The company’s activities in mainland China, including an attempt to set up a trade center in Beijing and create a sponsored basketball team, as well as tens of millions of dollars in payments the Sands made through a Chinese intermediary, had become a focus of the federal investigation, according to reporting by The New York Times and The Wall Street Journal in August.

In its filing, the Sands said that it did not believe the findings would have material impact on its financial statements, or that they warranted revisions in its past statements. The company said that it was too early to determine whether the investigation would result in any losses. “The company is cooperating with all investigations,” the statement said.

The Sands’ activities in China came under the scrutiny of federal investigators after 2010, when Steven C. Jacobs, the former president of the company’s operations in Macau, filed a wrongful-termination lawsuit in which he charged that he had been pressured to exercise improper leverage against government officials. He also accused the company of turning a blind eye toward Chinese organized crime figures operating in its casinos.

Mr. Adelson began his push into China over a decade ago, after the authorities began offering a limited number of gambling licenses in Macau, a semiautonomous archipelago in the Pearl River Delta that is the only place in the country where casino gambling is legal.

But as with many lucrative business spheres in China, the gambling industry on Macau is laced with corruption. Companies must rely on the good will of Chinese officials to secure licenses and contracts. Officials control even the flow of visitors, many of whom come on government-run junkets from the mainland.