Lithium Americas to Join the S&P/TSX Composite Index

Executive Summary

• Lithium Americas’ common shares will be added to the S&P/TSX Composite Index effective before the open of trading on Monday, December 22 2025.
• The inclusion highlights the company’s progress toward bringing its Thacker Pass lithium project to production by late‑2027 and underscores its role in the North American critical mineral supply chain.
• The announcement is expected to enhance visibility among institutional investors and may positively impact liquidity and valuation of LAC shares.

Key Details

• Index Addition: S&P Dow Jones Indices disclosed on December 5 2025 that Lithium Americas will be added to the S&P/TSX Composite Index, Canada’s premier equity benchmark.
• Effective Date: The addition becomes effective prior to market open on Monday, December 22 2025.
• CEO Comment: Jonathan Evans, President and CEO, stated the inclusion “demonstrates the significant progress Lithium Americas has made as we advance Thacker Pass toward production…”.
• Project Context: Thacker Pass Phase 1 targets nominal production of 40,000 t/yr of battery‑grade lithium carbonate with mechanical completion slated for late 2027.
• Ownership Structure: Joint venture between Lithium Americas (62%) and General Motors Holdings LLC (38%).
• Financing Overview: Phase 1 financing includes a $2.23 billion loan from the U.S. Department of Energy, plus strategic investments from GM and Orion Resource Partners LP.

Notable Quotes

“Our inclusion on the S&P/TSX Composite Index demonstrates the significant progress Lithium Americas has made as we advance Thacker Pass toward production to onshore industrial‑scale lithium production by late‑2027.” – Jonathan Evans, President and CEO

Materiality Assessment: Material – Positive** (The index addition is a material corporate development that can positively affect market perception and shareholder value.)