Company value is dependent on expected future profit/revenue/etc. not market share per se.
If the market grows in size and you’re able to grow revenue and profit, reduced market share in and of itself doesn’t matter.
While the U.S. market share has declined, Tesla's overall annual revenue has continued to grow from $11.75 billion in 2017 to over $97 billion in 2024, though it saw a slight decline in revenue for the 12 months ending June 30, 2025.
If the market grows in size and you’re able to grow revenue and profit, reduced market share in and of itself doesn’t matter.
While the U.S. market share has declined, Tesla's overall annual revenue has continued to grow from $11.75 billion in 2017 to over $97 billion in 2024, though it saw a slight decline in revenue for the 12 months ending June 30, 2025.
https://www.macrotrends.net/stocks/charts/TSLA/tesla/revenue