Microsoft Corp. once again surpassed $4 trillion in valuation, joining artificial intelligence chipmaker Nvidia in the exclusive club that also briefly included Apple on Tuesday. The sky-high valuations highlight the investor frenzy around artificial intelligence.

Earlier in the day, OpenAI said it has reorganized its ownership structure and converted its business into a public benefit corporation after two crucial regulators, the Delaware and California attorneys general, said they would not oppose the plan. It also said has signed a new agreement with its longtime backer Microsoft that gives the software giant a roughly 27% stake in OpenAI’s new for-profit corporation.

The news gave Microsoft’s shares a boost as the stock closed up 2% at $542.07, valuing the technology giant at $4.04 t

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