The electric-vehicle maker’s sales in by far the biggest EV market in the US fell almost 8% in the fourth quarter and 12% for the year, according to data sourced by the California New Car Dealers Association. Annual registrations of the Model 3 sedan dropped by more than a third.

Tesla's electric-vehicle registrations in California fell about 12% last year, according to industry data, indicating mounting challenges for the automaker in the key U.S. market.

Investors are looking for evidence Musk’s politics are hurting Tesla. It’s hard to find, but California might be turning against Musk—slowly.

For years, Tesla has been the undisputed heavyweight of California’s growing electric vehicle market. It’s dominated sales charts, crushed the competition, and made itself syn

For years, Tesla has been a leader in the electric vehicle market. The company’s products have pushed envelopes, raised the bar, and generated unprecedented buzz – along with booming sales. However, the days of Tesla’s total dominance in the EV world may be drawing to a close.

Shares of electronic-vehicle maker Tesla fell more than those of GM and Ford, despite less exposure to impacts from potential tariffs on Canada and Mexico.