The U.S. Securities and Exchange Commission is concerned that data stolen from companies in cyberattacks is being used to conduct what effectively is insider trading, Reuters reported on Tuesday.

The securities regulator asked at least eight publicly traded companies for information on data breaches, the report said quoting “people familiar with the matter.” The companies were not identified.

The investigation, which is being conducted in parallel with one by the U.S. Secret Service, said Reuters, involves a group dubbed FIN4 by computer security company FireEye.

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