88 Biggest Movers From Friday Gainers Siebert Financial Corp. (NASDAQ: SIEB ) shares climbed 121.6% to close at $8.22 on Friday on heavy volume. Catabasis Pharmaceuticals, Inc. (NASDAQ: CATB ) climbed 70.8% to close at $4.15 after the company announced the acquisition of Quellis Biosciences. GameStop Corp. (NYSE: GME ) shares added 67.9% to close at $325.00 after Robinhood said it would allow some buying of the stocks on Friday after sparking outrage over discontinuing purchases of GME, AMC, and high stocks seeing social media interest. The company’s stock dropped over 44% on Thursday. Novavax, Inc. (NASDAQ: NVAX ) surged 64.9% to close at $220.94 after the company said Thursday that its COVID-19 vaccine candidate NVX-COV2373 showed 89.3% efficacy in Phase 3 trials conducted in the United Kingdom. AMC Entertainment Holdings, Inc. (NYSE: AMC ) surged 53.7% to close at $13.26 after Robinhood said it would allow some buying of the stocks on Friday after sparking outrage over discontinuing purchases of GME, AMC, and high stocks seeing social media interest.