Shares of General Motors surged nearly 10% Tuesday after the automaker posted a $3 billion third-quarter profit that was slightly less than a year ago.

U.S. customers who bought a new General Motors vehicle last quarter paid an average of just under $49,900, a price that helped push the company’s net income 15% above a year ago.

Despite a small dip in U.S. vehicle sales, General Motors’ first-quarter net income rose more than 25% on strong deliveries of pickup trucks and other higher-profit vehicles.

General Motors’ net income rose 12% last year despite losing more than $1 billion when many of its plants were shut down by a six-week autoworkers’ strike.

A strike by autoworkers against General Motors is expected to cut the automaker's pretax earnings by $800 million this year, and another $200 million per week after that.

General Motors posted $2.54 billion in second-quarter net income, a 52% increase over a year ago.

Strong U.S. sales helped General Motors increase its first-quarter net profit 19% over a year ago, leading the company to raise its full-year earnings guidance on expectations that people will keep buying new vehicles.

Rising factory output led to strong U.S. sales at the end of last year, pushing General Motors’ fourth-quarter net income up 16% over the same period a year ago.

General Motors’ third-quarter net profit rose 36.6% as vehicle sales began to rebound from persistent parts supply chain troubles.

Citing an improved supply of automotive computer chips, General Motors raised its financial guidance on Wednesday and said it expects to return to a normal production rate by the end of next year.

General Motors posted a healthy $2.8 billion second-quarter profit Wednesday, but its cautious outlook for the rest of the year spooked investors.

General Motors will raise spending on electric and autonomous vehicles and add two U.S. battery factories as it gambles that consumers will eagerly switch from gasoline to the new technology.