https://www.cnbc.com/2017/09/25/us-sec-chairman-notified-of-2016-agency-hack-in-august.html

The chairman of the U.S. Securities and Exchange Commission (SEC) only learned in August that hackers had last year breached the regulator's database of corporate announcements, according to prepared congressional testimony seen by Reuters on Monday.

The SEC's enforcement staff and inspector general's office have launched internal investigations into the breach and whether hackers illegally traded on non-public information they stole from the EDGAR filing system, Jay Clayton will tell the Senate Banking Committee at a hearing on Tuesday.