	(27,884)
Fair Value	289,476	281,182
Corporate Debt
Available For Sale Securities
Cost or Amortized Cost	1,277,258	1,273,187
Allowance for Credit Losses	(235)	(303)
Gross Unrealized Gains	4,732	8,766
Gross Unrealized Losses	(60,708)	(56,631)
Fair Value	1,221,047	1,225,019
Municipal
Available For Sale Securities
Cost or Amortized Cost	631,473	634,000
Gross Unrealized Gains	1,413	2,238
Gross Unrealized Losses	(86,374)	(83,614)
Fair Value	$ 546,512	$ 552,624

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Investments - Debt Securities Available-for-sale Allowance for Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments Debt And Equity Securities [Abstract]
Beginning balance	$ 306	$ 339
Increase to allowance from securities for which credit losses were not previously recorded	12	54
Reduction from securities sold during the period	(67)
Net increase (decrease) from securities that had an allowance at the beginning of the period	(14)	72
Ending balance	$ 237	$ 465

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Investments - Securities in an Unrealized Loss Position Segregated by Type and Length of Time in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair value
Less than 12 months	$ 434,654	$ 248,510
12 months and greater	1,922,397	1,939,305
Total Fair Value	2,357,051	2,187,815
Amortized Cost
Amortized cost, less than 12 months	441,318	250,863
12 months and greater	2,143,603	2,151,348
Total Cost or Amortized Cost	2,584,921	2,402,211
Unrealized Loss
Less than 12 months	(6,664)	(2,353)
12 months and greater	(221,206)	(212,043)
Total Unrealized Loss	(227,870)	(214,396)
U.S. government
Fair value
Less than 12 months	78,413	37,718
12 months and greater	203,962	204,556
Total Fair Value	282,375	242,274
Amortized Cost
Amortized cost, less than 12 months	79,565	37,950
12 months and greater	210,653	210,182
Total Cost or Amortized Cost	290,218	248,132
Unrealized Loss
Less than 12 months	(1,152)	(232)
12 months and greater	(6,691)	(5,626)
Total Unrealized Loss	(7,843)	(5,858)
U.S. Agency
Fair value
Less than 12 months	15,822	8,736
12 months and greater	28,854	29,632
Total Fair Value	44,676	38,368
Amortized Cost
Amortized cost, less than 12 months	15,995	8,790
12 months and greater	30,626	31,167
Total Cost or Amortized Cost	46,621	39,957
Unrealized Loss
Less than 12 months	(173)	(54)
12 months and greater	(1,772)	(1,535)
Total Unrealized Loss	(1,945)	(1,589)
Non-U.S. government & agency
Fair value
12 months and greater	3,844	3,882
Total Fair Value	3,844	3,882
Amortized Cost
12 months and greater	4,800	4,800
Total Cost or Amortized Cost	4,800	4,800
Unrealized Loss
12 months and greater	(956)	(918)
Total Unrealized Loss	(956)	(918)
Agency MBS
Fair value
Less than 12 months	55,007	61,196
12 months and greater	288,704	275,707
Total Fair Value	343,711	336,903
Amortized Cost
Amortized cost, less than 12 months	56,100	61,714
12 months and greater	330,749	313,091
Total Cost or Amortized Cost	386,849	374,805
Unrealized Loss
Less than 12 months	(1,093)	(518)
12 months and greater	(42,045)	(37,384)
Total Unrealized Loss	(43,138)	(37,902)
ABS/CMBS/MBS
Fair value
Less than 12 months	25,663	12,240
12 months and greater	182,583	211,436
Total Fair Value	208,246	223,676
Amortized Cost
Amortized cost, less than 12 months	25,831	12,367
12 months and greater	209,321	239,193
Total Cost or Amortized Cost	235,152	251,560
Unrealized Loss
Less than 12 months	(168)	(127)
12 months and greater	(26,738)	(27,757)
Total Unrealized Loss	(26,906)	(27,884)
Corporate Debt
Fair value
Less than 12 months	185,542	67,402
12 months and greater	795,631	822,731
Total Fair Value	981,173	890,133
Amortized Cost
Amortized cost, less than 12 months	188,580	68,345
12 months and greater	853,301	878,419
Total Cost or Amortized Cost	1,041,881	946,764
Unrealized Loss
Less than 12 months	(3,038)	(943)
12 months and greater	(57,670)	(55,688)
Total Unrealized Loss	(60,708)	(56,631)
Municipal
Fair value
Less than 12 months	74,207	61,218
12 months and greater	418,819	391,361
Total Fair Value	493,026	452,579
Amortized Cost
Amortized cost, less than 12 months	75,247	61,697
12 months and greater	504,153	474,496
Total Cost or Amortized Cost	579,400	536,193
Unrealized Loss
Less than 12 months	(1,040)	(479)
12 months and greater	(85,334)	(83,135)
Total Unrealized Loss	$ (86,374)	$ (83,614)

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Investments - Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Cost or amortized Cost
Total Cost or Amortized Cost	$ 2,584,921	$ 2,402,211
Fair value
Total Fair Value	2,357,051	2,187,815
Unrealized Loss
Total Unrealized Loss	$ (227,870)	$ (214,396)
Percent to Total	100.00%
NAIC Rating 1 | AAA/AA/A | Aaa/Aa/A
Cost or amortized Cost
Total Cost or Amortized Cost	$ 2,137,898
Fair value
Total Fair Value	1,941,077
Unrealized Loss
Total Unrealized Loss	$ (196,821)
Percent to Total	86.40%
NAIC Rating 2 | BBB | Baa
Cost or amortized Cost
Total Cost or Amortized Cost	$ 397,220
Fair value
Total Fair Value	369,097
Unrealized Loss
Total Unrealized Loss	$ (28,123)
Percent to Total	12.30%
NAIC Rating 3 | BB | Ba
Cost or amortized Cost
Total Cost or Amortized Cost	$ 31,428
Fair value
Total Fair Value	29,952
Unrealized Loss
Total Unrealized Loss	$ (1,476)
Percent to Total	0.70%
NAIC Rating 4 | B | B
Cost or amortized Cost
Total Cost or Amortized Cost	$ 14,826
Fair value
Total Fair Value	14,073
Unrealized Loss
Total Unrealized Loss	$ (753)
Percent to Total	0.30%
NAIC Rating 5 | CCC | Caa
Cost or amortized Cost
Total Cost or Amortized Cost	$ 2,730
Fair value
Total Fair Value	2,421
Unrealized Loss
Total Unrealized Loss	$ (309)
Percent to Total	0.10%
NAIC Rating 6 | CC Or Lower | Ca or lower
Cost or amortized Cost
Total Cost or Amortized Cost	$ 819
Fair value
Total Fair Value	431
Unrealized Loss
Total Unrealized Loss	$ (388)
Percent to Total	0.20%

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Investments - Debt and Short-term Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Investments
Other investments	$ 59,273		$ 59,081
Investment in unconsolidated investees	66,134		56,966
Cash and Short-term Investments
Cash	44,557		36,424
Short-term investments	147,186		134,923
Other Unconsolidated Investees | Maximum
Investments
Investment in unconsolidated investees	1,000
Prime Holdings Insurance Services, Inc. (Prime)
Investments
Investment in unconsolidated investees	66,000
FHLBC
Investments
Investments pledged as collateral	$ 57,000
Investment in federal home loan bank stock	us-gaap:AssetPledgedAsCollateralMember
Federal home loan bank borrowings fair value disclosure	$ 50,000
Investment In Low Income Housing Tax Credit Partnerships (LIHTC)
Investments
Other investments	9,000		10,000
Amortization on low income housing investments	1,000	$ 1,000
Total tax benefit on investments in tax credit partnership	1,000	1,000
Investment In Low Income Housing Tax Credit Partnerships (LIHTC) | Maximum
Investments
Qualified affordable housing project investments, unfunded commitment	1,000
Historic tax credit partnerships (HTC)
Investments
Other investments	12,000		13,000
Amortization on qualifying equity investments	1,000	1,000
Total tax benefit on investments in tax credit partnership	1,000	$ 1,000
Investment in Private Funds
Investments
Other investments	27,000		$ 28,000
Fair value investments entities that calculate net asset value per share, unfunded commitments	$ 4,000

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Historical Loss and LAE Development - Reconciliation of Unpaid Losses and Settlement Expenses (LAE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Unpaid losses and LAE at beginning of year
Gross	$ 2,446,025	$ 2,315,637
Ceded	(757,349)	(740,089)
Net	1,688,676	1,575,548
Increase (decrease) in incurred losses and LAE
Current accident year	186,217	166,270
Prior accident years	(42,393)	(51,782)
Total incurred	143,824	114,488
Loss and LAE payments for claims incurred
Current accident year	(12,975)	(7,983)
Prior accident years	(102,011)	(95,905)
Total paid	(114,986)	(103,888)
Net unpaid losses and LAE at March 31	1,717,514	1,586,148
Unpaid losses and LAE at March 31
Gross	2,532,190	2,286,063
Ceded	(814,676)	(699,915)
Net unpaid losses and LAE at March 31	$ 1,717,514	$ 1,586,148

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Income Taxes - Additional Information (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure
Effective income tax rate reconciliation, percent, total	20.10%	19.50%
U.S. federal tax rate	21.00%	21.00%

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Income Taxes - Reconciliation of Income Tax Expense (Benefit) Attributable to Income from Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reconciliation of income tax expense reported to amount computed by applying the U.S. federal tax rate
Provision for income taxes at the statutory federal rate	$ 33,598	$ 25,786
Increase (reduction) in taxes resulting from:
Excess tax benefit on share-based compensation	(1,874)	(1,990)
Tax exempt interest income	(260)	(283)
Dividends received deduction	(235)	(224)
Tax credit	(768)	(513)
ESOP dividends paid deduction	(138)	(137)
Nondeductible expenses	713	601
Other items, net	1,055	740
Income tax expense	$ 32,091	$ 23,980
Reconciliation of income tax expense rate to the U.S. federal tax rate
Tax rate used (as a percent)	21.00%	21.00%
Excess tax benefit on share-based compensation (as a percent)	(1.20%)	(1.60%)
Effective rate reduction due to tax exempt interest income (as a percent)	(0.20%)	(0.20%)
Effective rate reduction due to dividend received (as a percent)	(0.10%)	(0.20%)
Effective rate reduction due to tax credit (as a percent)	(0.50%)	(0.40%)
Effective rate reduction due to dividend paid to ESOP (as a percent)	(0.10%)	(0.10%)
Effective rate reduction due to nondeductible expenses (as a percent)	0.40%	0.50%
Effective rate reduction due to other items, net (as a percent)	0.80%	0.50%
Total tax expense	20.10%	19.50%

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Stock Based Compensation - Stock Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		11 Months Ended	96 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	May 03, 2023	May 04, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted (in shares)	27,875
Intrinsic value of options	$ 8.0	$ 11.0
RLI Corp. Long-Term Incentive Plans
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expenses	1.8	2.5
Income tax benefit from stock-based compensation	0.3	$ 0.4
Unrecognized stock-based compensation expense	$ 5.0		$ 5.0
Stock-based compensation expenses, recognition period	2 years 7 months 17 days
RLI Corp. Long-Term Incentive Plans | Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period	5 years
Term of options	8 years
RLI Corp. Long-Term Incentive Plans | Employee Stock Option | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Age and period of service of the participant to be eligible for retirement	75 years
RLI Corp. Long-Term Incentive Plan (2015 LTIP)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized for grant				4,000,000
Options granted (in shares)				3,291,388
RLI Corp. Long-Term Incentive Plan (2023 LTIP)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized for grant					4,004,891
Options granted (in shares)	28,475		224,013

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Stock Based Compensation - Summary of Option Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2023 USD ($)
Weighted Number of Options Outstanding
Outstanding options, Beginning Balance | shares	1,641,710
Options granted (in shares) | shares	27,875
Options exercised | shares	(93,470)
Options canceled/forfeited | shares	(1,365)
Outstanding options, Ending Balance | shares	1,574,750
Exercisable options, Ending Balance | shares	819,591
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding options, Beginning Balance | $ / shares	$ 92.62
Weighted Average Exercise Price, Options granted | $ / shares	135.94
Weighted Average Exercise Price, Options exercised | $ / shares	64.52
Weighted Average Exercise Price, Options canceled/forfeited | $ / shares	109.50
Weighted Average Exercise Price, Outstanding options, Ending Balance | $ / shares	95.04
Weighted Average Exercise Price, Exercisable options | $ / shares	$ 80.95
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life, Outstanding options	4 years 6 months 29 days
Weighted Average Remaining Contractual Life, Exercisable options	3 years 5 months 8 days
Aggregate Intrinsic Value, Options exercised | $	$ 8,000	$ 11,000
Aggregate Intrinsic Value, Outstanding options | $	84,145
Aggregate Intrinsic Value, Exercisable options | $	$ 55,335

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Stock Based Compensation - Summary of Weighted Average Grant-date Assumptions and Weighted Average Fair Values (Details) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Weighted average grant date assumptions and weighted average fair value
Weighted-average fair value of grants	$ 30.60	$ 27.04
Risk-free interest rates	4.62%	4.22%
Dividend yield	2.24%	2.54%
Expected volatility	23.05%	22.93%
Expected option life	5 years 29 days	5 years 3 days

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Stock Based Compensation - Restricted Stock Units - Additional Information (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2024
Minimum
Share Based Compensation
Age and period of service of the participant to be eligible for retirement	75 years
Employees
Share Based Compensation
Award vesting period	3 years
Directors
Share Based Compensation
Award vesting period	1 year

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Stock Based Compensation - Schedule of Restricted Stock Units Activity (Details)	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Number of RSUs
RSUs Nonvested, Beginning Balance | shares	45,093
RSUs Granted | shares	600
RSUs Reinvested | shares	85
RSUs Forfeited | shares	(128)
RSUs Nonvested, Ending Balance | shares	45,650
Weighted Average Grant Date Fair Value
Weighted Average Grant Date Fair Value, Nonvested, Beginning Balance | $ / shares	$ 125.16
Weighted Average Grant Date Fair Value, Granted | $ / shares	142.08
Weighted Average Grant Date Fair Value, Reinvested | $ / shares	145.36
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	124.07
Weighted Average Grant Date Fair Value, Nonvested, Ending Balance | $ / shares	$ 125.43

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Operating Segment Information - Summary by Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues
Net premiums earned	$ 360,676	$ 307,723
Net investment income	32,847	27,084
Net realized gains	5,994	14,620
Net unrealized gains on equity securities	45,314	15,496
Consolidated revenue	444,831	364,923
Net Earnings
Net underwriting income	77,695	67,890
Net investment income	32,847	27,084
Net realized gains	5,994	14,620
Net unrealized gains on equity securities	45,314	15,496
General corporate expense and interest on debt	(6,628)	(6,222)
Equity in earnings of unconsolidated investees	4,769	3,923
Earnings before income taxes	159,991	122,791
Income tax expense	32,091	23,980
Net earnings	127,900	98,811
Casualty Segment
Revenues
Net premiums earned	198,276	186,031
Net Earnings
Net underwriting income	13,674	31,831
Property Segment
Revenues
Net premiums earned	129,411	88,767
Net Earnings
Net underwriting income	57,716	28,383
Surety Segment
Revenues
Net premiums earned	32,989	32,925
Net Earnings
Net underwriting income	$ 6,305	$ 7,676

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Operating Segment Information - Summary of Revenue by Major Product Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting
Net premiums earned	$ 360,676	$ 307,723
Casualty Segment
Segment Reporting
Net premiums earned	198,276	186,031
Casualty Segment | Commercial excess and personal umbrella
Segment Reporting
Net premiums earned	80,035	67,582
Casualty Segment | Commercial transportation
Segment Reporting
Net premiums earned	27,301	25,232
Casualty Segment | General liability
Segment Reporting
Net premiums earned	25,412	25,900
Casualty Segment | Professional services
Segment Reporting
Net premiums earned	25,085	24,357
Casualty Segment | Small commercial
Segment Reporting
Net premiums earned	18,337	17,941
Casualty Segment | Executive products
Segment Reporting
Net premiums earned	5,915	6,353
Casualty Segment | Other casualty
Segment Reporting
Net premiums earned	16,191	18,666
Property Segment
Segment Reporting
Net premiums earned	129,411	88,767
Property Segment | Commercial property
Segment Reporting
Net premiums earned	87,605	49,262
Property Segment | Marine
Segment Reporting
Net premiums earned	32,568	30,636
Property Segment | Other property
Segment Reporting
Net premiums earned	9,238	8,869
Surety Segment
Segment Reporting
Net premiums earned	32,989	32,925
Surety Segment | Transactional
Segment Reporting
Net premiums earned	12,108	12,047
Surety Segment | Commercial
Segment Reporting
Net premiums earned	10,625	12,418
Surety Segment | Contract
Segment Reporting
Net premiums earned	$ 10,256	$ 8,460

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Leases - Schedule of Components of Lease Expense and Other lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Leases [Abstract]
Operating lease cost	$ 1,181	$ 1,269
Variable lease cost	269	438
Sublease income	(42)	(139)
Total lease cost	1,408	1,568
Cash paid for amounts included in measurement of lease liabilities
Operating cash outflows from operating leases	1,063	1,398
ROU assets obtained in exchange for new operating lease liabilities	3,456	41
Reduction to ROU assets resulting from reduction to lease liabilities		$ 200
Operating lease ROU assets	$ 16,083		$ 13,666
Operating Lease, Right-of-Use Asset, Statement of Financial Position	Other assets		Other assets
Operating lease liabilities	$ 17,415		$ 14,880
Operating Lease, Liability, Statement of Financial Position	Other liabilities		Other liabilities
Weighted-average remaining lease term - operating leases	6 years 1 month 28 days		6 years 29 days
Weighted-average discount rate - operating leases	3.48%		3.21%

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Leases - Schedule of Future Minimum Lease Payments under Non-cancellable Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Future minimum lease payments under non-cancellable leases
2024	$ 3,248
2025	4,048
2026	3,256
2027	2,135
2028	1,544
2029	1,450
Thereafter	4,199
Total future minimum lease payments	19,880
Less imputed interest	(2,465)
Operating lease liabilities	$ 17,415	$ 14,880

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Acquisitions and Dispositions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Dispositions
Cash proceeds from sale	$ 14,134
Maui Jim Inc. | Net Realized Gains
Dispositions
Recognized gain on sale	$ 14,000

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Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 127,900	$ 98,811

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Insider Trading Arrangements	3 Months Ended
	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false