Hackers breached the filing system of the U.S. Securities and Exchange Commission and may have accessed "nonpublic information" for profit, the agency said in a statement late Wednesday.
The SEC, which regulates the financial securities industry, gave few details on the hack but said the hackers may have made "illicit gain through trading," NBC News reported.
It is not believed that any personally identifiable information or SEC operations were compromised, the agency added.
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The hack was first detected in 2016, but the SEC didn't realize until last month that the hackers may have benefited from the data accessed.