Netflix Inc. and chief executive officer Reed Hastings said they may face a U.S. Securities and Exchange Commission civil claim over a July Facebook post that coincided with the stock’s biggest gain in almost six weeks.

SEC staff alleges Netflix and its CEO violated rules governing selective disclosure, according to a company filing Thursday. The July 3 post by Hastings said Netflix viewing “exceeded 1 billion hours” of videos in June. The shares rose 6.2 percent that day.