Shares of Cerebras Systems closed up 68% at $311.07 on Thursday, their first day of trading on the Nasdaq, valuing the company at an estimated $86 billion. Shares had opened at $350 in their public-market debut on Thursday after pricing at $185 a piece the day before. Shares of the company, which develops AI computing chips and large-scale AI systems, now trade under the ticker symbol CBRS. Earlie...