Exhibit 99.5

TALOS ENERGY INC.

UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS

The following unaudited pro forma combined financial statements present the combination of the historical financial information of Talos Energy Inc., a Delaware corporation (the “Company” or “Talos”), ILX Holdings, LLC, a Delaware limited liability company (“ILX Holdings”), ILX Holdings II, LLC, a Delaware limited liability company (“ILX Holdings II”), Castex Energy 2014, LLC, a Delaware limited liability company (“Castex 2014”) and Castex Energy 2016, LP, a Delaware limited partnership (“Castex 2016” and, together with Castex 2014, the “Castex Sellers”), adjusted to give effect to the Transactions (as defined below) and related financing consisting of borrowings under the Company’s revolving bank credit facility. In addition, while the Company acquired substantially all of the key operating assets of ILX Holdings, ILX Holdings II and the Castex Sellers, the historical financial information was adjusted to eliminate specified assets and liabilities, and the associated income affect, not in certain of the wholly-owned subsidiaries of ILX Holdings and ILX Holdings II (collectively, the “ILX Target Entities”) and certain wholly-owned subsidiaries of the Castex Sellers (the “Castex Target Entities”), or were considered Excluded Assets in the Purchase Agreements (as defined below).

The unaudited pro forma combined statement of operations for the year ended December 31, 2019 combines the historical consolidated statements of operations of Talos, ILX Holdings, ILX Holdings II and the Castex Sellers giving effect to the Transactions and related financing as if they had been consummated on January 1, 2019. The unaudited pro forma combined balance sheet combines the historical consolidated balance sheets of Talos, ILX Holdings, ILX Holdings II and the Castex Sellers as of December 31, 2019, giving effect to the Transactions and related financing as if closing had occurred on December 31, 2019.

The following unaudited pro forma combined financial statements are based on, and should be read in conjunction with:

• The historical audited consolidated financial statements of the Company and the related notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on March 12, 2020;

• The historical audited consolidated financial statements of ILX Holdings and the related notes included as Exhibit 99.1 in the Company’s Current Report on Form 8-K filed with the SEC on September 11, 2020;

• The historical audited consolidated financial statements of ILX Holdings II and the related notes included as Exhibit 99.2 in the Company’s Current Report on Form 8-K filed with the SEC on September 11, 2020;

• The historical audited consolidated financial statements of Castex 2014 and the related notes included as Exhibit 99.3 in the Company’s Current Report on Form 8-K filed with the SEC on September 11, 2020; and

• The historical audited consolidated financial statements of Castex 2016 and the related notes included as Exhibit 99.4 in the Company’s Current Report on Form 8-K filed with the SEC on September 11, 2020.

On February 28, 2020 (the “Closing Date”), the Company acquired the outstanding limited liability interests in certain wholly owned subsidiaries of ILX Holdings, ILX Holdings II, ILX Holdings III, LLC, a Delaware limited liability company (“ILX Holdings III”) and Castex 2014, each a related party and an affiliate of certain entities controlled or affiliated with Riverstone Energy Partners V, L.P. (collectively, the “Riverstone Sellers”), and Castex 2016 (together with the Riverstone Sellers, the “Sellers”) with an effective date of July 1, 2019 (collectively, the “ILX and Castex Acquisition”). The ILX and Castex Acquisition was consummated pursuant to separate Purchase and Sale Agreements, dated December 10, 2019 (as amended from time to time, the “Purchase Agreements”) for aggregate consideration consisting of (i) $385.0 million in cash subject to customary closing adjustments and (ii) an aggregate 110,000 shares (the “Preferred Shares”) of a series of the Company’s preferred stock, par value $0.01 per

1

share, designated as “Series A Convertible Preferred Stock” were issued to the Riverstone Sellers (such issuance, the “Preferred Stock Issuance”) on the terms and subject to the conditions set forth in that certain Certificate of Designation of Preferences, Rights and Limitations relating to the Series A Convertible Preferred Stock (the “Certificate of Designation”) which subsequently converted to 11.0 million shares of the Company’s common stock, par value $0.01 per share (the “Common Stock”) on March 30, 2020 (the “Conversion” and such Common Stock, the “Conversion Stock”). The Preferred Stock Issuance, the ILX and Castex Acquisition, the Conversion and the other transactions contemplated by the Purchase Agreements are referred to herein collectively as the “Transactions”. The cash payment and escrow deposit were funded with borrowings under the revolving bank credit facility.

The accompanying unaudited pro forma combined financial statements were derived by making certain adjustments to the historical financial statements listed above that are (i) directly attributable to the Transactions and related financing, (ii) factually supportable and (iii) with respect to the unaudited pro forma combined statement of operations, expected to have a continuing impact on the combined results. The adjustments are based on currently available information and certain estimates and assumptions. Therefore, the actual adjustments may differ from the pro forma adjustments. However, management believes that the assumptions provide a reasonable basis for presenting the significant effects of the Transactions and related financing and that the pro forma adjustments give appropriate effect to those assumptions and are properly applied in the unaudited pro forma combined financial statements.

The unaudited pro forma combined financial statements and related notes are presented for illustrative purposes only and should not be relied upon as an indication of operating results that Talos would have achieved if the Transactions and related financing had taken place on the specified date. In addition, future results may vary significantly from the results reflected in the unaudited pro forma combined financial statements and should not be relied on as an indication of the future results of Talos.

2

TALOS ENERGY INC.

UNAUDITED PRO FORMA COMBINED BALANCE SHEETS

AS OF DECEMBER 31, 2019

(In thousands, except per share data)

	Talos Historical			Target Assets Historical			Pro Forma Adjustments					Pro Forma Combined
				Note 2			Note 4
ASSETS
Current assets:
Cash and cash equivalents	$	87,022		$	4,841		$	—				$	91,863
Accounts receivable, net
Trade		107,842			7,087			—					114,929
Joint Interest		16,552			—			—					16,552
Other		6,346			—			—					6,346
Assets from price risk management activities		8,393			—			—					8,393
Prepaid assets		65,877			660			—					66,537
Income tax receivable		116			—			—					116
Other current assets		1,836			146			—					1,982
Total current assets		293,984			12,734			—					306,718
Property and equipment:
Proved properties		4,066,260			1,029,376			(627,246	)	(a	)		4,468,390
Unproved properties, not subject to amortization		194,532			86,049			1,522		(a	)		282,103
Other property and equipment		29,843			—			—					29,843
Total property and equipment		4,290,635			1,115,425			(625,724	)				4,780,336
Accumulated depreciation, depletion and amortization		(2,065,023	)		(623,530	)		623,530		(a	)		(2,065,023	)
Total property and equipment, net		2,225,612			491,895			(2,194	)				2,715,313
Other long-term assets:
Other well equipment inventory		7,732			—			—					7,732
Operating lease assets		7,779			—			—					7,779
Other assets		54,375			2,226			(1,974	)	(b	)		54,627
Total assets	$	2,589,482		$	506,855		$	(4,168	)			$	3,092,169
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	71,357		$	8,131		$	10,094		(c	)	$	89,582
Accrued liabilities		154,816			224			—					155,040
Accrued royalties		31,729			—			—					31,729
Current portion of asset retirement obligations		61,051			3,916			(3,916	)	(d	)		61,051
Liabilities from price risk management activities		19,476			—			—					19,476
Accrued interest payable		10,249			—			—					10,249
Current portion of operating lease liabilities		1,594			—			—					1,594
Other current liabilities		20,180			—			—					20,180
Total current liabilities		370,452			12,271			6,178					388,901
Long-term liabilities:
Long-term debt, net of discount and deferred financing costs		732,981			—			296,966		(e	)		1,029,947
Asset retirement obligations		308,427			63,818			(22,652	)	(d	)		349,593
Liabilities from price risk management activities		511			—			—					511
Operating lease liabilities		17,239			—			—					17,239
Other long-term liabilities		81,595			—			—		(f	)		81,595
Total liabilities		1,511,205			76,089			280,492					1,867,786
Members’ equity		—			430,766			(430,766	)	(g	)		—
Stockholders’ equity:
Preferred stock, $0.01 par value; 30,000,000 shares authorized and no shares issued or outstanding as of December 31, 2019		—			—			—					—
Common stock, $0.01 par value; 270,000,000 shares authorized; 54,197,004 shares issued and outstanding as of December 31, 2019		542			—			110		(h	)		652
Additional paid-in capital		1,346,142			—			156,090		(h	)		1,502,232
Accumulated deficit		(268,407	)		—			(10,094	)	(c	)		(278,501	)
Total stockholders’ equity		1,078,277			430,766			(284,660	)				1,224,383
Total liabilities and stockholders’ equity	$	2,589,482		$	506,855		$	(4,168	)			$	3,092,169

3

TALOS ENERGY INC.

UNAUDITED PRO FORMA COMBINED STATEMENT OF OPERATIONS

FOR THE YEAR ENDED DECEMBER 31, 2019

(In thousands, except per share data)

	Talos Historical			Target Assets Historical			Pro Forma Adjustments					Pro Forma Combined
				Note 2			Note 4
Revenues:
Oil revenue	$	833,118		$	276,829		$	—				$	1,109,947
Natural gas revenue		55,278			30,774			—					86,052
NGL revenue		19,668			11,168			—					30,836
Other		19,556			—			—					19,556
Total revenue		927,620			318,771			—					1,246,391
Operating expenses:
Lease operating expense		243,427			101,590			(156	)	(i	)		344,861
Production taxes		1,349			1,535			—					2,884
Depreciation, depletion and amortization		345,931			133,707			(72,946	)	(j	)		406,692
Write-down of oil and natural gas properties		12,221			70,530			(70,530	)	(k	)		12,221
Accretion expense		34,389			4,745			—					39,134
General and administrative expense		77,209			19,620			(4,375	)	(l	)		92,454
Total operating expenses		714,526			331,727			(148,007	)				898,246
Operating income (loss)		213,094			(12,956	)		148,007					348,145
Interest expense		(97,847	)		—			(14,441	)	(m	)		(112,288	)
Price risk management activities income (expense)		(95,337	)		—			—					(95,337	)
Other income		2,678			599			—					3,277
Net income (loss) before income taxes		22,588			(12,357	)		133,566					143,797
Income tax benefit (expense)		36,141			—			(32,139	)	(n	)		4,002
Net income (loss)	$	58,729		$	(12,357	)	$	101,427				$	147,799
Net income per common share:
Basic	$	1.08										$	2.27
Diluted	$	1.08										$	2.26
Weighted average common shares outstanding:
Basic		54,185											65,185	(o)
Diluted		54,413											65,413	(o)

4

TALOS ENERGY INC.

NOTES TO THE UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS

Note 1. Basis of Presentation

The unaudited pro forma combined financial statements present the combination of the historical financial information of Talos, ILX Holdings, ILX Holdings II and the Castex Sellers, adjusted to give effect to the Transactions and additional borrowings under the revolving bank credit facility. In addition, while the Company acquired substantially all of the key operating assets of ILX Holdings, ILX Holdings II and the Castex Sellers, the historical financial information was adjusted to eliminate specified assets and liabilities not acquired by Talos as part of the Transactions. See Note 2 — Consolidation of Acquired Entities, for additional information.

The unaudited pro forma combined statement of operations for the fiscal year ended December 31, 2019 combines the historical consolidated statements of operations of Talos, ILX Holdings, ILX Holdings II and the Castex Sellers, giving effect to the Transactions and related financing as if they had been consummated on January 1, 2019. The unaudited pro forma combined balance sheet combines the historical consolidated balance sheets of Talos, ILX Holdings, ILX Holdings II and the Castex Sellers as of December 31, 2019, giving effect to the Transactions and related financing as if the closing had occurred on December 31, 2019. The Transactions and other adjustments are described in Note 4 — Pro Forma Adjustments to these unaudited pro forma combined financial statements.

Certain reclassifications have been made to the historical financial statements of ILX Holdings, ILX Holdings II and the Castex Sellers to reflect the comparability of financial information. However, the pro forma combined financial statements may not reflect all adjustments necessary to conform the accounting policies of ILX Holdings, ILX Holdings II and the Castex Sellers to those of Talos due to the limitations on the availability of information.

The pro forma adjustments represent management’s estimates based on information available as of the date hereof and are subject to change as additional information becomes available and additional analyses are performed. The pro forma financial statements do not reflect the impact of possible revenue or earnings enhancements, cost savings from operating efficiencies or synergies, or asset dispositions. Also, the pro forma financial statements do not reflect possible adjustments related to restructuring or integration activities or transaction or other costs following the Transactions that are not expected to have a continuing impact. Further, one-time transaction-related expenses anticipated to be incurred prior to, or concurrent with, closing of the Transactions are not included in the pro forma statements of operations. However, the impact of such transaction expenses is reflected in the pro forma balance sheet as an increase to accounts payable and accumulated deficit.

The unaudited pro forma combined financial information has been prepared using the acquisition method of accounting with Talos as the accounting acquirer of the assets acquired from the ILX Target Entities and the Castex Target Entities (the “Target Assets”). Under the acquisition method of accounting, the purchase price is allocated to the identifiable tangible and intangible assets acquired and liabilities assumed based on their respective fair values, with any excess in purchase price allocated to goodwill. The fair value of identifiable assets acquired and liabilities assumed from the Transactions are based on a preliminary estimate of fair value using assumptions described in the accompanying notes to the unaudited pro forma combined financial information that the Company believes is reasonable. See Note 3 — Preliminary Purchase Price Allocation, for additional information.

5

Note 2. Consolidation of Acquired Entities

The following table illustrates the historical balances sheets of ILX Holdings, ILX Holdings II and the Castex Sellers, including the elimination of specific assets and liabilities not acquired by Talos, that form the Target Assets Historical column on the unaudited combined balance sheets as of December 31, 2019. Certain reclassifications have been made to the historical financial statements of ILX Holdings, ILX Holdings II and the Castex Sellers to reflect the comparability of financial information.

	ILX Holdings Historical			ILX Holdings II Historical			Castex 2014 Historical			Castex 2016 Historical			Excluded Assets					Total Target Assets Historical
ASSETS
Current assets:
Cash and cash equivalents	$	25,589		$	57,897		$	4,369		$	472		$	(83,486	)	(a	)	$	4,841
Accounts receivable, net
Trade		10,671			11,338			6,344			743			(22,009	)	(b	)		7,087
Other		1,332			741			—			—			(2,073	)	(b	),(d)		—
Prepaid assets		430			888			589			71			(1,318	)	(b	)		660
Other current assets		—			891			133			13			(891	)	(b	)		146
Total current assets		38,022			71,755			11,435			1,299			(109,777	)				12,734
Property and equipment:
Proved properties		269,396			605,915			262,125			16,209			(124,269	)	(e	)		1,029,376
Unproved properties, not subject to amortization		—			89,909			32,076			393			(36,329	)	(e	)		86,049
Total property and equipment		269,396			695,824			294,201			16,602			(160,598	)				1,115,425
Accumulated depreciation, depletion and amortization		(167,125	)		(303,177	)		(149,361	)		(3,867	)		—					(623,530	)
Total property and equipment, net		102,271			392,647			144,840			12,735			(160,598	)				491,895
Other long-term assets:
Other assets		2,255			3,303			228			24			(3,584	)	(b	)		2,226
Total assets	$	142,548		$	467,705		$	156,503		$	14,058		$	(273,959	)			$	506,855
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable	$	7,398		$	7,387		$	6,208		$	1,923		$	(14,785	)	(b	)	$	8,131
Accrued liabilities		3,869			3,383			192			32			(7,252	)	(b	)		224
Current portion of asset retirement obligations		—			—			3,623			293			—					3,916
Liabilities from price risk management activities		2,580			534			252			—			(3,366	)	(c	)		—
Other current liabilities		271			100			—			—			(371	)	(b	)		—
Total current liabilities		14,118			11,404			10,275			2,248			(25,774	)				12,271
Long-term liabilities
Long-term debt		—			—			20,690			979			(21,669	)	(f	)		—
Asset retirement obligations		5,854			17,345			37,445			4,648			(1,474	)	(e	)		63,818
Liabilities from price risk management activities		—			496			—			—			(496	)	(c	)		—
Total liabilities		19,972			29,245			68,410			7,875			(49,413	)				76,089
Total members’ equity		122,576			438,460			88,093			6,183			(224,546	)	(g	)		430,766
Total liabilities and members’ equity	$	142,548		$	467,705		$	156,503		$	14,058		$	(273,959	)			$	506,855

(a) Reflects the exclusion of cash and cash equivalents from ILX Holdings and ILX Holdings II as such assets are considered Excluded Assets under the Purchase Agreements and are not included in the Transactions.

6

(b) Reflects the exclusion of working capital and other long term assets of ILX Holdings and ILX Holdings II, as such assets and liabilities are considered Excluded Assets under the applicable Purchase Agreements and are not included in the Transactions.

(c) Reflects the exclusion of assets and liabilities associated with price risk management activities of ILX Holdings, ILX Holdings II and the Castex Sellers as these financial instruments are considered Excluded Assets under the Purchase Agreements and are not included in the Transactions.

(d) Reflects the exclusion of joint interest partner credits associated with the Katmai Field which is considered an Excluded Asset for ILX Holdings II under the applicable Purchase Agreement and are not included in the Transactions of $0.1 million.

(e) Reflects the exclusion of capitalized oil and natural gas expenditures associated with the discovery of the Katmai Field, which is considered an Excluded Asset under the Purchase Agreements and are not included in the Transactions.

(f) Reflects the exclusion of long-term debt of the Castex Sellers as the long-term debt is considered Excluded Assets under the Purchase Agreements and are not included in the Transactions.

(g) Reflects the elimination of members’ equity for Excluded Assets under the Purchase Agreements.

The following table illustrates the historical income statements of ILX Holdings, ILX Holdings II and the Castex Sellers, including the elimination of expenses associated with specific assets and liabilities not acquired by Talos, that form the Target Assets Historical column on the unaudited combined income statement for the year ended December 31, 2019. Certain reclassifications have been made to the ILX Holdings, ILX Holdings II and the Castex Sellers’ historical financial statements to reflect the comparability of financial information.

	ILX Holdings Historical			ILX Holdings II Historical			Castex 2014 Historical			Castex 2016 Historical			Excluded Assets					Total Target Assets Historical
Revenues:
Oil revenue	$	101,394		$	142,459		$	29,578		$	3,398			—				$	276,829
Natural gas revenue		6,381			6,671			15,910			1,812			—					30,774
NGL revenue		3,345			4,316			3,168			339			—					11,168
Total revenue		111,120			153,446			48,656			5,549			—					318,771
Operating expenses:
Lease operating expense		35,549			38,483			24,954			2,699			(95	)	(a	)		101,590
Production taxes		—			—			1,342			193			—					1,535
Depreciation, depletion and amortization		26,282			78,091			27,220			2,114			—					133,707
Write-down on oil and natural gas properties		—			12,603			57,927			—			—					70,530
Accretion expense		357			1,196			3,060			276			(144	)	(a	)		4,745
General and administrative expense		7,148			6,762			5,950			385			(625	)	(b	)		19,620
Total operating expenses		69,336			137,135			120,453			5,667			(864	)				331,727
Operating income (loss)		41,784			16,311			(71,797	)		(118	)		864					(12,956	)
Interest expense		—			(2,919	)		(1,367	)		(67	)		4,353		(c	)		—
Price risk management activities (expense) income		(6,014	)		1,108			464			—			4,442		(d	)		—
Other income		597			—			2			—			—					599
Net income (loss)	$	36,367		$	14,500		$	(72,698	)	$	(185	)		9,659				$	(12,357	)

(a) Reflects the removal of direct lease operating expense associated with the Katmai Field which is considered an Excluded Asset for ILX Holdings II from the Transactions under the applicable Purchase Agreement.

(b) Reflects the elimination of a certain settlement recorded in the ILX Target Entities’ consolidated statements of operations during the year ended December 31, 2019, which pertains to Excluded Assets under the Purchase Agreement.

(c) Reflects the exclusion of interest expense associated with debt instruments held by ILX Holdings II and the Castex Sellers as the interest expense associated with debt instruments which are not included in the Transactions.

(d) Reflects the elimination of price risk management income (expense) associated with derivatives held by ILX Holdings, ILX Holdings II and the Castex Sellers, which are considered Excluded Assets under the Purchase Agreements.

Note 3. Preliminary Purchase Price Allocation

Preliminary Estimated Purchase Price

The unaudited pro forma combined financial statements were prepared using the acquisition method of accounting with Talos as the accounting acquirer of the Target Assets. Under the acquisition method of accounting, the purchase price is allocated to the identifiable tangible and intangible assets acquired and liabilities assumed based on their respective fair values, with any excess purchase price allocated to goodwill.

7

The ILX and Castex Acquisition was consummated pursuant to separate Purchase Agreements for aggregate consideration consisting of (i) $385.0 million in cash subject to customary closing adjustments and (ii) an aggregate 110,000 Preferred Shares which subsequently converted to 11.0 million shares of Conversion Stock on March 30, 2020.

The following table summarizes the purchase price, subject to customary post-closing adjustments (in thousands, except per share data):

Talos Conversion Stock		11,000
Talos Common Stock price per share(1)	$	14.20
Conversion Stock value	$	156,200
Cash consideration	$	385,000
Customary closing adjustments		(88,034	)
Net cash consideration paid at closing	$	296,966
Total purchase price	$	453,166

(1) Represents the closing price of the Company’s Common Stock on February 28, 2020, the date of the closing of the ILX and Castex Acquisition. The purchase price was based on the value of the Conversion Stock as the value approximates the value of the Preferred Shares as a result of the automatic conversion and dividend rights described in that certain Certificate of Designation, Preferences, Rights and Limitations.

While the Company has substantially completed the determination of the fair values of the assets acquired and liabilities assumed, the Company is still finalizing the fair value analysis related to the oil and natural gas properties acquired and asset retirement obligations assumed. The Company anticipates finalizing the determination of fair values by December 31, 2020.

The following table presents the preliminary allocation of the purchase price to the assets acquired and liabilities assumed, (in thousands):

Current assets(1)	$	12,734
Property and equipment		489,701
Other long-term assets		252
Current liabilities		(8,355	)
Other long term liabilities		(41,166	)
Allocated purchase price	$	453,166

(1) Includes trade and other receivables of $7.1 million, which the Company expects all to be realizable.

Note 4. Pro Forma Adjustments

The following adjustments and assumptions were made in the preparation of the unaudited pro forma combined consolidated balance sheets:

(a) Represents adjustments to reflect the preliminary purchase price allocation to proved and unproved oil and natural gas properties estimated at their fair values as discussed in Note 3 — Preliminary Purchase Price Allocation.

(b) Reflects an adjustment to fair value of an investment in two limited liability companies which own interests in a deepwater floating production system.

(c) Reflects adjustments to accounts payable to include estimated transaction costs totaling $10.1 million, which are offset as an increase to accumulated deficit. These costs represent direct, incremental costs of the Transactions, which are not yet reflected in the historical financial statements of Talos, ILX Holdings, ILX Holdings II and the Castex Sellers. The adjustment does not reflect possible expenditures related to restructuring or integration activities that have yet to be determined.

8

(d) Reflects adjustments to the asset retirement obligations assumed using the Company’s estimates and credit-adjusted risk-free interest rate.

(e) Reflects an increase of $297.0 million in long-term debt attributable to additional borrowings under the revolving bank credit facility to fund the cash portion of the purchase price for the acquisition of the Target Assets as discussed in Note 3 — Preliminary Purchase Price Allocation. Of the additional borrowings, $31.8 million was paid in escrow by the Company contemporaneously with the execution of the Purchase Agreements.

(f) Reflects the pro forma adjustments associated with the Transactions, based on a blended federal and state statutory tax rate of 24.1%. The Transactions are treated as a purchase of assets or interest for income tax purposes. There is no difference between book and tax basis of the Target Assets, thus no pro forma adjustment is needed to reflect an adjustment to deferred taxes.

(g) Reflects the elimination of the historical members’ equity of ILX Holdings, ILX Holdings II and the Castex Sellers in conjunction with the closing of the Transactions.

(h) Reflects an increase to the Company’s common stock and additional paid-in capital to reflect the conversion of 11 million shares of the Conversion Stock as part of the purchase price consideration based on the share price of $14.20 representing the closing price of Talos’ common stock on the Closing Date.

The following adjustments and assumptions were made in the preparation of the unaudited pro forma combined statement of operations:

(i) Reflects the elimination of dry hole and geological costs recognized by ILX Holdings and ILX Holdings II, which was based on their accounting policies which followed the successful method of accounting for oil and natural gas properties.

(j) Reflects the change in depletion that would have been recorded with respect to the fair value attributable to proved oil and natural gas properties acquired as a result of the application of the full cost method of accounting for oil and natural gas activities following the ILX and Castex Acquisition. The pro forma depletion rate for the year ended December 31, 2019 was estimated using the proved property amounts based on the preliminary purchase price allocation and estimates of reserves as of the Closing Date, adjusted for actual production.

(k) Reflects the elimination of the write-down of oil and natural gas properties recognized by ILX Holdings II and Castex 2014 as a result of a pro forma ceiling test calculation. ILX Holdings II’s impairment was based on its accounting policies which followed the successful efforts method of accounting for oil and natural gas properties. Castex 2014’s impairment was based on its accounting policies which followed the full cost method of accounting for oil and natural gas properties. The pro forma ceiling test calculation was performed using the pro forma combined present value of future net revenues from proved reserves discounted at 10%, plus the estimated fair value of combined unproved oil and natural gas properties based on the preliminary purchase price allocation. For the year ended December 31, 2019, there would have been no ceiling test write-down on oil and natural gas properties recognized when considering the combined proved oil and natural gas properties.

(l) Reflects the elimination of direct, incremental costs of the ILX and Castex Acquisition reflected in the Company’s, ILX Holdings, ILX Holdings II and the Castex Sellers’ historical consolidated statements of operations during the year ended December 31, 2019.

(m) Reflects an increase in interest expense associated with $297.0 million of additional borrowings under the revolving bank credit facility to fund the ILX and Castex Acquisition.

Interest on borrowings under the revolving bank credit facility is based on a current rate of LIBOR plus 3.25%. These borrowings bear interest at variable rates and are subject to interest rate risk. A 1/8% change to the interest rate would result in a change in interest expense related to variable rate financing of $0.4 million for the year ended December 31, 2019.

9

(n) Reflects the impact of the change in tax status of the Target Assets from being treated as a partnership for U.S. federal and state income tax purposes to an entity subject to federal and state income taxes. As of December 31, 2019, the Company’s valuation allowance primarily relates to various state operating loss, carry forwards and foreign deferred tax assets.

(0) The weighted average basic and diluted shares of common stock outstanding was calculated assuming that the 11 million shares of Conversion Stock issued to the Sellers were outstanding as of January 1, 2019.

Note 5. Pro Forma Supplemental Oil and Natural Gas Reserve Information

The following schedules reflect Talos, ILX Holdings, ILX Holdings II and the Castex Sellers combined supplemental information regarding oil and natural gas producing activities, giving effect to the Transactions as if closing had occurred on January 1, 2019. The following estimates of proved oil and natural gas reserves, both developed and undeveloped, represent combined estimated quantities of crude oil and natural gas, which geological and engineering data demonstrate with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions. Proved developed oil and natural gas reserves are the quantities expected to be recovered through existing wells with existing equipment and operating methods. Proved undeveloped oil and natural gas reserves are reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells for which relatively minor expenditures are required for completion.

There are numerous uncertainties inherent in estimating quantities and values of proved reserves and in projecting future rates of production, the amount and timing of development expenditures and underlying future cash flows, including many factors beyond the property owner’s control. Reserve engineering is a subjective process of estimating the recovery from underground accumulations of oil, natural gas and NGLs that cannot be measured in an exact manner, and the accuracy of any reserve estimate is a function of the quality of available data and of engineering and geological interpretation and judgment. Because all reserve estimates are to some degree subjective, the quantities of oil, natural gas and NGLs that are ultimately recovered, production and operating costs, the amount and timing of future development expenditures and future oil, natural gas and NGLs sales prices may each differ from those assumed in these estimates. In addition, different reserve engineers may make different estimates of reserve quantities and cash flows based upon the same available data.

Pro Forma Estimated Quantities of Proved Oil, Natural Gas and NGL Reserves

The following table presents pro forma estimated proved reserves at the net ownership interests.

	Talos Historical												Target Assets												Pro Forma Combined Company
	Oil			Natural Gas			NGL			Total			Oil			Natural Gas			NGL			Total			Oil			Natural Gas			NGL			Total
	(MMBbl)			(MMcf)			(MMBoe)			(MMBoe)			(MMBbl)			(MMcf)			(MMBoe)			(MMBoe)			(MMBbl)			(MMcf)			(MMBoe)			(MMBoe)
Total proved reserves as of December 31, 2018		112,539			171,024			10,696			151,739			23,558			111,998			3,948			46,172			136,097			283,022			14,644			197,911
Extensions and discoveries		11,518			21,552			620			15,730			—			—			—			—			11,518			21,552			620			15,730
Production		(13,844	)		(23,306	)		(1,228	)		(18,956	)		(4,564	)		(12,162	)		(497	)		(7,088	)		(18,408	)		(35,468	)		(1,725	)		(26,044	)
Revision in estimate		(5,553	)		(15,898	)		(1,237	)		(9,440	)		859			(11,570	)		(343	)		(1,412	)		(4,694	)		(27,468	)		(1,580	)		(10,852	)
Purchases of reserves		2,094			2,626			130			2,662			117			953			—			276			2,211			3,579			130			2,938
Total proved reserves as of December 31, 2019		106,754			155,998			8,981			141,735			19,970			89,219			3,108			37,948			126,724			245,217			12,089			179,683
Proved developed reserves December 31, 2019		72,016			115,381			6,733			97,979			14,965			68,590			1,819			28,216			86,981			183,971			8,552			126,195
Proved undeveloped reserves December 31, 2019		34,738			40,617			2,248			43,756			5,005			20,629			1,289			9,732			39,743			61,246			3,537			53,488

10

During 2019 the pro forma proved reserves of the combined company decreased by 18.2 MMBoe of proved reserves, primarily attributable to 26.0 MMBoe of production and a revision of previous estimates of 10.9 MMBoe primarily due to the Phoenix and Ram Powell Fields. The decrease was partially offset by the addition of 15.7 MMBoe of estimated proved reserves from and extensions and discoveries primarily from an evaluation of Green Canyon 21, Pompano and Ewing Bank 305 as well as 3.0 MMBoe added through purchases from the Gunflint Field located in the Mississippi Canyon area.

Pro Forma Standardized Measure of Discounted Future Net Cash Flows

The following table reflects the pro forma standardized measure of discounted future net cash flows at the net ownership interest in proved oil, natural gas and NGL reserves (in thousands)

At December 31, 2019	Talos Historical			Target Assets			Pro Forma Combined
Future cash inflows	$	7,151,875		$	1,378,783		$	8,530,658
Future costs:
Production		(1,633,432	)		(423,031	)		(2,056,463	)
Development and abandonment		(1,464,270	)		(223,775	)		(1,688,045	)
Future income tax expense		(662,317	)		—			(662,317	)
Future net cash flows after income taxes		3,391,856			731,977			4,123,833
Discount at 10% annual rate		(854,261	)		(172,445	)		(1,026,706	)
Standardized measure of discounted future net cash flows	$	2,537,595		$	559,532		$	3,097,127

In the foregoing determination of future cash inflows, sales prices used for gas and oil for December 31, 2019 were estimated using the average price during the 12-month period, determined as the unweighted arithmetic average of the first-day-of-the-month price for each month. Prices were adjusted by lease for quality, transportation fees and regional price differentials. See the following table for commodity prices used in determining the standardized measure:

	Talos		ILX Holdings		ILX Holdings II		Castex 2014		Castex 2016
Oil price per Bbl	$	61.01	$	58.11	$	57.25	$	53.95	$	53.95
Natural gas price per Mcf	$	2.59	$	2.10	$	2.07	$	2.50	$	2.50
NGL price per Bbl	$	26.17	$	14.18	$	13.44		—		—

It is not intended that the standardized measure of discounted future net cash flows represents the fair market value of the Company’s proved reserves. The Company cautions that the disclosures shown are based on estimates of proved reserve quantities and future production schedules which are inherently imprecise and subject to revision, and the 10% discount rate is arbitrary. In addition, costs and prices as of the measurement date are used in the determinations, and no value may be assigned to probable or possible reserves.

Pro Forma Changes in Standardized Measure of Discounted Future Net Cash Flows

Pro Forma changes in the standardized measure of discounted future net cash flows relating to proved oil and natural gas reserves are as follows:

	Talos Historical			Target Assets			Pro Forma Combined
Standardized measure, beginning of year	$	3,340,246		$	943,291		$	4,283,537
Sales and transfers of oil, net gas and NGLs produced during the period		(665,226	)		(225,340	)		(890,566	)
Net change in prices and production costs		(849,696	)		(213,372	)		(1,063,068	)
Changes in estimated future development costs		(75,564	)		(39,998	)		(115,562	)
Previously estimated development costs incurred		117,049			4,333			121,382
Accretion of discount		392,526			94,329			486,855
Net changes in income taxes		129,590			—			129,590
Purchase of reserves		75,009			4,793			79,802
Extensions and discoveries		306,515			—			306,515
Net change due to revision in quantity estimates		(199,576	)		(21,188	)		(220,764	)
Changes in production rates (timing) and other		(33,278	)		12,684			(20,594	)
Standardized measure, end of year	$	2,537,595		$	559,532		$	3,097,127

11