Gainers

National General Holdings Corp. (NASDAQ: NGHC) shares jumped 65.8% to close at $33.84 on Wednesday after Allstate announced plans to acquire National General Holdings for around $4 billion. Altimmune, Inc. (NASDAQ: ALT) gained 52.2% to close at $17.03. China Finance Online Co. Limited (NASDAQ: JRJC) rose 40.7% to close at $10.20. Jumia Technologies AG (NYSE: JMIA) shares climbed 36.7% to close at $7.89. Nikola Corporation (NASDAQ: NKLA) rose 34.4% to close at $54.03. JP Morgan upgraded Nikola from Neutral to Overweight and announced a $45 price target. Clean Energy Fuels Corp. (NASDAQ: CLNE) shares gained 29.4% to close at $2.86. Chevron reported a partnership with Clean Energy on Adopt-a-Port initiative to reduce emissions. Intersect ENT, Inc. (NASDAQ: XENT) surged 29.4% to close at $17.98 after a Bloomberg report said rival Medtronic PLC has tabled a bid for the former. The board of Intersect ENT is reportedly reviewing the offer. Fluidigm Corporation (NASDAQ: FLDM) shares climbed 28.2% to close at $5.68. Edison Nation, Inc. (NASDAQ: EDNT) shares gained 27.5% to close at $3.71. The Container Store Group, Inc. (NYSE: TCS) surged 26.6% to close at $4.19. NanoViricides Inc (NYSE: NNVC) shares gained 25.9% to close at $8.71 after the company announced the drug candidates it is developing against the coronavirus demonstrated safety and tolerability in an animal model. UP Fintech Holding Limited (NASDAQ: TIGR) shares gained 25.7% to close at $6.90. Powerbridge Technologies Co., Ltd. (NASDAQ: PBTS) gained 25% to close at $2.85. MICT, Inc. (NASDAQ: MICT) rose 24.6% to close at $2.58. Hall of Fame Village, LLC (NASDAQ: HOFV) gained 24.2% to close at $8.40 after dropping 14% on Tuesday. Unum Therapeutics Inc. (NASDAQ: UMRX) climbed 23.9% to close at $2.96. Unum Therapeutics gained 9% on Tuesday after Wedbush upgraded the stock from Neutral to Outperform. Ideanomics, Inc. (NASDAQ: IDEX) rose 23.8% to close at $1.56 after dropping over 11% on Tuesday. Retractable Technologies, Inc. (NYSE: RVP) shares climbed 23.4% to close at $7.70. NantKwest, Inc. (NASDAQ: NK) shares rose 22.3% to close at $14.99. after Piper Sandler initiated coverage on the company's stock with an Overweight rating and announced an $18 price target. Enzo Biochem, Inc. (NYSE: ENZ) surged 21.8% to close at $3.02. Secoo Holding Limited (NASDAQ: SECO) shares gained 21.4% to close at $3.97. The Alkaline Water Company Inc. (NASDAQ: WTER) surged 21.3% to close at $2.45. GenMark Diagnostics, Inc. (NASDAQ: GNMK) climbed 21% to close at $18.86 after the company reported it sees preliminary Q2 sales of roughly $40.1 million. The company said "COVID-19 positively impacted second quarter placements and revenue." Envision Solar International, Inc. (NASDAQ: EVSI) shares jumped 21% to close at $12.21. Envision Solar reported closing of $11.5 million underwritten public offering and exercise of overallotment option. Ruhnn Holding Limited (NASDAQ: RUHN) surged 20.3% to close at $4.45. Broadwind, Inc. (NASDAQ: BWEN) gained 20.2% to close at $5.23. Cambium Networks Corporation (NASDAQ: CMBM) shares rose 20.2% to close at $9.04. Cambium Networks said it expects preliminary Q2 GAAP sales of $61 million. Huize Holding Limited (NASDAQ: HUIZ) gained 19.2% to close at $9.77. VBI Vaccines Inc. (NASDAQ: VBIV) gained 17.6% to close at $3.95 after gaining around 21% on Tuesday. Endologix, Inc. (NASDAQ: ELGX) shares rose 17.4% to close at $0.3639 after surging over 22% on Tuesday. Taylor Morrison Home Corporation (NYSE: TMHC) climbed 16.9% to close at $22.12 after the company announced its June sales were up 94% from last year. U.S. Auto Parts Network, Inc. (NASDAQ: PRTS) gained 16.8% to close at $10.21. Vuzix Corporation (NASDAQ: VUZI) shares jumped 16.8% to close at $3.38. Points International Ltd. (NASDAQ: PCOM) shares rose 16.8% to close at $10.34. Points International said it expects preliminary Q2 gross profit of $6.5 million to $7.1 million. Eros International Plc (NYSE: EROS) shares surged 15.9% to close at $3.71. Harmony Gold Mining Company Limited (NYSE: HMY) rose 14.7% to close at $5.79. Fulcrum Therapeutics, Inc. (NASDAQ: FULC) surged 14.6% to close at $20.70. Accolade, Inc. (NASDAQ: ACCD) shares rose 13.8% to close at $34.31. Electrameccanica Vehicles Corp. (NASDAQ: SOLO) gained 13.5% to close at $4.71 after declining over 19% on Tuesday. Chembio Diagnostics, Inc. (NASDAQ: CEMI) shares gained 12.1% to close at $4.27. Party City Holdco Inc. (NYSE: PRTY) gained 9.4% to close at $1.40 after the company announced it regained compliance with NYSE continued listing standards. Arco Platform Limited (NYSE: ARCE) climbed 8.7% to close at $46.01. Credit Suisse upgraded Arco Platform from Neutral to Outperform and raised the price target from $46 to $55. CorMedix Inc. (NYSE: CRMD) shares rose 7.5% to close at $6.15. CorMedix reported submission of defencath new drug application. Ayro, Inc. (NASDAQ: AYRO) shares rose 6% to close at $6.28.

Check out these big penny stock gainers and losers Losers

Centogene N.V. (NASDAQ: CNTG) shares dropped 18.7% to close at $19.18 on Wednesday after the company announced a primary and secondary public offering of 3.5 million shares of the company's common stock. MOGU Inc. (NYSE: MOGU) shares fell 16.4% to close at $4.95 on Wednesday after jumping 105% on Tuesday. VIVUS, Inc. (NASDAQ: VVUS) shares declined 15.8% to close at $0.68 after the company said it has completed the solicitation of an in-court prepackaged plan of reorganization, under which its creditor IEH Biopharma will take 100% ownership of VIVUS ahead of its July 7chapter 11 filing. Gilat Satellite Networks Ltd. (NASDAQ: GILT) fell 14.4% to close at $5.23. Evolus, Inc. (NASDAQ: EOLS) shares declined 13.2% to close at $3.35. Lemonade, Inc. (NASDAQ: LMND) shares tumbled 13.1% to close at $68.45. Lemonade shares added 187.1% overall in the first two days of trading at the New York Stock Exchange. Professional Diversity Network, Inc. (NASDAQ: IPDN) shares fell 12% to close at $2.06. Gevo, Inc. (NASDAQ: GEVO) dropped 11.6% to close at $0.6190 after gaining over 6% on Tuesday. S&W Seed Company (NASDAQ: SANW) fell 11.5% to close at $2.85. YRC Worldwide Inc. (NASDAQ: YRCW) dipped 11.2% to close at $2.55. Aeterna Zentaris Inc. (NASDAQ: AEZS) declined 11% to close at $0.4599. Aeterna Zentaris reported closing of $12 million public offering. Urban One, Inc. (NASDAQ: UONE) dropped 10.7% to close at $15.90. Horizon Global Corporation (NYSE: HZN) shares fell 10.7% to close at $3.25. Hepion Pharmaceuticals, Inc. (NASDAQ: HEPA) fell 10.4% to close at $3.69. NanoVibronix, Inc. (NASDAQ: NAOV) shares tumbled 10.4% to close at $1.98. On Tuesday, NanoVibronix announced it signed a two-year exclusive distribution agreement for PainShield. StealthGas Inc. (NASDAQ: GASS) dropped 10.2% to close at $2.30. VOC Energy Trust (NYSE: VOC) fell 10.2% to close at $1.9399. BELLUS Health Inc. (NASDAQ: BLU) dipped 10.1% to close at $2.97. Verrica Pharmaceuticals Inc. (NASDAQ: VRCA) shares dropped 8.9% to close at $8.80. Fuel Tech, Inc. (NASDAQ: FTEK) fell 8% to close at $1.04. Fuel Tech shares jumped 25% on Tuesday after the company announced it was awarded multiple equipment orders totaling $2.2 million. Viveve Medical, Inc. (NASDAQ: VIVE) fell 7.2% to close at $0.5989. Viveve shares jumped 14% on Tuesday after the company reported the FDA approval to conduct PURSUIT trial for improvement of stress urinary incontinence. 89bio Inc (NASDAQ: ETNB) shares fell 6.3% to close at $30.96 after the company priced its upsized 2.6 million share public offering of common stock at $27.50 per share.