Lithium Argentina AG — Proxy Solicitation & Information Statement 2026

Apr 2, 2026

Computershare
510 Burrard St, 3rd Floor
Vancouver BC, V6C 3B9
www.computershare.com

Date: April 2, 2026

To: All Canadian Securities Regulatory Authorities
Toronto Stock Exchange

Subject: LITHIUM ARGENTINA AG

Dear Sir/Madam:

We advise of the following with respect to the upcoming Meeting of Security Holders for the subject
Issuer:

Meeting Type : Annual General Meeting
Record Date for Notice of Meeting : April 29, 2026
Record Date for Voting (if applicable) : June 1, 2026
Beneficial Ownership Determination Date : June 1, 2026
Meeting Date : June 19, 2026
Meeting Location (if available) : Zug, Switzerland
Issuer sending proxy related materials directly to NOBO: No
Issuer paying for delivery to OBO: Yes

Notice and Access (NAA) Requirements:

NAA for Beneficial Holders Yes
Beneficial Holders Stratification Criteria: Not Applicable
NAA for Registered Holders Yes
Registered Holders Stratification Criteria: Not Applicable

Voting Security Details:

Description	CUSIP Number	ISIN
COMMON SHARES	H5012F103	CH1403212751

Sincerely,

Computershare

Agent for LITHIUM ARGENTINA AG