Since 1998 when the California DMV began tracking EV registrations, unsurprisingly Tesla has dominated EV sales and through September 30, 2021 the company has accounted for 38.4% of all EV (both BEV and PHEV) registrations.
In fact, Tesla has sold more EVs in California than the next four brands combined (37.6%): Chevrolet (14.0%), Toyota (10.4%), BMW (7.5%), and Nissan (5.7%).