The Securities and Exchange Commission on Wednesday said its “EDGAR” public-company filing system had been hacked.SEC Chairman Jay Clayton said in a statement that last month "the Commission learned that an incident previously detected in 2016 may have provided the basis for illicit gain through trading." “Specifically, a software vulnerability in the test filing component of our EDGAR system, which was patched promptly after discovery, was exploited and resulted in access to nonpublic information," Clayton said.“We believe the intrusion did not result in unauthorized access to personally identifiable information, jeopardize the operations of the Commission, or result in systemic risk,” he said.