Cerebras and Microsoft shares posted significant gains during midday trading on Friday, May 15, 2026, amid strong IPO demand and new investor interest.
These movements signal a continued high appetite for artificial intelligence infrastructure and semiconductor stocks, as well as confidence in established tech giants during price corrections.
Cerebras saw a dramatic increase, with its stock jumping 68% [2]. The company's shares opened at $350, which is nearly double its initial public offering price [2]. Market analysts said the surge is due to strong demand for the IPO and a general positive sentiment toward chip stocks [2].
Microsoft shares rose nearly four percent [1]. The climb followed a disclosure from Pershing Square investor Bill Ackman, who said he has been accumulating the stock. Ackman began buying shares after the company experienced a dip following its second-quarter earnings report [1].
Other companies saw notable activity during the same trading window. ServiceNow and Papa John's were also among the stocks making the biggest moves midday [1].
The volatility in the chip sector highlights the current market trend where new entrants in the AI hardware space can achieve rapid valuation increases. Meanwhile, the reaction to Ackman's accumulation suggests that institutional investors are viewing recent dips in mega-cap tech stocks as buying opportunities [1].
“Cerebras stock jumped 68%”
The simultaneous surge of a new AI chip player and a recovery in Microsoft underscores a bifurcated but bullish AI trade. While the market is rewarding high-growth IPOs like Cerebras with aggressive premiums, the entry of high-profile investors like Bill Ackman into Microsoft suggests a belief that the fundamental value of established AI platforms remains intact despite short-term earnings volatility.
