Shares of 8x8 Inc (NASDAQ: EGHT) jumped 13.3% in pre-market trading after reporting better-than-expected Q4 results, with adjusted earnings of 11 cents per share and revenue of $185.25 million. GCL, PETZ, WOK, MEHA, HAO, TDIC, FEED, KELYA, and AMC were among the top gainers, while RUBI, AMIX, IPW, ANVS, and WGRX were among the top losers in pre-market trading.