HealthStream (HSTM) Earnings Leak?

The weight of evidence for the US and Canadian markets has improved in the past two weeks, but I still see a bearish bias on the long term. Nevertheless, I continue to watch the markets and maintain my watchlist. This morning I searched the Priority List for stocks moving up on high volume. There were several, including TSCO, PZZI, and SO, but the one that caught my eye was Healthstream, Inc. (NASDAQ: HSTM). It had a huge move on Friday (up 14% on four-times average volume, closing at the session high) combined with the fact that it will be announcing earnings on Monday after the market closes. I'm wondering if news about the company's earnings leaked out early. If so that could set the stage for post-earnings announcement drift (PEAD).