Nvidia stock was heading for new highs early Thursday. Earnings from Microsoft and Meta Platforms reinforced expectations of continued investment in its artificial-intelligence chips. Nvidia shares were up 1.9% at $182.73 in premarket trading, putting it on track to close above $180 for the first time. The stock rose 2.1% on Wednesday.

Alphabet's valuation could soar thanks to the artificial intelligence (AI) initiatives at Google Search and Google Cloud.

Microsoft isn't slowing down. The world's second-largest company by market cap reported blockbuster fourth-quarter earnings, sending shares surging so high after hours that the tech giant is set to become a member of the exclusive $4 trillion club.