Rescale, a San Francisco-based startup specializing in engineering software for designing race cars and computer chips, secured $115 million in venture financing.

OpenAI, the artificial intelligence company behind ChatGPT, said it has finalized a funding round that will bring in $40 billion from SoftBank Group Corp. and other investors at a $300 billion valuation, including money raised.

Microsoft went public with a $21 offering price that increased to $35.50 before the end of the day. Some 2.5 million shares were sold the first day, raising $61 million in what some analysts referred to as “the deal of the year.” Co-founder Bill Gates, then 30, sold $1.6 million in shares and retained a 45 percent stake worth $350 million. Microsoft stock climbed more than a hundredfold between 1986 and 1996.