Last Friday turned out to be a monster day for a handful of companies that reported earnings either that morning or the night before. In fact, of stocks trading greater than $10/share, the five best performers on their Q4 2018 earnings reaction days (companies reporting between January 10th and February 22nd) all occurred last Friday.

Pulled from our popular Earnings Explorer tool, below we show a list of this season’s best-performing stocks on earnings. Again, to make the list, the stock had to be trading for more than $10/share at the close prior to its earnings report. As shown, metalworking company Dynamic Materials (BOOM) ranks first with a gain of 37.51% last Friday. Media marketing company Trade Desk (TTD) ranks 2nd with a gain of 31.39%, followed by Wayfair (W) at +27.86%, Roku (ROKU) at +25.23%, and Zillow Group (ZG) at +24.67%.

The best performing stock on earnings that didn’t report last Friday was toy-maker Mattel (MAT), which gained 23.22% on February 8th following its report after the close on the 7th. Other notables on the list of biggest winners this earnings season include Advanced Micro (AMD), 1-800-Flowers (FLWS), and Xilinx (XLNX).

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Along with seeing the 5 best performers on earnings this season, last Friday also saw the 1st and 3rd worst performers. Online shipping company Stamps.com (STMP) reported earnings after the close on Thursday the 21st, and the company also announced that it was ending its exclusive partnership with the US Postal Service. Investors sold first and asked questions later. As shown below, STMP lost 57.77% of its value on Friday, which was nearly 30 percentage points more than the 2nd biggest loser this earnings season. Third, on the list of biggest losers, this earnings season is Kraft Heinz (KHC), which dropped 27.46% on Friday.

There was nothing special about last Friday that would have caused outsized gains or losses for companies reporting earnings, but there were certainly a lot of fireworks!

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