Lithium Argentina AG

Separation Process

On July 31, 2023, at the annual general and special meeting of the Company, shareholders approved the separation (the “Separation”) of the Company into Lithium Americas (Argentina) Corp. and a new company renamed “Lithium Americas Corp.” (“Lithium Americas (NewCo)”). The Separation was completed on October 3, 2023, pursuant to a final order dated August 4, 2023 from the Supreme Court of British Columbia approving the plan of arrangement. As a result of the transaction (among other things):

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The Company separated its previously-held North American business unit, comprised of 100%-owned Thacker Pass project (“Thacker Pass”), as well as investments in Green Technology Metals Ltd. and Ascend Elements, Inc., into an independent public company named “Lithium Americas Corp.”

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The Company transferred $275 million in cash to Lithium Americas (NewCo).

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The Company changed its name to “Lithium Americas (Argentina) Corp.”

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The Company retained its Argentine business unit, comprised of the 44.8% interest in Caucharí-Olaroz, the 100% interest in Pastos Grandes (which interest is subject to change upon completion of the Pastos Grandes Transaction, see “Recent Highlights” above) and the 65% interest in Sal de la Puna.

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Holders of the Company’s common shares prior to the Separation received one common share of the Company and one common share of Lithium Americas (NewCo) for each common share held immediately before the effective time of the Separation.

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The Company’s common shares concluded regular-way trading on the TSX and the NYSE under the symbol “LAC” and following the Separation, commenced trading on the TSX and the NYSE under the ticker symbol “LAAC”.

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The Company’s board of directors was reconstituted following the Separation and was comprised of John Kanellitsas, George Ireland, Franco Mignacco, Robert Doyle, Calum Morrison and Diego Lopez Casanello. On March 19, 2024, Sam Pigott and Monica Moretto were appointed to the board of directors of the Company.

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GM’s Offtake Agreement (each as defined below) was assigned to Lithium Americas (NewCo), and the GM Tranche 2 Agreements (defined below) ceased to have effect with respect to the Company, in accordance with their terms.

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The Convertible Notes (defined below) remained obligations of the Company. The Separation constituted a Make-Whole Fundamental Change as defined in the Indenture (defined below). In addition, the Separation resulted in an adjustment to the conversion rate of the Convertible Notes. No Convertible Notes were surrendered for conversion into Common Shares in connection with the Separation Transaction.

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Holders of all DSUs, RSUs and PSUs (each defined below) of the Company received, in lieu thereof, equivalent incentive securities of the Company and of Lithium Americas (NewCo). Each old unit of the

Company was replaced with one equivalent unit of Lithium Americas (NewCo) and 0.87 of a new unit of the Company.

For additional information with respect to the Separation please refer to the Company’s management information circular dated June 16, 2023 available under its profile on SEDAR+ at www.sedarplus.com.