EX-1

Exhibit 1

LOGO

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated financial statements as of September 30, 2026 and

December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

TABLE OF CONTENTS

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Unaudited interim condensed consolidated statements of profit or loss and other comprehensive income for the nine-month periods ended September 30, 2026 and 2025

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Unaudited interim condensed consolidated statements of financial position as of September 30, 2026 and December 31, 2025

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Unaudited interim condensed consolidated statements of changes in equity for the nine-month periods ended September 30, 2026 and 2025

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Unaudited interim condensed consolidated statements of cash flows for the nine-month periods ended September 30, 2026 and 2025

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Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated statements of profit or loss and other comprehensive income for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars)


	Notes	Period from January 1, through September 30, 2026			Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Revenue from contracts with customers	4		3,394,884			1,755,133			1,294,970			706,135
Cost of sales:
Operating costs	5.1		(192,126	)		(136,140	)		(75,018	)		(51,786	)
Crude oil stock fluctuation	5.2		9,376			4,241			(882	)		1,415
Royalties and others	5.3		(484,479	)		(251,068	)		(198,303	)		(98,523	)
Purchases of crude oil			(31,129	)		—			(15,758	)		—
Depreciation, depletion and amortization	11/12/13		(796,109	)		(513,808	)		(293,200	)		(210,891	)
Other non-cash costs related to the transfer of conventional assets	15		(10,725	)		(24,018	)		(2,804	)		(9,159	)

Gross profit			1,889,692			834,340			709,005			337,191

Selling expenses	6		(286,250	)		(136,289	)		(97,980	)		(48,816	)
General and administrative expenses	7		(139,978	)		(95,090	)		(54,195	)		(37,347	)
Exploration expenses			—			(488	)		—			(144	)
Other operating income	8.1		48,859			504,284			45,536			289,802
Other operating expenses	8.2		(9,461	)		(30,434	)		(5,782	)		(5,273	)
Commodity risk management contracts	2.4.3		(134,429	)		—			10,685			—
Impairment of long-lived assets	2.4.1		—			(38,252	)		—			—
Remeasurement of contingent consideration	24		(16,168	)		—			(16,168	)		—

Operating profit			1,352,265			1,038,071			591,101			535,413

Income (loss) from investments in associates	17		3,471			(3,746	)		3,103			(2,767	)
Interest income	9.1		11,502			8,933			3,321			7,603
Interest expense	9.2		(183,372	)		(113,260	)		(63,992	)		(48,873	)
Other financial income (expense)	9.3		(69,788	)		(63,721	)		(15,908	)		(53,872	)

Financial income (expense), net			(241,658	)		(168,048	)		(76,579	)		(95,142	)

Profit before income tax			1,114,078			866,277			517,625			437,504

Current income tax (expense)	14		(493,169	)		(149,727	)		(251,785	)		(3,119	)
Deferred income tax benefit (expenses)	14		118,104			(83,182	)		32,474			(119,099	)

Income tax (expense)			(375,065	)		(232,909	)		(219,311	)		(122,218	)

Profit for the period, net			739,013			633,368			298,314			315,286

Other comprehensive income
Other comprehensive income that shall not be reclassified to profit (loss) in subsequent periods
- (Loss) from actuarial remeasurement related to employee benefits	25		(4,479	)		(1,901	)		(47	)		(47	)
- Deferred income tax benefit	14		1,569			665			17			16

Other comprehensive income for the period			(2,910	)		(1,236	)		(30	)		(31	)

Total comprehensive profit for the period			736,103			632,132			298,284			315,255

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated statements of profit or loss and other comprehensive income for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars)


	Notes	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025		Period from July 1, through September 30, 2026		Period from July 1, through September 30, 2025
Profit for the period, net attributable to:
Shareholders of the parent company			722,905		633,368		293,457		315,286
Non-controlling interests	1.2.1		16,108		—		4,857		—
Total comprehensive profit for the period attributable to:
Shareholders of the parent company			719,995		632,132		293,427		315,255
Non-controlling interests	1.2.1		16,108		—		4,857		—
Earnings per share
Basic (in US Dollars per share)	10.1		6.683		6.215		2.645		3.006
Diluted (in US Dollars per share)	10.2		6.355		5.976		2.516		2.908

Notes 1 through 31 are an integral part of these unaudited interim condensed consolidated financial statements.

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated statements of financial position as of September 30, 2026 and December 31, 2025

(Amounts expressed in thousands of US Dollars)


	Notes		As of September 30, 2026			As of December 31, 2025
Assets
Noncurrent assets
Property, plant and equipment		11		7,673,139			5,543,032
Goodwill		12		22,576			22,576
Other intangible assets		12		14,689			18,485
Right-of-use assets		13		102,614			153,283
Biological assets				19,451			15,855
Investments in associates		17		88,955			54,542
Trade and other receivables		15		482,778			373,026
Deferred income tax assets				36,514			36,514

Total noncurrent assets				8,440,716			6,217,313

Current assets
Inventories		18		21,513			9,457
Trade and other receivables		15		522,764			347,681
Cash, bank balances and other short-term investments		19		785,044			538,402

Total current assets				1,329,321			895,540

Total assets				9,770,037			7,112,853

Equity and liabilities
Equity
Capital stock		20.1		760,781			491,165
Other equity instruments				32,144			32,144
Other equity accounts		20.3		72,909			—
Legal reserve		20.2		10,560			8,233
Share-based payments				(43,513	)		(32,765	)
Share repurchase reserve		20.2		329,324			179,324
Other accumulated comprehensive income (losses)				(13,944	)		(11,034	)
Accumulated profit (losses)				2,415,105			1,844,527

Equity attributable to shareholders of the parent company				3,563,366			2,511,594

Equity attributable to non-controlling interests				194,847			—

Total equity				3,758,213			2,511,594

Liabilities
Noncurrent liabilities
Deferred income tax liabilities				451,604			298,664
Lease liabilities		13		49,188			88,451
Provisions		21		53,703			51,513
Borrowings		16.1		3,078,038			2,803,982
Employee benefits		25		21,017			16,226
Income tax liability				12,802			13,964
Trade and other payables		24		498,929			292,236

Total noncurrent liabilities				4,165,281			3,565,036

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated statements of financial position as of September 30, 2026 and December 31, 2025

(Amounts expressed in thousands of US Dollars)


	Notes		As of September 30, 2026		As of December 31, 2025
Current liabilities
Provisions		21		2,034		10,800
Lease liabilities		13		33,909		55,452
Borrowings		16.1		564,217		350,095
Salaries and payroll taxes		22		29,891		35,891
Income tax liability				411,043		120,910
Other taxes and royalties		23		84,095		43,945
Trade and other payables		24		721,354		419,130

Total current liabilities				1,846,543		1,036,223

Total liabilities				6,011,824		4,601,259

Total equity and liabilities				9,770,037		7,112,853

Notes 1 through 31 are an integral part of these unaudited interim condensed consolidated financial statements.

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated statement of changes in equity for the nine-month period ended September 30, 2026

(Amounts expressed in thousands of US Dollars)


	Capital stock			Other equity instruments		Other equity accounts ⁽¹⁾			Legal reserve		Share-based payments			Share repurchase reserve		Other accumulated comprehensive income (losses)			Accumulated profit (losses)			Equity attributable to shareholders of the parent company			Equity attributable to non- controlling interests		Total equity
Amounts as of December 31, 2025		491,165			32,144		—			8,233		(32,765	)		179,324		(11,034	)		1,844,527			2,511,594			—		2,511,594

Profit for the period, net		—			—		—			—		—			—		—			722,905			722,905			16,108		739,013
Other comprehensive income for the period		—			—		—			—		—			—		(2,910	)		—			(2,910	)		—		(2,910	)

Total comprehensive income		—			—		—			—		—			—		(2,910	)		722,905			719,995			16,108		736,103

Ordinary General Shareholder’s meeting on April 28, 2026 ⁽²⁾:
Creation of legal reserve		—			—		—			2,327		—			—		—			(2,327	)		—			—		—
Creation of share repurchase reserve		—			—		—			—		—			150,000		—			(150,000	)		—			—		—
Board of Directors’ Meeting on May 7, 2026:
Issuance of Serie A shares ⁽³⁾		325,000			—		84,488			—		—			—		—			—			409,488			—		409,488
Transactions with non-controlling interest ⁽¹⁾		—			—		(11,579	)		—		—			—		—			—			(11,579	)		178,739		167,160
Share repurchase ⁽⁴⁾		(55,385	)		—		—			—		—			—		—			—			(55,385	)		—		(55,385	)
Share-based payments		1			—		—			—		(10,748	)⁽⁵⁾		—		—			—			(10,747	)		—		(10,747	)

Amounts as of September 30, 2026		760,781			32,144		72,909			10,560		(43,513	)		329,324		(13,944	)		2,415,105			3,563,366			194,847		3,758,213

⁽¹⁾	See Note 20.3.

⁽²⁾	See Note 20.2.

⁽³⁾	See Note 20.1 and 1.2.1.

⁽⁴⁾	See Note 20.1.

⁽⁵⁾	Including 58,907 of expenses (Note 7).

Notes 1 through 31 are an integral part of these unaudited interim condensed consolidated financial statements.

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated statement of changes in equity for the nine-month period ended September 30, 2025

(Amounts expressed in thousands of US Dollars)


	Capital stock			Other equity instruments		Legal reserve		Share- based payments			Share repurchase reserve		Other accumulated comprehensive income (losses)			Accumulated profit (losses)			Total equity
Amounts as of December 31, 2024		398,064			32,144		8,233		45,628			129,324		(11,057	)		1,018,877			1,621,213

Profit for the period, net		—			—		—		—			—		—			633,368			633,368
Other comprehensive income for the period		—			—		—		—			—		(1,236	)		—			(1,236	)

Total comprehensive income		—			—		—		—			—		(1,236	)		633,368			632,132

Ordinary General Shareholder’s meeting on April 9, 2025:
Creation of share repurchase reserve ⁽¹⁾		—			—		—		—			50,000		—			(50,000	)		—
Board of Directors’ Meeting on April 11, 2025:
Issuance of Serie A shares ^(2) (3)		299,687			—		—		—			—		—			—			299,687
Share repurchase ⁽²⁾		(50,000	)		—		—		—			—		—			—			(50,000	)
Share-based payments		1			—		—		(95,414	)⁽⁴⁾		—		—			—			(95,413	)

Amounts as of September 30, 2025		647,752			32,144		8,233		(49,786	)		179,324		(12,293	)		1,602,245			2,407,619

⁽¹⁾	See Note 20.2.

⁽²⁾	See Note 20.1.

⁽³⁾	See Note 1.2.2 and 32 to the annual consolidated financial statements as of December 31, 2025.

⁽⁴⁾	Including 37,918 of expenses (Note 7).

Notes 1 through 31 are an integral part of these unaudited interim condensed consolidated financial statements.

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated statements of cash flows for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars)


	Notes		Period from January 1, through September 30, 2026			Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Cash flows from operating activities:
Profit for the period, net				739,013			633,368			298,314			315,286
Adjustments to reconcile net cash flows
Items related to operating activities:
Allowance for expected credit losses		6		—			44			(26	)		44
Share-based payments		7		58,907			37,918			21,017			18,401
Personal assets tax		7		9,792			(1,104	)		2,527			—
Net increase in provisions		8.2		6,748			1,713			4,389			295
Net changes in foreign exchange rate		9.3		10,355			(14,862	)		67			21,546
Discount of assets and liabilities at present value		9.3		26,207			13,819			5,367			10,471
Discount for well plugging and abandonment		9.3		2,642			1,743			760			907
Income tax expense		14		375,065			232,909			219,311			122,218
Other non-cash costs related to the transfer of conventional assets		15		10,725			24,018			2,804			9,159
Employee benefits		25		682			592			274			196
Remeasurement of contingent consideration		24		16,168			—			16,168			—
Items related to investing activities:
Gain from assets disposal		8.1		(21,068	)		—			(21,068	)		—
Gain from Business Combination		8.1		—			(490,530	)		—			(288,056	)
Interest income		9.1		(11,502	)		(8,933	)		(3,321	)		(7,603	)
Changes in the fair value of financial assets and liabilities		9.3		(10,906	)		(14,107	)		(3,628	)		1,942
Depreciation and depletion		11/13		787,782			507,433			290,050			208,766
Amortization of intangible assets		12		8,327			6,375			3,150			2,125
Impairment of long-lived assets		2.4.1		—			38,252			—			—
Income (loss) from investment in associates		17		(3,471	)		3,746			(3,103	)		2,767
Items related to financing activities:
Interest expense		9.2		183,372			113,260			63,992			48,873
Amortized cost		9.3		4,416			7,826			1,721			1,143
Interest expense on lease liabilities		9.3		2,432			2,565			724			857
Other taxes interest		9.3		5,476			53,127			3,858			14,440
Other financial income (expense)		9.3		29,166			13,610			7,039			2,566
Changes in working capital:
Trade and other receivables				(185,285	)		(230,438	)		(57,997	)		(115,048	)
Inventories		5.2		(9,376	)		(4,241	)		882			(1,415	)
Trade and other payables				64,527			(24,770	)		(10,518	)		55,054
Payments of employee benefits		25		(370	)		(388	)		(128	)		(112	)
Salaries and payroll taxes				(54,810	)		(120,191	)		(15,598	)		7,489
Other taxes and royalties				773			(21,840	)		18,561			50,806
Provisions		8.2		(5,586	)		(638	)		(55	)		—
Income tax payment				(175,717	)		(399,381	)		(53,923	)		(179,226	)

Net cash flows provided by operating activities				1,864,484			360,895			791,610			303,891

VISTA ENERGY, S.A.B. DE C.V.

Unaudited interim condensed consolidated statements of cash flows for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars)


	Notes	Period from January 1, through September 30, 2026			Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Cash flows from investing activities:
Payments for acquisitions of property, plant and equipment and biological assets			(1,286,240	)		(1,116,249	)		(448,664	)		(334,169	)
Payment for Business Combination, net of cash acquired	1.2.1/29		(666,404	)		(841,555	)		—			—
Proceeds from BSP and Bajo del Toro Sale	1.2.1		203,907			—			—			—
Payments for acquisitions of other intangible assets	12		(4,531	)		(3,762	)		(1,433	)		(1,286	)
Proceeds from assets disposal	1.2.3		10,000			—			10,000			—
Proceeds from the transfer of conventional assets	15		—			5,734			—			—
Payments for acquisition of investments in associates	17		(30,942	)		(42,508	)		(10,917	)		(4,877	)
Interest received	9.1		11,502			8,933			3,321			7,603

Net cash flows (used in) investing activities			(1,762,708	)		(1,989,407	)		(447,693	)		(332,729	)

Cash flows from financing activities:
Proceeds from borrowings	16.2		1,847,217			2,219,917			402,000			500,000
Payment of borrowings principal	16.2		(1,401,657	)		(806,032	)		(462,414	)		(193,285	)
Payment of borrowings interest	16.2		(138,349	)		(73,677	)		(23,611	)		(19,443	)
Payment of borrowings cost	16.2		(6,736	)		(17,888	)		(833	)		(7,663	)
Payments of other taxes interest	9.3		(3,824	)		(21,075	)		(2,206	)		(10,819	)
Payments of other financial income (expense)	9.3		(22,100	)		(7,435	)		(8,691	)		(2,566	)
Payment of lease	13		(56,628	)		(58,035	)		(12,012	)		(11,251	)
Share repurchase	20.1		(55,385	)		(50,000	)		(55,385	)		(50,000	)

Net cash flow provided by (used in) financing activities			162,538			1,185,775			(163,152	)		204,973

Net increase (decrease) in cash and cash equivalents			264,314			(442,737	)		180,765			176,135
Cash and cash equivalents at beginning of period	19		526,184			755,610			597,022			147,000
Effect of exposure to changes in the foreign currency rate and other financial results of cash and cash equivalents			(11,665	)		1,827			1,046			(8,435	)
Net increase (decrease) in cash and cash equivalents			264,314			(442,737	)		180,765			176,135

Cash and cash equivalents at end of period	19		778,833			314,700			778,833			314,700

Significant transactions that generated no cash flows
Business Combination transactions through the issuance of Serie A shares and an increase in trade and other payables	1.2.1 / 29		717,409			506,754			—			—
BSP and Bajo del Toro Sale through an increase in trade and other receivables	1.2.1		62,267			—			—			—
Acquisition of property, plant and equipment through increase in trade and other payables			342,515			160,124			342,515			160,124
Acquisition of property, plant and equipment through increase in trade and other payables related to the Farmout Agreement			—			109,538			—			—
Changes in well plugging and abandonment with an impact in property, plant and equipment	11		(3,494	)		1,768			(11,822	)		10,649

Notes 1 through 31 are an integral part of these unaudited interim condensed consolidated financial statements.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 1. Group information

1.1 Company general information

Vista Energy, S.A.B. de C.V. (“VISTA”, the “Company” or the “Group”), was organized as a variable-capital stock company on March 22, 2017, under the laws of the United Mexican States (“Mexico”). The Company adopted the public corporation or “Sociedad Anónima Bursátil de Capital Variable” (“S.A.B. de C.V.”) on July 28, 2017.

It is listed on the New York Stock Exchange (“NYSE”) under ticker symbol “VIST” as from July 26, 2019.

Its main office is located in City of Mexico, Mexico, at Mapfre Tower, Paseo de la Reforma Avenue 243, 18th floor, Colonia Cuauhtémoc, Alcaldía Cuauhtémoc, zip code 06500.

As of September 30, 2026, and December 31, 2025, the Company’s main activity, through its subsidiaries, is the exploration and production of crude oil and natural gas (“Upstream”).

Except as mentioned in Notes 1.2, there were no significant changes in the Group’s structure and activities as from the date of issuance of the annual consolidated financial statements as of December 31, 2025.

1.2 Significant transactions for the period

1.2.1 Acquisition of Equinor Argentina S.A.U. (“Equinor” currently Bandurria Sur Participaciones S.A. “BSP”) and Bajo del Toro block

On February 2, 2026, the Company and its subsidiary Vista Argentina signed several agreements including the following transactions:

(i) the acquisition of 100% of Equinor’s capital stock, which holds a 30% interest in the Bandurria Sur block; and the acquisition of a 50% interest in the Bajo del Toro block from Equinor Argentina B.V. Sucursal Argentina (the “BSP and Bajo del Toro Acquisition”);

(ii) the sale of a 16.3% interest in Equinor’s capital stock, including, indirectly, the assignment of a 4.9% interest in Bandurria Sur, and the assignment of a 15% interest in the Bajo del Toro block to YPF S.A. (“YPF”) (the “BSP and Bajo del Toro Sale”).

As from this corporate restructuring, Vista holds: (i) a 30% non-operated interest in the Bandurria Sur unconventional hydrocarbon concession (25.1% attributable to the shareholders of the parent company and 4.9% attributable to the non-controlling interest); (ii) a 35% non-operated interest in Bajo del Toro block; and (iii) certain midstream transport agreements.

Under the terms of the BSP and Bajo del Toro Acquisition, the total consideration amounted to 1,439,606, broken down as follows:

(i) 722,197 paid in cash, comprising 550,000 attributable to the purchase price and 172,197 for purchase price adjustments related to changes in cash, debt, working capital, capital contributions, leakage and other adjustments;

(ii) 409,488 through the transfer of 6,223,220 American Depositary Shares (“ADSs”) representing an equivalent number of subscribed Series A shares, subject to lock-up restrictions, and

(iii) a contingent consideration liability assumed of 307,921, calculated as follows: (a) the price per barrel equal to the average Brent crude oil price for the previous year less USD 65/bbl, subject to a floor of USD 0/bbl where the average Brent price is equal to or less than USD 65/bbl, and a cap of USD 15/bbl where the average Brent is equal to or greater than USD 80/bbl, multiplied by (b) the annual production attributable to the Company’s interest in the assets. This contingent price will be calculated annually and payable during a five-year period as from the closing date, accruing no interest.

Under the terms of the BSP and Bajo del Toro Sale, as mentioned above, the Company received cash of 203,907 and recognized a contingent consideration receivable of 62,267.

This transaction closed on May 7, 2026. Since that date, the Company consolidates 100% of BSP’s assets, liabilities, and results, recognizing a 16.3% non-controlling interest in consolidated equity in accordance with IFRS accounting Standards (“IFRS”) 10 – “Consolidated Financial Statements”.

For additional information, see Note 29.2.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

1.2.2 Assignment of the non-operated interest in the Acambuco conventional exploitation concession

On April 7, 2026, the Company, through its subsidiary Vista Argentina, entered into an agreement with Pan American Energy, S.L., Sucursal Argentina (“Pan American”), to assign its 1.5% non-operated interest in the Acambuco conventional exploitation concession. The assignment was subject to the fulfillment of certain conditions precedent (the “Closing Date”), and the total consideration amounted to 600, payable by Pan American within 10 business days following the closing date of such assignment.

This transaction closed on October 9, 2026. Since that date, Pan American assumes all economic rights relating to the aforementioned concession, notwithstanding that the decree of the Province of Salta authorizing the assignment of title to the area to Pan American remains pending.

1.2.3 Assignment of the interest in the conventional areas to Tango Energy Argentina S.A. (“Tango Energy”) and the unconventional development rights to Unconventional Resources S.A. (“URSA”)

On May 8, 2026, through Provincial Decree No. 509/2026, the Province of Río Negro approved the assignment of 100% of Vista Argentina’s interests to Tango Energy related to:

(i) the conventional exploitation concessions of the Entre Lomas, Jarilla Quemada, Jagüel de los Machos, 25 de mayo-Medanito SE and Charco del Palenque areas; and

(ii) the Entre Lomas and Jarilla Quemada gas transportation concessions, and the 25 de mayo-Medanito SE crude oil transportation concession.

The decree also approved the conversion of the exploitation concessions into unconventional hydrocarbon exploitation concessions (CENCH, by its Spanish acronym) with a term of 35 years, for:

(i) the entire Charco del Palenque and Jarilla Quemada areas, and

(ii) a portion of the Entre Lomas area, while the remaining surface area remains under the existing exploitation concession.

On July 3, 2026, the Company entered into an agreement with URSA, a company controlled by Vista and Trafigura Ventures V B.V. (“Trafigura”), for the assignment of a 50% interest in the unconventional development rights in the Charco del Palenque, Jarilla Quemada and Entre Lomas areas. The agreement includes an upfront payment of 10,000 and certain additional payments linked to the level of activity in those areas.

As of September 30, 2026, the Company recognized: (i) a gain of 21,068 in “Other operating income,” under “Gain from assets disposal” (Note 8.1); (ii) cash proceeds of 10,000; and (iii) a receivable of 11,763 in “Trade and other receivables”, under “Accounts receivable from third parties” (Note 15).

As of the date of issuance of these unaudited interim condensed consolidated financial statements, Tango Energy and URSA operate all these areas.

Note 2. Basis of preparation and material accounting policies

2.1 Basis of preparation and presentation

These unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025, and for the nine-month periods ended September 30, 2026 and 2025 were prepared in accordance with the International Accounting Standard (“IAS”) 34 – “Interim Financial Reporting”, issued by the International Accounting Standards Board (“IASB”). The Company prepared its interim financial statements on a condensed basis pursuant to IAS 34. Certain explanatory notes are included to describe the events and transactions that are relevant to understand the changes in the financial position as of September 30, 2026, and the results of operations for the nine-month period ended September 30, 2026. Therefore, these unaudited interim condensed consolidated financial statements do not include all the information and disclosures required in the annual financial statements and should be read together with the annual consolidated financial statements as of December 31, 2025.

These unaudited interim condensed consolidated financial statements were prepared using the same accounting policies as used in preparing the Company’s annual consolidated financial statements as of December 31, 2025, except for the income tax expense that is recognized in each interim period based on the best estimate of the weighted average annual income tax rate expected for the full financial year.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

They were prepared on a historical cost basis, except for certain financial assets and liabilities that were measured at fair value. The figures contained herein are stated in US Dollars (“USD”) and are rounded to the nearest thousand, unless otherwise stated.

These unaudited interim condensed consolidated financial statements were approved for publication by the Board of Directors on October 28, 2026 and the subsequent events through that date are considered (Note 30).

2.2 New effective accounting standards, amendments and interpretations issued by the IASB adopted by the Company

The Company has not early adopted any standard, interpretation or amendment that has been issued but is not yet effective.

None of the accounting pronouncements applicable after December 31, 2025, and as of the date of these unaudited interim condensed consolidated financial statements had a material effect on the Company’s financial condition or result of its operations.

2.3 Basis of consolidation

These unaudited interim condensed consolidated financial statements contain the financial statements of the Company and its subsidiaries. Except as mentioned in Notes 1.2, there were no other significant changes in interest in Company subsidiaries during the nine-month period ended September 30, 2026.

2.4 Summary of material accounting policies

2.4.1 Impairment of goodwill and property, plant and equipment, right-of-use assets and other intangible assets (“long-lived assets”) other than goodwill

Long-lived assets are tested for impairment at the lowest level in which there are separately identifiable cash flows largely independent of the cash flows of other Cash Generating Units (“CGUs”).

The Company conducts its impairment test of long-lived assets when there is an indication that the carrying amount may be impaired. Moreover, Goodwill is tested every December. The Company bases the impairment test on the calculation of value in use and reviews the relationship between the recoverable amount and the carrying amount of its assets.

As of September 30, 2026, the Company did not identify trigger events related to goodwill and long-lived assets other than goodwill.

However, as of September 30, 2025, the Company identified impairment indicators related to the CGU in Mexico. Consequently, the Company performed an impairment test and recorded a full impairment of the assets amounting to 38,252.

See Note 3.2.2 to the annual consolidated financial statements as of December 31, 2025.

2.4.2 Business combination

The acquisition method is used to book business combinations, regardless of whether equity instruments or other assets are acquired. The consideration transferred for these acquisitions comprises:

(i)	The fair value of transferred assets;

(ii)	The liabilities incurred to former owners of the acquired business;

(iii)

The equity interests issued by the Company;

(iv)	The fair value of any asset or liability from a contingent consideration arrangement; and

(v)	The fair value of any previously held equity interest in the subsidiary.

Identifiable assets acquired and liabilities assumed in a business combination are initially measured at fair values at the date acquisition.

The costs related to the acquisition are booked as incurred expenses. Goodwill is an excess of:

(i)	The consideration transferred; and

(ii)	The fair value of net identifiable assets acquired.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

If the fair value of the acquiree’s net identifiable assets exceeds these amounts, before recognizing profit, the Company reassesses whether it has correctly identified all assets acquired and liabilities assumed, reviewing the procedures employed to measure the amounts to be recognized at the acquisition date. If the assessment still results in excess of the fair value of net assets acquired in relation to the total consideration transferred, gain from a bargain purchase is recognized directly in the consolidated statements of profit or loss and other comprehensive income, under “Gain from Business Combination” within “Other operating income”.

When the settlement of any cash consideration is deferred, the future amounts payable is discounted at their present value at the exchange date. The discount rate used is the entity’s incremental borrowing rate, being the rate at which a similar borrowing could be obtained under comparable terms and conditions.

Contingent consideration will be recognized at its fair value at the acquisition date. Contingent consideration is classified as equity or as a financial liability. The amounts classified as a financial liability are remeasured at fair value with changes in fair value through the consolidated statements of profit or loss and other comprehensive income. Contingent consideration classified as equity is not remeasured and its subsequent settlement is accounted for within equity.

When the Company acquires a business, it assesses the financial assets acquired and liabilities incurred in relation to its adequate classification and designation according to contractual terms, economic circumstances and relevant conditions as of the acquisition date.

Oil reserves and resources acquired that may be measured reliably are recognized separately at fair value upon the acquisition.

Other potential reserves, resources and rights, which fair values cannot be measured reliability, are not recognized separately but are considered part of goodwill.

If the business combination is performed in stages, the previously held equity interest in the acquiree is measured at acquisition-date fair value. Profit or loss from such remeasurement is recognized in the consolidated statements of profit or loss and other comprehensive income.

The Company has a maximum period of 12 months from the date of acquisition to finalize the acquisition accounting. When it is incomplete as of the end of the year in which the business combination takes place, the Company reports provisional amounts.

During the nine-month period ended September 30, 2026 and 2025, the Company recorded the BSP and Bajo del Toro Acquisition and the Vista Energy Lach S.A. (“Vista Lach”) acquisition, respectively, as a Business Combination (“Business Combination”) (See Notes 1.2.1 and 29 of these condensed consolidated interim financial statements and Notes 1.2.2 and 32 to the annual consolidated financial statements as of December 31, 2025).

2.4.3 Commodity risk management contracts

The Company has entered into derivative financial instruments to manage its exposure to oil price fluctuation, only for the short term, on a quarterly basis. During the nine-month period ended September 30, 2026, these instruments consisted primarily of ICE Brent futures and fixed-price swaps. The derivatives were executed through international brokers, including exchange-cleared accounts and bilateral agreements under ISDA Master Agreements with financial institutions.

The Company’s derivatives are accounted for as non-hedge derivatives and therefore all changes in the fair values of its derivative contracts are recognized as gains or losses in the results of the periods in which they occur.

For the nine-month period ended September 30, 2026, the Company recorded a loss of 134,429 under “Commodity risk management contracts”.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

2.5 Regulatory framework

A-	Argentina

2.5.1 Regulatory framework for oil and gas activity

(i) Decree No. 105/2026

On February 19, 2026, Decree No. 105/2026 was published in the Official Bulletin, establishing a one-year extension as from July 8, 2026, to join the Incentive Regime for Large Investments (the “RIGI” by Spanish acronym). The decree includes onshore upstream crude oil and natural gas development projects as eligible promoted activities.

The minimum investment amount is set at 600,000. Qualifying projects must be located in areas with no significant development and must ensure segregation and traceability through a separate measurement system in cases where qualifying and non-qualifying activities coexist.

As of the date of issuance of these unaudited interim condensed consolidated financial statements, the Company has submitted an application to admit an upstream development project to the RIGI, which is currently under review and awaiting approval by the relevant authorities.

Other than mentioned above, there have been no significant changes in Argentina’s regulatory framework during the nine-month period ended September 30, 2026 (See Note 2.5 to the annual consolidated financial statements as of December 31, 2025).

B-	Mexico

2.5.2 Exploration and production activities regulatory framework

There have been no significant changes in Mexico’s regulatory framework during the nine-month period ended September 30, 2026 (See Note 2.5 to the annual consolidated financial statements as of December 31, 2025).

Note 3. Segment information

The Chief Operating Decision Maker (the “Committee” or “CODM”) is in charge of allocating resources and assessing the performance of the operating segment. It supervises operating profit (loss), and the performance of the indicators related to its oil and gas properties on an aggregate basis to make decisions regarding the location of resources, negotiate with international suppliers and determine the method for managing contracts with customers.

The CODM considers as a single segment the exploration and production of crude oil, natural gas and Liquefied Petroleum Gas (“LPG”) (including Exploration and Production commercial activities), through its own activities, subsidiaries and interests in joint operations and based on the nature of the business, customer portfolio and risks involved. The Company aggregated no segment as it has only one.

The accounting criteria used by the subsidiaries to measure profit or loss, assets and liabilities of the segments are consistent with those used in these unaudited interim condensed consolidated financial statements.

Note 4. Revenue from contracts with customers

Period from
January 1,
through
September 30,
2026

Period from
January 1,
through
September 30,
2025

Period from
July 1,
through
September 30,
2026

Period from
July 1,
through
September 30,
2025

Goods and services sold

3,394,884

1,755,133

1,294,970

706,135

Total revenue from contracts with customers ⁽¹⁾

3,394,884

1,755,133

1,294,970

706,135

⁽¹⁾	For the nine-month period ended September 30, 2026, 98% recognized at a point in time.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

4.1 Information broken down by revenue from contracts with customers


Type of products	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025		Period from July 1, through September 30, 2026		Period from July 1, through September 30, 2025
Revenues from crude oil sales and other services		3,300,160		1,683,594		1,256,026		676,363
Revenues from natural gas sales		90,406		67,068		38,083		28,641
Revenues from LPG sales		4,318		4,471		861		1,131

Total revenue from contracts with customers		3,394,884		1,755,133		1,294,970		706,135


Distribution channels	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025		Period from July 1, through September 30, 2026		Period from July 1, through September 30, 2025
Exports of crude oil and other services⁽¹⁾		2,444,301		1,026,302		960,603		429,805
Local crude oil		855,859		657,292		295,423		246,558
Local natural gas		84,704		57,614		37,667		25,210
Exports of natural gas		5,702		9,454		416		3,431
LPG sales		4,318		4,471		861		1,131

Total revenue from contracts with customers		3,394,884		1,755,133		1,294,970		706,135

⁽¹⁾	For the nine-month period ended September 30, 2026 including 66,664 of sea freight services.

Note 5. Cost of sales

5.1 Operating costs


	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025		Period from July 1, through September 30, 2026		Period from July 1, through September 30, 2025
Fees and compensation for services		120,016		84,565		47,838		33,325
Salaries and payroll taxes		33,806		24,061		11,955		9,067
Employee benefits		10,293		8,870		3,628		2,830
Transport		8,505		2,856		4,452		1,064
Consumption of materials and spare parts		8,176		4,158		2,824		2,205
Easements and fees		5,584		5,116		1,879		1,423
Other		5,746		6,514		2,442		1,872

Total operating costs		192,126		136,140		75,018		51,786

5.2 Crude oil stock fluctuation


	Period from January 1, through September 30, 2026			Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Crude oil stock at beginning of the period (Note 18)		6,881			4,384			19,193			8,661
Increase from Business Combination (Note 29.2)		2,054			1,451			—			—
Less: Crude oil stock at end of the period (Note 18)		(18,311	)		(10,076	)		(18,311	)		(10,076	)

Total crude oil stock fluctuation		(9,376	)		(4,241	)		882			(1,415	)

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

5.3 Royalties and others


	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025		Period from July 1, through September 30, 2026		Period from July 1, through September 30, 2025
Royalties		356,632		197,035		146,183		79,688
Export duties		127,847		54,033		52,120		18,835

Total royalties and others		484,479		251,068		198,303		98,523

Note 6. Selling expenses


	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025		Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Sea freight		124,453		—		41,361			—
Transport		97,170		85,953		33,190			30,173
Taxes, rates and contributions		29,399		20,926		10,269			8,247
Fees and compensation for services		21,818		14,831		10,064			5,092
Tax on bank account transactions		13,410		14,535		3,122			5,260
Allowances for (reversal of) expected credit losses		—		44		(26	)		44

Total selling expenses		286,250		136,289		97,980			48,816

Note 7. General and administrative expenses


	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026		Period from July 1, through September 30, 2025
Share-based payments		58,907		37,918			21,017		18,401
Salaries and payroll taxes		31,557		31,182			15,704		9,811
Fees and compensation for services		24,859		14,661			9,017		4,164
Personal assets tax		9,792		(1,104	)		2,527		—
Employee benefits		5,376		4,914			2,096		1,803
Institutional promotion and advertising		1,682		1,931			600		826
Other		7,805		5,588			3,234		2,342

Total general and administrative expenses		139,978		95,090			54,195		37,347

Note 8. Other operating income and expenses

8.1 Other operating income


	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025		Period from July 1, through September 30, 2026		Period from July 1, through September 30, 2025
Gain from assets disposal ⁽¹⁾		21,068		—		21,068		—
Reversal of restructuring expenses		19,624		—		19,624		—
Gain from Business Combination ⁽²⁾		—		490,530		—		288,056
Gain from Exports Increase Program		—		4,961		—		—
Other income		8,167		8,793		4,844		1,746

Total other operating income		48,859		504,284		45,536		289,802

⁽¹⁾	See Note 1.2.3.

⁽²⁾	See Note 29.1.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

8.2 Other operating expenses


	Period from January 1, through September 30, 2026			Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Restructuring expenses ⁽¹⁾		(2,713	)		(28,721	)		(1,393	)		(4,978	)
(Provision for) contingencies ⁽²⁾		(340	)		(677	)		(2	)		—
(Provision for) materials and spare parts obsolescence ⁽²⁾		(6,097	)		(881	)		(4,110	)		(256	)
(Provision for) environmental remediation ⁽²⁾		(311	)		(155	)		(277	)		(39	)

Total other operating expenses		(9,461	)		(30,434	)		(5,782	)		(5,273	)

⁽¹⁾	The Company booked restructuring expenses including payments, fees and transaction costs related to the changes in the Group’s structure.

⁽²⁾	These transactions did not generate cash flows. For the nine-month period ended September 30, 2026 and 2025, including 5,586 and 638 related to payments of contingencies, respectively.

Note 9. Financial income (expense), net

9.1 Interest income

Period from
January 1,
through
September 30,
2026

Period from
January 1,
through
September 30,
2025

Period from
July 1,
through
September 30,
2026

Period from
July 1,
through
September 30,
2025

Financial interest

11,502

8,933

3,321

7,603

Total interest income

11,502

8,933

3,321

7,603

9.2 Interest expense


	Period from January 1, through September 30, 2026			Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Borrowings interest (Note 16.2)		(183,372	)		(113,260	)		(63,992	)		(48,873	)

Total interest expense		(183,372	)		(113,260	)		(63,992	)		(48,873	)

9.3 Other financial income (expense)


	Period from January 1, through September 30, 2026			Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Amortized cost (Note 16.2)		(4,416	)		(7,826	)		(1,721	)		(1,143	)
Net changes in foreign exchange rate		(10,355	)		14,862			(67	)		(21,546	)
Discount of assets and liabilities at present value		(26,207	)		(13,819	)		(5,367	)		(10,471	)
Changes in the fair value of financial assets and liabilities		10,906			14,107			3,628			(1,942	)
Interest expense on lease liabilities (Note 13)		(2,432	)		(2,565	)		(724	)		(857	)
Discount for well plugging and abandonment		(2,642	)		(1,743	)		(760	)		(907	)
Other taxes interest ⁽¹⁾		(5,476	)		(53,127	)		(3,858	)		(14,440	)
Other ⁽²⁾		(29,166	)		(13,610	)		(7,039	)		(2,566	)

Total other financial income (expense)		(69,788	)		(63,721	)		(15,908	)		(53,872	)

⁽¹⁾	For the nine-month period ended September 30, 2026 and 2025, including a non-cash transaction of 1,652 and 32,052, respectively.

⁽²⁾	For the nine-month period ended September 30, 2026, and 2025, including a non-cash transaction of 7,066 and 6,175, respectively.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 10. Earnings per share

10.1

Basic

Basic earnings per share is calculated by dividing the Company’s profit by the weighted average number of ordinary shares outstanding during the period.


	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025		Period from July 1, through September 30, 2026		Period from July 1, through September 30, 2025
Profit for the period, net		722,905		633,368		293,457		315,286
Weighted average number of ordinary shares		108,175,337		101,903,171		110,931,263		104,896,801

Basic earnings per share		6.683		6.215		2.645		3.006

10.2

Diluted

Diluted earnings per share are calculated by dividing the Company’s profit by the weighted average number of ordinary shares outstanding during the period, plus the weighted average of dilutive potential ordinary shares.

Potential ordinary shares will be considered dilutive when their conversion to ordinary shares may reduce earnings per share or increase losses per share. They will be considered antidilutive when their conversion to ordinary shares may result in an increase in earnings per share or a reduction in loss per share.

The calculation of diluted earnings per share does not involve a conversion; the exercise or other issue of shares that may have an antidilutive effect on loss per share, or when the exercise price is higher than the average price of ordinary shares during the period, no dilution effect is booked, as diluted earnings per share is equal to basic earnings per share.


	Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025		Period from July 1, through September 30, 2026		Period from July 1, through September 30, 2025
Profit for the period, net		722,905		633,368		293,457		315,286
Weighted average number of ordinary shares ⁽¹⁾		113,748,455		105,990,422		116,641,605		108,404,281

Diluted earnings per share		6.355		5.976		2.516		2.908

⁽¹⁾	As of September 30, 2026, the Company has 110,617,404 outstanding shares that cannot exceed 112,301,755 shares. Likewise, in accordance with IFRS accounting standards the average number of ordinary shares with a potential dilutive effect amount to 113,748,455.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 11. Property, plant and equipment

The changes in property, plant and equipment for the nine-month period ended September 30, 2026 are as follows:


	Land and buildings			Vehicles, machinery, facilities, computer hardware and furniture and fixtures			Oil and gas properties			Production wells and facilities			Works in progress			Materials and spare parts			Total
Cost
Amounts as of December 31, 2025		8,342			58,912			1,080,000			5,628,605			596,810			136,198			7,508,867
Additions		—			178			2,874			—			1,228,726			102,467			1,334,245
Incorporation through Business Combination ⁽¹⁾		—			—			785,980			571,251			211,287			11,919			1,580,437
Transfers		1			25,133			—			1,075,991			(985,700	)		(115,425	)		—
Disposals		—			(126	)		—			(3,494	)⁽²⁾		—			—			(3,620	)

Amounts as of September 30, 2026		8,343			84,097			1,868,854			7,272,353			1,051,123			135,159			10,419,929

Accumulated depreciation
Amounts as of December 31, 2025		(232	)		(28,198	)		(171,219	)		(1,766,186	)		—			—			(1,965,835	)
Depreciation		—			(7,370	)		(98,309	)		(675,402	)		—			—			(781,081	)
Disposals		—			126			—			—			—			—			126

Amounts as of September 30, 2026		(232	)		(35,442	)		(269,528	)		(2,441,588	)		—			—			(2,746,790	)

Net value

Amounts as of September 30, 2026		8,111			48,655			1,599,326			4,830,765			1,051,123			135,159			7,673,139

Amounts as of December 31, 2025		8,110			30,714			908,781			3,862,419			596,810			136,198			5,543,032

⁽¹⁾	See Note 1.2.1 and 29.2.

⁽²⁾	Related to the re-estimation of well plugging and abandonment. This transaction did not generate cash flows.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 12. Goodwill and other intangible assets

Below are the changes in goodwill and other intangible assets for the nine-month period ended September 30, 2026:


	Goodwill		Other intangible assets
Cost
Amounts as of December 31, 2025		22,576		47,079
Additions		—		4,531

Amounts as of September 30, 2026		22,576		51,610

Accumulated amortization
Amounts as of December 31, 2025		—		(28,594	)
Amortization		—		(8,327	)

Amounts as of September 30, 2026		—		(36,921	)

Net value

Amounts as of September 30, 2026		22,576		14,689

Amounts as of December 31, 2025		22,576		18,485

Note 13. Right-of-use assets and lease liabilities

The carrying amount of the Company’s right-of-use assets and lease liabilities, as well as the changes for the nine-month period ended September 30, 2026, are detailed below:


	Right-of-use assets									Total lease liabilities
	Land and Buildings			Facilities and machinery			Total			Total lease liabilities
Amounts as of December 31, 2025		16,042			137,241			153,283			(143,903	)
Additions, net		1,263			(13,389	)		(12,126	)		12,208
Depreciation ⁽¹⁾		(775	)		(37,768	)		(38,543	)		—
Payments		—			—			—			56,628
Interest expense ⁽²⁾		—			—			—			(8,030	)

Amounts as of September 30, 2026		16,530			86,084			102,614			(83,097	)

⁽¹⁾	Including the depreciation of drilling services capitalized as “Works in progress” for 31,842.

⁽²⁾	Including drilling agreements capitalized as “Works in progress” for 5,598.

Short-term and low-value lease agreements were recognized under “General and administrative expenses” in the statements of profit or loss and other comprehensive income for 246 and 98 for the nine-month periods ended September 30, 2026 and 2025, respectively.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 14. Income tax

The most significant components of the income tax expense in the statements of profit or loss and other comprehensive income of these unaudited interim condensed consolidated financial statements are as follows:


	Period from January 1, through September 30, 2026			Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Income tax
Current income tax (expense)		(493,169	)		(149,727	)		(251,785	)		(3,119	)
Deferred income tax benefit (expense)		118,104			(83,182	)		32,474			(119,099	)

Income tax (expense) charged to statement of profit or loss		(375,065	)		(232,909	)		(219,311	)		(122,218	)

Deferred income tax charged to other comprehensive income		1,569			665			17			16

Total income tax (expense)		(373,496	)		(232,244	)		(219,294	)		(122,202	)

For the nine-month periods ended September 30, 2026 and 2025, the Company’s effective rate was 34% and 27%, respectively.

The differences between the effective and statutory rate mainly include: (i) the application of the tax adjustment for inflation in Argentina; (ii) fluctuations in Argentine peso (“ARS”) with respect to the USD affecting the Company’s tax deductions of nonmonetary assets; (iii) the accumulative tax losses not recognized in the period; and (iv) the gain from Business Combination (Note 8.1).

See Note 30 to the annual consolidated financial statements as of December 31, 2025.

Note 15. Trade and other receivables


	As of September 30, 2026		As of December 31, 2025
Noncurrent
Other receivables:
Prepayments, tax receivables and other:
Advance payments for transportation services (Note 27)		392,831		311,087
Receivables related to the transfer of conventional assets ⁽¹⁾		25,023		40,945
Prepaid expenses and other receivables		19,366		19,409
Turnover tax		2,579		670
Income tax		785		785

		440,584		372,896

Financial assets:
Accounts receivable from third parties⁽²⁾		41,945		—
Loans to employees		249		130

		42,194		130

Total noncurrent trade and other receivables		482,778		373,026

Current
Trade:
Oil and gas accounts receivable (net of allowance for expected credit losses)		290,038		186,403

		290,038		186,403

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)


	As of September 30, 2026		As of December 31, 2025
Other receivables:
Prepayments, tax credits and other:
Value added tax		92,464		77,160
Advance payments for transportation services (Note 27)		30,630		26,098
Receivables related to the transfer of conventional assets ⁽¹⁾		19,288		23,984
Income tax		11,101		9,283
Prepaid expenses and other receivables		6,753		7,253
Turnover tax		2,835		3,047

		163,071		146,825

Financial assets:
Accounts receivable from third parties^{(2) (3)}		52,809		9,404
Receivables from joint operations		9,624		1,368
Gas IV Plan		4,497		2,316
Advances to directors and loans to employees		1,204		—
Other		1,521		1,365

		69,655		14,453

Other receivables		232,726		161,278

Total current trade and other receivables		522,764		347,681

⁽¹⁾

Related to the agreement signed with Tango Energy, connected with the transfer of conventional assets. For the nine-month periods ended September 30, 2026 and 2025, the Company recognized 10,725 and 24,018, respectively, mainly related to the amortization of the account receivable, in the statement of profit or loss under “Other non-cash costs related to the transfer of conventional assets”. Additionally, for the nine-month period ended September 30, 2025 the Company received 5,734, related to the transaction (See Note 3.2.8 to the annual consolidated financial statements as of December 31, 2025).

⁽²⁾	As of September 30, 2026, 41,945 and 22,019 noncurrent and current receivables from third parties, respectively, related to the contingent consideration arising from the BSP and Bajo del Toro Sale (Note 1.2.1).

⁽³⁾	Includes 11,763related to the assignment described in Note 1.2.3.

Due to the short-term nature of current trade and other receivables, it carrying amount is considered similar to its fair value. The fair values of noncurrent trade and other receivables do not differ significantly from it carrying amounts either.

As of September 30, 2026, in general, accounts receivable has a 19-day term for sales of crude oil and a 45-day term for sales of natural gas and LPG.

The Company sets up a provision for trade receivables when there is information showing that the debtor is facing severe financial difficulties and that there is no realistic probability of recovery, for example, when the debtor goes into liquidation or files for bankruptcy proceedings. Trade receivables that are derecognized are not subject to compliance activities. The Company recognized an allowance for expected credit losses against all trade receivables that are 90 days past due because based on its history these receivables are generally not recovered.

As of September 30, 2026, and December 31, 2025, the provision for expected credit losses was recorded for 68 and 70 respectively.

As of the date of these unaudited interim condensed consolidated financial statements, maximum exposure to credit risk is related to the carrying amount of each class of accounts receivable.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 16. Financial assets and liabilities

16.1 Borrowings


	As of September 30, 2026		As of December 31, 2025
Noncurrent
Corporate bond (“ON”)		2,630,520		2,257,997
Financial loans		367,997		446,730
Exports pre-financing		79,521		99,255

Total noncurrent		3,078,038		2,803,982

Current
ON		230,390		182,347
Financial loans		131,321		72,738
Exports pre-financing		202,506		95,010

Total current		564,217		350,095

Total Borrowings		3,642,255		3,154,077

Below are the maturity dates of Company borrowings (excluding lease liabilities) and their exposure to interest rates:


	As of September 30, 2026		As of December 31, 2025
Fixed interest
Less than 1 year		482,744		322,766
From 1 to 2 years		198,493		348,369
From 2 to 5 years		515,282		392,044
Over 5 years		2,046,149		1,666,879

Total		3,242,668		2,730,058

Variable interest
Less than 1 year		81,473		27,329
From 1 to 2 years		105,657		105,677
From 2 to 5 years		212,457		291,013
Over 5 years		—		—

Total		399,587		424,019

Total Borrowings		3,642,255		3,154,077

See Note 16.4 for information on the fair value of the borrowings.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Vista Argentina issued ON, under the name “Programa de Notas” approved by CNV. The following chart shows the details and carrying amount of ON as of September 30, 2026 and December 31, 2025:


Instrument	Execution date	Currency	Principal		Interest	Annual rate		Maturity date	As of September 30, 2026		As of December 31, 2025
ON XII	August, 2021	USD-linked ⁽¹⁾		100,769	Fixed		5.85%	August, 2031		75,869		87,233
ON XVI	December, 2022	USD-linked ⁽¹⁾		104,236	Fixed		0.00%	June, 2026		—		104,151
ON XVII	December, 2022	USD-linked ⁽¹⁾		39,118	Fixed		0.00%	December, 2026		39,107		39,064
ON XVIII	March, 2023	USD-linked ⁽¹⁾		118,542	Fixed		0.00%	March, 2027		118,467		118,319
ON XIX	March, 2023	USD-linked ⁽¹⁾		16,458	Fixed		1.00%	March, 2028		16,445		16,432
ON XXI	August, 2023	USD-linked ⁽¹⁾		70,000	Fixed		0.99%	August, 2028		69,955		69,899
ON XXII	December, 2023	USD		14,669	Fixed		5.00%	June, 2026		—		14,726
ON XXIII	March, 2024	USD		92,203	Fixed		6.50%	March, 2027		—		73,463	⁽²⁾
ON XXIV	May, 2024	USD		46,562	Fixed		8.00%	May, 2029		47,942		46,942
ON XXV	July, 2024	USD-linked ⁽¹⁾		53,195	Fixed		3.00%	July, 2028		53,335		53,239
ON XXVI	October, 2024	USD		150,000	Fixed		7.65%	October, 2031		154,738		151,747
ON XXVII	December, 2024	USD		600,000	Fixed		7.63%	December, 2035		609,697		597,954
ON XXVIII	March, 2025	USD		92,414	Fixed		7.50%	March, 2030		92,461		94,038
ON XXIX	June, 2025	USD		900,000	Fixed		8.50%	June, 2033		918,130		899,341
ON XXX	October, 2025	USD		73,256	Fixed		6.00%	April, 2027		—		73,796
ON XXXI	April, 2026	USD		500,000	Fixed		7.88%	April, 2038		514,126		—
ON XXXII	July, 2026	USD		75,000	Fixed		3.75%	January, 2028		75,244		—
ON XXXIII	July, 2026	USD		75,000	Fixed		5.00%	July, 2029		75,394		—

								Total ON		2,860,910		2,440,344

⁽¹⁾	Subscribed in USD, payable in ARS at the exchange rate applicable on maturity date.

⁽²⁾	As of December 31, 2025, the carrying amount of ON XXIII include 20,000 ON repurchased by the Company.

Certain borrowings includes the Company’s obligation to comply with certain financial ratios and debt service coverage requirements (the “covenants”). Non-compliance with these covenants could restrict the ability of the Company and its subsidiaries to, among other things, pay dividends, provide guarantees, incur additional indebtedness, or dispose of material assets, among others.

As of September 30, 2026, the Company was in compliance with all financial covenants and other commitments associated with such borrowings.

On March 20, 2026, Vista Argentina increased the amount of the Programa de Notas, approved by CNV for a total principal up to 4,000,000 or its equivalent in other currencies.

See Note 30 for information on subsequent events.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

16.2 Changes in liabilities from financing activities

Changes in the borrowings were as follows:


	As of September 30, 2026			As of December 31, 2025
Amounts at beginning of period		3,154,077			1,448,567
Proceeds from borrowings		1,847,217			2,838,173
Proceeds from borrowings of Business Combination		—			50,505
Payment of borrowings principal		(1,401,657	)		(1,173,623	)
Payment of borrowings interest		(138,349	)		(148,310	)
Payment of borrowings cost		(6,736	)		(17,935	)
Borrowings interest ⁽¹⁾ (Note 9.2)		183,372			163,356
Amortized cost ⁽¹⁾ (Note 9.3)		4,416			7,880
Changes in foreign exchange rate ⁽¹⁾		(85	)		(14,536	)

Amounts at end of period		3,642,255			3,154,077

⁽¹⁾	These transactions did not generate cash flows.

16.3 Financial instruments by category

The following chart includes the financial instruments broken down by category:


As of September 30, 2026	Financial assets / liabilities at amortized cost		Financial assets / liabilities at fair value		Total financial assets / liabilities
Assets
Trade and other receivables (Note 15)		249		41,945		42,194
Plan assets (Note 25)		—		1,011		1,011

Total noncurrent financial assets		249		42,956		43,205

Short-term investments (Note 19)		368,184		188,997		557,181
Trade and other receivables (Note 15)		337,674		22,019		359,693

Total current financial assets		705,858		211,016		916,874

Liabilities
Borrowings (Note 16.1)		3,078,038		—		3,078,038
Trade and other payables (Note 24)		295,018		203,911		498,929
Lease liabilities (Note 13)		49,188		—		49,188

Total noncurrent financial liabilities		3,422,244		203,911		3,626,155

Borrowings (Note 16.1)		564,217		—		564,217
Trade and other payables (Note 24)		599,486		121,868		721,354
Lease liabilities (Note 13)		33,909		—		33,909

Total current financial liabilities		1,197,612		121,868		1,319,480


As of December 31, 2025	Financial assets / liabilities at amortized cost		Financial assets / liabilities at fair value		Total financial assets / liabilities
Assets
Plan assets (Note 25)		—		1,865		1,865
Trade and other receivables (Note 15)		130		—		130

Total noncurrent financial assets		130		1,865		1,995

Short-term investments (Note 19)		90,414		109,433		199,847
Trade and other receivables (Note 15)		200,856		—		200,856

Total current financial assets		291,270		109,433		400,703

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)


As of December 31, 2025	Financial assets / liabilities at amortized cost		Financial assets / liabilities at fair value		Total financial assets / liabilities
Liabilities
Borrowings (Note 16.1)		2,803,982		—		2,803,982
Trade and other payables (Note 24)		292,236		—		292,236
Lease liabilities (Note 13)		88,451		—		88,451

Total noncurrent financial liabilities		3,184,669		—		3,184,669

Borrowings (Note 16.1)		350,095		—		350,095
Trade and other payables (Note 24)		419,130		—		419,130
Lease liabilities (Note 13)		55,452		—		55,452

Total current financial liabilities		824,677		—		824,677

Below are income, expenses, profit, or loss from each category of financial instrument:

For the nine-month period ended September 30, 2026:


	Financial assets/liabilities at amortized cost			Financial assets/liabilities at fair value		Total financial assets / liabilities
Interest income (Note 9.1)		11,502			—		11,502
Interest expense (Note 9.2)		(183,372	)		—		(183,372	)
Amortized cost (Note 9.3)		(4,416	)		—		(4,416	)
Net changes in foreign exchange rate (Note 9.3)		(10,355	)		—		(10,355	)
Discount of assets and liabilities at present value (Note 9.3)		(26,207	)		—		(26,207	)
Changes in the fair value of financial assets and liabilities (Note 9.3)		—			10,906		10,906
Interest expense on lease liabilities (Note 9.3)		(2,432	)		—		(2,432	)
Discount for well plugging and abandonment (Note 9.3)		(2,642	)		—		(2,642	)
Other taxes interest (Note 9.3)		(5,476	)		—		(5,476	)
Other (Note 9.3)		(29,166	)		—		(29,166	)

Total		(252,564	)		10,906		(241,658	)

For the nine-month period ended September 30, 2025:


	Financial assets/liabilities at amortized cost			Financial assets/liabilities at fair value		Total financial assets / liabilities
Interest income (Note 9.1)		8,933			—		8,933
Interest expense (Note 9.2)		(113,260	)		—		(113,260	)
Amortized cost (Note 9.3)		(7,826	)		—		(7,826	)
Net changes in foreign exchange rate (Note 9.3)		14,862			—		14,862
Discount of assets and liabilities at present value (Note 9.3)		(13,819	)		—		(13,819	)
Changes in the fair value of financial assets and liabilities (Note 9.3)		—			14,107		14,107
Interest expense on lease liabilities (Note 9.3)		(2,565	)		—		(2,565	)
Discount for well plugging and abandonment (Note 9.3)		(1,743	)		—		(1,743	)
Other taxes interest (Note 9.3)		(53,127	)		—		(53,127	)
Other (Note 9.3)		(13,610	)		—		(13,610	)

Total		(182,155	)		14,107		(168,048	)

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

16.4 Fair value

This note includes information on the Company’s method for assessing the fair value of its financial assets and liabilities.

16.4.1 Fair value of the Company’s financial assets and liabilities measured at fair value on a recurring basis

The Company classifies the measurements at fair value of financial instruments using a fair value hierarchy, which shows the relevance of the variables applied to carry out these measurements. The fair value hierarchy has the following levels:

- Level 1: quoted (unadjusted) prices in active markets for identical assets or liabilities.

- Level 2: data other than the quoted prices included in Level 1 that are observable for assets or liabilities, either directly (that is prices) or indirectly (that is derived from prices).

- Level 3: data on the asset or liability that are based on information that cannot be observed in the market (that is, non-observable data).

The following chart shows the Company’s financial assets measured at fair value as of September 30, 2026 and December 31, 2025:


As of September 30, 2026	Level 1		Level 2		Level 3		Total
Assets
Financial assets at fair value through profit or loss
Plan assets		1,011		—		—		1,011
Short-term investments		188,997		—		—		188,997
Trade and other receivables		—		—		63,964		63,964

Total assets		190,008		—		63,964		253,972

Liabilities
Financial liabilities at fair value through profit or loss
Trade and other payables		—		—		325,779		325,779

Total liabilities		—		—		325,779		325,779


As of December 31, 2025	Level 1		Level 2		Level 3		Total
Assets
Financial assets at fair value through profit or loss
Plan assets		1,865		—		—		1,865
Short-term investments		109,433		—		—		109,433

Total assets		111,298		—		—		111,298

The value of financial instruments traded in active markets is based on quoted market prices as of the date of these accompanying unaudited interim condensed consolidated financial statements. A market is considered active when quoted prices are available regularly through a stock exchange, a broker, a specific sector entity or regulatory agency, and these prices reflect regular and current market transactions between parties at arm’s length. The quoted market price used for financial assets held by the Company is the current offer price. These instruments are included in Level 1.

For financial instruments not traded in an active market, the fair value is determined using appropriate valuation techniques. These valuation techniques maximize the use of observable market data, when available, and minimize the use of Company’s specific estimates. Should all significant variables used to establish the fair value of a financial instrument be observable, the instrument is included in Level 2.

Should one or more variables used in determining the fair value not be observable in the market, the financial instrument is included in Level 3.

There were no transfers between Level 1, Level 2 and Level 3 from December 31, 2025, through September 30, 2026.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

16.4.2 Fair value of financial assets and liabilities that are not measured at fair value (but require fair value disclosures)

Except for the information included in the following chart, the Company considers that the carrying amounts of financial assets and liabilities recognized in the unaudited interim condensed consolidated financial statements approximate to its fair values, as explained in the related notes.

As of September 30, 2026

Carrying
amount

Fair value

Level

Liabilities

Borrowings

3,642,255

3,677,937

Total liabilities

3,642,255

3,677,937

16.5 Risk management objectives and policies concerning financial instruments

16.5.1 Financial risk factors

The Company’s activities are exposed to several financial risks: market risk (including exchange rate risk, interest rate risk and price risk), credit risk and liquidity risk.

Financial risk management is included in the Company’s global policies, and it adopts a comprehensive risk management policy focused on tracking risks affecting the entire Company. This strategy aims at striking a balance between profitability targets and risk exposure levels. Financial risks are derived from the financial instruments to which the Company is exposed during each period or as of every period-end.

The Company’s financial department, controls financial risk by identifying, assessing and covering financial risks. The risk management systems and policies are reviewed regularly to show the changes in market conditions and the Company’s activities.

The Company reviewed its exposure to financial risk factors and identified no significant changes in the risk analysis included in its annual consolidated financial statements as of December 31, 2025, except for the following:

16.5.1.1 Market risk

Exchange rate risk

The Company’s financial position and results of operations are sensitive to exchange rate changes between USD and ARS. As of December 31, 2025, the Company performed foreign exchange currency transactions, and the impact in the results of the period is recognized in the consolidated statement of profit or loss in “Other financial income (expense)”.

Most Company revenues are denominated in USD, or the changes in sales follow the changes in USD listed price.

During the nine-month period ended September 30, 2026, and for the year ended December 31, 2025, ARS depreciated by about 4% and 41%, respectively.

The following chart shows the sensitivity to a modification in the exchange rate of ARS to USD while maintaining the remainder variables constant. Impact on profit before taxes is related to changes in the fair value of monetary assets and liabilities denominated in currencies other than the USD, the Company’s functional currency. The Company’s exposure to changes in foreign exchange rates for the remainder currencies is immaterial.


	As of September 30, 2026	As of December 31, 2025
Changes in exchange rate:	+/- 10%	+/- 10%
Effect on profit or loss before income taxes	10,904 / (10,904)	8,169 / (8,169)
Effect on equity before income taxes	10,904 / (10,904)	8,169 / (8,169)

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Interest rate risk

The purpose of interest rate risk management is to minimize finance costs and limit the Company’s exposure to interest rate increases.

Variable-rate indebtedness exposes the Company’s cash flows to interest rate risk due to potential volatility. Fixed-rate indebtedness exposes the Company to interest rate risk on the fair value of its liabilities as they could be considerably higher than variable rates. As of September 30, 2026 and December 31, 2025, about 11% and 13% of indebtedness was subject to variable interest rates, respectively.

For the nine-month period ended September 30, 2025, the average interest rate for borrowings in ARS was 38.08%.

For the nine-month periods ended September 30, 2026, and 2025, the variable interest rate of borrowings denominated in USD stood at 6.61% and 7.98%, respectively.

The Company expects to lessen its interest rate exposure by analyzing and assessing (i) the different sources of liquidity available in domestic and international financial and capital markets (if available); (ii) alternative (fixed or variable) interest rates, currencies and contractual terms available for companies in a sector, industry and risk similar to the Company’s; and (iii) the availability, access and cost of interest rate hedge contracts. Hence, the Company assesses the impact on profit or loss of each strategy on the obligations that represent the main positions to the main interest-bearing positions.

The Company considers that the risk of an increase in interest rates is low; therefore, it does not expect substantial debt risk.

For the nine-month period ended September 30, 2026, and for the year ended December 31, 2025, the Company did not use derivative financial instruments to mitigate interest rate risks.

Note 17. Investments in associates

As of September 30, 2026, and December 31, 2025, the Company holds the following interests in associates:


	Equity interest						Income (loss) from investments in associates					Investments in associates
Company	As of September 30, 2026			As of December 31, 2025			Period from January 1, through September 30, 2026		Period from January 1, through September 30, 2025			As of September 30, 2026		As of December 31, 2025		Main activity
VMOS S.A.		9.09	%		10.20	%		3,471		(3,746	)		61,806		30,702		Midstream
Other		—			—			—		—			27,149		23,840		—

Total investments in associates								3,471		(3,746	)		88,955		54,542

For the nine-month period ended September 30, 2026 and 2025, the Company made payments related to investment in associates for 30,942 and 42,508, respectively.

Note 18. Inventories


	As of September 30, 2026		As of December 31, 2025
Crude oil stock (Note 5.2)		18,311		6,881
Materials and spare parts		3,202		2,575
Assigned crude oil stock		—		1

Total inventories		21,513		9,457

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 19. Cash, bank balances and other short-term investments


	As of September 30, 2026		As of December 31, 2025
Money market funds		245,374		90,414
Cash in banks		227,863		333,002
Mutual funds		183,594		102,768
Time deposits		122,002		—
Argentine government bonds		5,403		6,665
Other investments		808		5,553

Total cash, banks balances and other short-term investments		785,044		538,402

Cash and cash equivalents include cash on hand and at bank and investments maturing within 3 months. For the consolidated statement of cash flows purposes below is the reconciliation between cash, bank and short-term investments and cash and cash equivalents:


	As of September 30, 2026			As of December 31, 2025
Cash, bank balances and other short-term investments		785,044			538,402
Less
Argentine government bonds		(5,403	)		(6,665	)
Other investments		(808	)		(5,553	)

Cash and cash equivalents		778,833			526,184

Note 20. Equity

20.1 Capital stock

As of September 30, 2026, and December 31, 2025, the Company’s variable capital stock amounted to 760,781 and 491,165, represented by 110,617,404 and 104,299,705, respectively, of which: (i) 110,617,402 and 104,299,703 respectively, are fully subscribed and paid Series A shares with no face value, each entitled to one vote; and (ii) 2 are Series C shares for both periods.

As part of the transaction mentioned in Note 29, on May 7, 2026 and April 11, 2025 the Board of Directors approved an increase in the variable portion of the Company’s capital stock by 325,000 (through the issuance of 6,223,220 Series A shares) and 299,687 (through the issuance of 7,297,507 Serie A shares) respectively.

During the nine-month period ended September 30, 2026 and 2025 the Company repurchased 825,000 and 1,213,371 Serie A share for a total amount of 55,385 and 50,000, respectively. As of the date of issuance of these interim condensed consolidated financial statements, the shares repurchased during the nine-month period ended September 30, 2026, are held in Treasury.

During the nine-month period ended September 30, 2026 and 2025, 919,479 and 2,886,823 Series A shares were issued as part of the LTIP granted to Company employees, respectively.

As of September 30, 2026, and December 31, 2025, the Company’s authorized capital includes 18,174,837 and 24,492,536 Series A ordinary shares, respectively, held in Treasury.

20.2. Legal reserve and share repurchase reserve

(i) Legal reserve:

As of September 30, 2026, and December 31, 2025, the legal reserve amounts to 10,560 and 8,233, respectively.

On April 28, 2026, through an Ordinary General Shareholders’ Meeting, the Company’s shareholders approved an increase in the legal reserve for a total amount of 2,327, based on the Company’s unconsolidated financial statements.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

(ii) Share repurchase reserve:

As of September 30, 2026, and December 31, 2025, the total amount of the share repurchase reserve amount to 329,324 and 179,324, respectively.

On April 28, 2026, and April 9, 2025, through an Ordinary General Shareholders’ Meeting, the Company’s shareholders approved an increase in the share repurchase reserve of treasury shares for a total amount of 150,000 and 50,000, respectively, based on the Company’s unconsolidated financial statements.

20.3. Other equity accounts

As of September 30, 2026, Other equity accounts include: (i) an increase of 84,488 resulting from the adjustment to reflect the fair value of the shares issued as consideration for the BSP and Bajo del Toro Acquisition at the acquisition date; and (ii) a decrease of 11,579 resulting from the difference between amount by which the non-controlling interest was stated and the fair value of the consideration received, which amounted to 167,160.

For further information see Note 21 to the annual consolidated financial statements as of December 31, 2025.

Note 21. Provisions


	As of September 30, 2026		As of December 31, 2025
Noncurrent
Well plugging and abandonment		53,466		51,279
Environmental remediation		237		234

Total noncurrent provisions		53,703		51,513

Current
Well plugging and abandonment		1,544		3,178
Contingencies		433		5,244
Environmental remediation		57		2,378

Total current provisions		2,034		10,800

Note 22. Salaries and payroll taxes


	As of September 30, 2026		As of December 31, 2025
Current
Provision for bonuses and incentives		22,515		25,658
Salaries and social security contributions		7,376		10,233

Total current salaries and payroll taxes		29,891		35,891

Note 23. Other taxes and royalties


	As of September 30, 2026		As of December 31, 2025
Current
Royalties and others		63,101		28,662
Personal assets tax		11,345		11,122
Tax withholdings		5,331		2,936
Other		4,318		1,225

Total current other taxes and royalties		84,095		43,945

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 24. Trade and other payables


	As of September 30, 2026		As of December 31, 2025
Noncurrent
Payables to third parties ^{(1) (2) (3)}		498,929		292,236

Total other noncurrent accounts payables		498,929		292,236

Total noncurrent accounts payables		498,929		292,236

Current
Accounts payables:
Suppliers		573,836		399,373

Total current accounts payables		573,836		399,373

Other accounts payables:
Payables to third parties ^{(2) (3)}		146,909		19,236
Extraordinary fee for Gas IV Plan		609		425
Payables to partners of joint operations		—		96

Total other current accounts payables		147,518		19,757

Total current trade and other payables		721,354		419,130

⁽¹⁾	As of September 30, 2026 and December 31, 2025, mainly includes 242,191 and 222,749, respectively, in connection with the liability assumed for the acquisition of Vista Lach (See Note 1.2.2 and 29 to the annual consolidated financial statements as of December 31, 2025).

⁽²⁾

As of September 30, 2026, includes 52,661 and 25,041 noncurrent and current payables to third parties, respectively, related to the Farmout Agreement. Likewise, as of December 31, 2025, includes 68,298 and 19,236 noncurrent and current payables to third parties, respectively, related to the Farmout Agreement (See Note 1.2.1 to the annual consolidated financial statements as of December 31, 2025).

⁽³⁾

As of September 30, 2026, includes 203,911 and 121,868 noncurrent and current payables to third parties, respectively, related to the contingent consideration arising from the BSP and Bajo del Toro Acquisition (See Note 1.2.1). For the nine-month periods ended September 30, 2026, the Company recognized 16,168 related to the fair value remeasurement of the contingent consideration liability, in the statement of profit or loss under “Remeasurement of contingent consideration”

Other than mentioned above, due to the short-term nature of current trade and other payables, their carrying amount is deemed to be the same as its fair value. The carrying amount of noncurrent trade and other payable does not differ considerably from its fair value.

Note 25. Employee benefits

The following chart summarizes net expense components and the changes in the liability for long-term employee benefits in the unaudited interim condensed consolidated financial statements:


	Period from January 1, through September 30, 2026			Period from January 1, through September 30, 2025			Period from July 1, through September 30, 2026			Period from July 1, through September 30, 2025
Cost of interest		(682	)		(588	)		(274	)		(196	)
Cost of services		—			(4	)		—			—

Total		(682	)		(592	)		(274	)		(196	)


	As of September 30, 2026
	Present value of the obligation			Plan assets			Net liabilities
Amounts at beginning of period		(19,519	)		3,293			(16,226	)
Items classified as loss or profit
Cost of interest		(766	)		84			(682	)
Items classified in other comprehensive income
Actuarial remeasurement		(4,359	)		(120	)		(4,479	)
Payment of contributions		1,432			(1,062	)		370

Amounts at end of period		(23,212	)		2,195			(21,017	)

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

The fair value of plan assets as of every period is as follows:


	As of September 30, 2026		As of December 31, 2025
Cash and cash equivalents		1,184		1,428
US government bonds		1,011		1,865

Total		2,195		3,293

See Note 23 to the annual consolidated financial statements as of December 31, 2025.

Note 26. Related parties’ transactions and balances

There were no significant changes in related parties and relevant transactions during the nine-month period ended September 30, 2026 (See Note 27 to the annual consolidated financial statements as of December 31, 2025).

Note 27. Commitments and contingencies

27.1 Commitments

27.1.1 Transport services commitments

The Company, through its subsidiaries Vista Argentina, Vista Lach and BSP, entered into transportation services commitments under the following projects: (i) the Duplicar Plus Project implemented by Oleoductos del Valle S.A. (“Duplicar”); (ii) the project to expand the Puerto Rosales maritime terminal and pumping station implemented by Oiltanking Ebytem S.A. (“Oiltanking Project”); (iii) the Transportation Service Agreement for Vaca Muerta Centro Pipeline (“VMOC” by Spanish acronym); and (iv) the Transportation Service Agreement for Vaca Muerta Norte Pipeline (“VMON” by Spanish acronym).

El Portón gas transportation agreement (the “El Portón agreement”)

As part of the BSP and Bajo del Toro Acquisition described in Note 1.2.1, Vista Argentina assumed a natural gas transportation agreement with YPF S.A. related to the Bajo del Toro area. Under the agreement, Vista Argentina was awarded a firm transportation capacity of up to 1.0 MMm³/day.

As of September 30, 2026 advance payments for transportation services amounted to 423,461 as follows: (i) 223,565 related to Duplicar; (ii) 61,471 related to the Oiltanking Project; (iii) 64,581 related to VMOC; (iv) 29,344 related to VMON; and (v) 44,500 related to the El Portón agreement.

As of December 31, 2025 advance payments for transportation services amounted to 337,185 as follows: (i) 206,358 related to the Duplicar; (ii) 53,266 related to Oiltanking Project; (iii) 45,301 related to VMOC; and (iv) 32,260 related to VMON.

See Notes 28.1 to the annual consolidated financial statements as of December 31, 2025 for more information about the commitments.

27.2 Contingencies

(i) Asociación de Superficiarios de la Patagonia (“ASSUPA” by its Spanish acronym)

On July 1, 2004, Vista Argentina was served with notice of a lawsuit filed by ASSUPA against various concession-holding companies operating in the Neuquén Basin. The claim sought, among other remedies, the remediation of an alleged collective environmental damage and the establishment of an environmental restoration fund.

On May 21, 2026, the Supreme Court of Justice of Argentina issued a final judgment in the case, dismissing the claim on the grounds that the plaintiff failed to demonstrate that the reported activities had effectively caused degradation or contamination of environmental resources.

Except for the aforementioned, there were no significant changes in commitments and contingencies for the nine-month period ended September 30, 2026 (See Notes 28 to the annual consolidated financial statements as of December 31, 2025).

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 28. Tax regulations

There were no significant changes in Argentina’s and Mexico’s tax regulations during the nine-month period ended September 30, 2026 (See Note 30 to the annual consolidated financial statements as of December 31, 2025).

Note 29. Business Combination

29.1. Vista Lach Acquisition

On April 15, 2025, the Company acquired 100% of Vista Lach’s capital stock (“Vista Lach Acquisition”), which was accounted for as a business combination using the acquisition method, effective from the date when the Company obtained control of the acquiree.

Under the terms of the Vista Lach Acquisition, the total consideration amounted to 1,406,441 according to the following breakdown: (i) 899,687 paid in cash; (ii) 299,687 paid by transferring 7,297,507 ADSs, and (iii) a liability assumed for a nominal value of 300,000 payable in cash, with 50% due on April 15, 2029, and the remaining 50% on April 15, 2030, without accruing interest. As of the date of the Vista Lach Acquisition, the present value of the liabilities assumed amounted to 207,067.

Due to the difference between the consideration paid and the net identifiable assets, for the nine-month period ended September 30, 2025 the Company recognized a gain of 490,530, booked in “Gain from Business Combination” within “Other operating income” (Note 8.1).

See Note 1.2.2 and 32 of the annual consolidated financial statements as of December 31, 2025.

29.2. BSP and Bajo del Toro Acquisition

As mentioned in Note 1.2.1, on February 2, 2026, the Company signed several agreements which were booked as a business combination using the acquisition method, effective from May 7, 2026, which was the date when the Company obtained control of the acquiree.

Under the terms of the BSP and Bajo del Toro Acquisition, the total consideration amounted to 1,439,606, broken down as follows: (i) 722,197 paid in cash; (ii) 409,488 paid through the transfer of 6,223,220 ADSs, and (iii) contingent consideration liability assumed amounting to 307,921, payable annually over a five-year period and calculated based on future Brent crude oil prices and the production attributable to the acquired interests

The fair value of identifiable assets and liabilities as of the acquisition date was preliminarily determined in accordance with IFRS 3 as follow:


	As of April 30, 2026
Property, plant and equipment		1,580,437
Trade and other receivables		198,239
Inventories		2,054
Assets held for sale		107,767
Cash, bank balances and other short-term investments		55,793

Total assets acquired		1,944,290

Provisions		6,518
Deferred income tax liabilities		272,613
Income tax liability		96,753
Other taxes and royalties		13,457
Trade and other payables		106,590
Liabilities directly associated with assets held for sale		8,753

Total liabilities assumed		504,684

Total net assets measured at fair value		1,439,606

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)


	As of April 30, 2026
Cash consideration		722,197
Cash and cash equivalent acquired		(55,793	)

Payment for Business Combination, net of cash acquired		666,404

The Company considered the identifiable assets and liabilities as of April 30, 2026. There would have been no material differences had the purchase price been allocated as from May 7, 2026.

This purchase price allocation is preliminary, as the assessment of the current value is underway.

As from the acquisition date, BSP and Bajo del Toro contributed revenue of 355,829 and profit before income tax of 223,904 to the Company. Had the business combination occurred as from January 1, 2026, the Company’s revenue from continuing operations would have amounted to 3,606,001 and its profit before income tax from continuing operations would have amounted to 1,213,036.

Note 30. Subsequent events

The Company assessed events subsequent to September 30, 2026, to determine the need for potential recognition or disclosure in these unaudited interim condensed consolidated financial statements. The Company assessed such events through October 28, 2026, date in which these financial statements were made available for issue:

- On October 1, 2026, Vista Argentina signed a loan agreement with Banco de la Nacion Argentina, for an amount of 30,000, at an annual interest rate of 1.75% and an expiration date in November 2026.

- On October 9, 2026, Vista Argentina issued an additional ON XXXI for an amount of 400,000, at an annual interest rate of 7.95% and an expiration date in April 2038.

- On October 13, 2026, Vista Argentina signed a loan agreement with Banco de la Nacion Argentina, for an amount of 50,000, at an annual interest rate of 1.75% and an expiration date in December 2026.

- On October 26, 2026, Vista Argentina signed a loan agreement with Banco de la Nacion Argentina, for an amount of 30,000, at an annual interest rate of 1.75% and an expiration date in December 2026.

- During October 2026, Vista Argentina paid principal and interest for a total amount of 32,635, corresponding to exports pre-financing.

- During October 2026, Vista Argentina paid interest for an amount of 25,843, corresponding to ON.

- During October 2026, Vista Argentina paid interest for an amount of 8,705, corresponding to financial loans.

- During October 2026, Vista Lach paid principal and interest for a total amount of 30,127, corresponding to exports pre-financing.

There are no other events or transactions between the closing date and the date of issuance of these unaudited interim condensed consolidated financial statements that could significantly affect the Company’s financial position or profit or loss.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

Note 31. Supplementary pro forma financial information (unaudited)

As mentioned in Note 1.2.1, the Company, through its subsidiary Vista Argentina signed several agreements including the following transactions: (i) the acquisition of 100% of Equinor’s capital stock, which holds a 30% interest in the Bandurria Sur block; and the acquisition of a 50% interest in the Bajo del Toro block from Equinor Argentina B.V. Sucursal Argentina; (ii) the sale of a 16.3% interest in Equinor’s capital stock, including, indirectly, the assignment of a 4.9% interest in Bandurria Sur, and the assignment of a 15% interest in the Bajo del Toro block to YPF.

The Company has prepared this financial information to comply with the regulatory requirements established by the Comisión Nacional Bancaria y de Valores (“CNBV” by its Spanish Acronym), which has been prepared in accordance with IFRS issued by the IASB. These were prepared on a historical cost basis, except for certain financial assets and liabilities that were measured at fair value.

This pro forma financial information should not be considered a statement, guarantee or suggestion about past or future performance. No person should rely on the usefulness or accuracy of this pro forma financial information, which is disclosed exclusively to comply with the CNBV. To the maximum extent allowed by applicable law, Vista Energy S.A.B. de C.V. and its directors, Board members, employees, affiliates and subsidiaries are released from all liability related to such pro forma information.

This pro forma information has been prepared using most reliable information at the date of these financial statements, that do not differ materially from the financial information, or pro-forma financial information, previously included in the Folleto Informativo.

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

31.1 Pro forma consolidated statement of profit or loss and other comprehensive income for the nine-month period ended September 30, 2025 (unaudited)


	Period from January 1, through September 30, 2025			Pro forma adjustments			Period from January 1, through September 30, 2025 Pro forma			Period from July 1, through September 30, 2025			Pro forma adjustments			Period from July 1, through September 30, 2025 Pro forma
Revenue from contracts with customers		1,755,133			194,866			1,949,999			706,135			116,539			822,674
Cost of sales:
Operating costs		(136,140	)		(19,977	)		(156,117	)		(51,786	)		(12,526	)		(64,312	)
Crude oil stock fluctuation		4,241			905			5,146			1,415			905			2,320
Royalties and others		(251,068	)		(33,428	)		(284,496	)		(98,523	)		(20,057	)		(118,580	)
Depreciation, depletion and amortization		(513,808	)		(69,335	)		(583,143	)		(210,891	)		(47,821	)		(258,712	)
Other non-cash costs related to the transfer of conventional assets		(24,018	)		—			(24,018	)		(9,159	)		—			(9,159	)

Gross profit		834,340			73,031			907,371			337,191			37,040			374,231

Selling expenses		(136,289	)		(10,655	)		(146,944	)		(48,816	)		(6,392	)		(55,208	)
General and administrative expenses		(95,090	)		(6,056	)		(101,146	)		(37,347	)		(6,054	)		(43,401	)
Exploration expenses		(488	)		—			(488	)		(144	)		—			(144	)
Other operating income		504,284			359			504,643			289,802			129			289,931
Other operating expenses		(30,434	)		(800	)		(31,234	)		(5,273	)		155			(5,118	)
Impairment of long-lived assets		(38,252	)		—			(38,252	)		—			—			—

Operating profit		1,038,071			55,879			1,093,950			535,413			24,878			560,291

Income (loss) from investments in associates		(3,746	)		—			(3,746	)		(2,767	)		—			(2,767	)
Interest income		8,933			6,175			15,108			7,603			6,175			13,778
Interest expense		(113,260	)		—			(113,260	)		(48,873	)		—			(48,873	)
Other financial income (expense)		(63,721	)		(511	)		(64,232	)		(53,872	)		(3,435	)		(57,307	)

Financial income (expense), net		(168,048	)		5,664			(162,384	)		(95,142	)		2,740			(92,402	)

Profit before income tax		866,277			61,543			927,820			437,504			27,618			465,122

Current income tax (expense)		(149,727	)		(38,677	)		(188,404	)		(3,119	)		(18,565	)		(21,684	)
Deferred income tax benefit (expense)		(83,182	)		(2,007	)		(85,189	)		(119,099	)		(1,174	)		(120,273	)

Income tax (expense)		(232,909	)		(40,684	)		(273,593	)		(122,218	)		(19,739	)		(141,957	)

Profit for the period, net		633,368			20,859			654,227			315,286			7,879			323,165

Other comprehensive income
Other comprehensive income that shall not be reclassified to profit (loss) in subsequent periods
- (Loss) from actuarial remeasurement related to employee benefits		(1,901	)		—			(1,901	)		(47	)		—			(47	)
- Deferred income tax benefit		665			—			665			16			—			16

Other comprehensive income for the period		(1,236	)		—			(1,236	)		(31	)		—			(31	)

Total comprehensive profit for the period		632,132			20,859			652,991			315,255			7,879			323,134

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

31.1 Pro forma consolidated statement of profit or loss and other comprehensive income for the nine month period ended September 30, 2025 (unaudited)


	Period from January 1, through September 30, 2025		Pro forma adjustments		Period from January 1, through September 30, 2025 Pro forma		Period from July 1, through September 30, 2025		Pro forma adjustments		Period from July 1, through September 30, 2025 Pro forma
Net profit for the period attributable to:
Shareholders of the parent company		633,368		15,362		648,730		315,286		5,336		320,622
Non-controlling interests		—		5,497		5,497		—		2,543		2,543
Total comprehensive profit for the period attributable to:
Shareholders of the parent company		632,132		15,362		647,494		315,255		5,336		320,591
Non-controlling interests		—		5,497		5,497		—		2,543		2,543

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)

31.2 Pro forma consolidated statement of financial position as of September 30, 2025 (unaudited)


	As of September 30, 2025			Pro forma adjustments			As of September 30, 2025 Pro forma
Assets
Noncurrent assets
Property, plant and equipment		5,408,044			1,511,468			6,919,512
Goodwill		22,576			—			22,576
Other intangible assets		12,807			—			12,807
Right-of-use assets		73,905			—			73,905
Biological assets		14,699			—			14,699
Investments in associates		50,668			—			50,668
Trade and other receivables		371,050			154,032			525,082
Deferred income tax assets		38,264			—			38,264

Total noncurrent assets		5,992,013			1,665,500			7,657,513

Current assets
Inventories		12,772			2,521			15,293
Trade and other receivables		414,812			168,767			583,579
Cash, bank balances and other short-term investments		319,657			(319,657	)		—

Total current assets		747,241			(148,369	)		598,872

Total assets		6,739,254			1,517,131			8,256,385

Equity and liabilities
Equity
Capital stock		647,752			325,000			972,752
Other equity instruments		32,144			—			32,144
Other equity accounts		—			72,909			72,909
Legal reserve		8,233			—			8,233
Share-based payments		(49,786	)		—			(49,786	)
Share repurchase reserve		179,324			—			179,324
Other accumulated comprehensive income (losses)		(12,293	)		—			(12,293	)
Accumulated profit (losses)		1,602,245			1,786			1,604,031

Equity attributable to shareholders of the parent company		2,407,619			399,695			2,807,314

Equity attributable to non-controlling interests		—			184,236			184,236

Total equity		2,407,619			583,931			2,991,550

Liabilities
Noncurrent liabilities
Deferred income tax liabilities		338,967			269,334			608,301
Lease liabilities		44,789			—			44,789
Provisions		47,536			6,196			53,732
Borrowings		2,369,659			177,098			2,546,757
Employee benefits		18,073			—			18,073
Income tax liability		14,922			—			14,922
Trade and other payables		286,206			307,921			594,127

Total noncurrent liabilities		3,120,152			760,549			3,880,701

VISTA ENERGY, S.A.B. DE C.V.

Notes to the unaudited interim condensed consolidated financial statements as of September 30, 2026 and December 31, 2025 and for the nine-month periods ended September 30, 2026 and 2025

(Amounts expressed in thousands of US Dollars, except otherwise indicated)


	As of September 30, 2025		Pro forma adjustments		As of September 30, 2025 Pro forma
Current liabilities
Provisions		13,863		—		13,863
Lease liabilities		18,046		—		18,046
Borrowings		558,289		—		558,289
Salaries and payroll taxes		25,246		—		25,246
Income tax liability		102,609		57,970		160,579
Other taxes and royalties		37,377		10,043		47,420
Trade and other payables		456,053		104,638		560,691

Total current liabilities		1,211,483		172,651		1,384,134

Total liabilities		4,331,635		933,200		5,264,835

Total equity and liabilities		6,739,254		1,517,131		8,256,385