SEC Told Cybersecurity Officials About Data Hack Last Year

The U.S. Securities and Exchange Commission told government cybersecurity officials about a hack into its database of corporate filings soon after it happened last year, months before the agency’s new chairman made the breach public. Since disclosing the incident on Sept. 20, Jay Clayton has come under mounting pressure to provide additional details about the 2016 intrusion into the SEC’s Edgar system that may have led to illicit trades.