The U.S. Securities and Exchange Commission is investigating a January 14 spike in trading in BlackBerry options that took place hours before Reuters reported that Samsung Electronics was in talks to buy the Canadian smartphone maker, according to a person familiar with the investigation.

One trade the SEC is looking at took place at 12:06 p.m. on that day, when there was a purchase of options with the rights to buy 200,000 shares of BlackBerry stock at a strike price of $10 a share, the person said.