Electric car maker Tesla Motors said it was looking to raise about $642.5 million through a share sale, above the $500 million it announced on Thursday.
The company said on Friday it would offer about 2.7 million shares at $242 per share, a slight discount to Thursday's close of $242.51.
The company's shares were up 0.7 percent at $244.10 in premarket trading.
Read More Tesla is going to $300: Technician
Chief Executive Elon Musk will maintain his investment of $20 million in the offering, Tesla said.