Investors knew electric vehicle (EV) sales have been slumping for Tesla ( TSLA -8.44%). The EV leader announced a 13.5% year-over-year drop in second-quarter deliveries on July 2. Yet the stock is tanking today after Tesla reported its full second-quarter financial update today.

Tesla shares plunged as much as 10% in early trading Thursday as investors digested another dismal quarter of car sales – and CEO Elon Musk’s admission that slump may not end anytime soon.

Tesla shares are down in premarket trading Thursday as more disappointing sales data is dragging on the stock along with the lackluster second-quarter earnings report Tesla released after the closing bell on Wednesday.