Exhibit 99.1

LITHIUM ARGENTINA AG

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION

(Unaudited)

(Expressed in thousands of US dollars)

Nature of Operations and Going Concern (Note 1)

Approved for issuance on May 11, 2026

On behalf of the Board of Directors:

LITHIUM ARGENTINA AG

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS)

(Unaudited)

(Expressed in thousands of US dollars, except for per share amounts; shares in thousands)

LITHIUM ARGENTINA AG

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(Unaudited)

(Expressed in thousands of US dollars, shares in thousands)

LITHIUM ARGENTINA AG

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

(Expressed in thousands of US dollars)

Lithium Argentina AG (“Lithium Argentina”, the “Company” or “LAR”), is a Swiss- domiciled resource company with lithium projects located in Argentina.

On January 23, 2025, the Company completed a plan of arrangement under the laws of the province of British Columbia (the “Arrangement”) involving the Company’s continuation from the province of British Columbia under the name “Lithium Americas (Argentina) Corp.” into Zug, Canton of Zug, Switzerland, as a Swiss share corporation under the name “Lithium Argentina AG.” As a result, the Company ceased to be governed by the Business Corporations Act (British Columbia). Following the Arrangement, the shareholders of the Company prior to the Arrangement continued to hold all the issued and outstanding common registered shares of the Company (the “Continuation”) (Note 13). On January 27, 2025, the Company began trading under the new symbol “LAR” on the Toronto Stock Exchange (“TSX”) and the New York Stock Exchange (“NYSE”).

The Company's registered office is located at Dammstrasse 19, 6300 Zug, Switzerland.

The Company is focused on the operations of the Cauchari-Olaroz project (“Cauchari-Olaroz”). Cauchari-Olaroz is a lithium brine operation located in the Salar de Olaroz and Salar de Cauchari in Jujuy province, north-western Argentina. The Company’s interest in Cauchari-Olaroz is held through a 44.8% ownership interest in Minera Exar S.A. (“Minera Exar”), a company incorporated under the laws of Argentina. Ganfeng Lithium Co. Ltd. (“Ganfeng”) owns 46.7% of Minera Exar with the remaining 8.5% interest held by Jujuy Energia y Mineria Sociedad del Estado (“JEMSE”), a mining investment company owned by the provincial government of Jujuy. Cauchari-Olaroz is in the production stage and achieved commercial production effective October 1, 2024, and is accounted for using the equity method.

The Company also owns 85.1% interest in the Pastos Grandes lithium project (“Pastos Grandes”) acquired through the acquisition of Millennial Lithium B.V. (“Millennial”) on January 25, 2022, and a 65% ownership interest in the Sal de la Puna project (“Sal de la Puna”), held by the Company’s wholly-owned subsidiary Arena Minerals Holdings B.V. (“Arena Minerals”) which was acquired on April 20, 2023. Pastos Grandes and Sal de la Puna are lithium brine projects located in Salta province, in north-western Argentina. Pastos Grandes is fully consolidated in the Company’s financial statements, whereas Sal de la Puna is accounted for using the equity method.

These consolidated interim financial statements have been prepared on a going concern basis, which assumes that the Company will be able to meet its obligations and continue its operations for at least the next twelve months.

As at March 31, 2026, the Company had cash and cash equivalents of $97,433 (2025 - $61,134) and equity-settleable convertible notes with a face value of $258,750 due on January 15, 2027. Additionally, in March 2026, the Company entered into a six-year $130,000 debt facility with Ganfeng bearing interest at SOFR plus 2.5% (the “Debt Facility”) (Note 21). In addition, subsequent to March 31, 2026, LAR received $6,468 from Exar Capital as a repayment of a portion of outstanding loan interest (Note 22).

During Q1 2026, realized lithium carbonate prices increased to an average of $16,818 per tonne. For the year ended 2026, Cauchari-Olaroz is expected to produce between 35,000 and 40,000 tonnes of lithium carbonate on a 100% basis and generate significant operational cash flow. In accordance with the shareholder agreement that regulates governance of Cauchari-Olaroz, any excess cash flow (as defined in the shareholder agreement), from Cauchari-Olaroz is distributed among the Company and Ganfeng until a joint decision on any expansion plan is finalized.

The Company expects distributions from Cauchari-Olaroz to be sufficient to service the current portion of its long-term debt. However, its ability to maintain normal operations and meet these obligations ultimately depends on generating and repatriating sufficient cash flows from lithium carbonate production at Cauchari-Olaroz, or alternatively, securing additional financing.

The significance of the assumptions underlying the forecast cash flows from Cauchari-Olaroz, the amount and timing of distribution of the cash flow to the Company and the requirement to satisfy the current portion of long-term debt, gives rise to material uncertainty which may cast significant doubt (or substantial doubt as contemplated by Public Company Accounting Oversight Board (“PCAOB”) standards) on the Company’s ability to continue as a going concern. Although the Company has been successful in obtaining distribution of cash flow from Cauchari-Olaroz and obtaining financing in the past, there can be no assurance that it will be able to distribute sufficient additional cash flow and obtain adequate financing in the future or that such financing will be available on terms acceptable to the Company.

If the Company is unable to continue as a going concern, material adjustments to the recoverability and amounts of assets and liabilities, the reported expenses, and the balance sheet classifications of assets and liabilities may be required. These consolidated financial statements do not include any adjustments that may result from the outcome of this uncertainty.

These condensed consolidated interim financial statements of the Company (“Interim Financials”) have been prepared in accordance with IFRS Accounting Standards applicable to the preparation of interim financial statements, under International Accounting Standard 34, Interim Financial Reporting and were approved by the Board of Directors on May 11, 2026. The Interim Financials should be read in conjunction with the Company’s annual consolidated financial statements for the year ended December 31, 2025 (the “2025 Annual Financials”), which have been prepared in accordance with IFRS Accounting Standards.

The Interim Financials are expressed in United States dollars (“US$”), the Company’s presentation currency. The same accounting policies and methods of computation have been used in the Interim Financials and 2025 Annual Financials other than those disclosed in Note 3.

Estimation Uncertainty and Accounting policy judgments

The preparation of these Interim Financials in conformity with IFRS Accounting Standards applicable to the preparation of interim financial statements requires judgments, estimates, and assumptions that affect the amounts reported. Those estimates and assumptions concerning the future may differ from actual results. Estimates and judgments are continually evaluated and are based on historical experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances.

The nature and number of significant estimates and judgments made by management in applying the Company’s accounting policies and the key sources of estimation uncertainty are the same as those that management applied to the 2025 Annual Financials except as disclosed below.

New IFRS Pronouncements

Amendments to IFRS 9 and IFRS 7 – Amendments to the Classification and Measurement of Financial Instruments

The Company adopted the amendments to IFRS 9 and IFRS 7, Amendments to the Classification and Measurement of Financial Instruments effective January 1, 2026. These amendments clarified the recognition and derecognition date of certain financial assets and liabilities, and amended the requirements related to settling financial liabilities using an electronic payment system. It also clarified how to assess the contractual cash flow characteristics of financial assets in determining whether they meet the solely payments of principal and interest criterion, including financial assets that have environmental, social and corporate governance (ESG)-linked features and other similar contingent features. These amendments require additional disclosures for financial instruments with contingent features that do not relate directly to basic lending risks and costs and amended disclosures relating to equity instruments designated at fair value through other comprehensive income.

Upon adoption, the Company applied the optional exemption permitting derecognition of financial liabilities settled through qualifying electronic payment systems at the date the payment instruction is released, rather than the settlement date. Management assessed the Company’s payment processes and determined that the criteria for application of this exemption are met.

The adoption of these amendments did not have a material impact on the Company’s condensed consolidated interim financial statements and did not result in any significant changes to the classification or measurement of financial instruments.

IFRS 18 Presentation and Disclosure in Financial Statements

In April 2024, the International Accounting Standards Board (“IASB”) issued IFRS 18, Presentation and Disclosure in Financial Statements which will replace IAS 1, Presentation of Financial Statements. IFRS 18 introduces new requirements on presentation within the statement of profit or loss, including specified totals and subtotals.

It also requires disclosure of management-defined performance measures and includes new requirements for aggregation and disaggregation of financial information based on the identified ‘roles’ of the primary financial statements and the notes.

In addition, there are consequential amendments to other accounting standards; some requirements previously included in IAS 1 have been moved to IAS 8 and limited amendments have been made to IAS 7 and IAS 34. IFRS 18 is effective for the reporting period beginning on or after January 1, 2027, with early application permitted. Retrospective application is required in both annual and interim financial statements. The Company is currently assessing the impact of this standard on its financial statements and has not yet applied it.

The amendments are effective for annual periods beginning on or after January 1, 2026. Early adoption is permitted, with an option to early adopt the amendments for contingent features only. The Company is currently assessing the impact of these amendments on its financial statements and has not yet applied it.

Cash and cash equivalents

As at March 31, 2026, cash and cash equivalents included $119 held in Canadian dollars (December 31, 2025 – $65), $97,239 in US dollars (December 31, 2025 – $59,152), $54 in Argentine Pesos (December 31, 2025 – $1,872) and $21 in Swiss Francs (December 31, 2025 – $45). During the three months ended March 31, 2026, cash and cash equivalents generated an interest income of $700 (2025 – $730).

The Company holds a 65% interest in the Sal de la Puna project through its wholly-owned subsidiary, Arena Minerals. This interest is held via a joint venture interest in Sal de la Puna Holdings S.a.r.l, the 100% owner of Argentine entity, Puna Argentina S.A.U. (“PASA”), the owner of the claims forming part of the Sal de la Puna Project.

The remaining 35% of PASA is owned by joint venture partner Ganfeng New Energy Technology Development (Suzhou) Co., Ltd. Therefore, after the acquisition of Arena Minerals, the Company holds a 65% ownership interest in the Sal de la Puna Project covering approximately 13,852 hectares of the Pastos Grandes Basin.

The Company’s 65% ownership interest in Sal de la Puna is a joint venture and is accounted for using the equity method of accounting. Changes in the investment balance are summarized below:

As at March 31, 2026, the Company, Ganfeng, and JEMSE hold 44.8%, 46.7%, and 8.5% equity interests, respectively, in Minera Exar, the entity that holds all rights, title, and interest in the Cauchari-Olaroz project, located in the Jujuy province of Argentina. The Company and Ganfeng are also 49% and 51% shareholders, respectively, in Exar Capital, a company that provides shareholder financing to Minera Exar. Minera Exar and Exar Capital are associates of the Company and are accounted for using the equity method of accounting. The investment in Minera Exar and Exar Capital together is referred to as the “Investment in Cauchari-Olaroz project.”

The Company’s operations related to Cauchari-Olaroz are conducted through its equity investees, Minera Exar and Exar Capital, which are governed by a shareholders’ agreement between the Company and Ganfeng. The agreement regulates key aspects of governance and provides the Company with significant influence over Minera Exar. Under the agreement, the Company and Ganfeng are entitled to the project’s production offtake on a 49%/51% basis, and construction costs are shared on the same pro-rata basis.

JEMSE Receivable

The Company has long-term receivables from JEMSE arising from arrangements under which JEMSE reimburses the Company for certain historical project funding through the assignment of a portion of future dividends from Minera Exar.

During 2025, the Company recognized adjustments to the carrying value of these receivables based on updated cash flow estimates, including the recognition of an additional receivable in connection with the loan restructuring completed during the year.

As at March 31, 2026, the total carrying value of the long-term receivables from JEMSE was $8,269 (December 31, 2025 – $8,077).

2025 Restructuring of Loans

During the year ended December 31, 2025, as part of a restructuring of loans (the “Restructuring”), the Company and Ganfeng amended and restated loan agreements relating to loans advanced to Exar Capital. Concurrently, Exar Capital amended and restated agreements relating to the loans advanced to Minera Exar (collectively, the “Amendments”), revising interest rates to market levels effective for fiscal year 2025 and subsequent periods and extending the maturity dates. These modifications were treated as an extinguishment of the existing loans and the issuance of new loans at market rates of interest.

As part of the Restructuring, on August 27, 2025, Exar Capital assigned certain loan receivables from Minera Exar to the Company and Ganfeng. The total carrying value of the loans assigned was $208,121, of which the Company’s portion amounted to $101,979. In exchange, the Company cancelled loans owed by Exar Capital with a carrying value of $99,422. The assigned loans receivable from Minera Exar were subsequently settled through a capital contribution by the Company and Ganfeng to Minera Exar.

Because the Restructuring resulted from transactions between shareholders rather than with external parties, the Company determined that the net effect represented a transaction between owners in their capacity as owners. Accordingly, the capitalization of loans was recorded as an increase in the Company’s investment in the Cauchari-Olaroz project, with no gain or loss recognized in the statement of comprehensive loss.

In connection with the Restructuring, JEMSE retained its ownership interest in Minera Exar in exchange for an agreement to reimburse the Company and Ganfeng through the assignment of one-third of dividends otherwise payable to JEMSE in future periods, up to an additional $8,271 and $8,609, respectively, after the previous dividend assignment has been fully repaid. The Company recognized its portion of the additional JEMSE receivable at fair value of $2,789 and recorded a reduction in its investment of $8,668, resulting in a loss of $5,879 in the third quarter of 2025. The fair value of the additional long-term receivable from JEMSE was estimated by discounting the Company’s share of expected future reimbursements by JEMSE to their present value, reflecting the timing of settlement through the assignment of future dividends otherwise payable to JEMSE. The valuation assumed a discount rate of 10%. The timing of expected reimbursements was estimated based on projected cash flows of Minera Exar.

Investment in Cauchari-Olaroz Project

Changes in the Investment in Cauchari-Olaroz Project are summarized below:

For the three months ended March 31, 2026, the Company recognized its share of income from the Cauchari-Olaroz project totaling $22,068 in the statement of comprehensive income.

The following is the condensed financial information of Minera Exar on a 100% basis, as amended to reflect the Company’s accounting policies.

As of March 31, 2026, Minera Exar’s outstanding third-party debt amounted to $326,745 (December 31, 2025 – $292,690), while its cash balance was $71,203 (December 31, 2025 – $86,882). During the quarter, Minera Exar repaid in full the $72,015 credit facility previously owed to PGCo., funded through the local capital market transactions described below. The total debt includes the following:

The Company and Ganfeng have negotiated a three-year extension of the maturity of $100,000 of these loans, which has been approved by the regulatory authority. The loan is secured by a standby letter of credit provided by Ganfeng. As the standby letter of credit was issued for a standard one-year term, the loan was initially structured with a one-year maturity to align with the term of the standby letter. Upon extension of the related standby letter of credit, the loan will automatically roll over for the remainder of the three-year term. Included within these loans is $120,000 in bank debt facilities closed in the second quarter of 2025 and fully drawn in the third quarter of 2025 to refinance maturing short-term loans and for other purposes. These loans were priced at approximately SOFR plus 2.5%, including fees. In early May 2026, the banks approved extension of these loans for three years and potential increase up to $170,000, closing of the extension is in progress.

Minera Exar has to settle certain loans provided by Exar Capital in US$ with sufficient Argentine Pesos (“ARS$”) at the implied market exchange rate. This settlement mechanism requires Minera Exar to repay the loans with more US$ at the official exchange rate. Since the repayment mechanism for the USD loans provided by Exar Capital is linked to the implied market foreign exchange rate in Argentina rather than the official foreign exchange rate, it results in an embedded derivative in the loans payable by Minera Exar. The fair value of this embedded derivative fluctuates with changes in the spread between the implied market exchange rate and the official exchange rate. During the three months ended March 31, 2026, the spread widened modestly resulting in a fair value loss of $8,256, which was recognized in Minera Exar’s condensed statement of comprehensive income.

The Company has entered into loan agreements with Exar Capital. Changes in the balances of loans to Exar Capital are summarized below.

The loans provided by the Company to Exar Capital are thereafter advanced to Minera Exar to finance the construction of Cauchari-Olaroz, and to support its working capital and other funding requirements.

Under the amended and restated loan agreements, the loans advanced by the Company to Exar Capital bear interest rates ranging from 8.12% to 8.95% per annum, with revised maturity dates ranging from 2028 to 2035.

In February 2026, following loan repayment by Minera Exar, the Company received $61,292 (Note 9) and used a portion of these proceeds to acquire from Ganfeng receivables owing from Exar Capital totaling $26,005.

During the three months ended March 31, 2026, Exar Capital utilized its existing cash balance to repay a portion of its outstanding interest on loan, amounting to $6,468.

As of March 31, 2026, the total outstanding loans to Exar Capital, including accrued interest, amounted to $334,504, with scheduled maturity and interest rates as follows:

The recoverability of these loans is dependent on the future cash flows and performance of the Cauchari-Olaroz project. The Company performed an expected credit loss assessment based on the anticipated future performance and cash flow projections of Cauchari-Olaroz. The assessment did not identify any significant increase in credit risk or other factors that would indicate a potential default.

Offtake Agreement with Ganfeng and Bangchak

The Company and Ganfeng are entitled to a share of offtake from production at Cauchari-Olaroz. The Company is entitled to 49% of the offtake, which would amount to approximately 19,600 tonnes per annum (“tpa”) of lithium carbonate assuming full capacity is achieved. The Company has entered into an offtake agreement with each of Ganfeng and BCP Innovation PTE. LTD (“Bangchak”), a wholly-owned subsidiary of Bangchak Corporation Public Company Ltd., to sell a fixed amount of offtake production at market-based prices, with Ganfeng entitled to 80% of the first 12,250 tpa of lithium carbonate (9,800 tpa assuming full production capacity) and Bangchak entitled to up to 6,000 tpa of lithium carbonate (assuming full production capacity).

The balance of the Company’s offtake entitlement, amounting to up to approximately 3,800 tpa of lithium carbonate, is uncommitted, but for limited residual rights available to Bangchak to the extent production does not meet full capacity.

Purchases and sales of lithium carbonate

During the three months ended March 31, 2026, the Company purchased its 49% share of Minera Exar’s lithium carbonate shipped during the period. The Company sold the purchased lithium carbonate to Ganfeng and Bangchak and acted in the capacity of agent in such sales transactions, as the Company’s acquisition of title to lithium carbonate was simultaneous with the sale of lithium carbonate to Ganfeng and Bangchak and the Company was not directly exposed to inventory or price risk related to lithium carbonate.

During the three months ended March 31, 2026, the Company made approximately $89,971 worth of purchases of lithium carbonate from Minera Exar and sold an equivalent amount, totaling approximately $89,971, to Ganfeng and Bangchak. Since there was no net commission earned by the Company, there was no impact on the Company’s statement of comprehensive loss for three months ended March 31, 2026.

As at March 31, 2026, the Company had a payable of $73,201 to Minera Exar for lithium carbonate purchases, and receivables totaling $65,588 from Ganfeng for sales of lithium carbonate, as disclosed on the statement of financial position. The Company performed an expected credit loss assessment for these receivables, and concluded that the expected credit loss was insignificant, given the short-term nature of the balances and the counterparties' history of timely settlement. Majority of these receivables were fully settled subsequent to March 31, 2026.

The Company owns an 85.1% interest in Proyecto Pastos Grandes S.A. (“PGCo”), which holds the Pastos Grandes project in Salta, Argentina. The remaining 14.9% interest in PGCo is held by Ganfeng. As the Company controls PGCo, PGCo is consolidated in the Company’s condensed consolidated interim financial statements. Ganfeng’s 14.9% interest is presented as non-controlling interest.

Loans to Minera Exar

In the third quarter of 2024, PGCo entered into a loan facility with Minera Exar with an aggregate principal of $65,000 to fund debt repayment, working capital, and other operational requirements.

On February 9, 2026, Minera Exar fully repaid the loan outstanding to PGCo, including accrued interest, totaling $72,015.

2025 Share Premium Reduction and Shareholder Distribution

During the fourth quarter of 2025, PGCo executed a share premium reduction and related distribution to its shareholders.

The shareholder distribution payable was denominated in Argentine pesos and indexed for inflation until settlement. At December 31, 2025, the total payable at the PGCo level attributable to Ganfeng for its non-controlling interest in PGCo was $12,859.

2026 Amendment to PGCo Share Premium Reduction and Shareholder Distribution

In March 2026, the Board and shareholders of PGCo approved an amendment to the previously approved share premium distribution. On March 12, 2026, the shareholder distribution payable was novated from an Argentine peso, inflation-indexed liability into a fixed U.S. dollar liability of $80,031, with no further inflation indexation after October 22, 2025.

During the three months ended March 31, 2026, PGCo settled the shareholder distribution payable to Ganfeng through a combination of cash payment of $10,723 and capitalization of $1,194 as a contribution to PGCo. Following the amendment and settlement, the shareholder distribution payable to Ganfeng was fully extinguished as at March 31, 2026.

1 The “Other” category includes right of use assets with a cost of $1,373 and $681 of accumulated depreciation as at March 31, 2026.

Exploration and evaluation assets were as follows:

The Company has certain commitments for royalty and other payments to be made for Pastos Grandes as set out below. These amounts will only be payable if the Company continues to hold the subject claims in the future and the royalties will only be incurred if the Company starts production from the project.

Pastos Grandes:

On December 6, 2021, the Company closed an offering (the “Offering”) of $225,000 aggregate principal amount of 1.75% Convertible Notes due in 2027 (the “Convertible Notes”, “Notes”, or “equity-settleable convertible notes”). On December 9, 2021, the initial purchasers under the Offering exercised in full their option to purchase up to an additional $33,750 aggregate principal amount of the Convertible Notes, increasing the total Offering size to $258,750.

The Convertible Notes represent financial instruments that include a debt host accounted for at amortized cost and conversion option and redemption option derivatives, which are separated from the debt host and accounted for at fair value with changes in fair value recorded in the statement of comprehensive loss. These derivatives are accounted for together as a single derivative when separated from the debt host.