Mr. Huang acknowledged last Sunday that he’d had an affair with Ms. Huang, and Nvidia’s board of directors said they had begun an investigation into his conduct. On Wednesday, The New York Times reported that he also had an extramarital relationship with an executive at Nvidia who reported to him. He abruptly stepped down as chief executive the next day from the company he had led for more than 30 years.

The chip maker’s stock has fallen about 30 percent below its all-time high, which was set just over a month ago, erasing more than $1 trillion in market value.

The scandal has trained attention on Megaspeed, a small company that purchased billions of dollars of Nvidia’s coveted chips from 2024 to 2026.

That set off an investigation by the U.S. Department of Commerce as to whether some of the chips were funneled to China, in possible violation of American export restrictions. The United States has not lodged any formal charges against the company.

On Thursday, Megaspeed’s chief executive, James Tan, said in a statement that the company had not broken U.S. laws, had cooperated with Commerce Department investigators and was “ready to cooperate fully with any other relevant U.S. government authority.”