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DuPont ( DD ) shares tumbled Friday after a Chinese regulator said it was investigating the company's operations in the country.

China's State Administration for Market Regulation (SAMR) said Friday that it has opened an investigation into DuPont China over a suspected violation of the country's anti-monopoly law.

The agency did not provide any additional information about how DuPont is alleged to have violated the law. In its latest quarterly report , DuPont said China sales accounted for about a fifth of its revenue for the fourth quarter and full year in 2024 at $584 million and $2.345 billion, respectively.

"We are aware of a report that the State Administration for Market Regulation of the People's Republic of China has initiated an investigation," a DuPont spokesperson told Investopedia. "We take this matter very seriously and are reviewing the claims in the report."

The investigation comes the same day that China announced it would match the 34% tariff that the Trump administration levied against the country Wednesday.

The chemical giant's shares were down 11% at $60.32 Friday afternoon. Earlier in the session, they dropped to $56.18, their lowest point since late 2022.

UPDATE—This article has been updated with the latest share price information and a statement from DuPont.

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