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Jensen Huang, the co-founder and chief executive of the Silicon Valley chip giant Nvidia, resigned on Thursday, according to the company’s board of directors, capping a swift, stunning fall for one of the most powerful figures in the A.I. boom.

The company’s board of directors met for several hours on Wednesday to weigh Mr. Huang’s fate after revelations that he had extramarital affairs with an executive who reports to him and with a woman whom U.S. intelligence agencies concluded was spying for China.

The company’s 10-member board said in a statement that Colette Kress, Nvidia’s chief financial officer, would serve as interim chief executive until a permanent successor to Mr. Huang is named. The board said on Thursday that it would begin a search for a permanent replacement and would consider internal and external candidates.

Mr. Huang’s exit opens an uncertain chapter for Nvidia, the premier maker of artificial intelligence chips, and will have widespread ripple effects. Over three decades, Mr. Huang, 63, built Nvidia into one of the world’s most valuable public companies, controlling an estimated 90 percent of the market for the advanced chips that are an essential component of the A.I. projects driving the U.S. economy — and are at the center of the U.S.-China tussle for dominance in A.I.

A series of reports by The New York Times showed that Mr. Huang had an affair with a Chinese businesswoman who goes by Alice Huang, who had been recruited by China’s main spy agency to gather information on Mr. Huang, and that President Trump had been warned about the relationship but took no action. Ms. Huang has not responded to requests for comment.

Though Nvidia had said that it had “no reason to believe” that Mr. Huang had compromised national security or company secrets, its board, with a track record of deference to its celebrity C.E.O., opened an investigation. The company’s share price plunged in after-hours trading on Wednesday as the board met to consider Mr.

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