Roughly 1,000 companies have reported Q3 2017 earnings numbers over the last three weeks.Below is a list of the stocks that have posted the biggest one-day gains on their earnings reaction days so far this season.

As shown, Skechers (SKX) ranks first with a huge gain of 41.45% that it saw on 10/20.Syntel (SYNT) ranks 2nd with a gain of 27.23%, followed by Atlassian (TEAM), FARO Techs (FARO), and First Solar (FSLR).No other companies besides these have see one-day gains of more than 20%.

There are quite a few well-known names on the list of earnings season winners.These include Buffalo Wild Wings (BWLD), Twitter (TWTR), Amazon (AMZN), Seagate Tech (STX), and IMAX,

(Click on image to enlarge)

While there have been 45 stocks that have gained more than 10% on their earnings reaction days this season, there have been nearly as many (39) that have fallen 10% or more.Electronics for Imaging (EFII) has been the biggest loser with a one-day drop of 29.39% last Friday.EFII posted what we call a reverse triple play — it missed EPS estimates, missed revenue estimates, and lowered guidance.Acadia Healthcare (ACHC) also reported a reverse triple play, and it fell 25.93% on its earnings reaction day, ranking it second worst this season behind EFII. Six other stocks have experienced one-day drops of 20%+ on earnings this season — TRVG, VOXX, ESND, NOK, UCTT, and HAWK.Other notables on the list of biggest earnings season losers include GNC Holdings (GNC), Celgene (CELG), Expedia (EXPE), Advanced Micro (AMD), United (UAL), Whirlpool (WHR), Nutrisystem (NTRI), and Chipotle (CMG). 

(Click on image to enlarge)