Top Losers

Athersys (NASDAQ: ATHX) shares tumbled 55.99% to $1.20 on failed trial results for ulcerative colitis. OncoGenex Pharmaceuticals (NASDAQ: OGXI) dipped 53.61% to $4.50 after the company and Teva Pharmaceutical Industries (NYSE: TEVA) offered top-line survival results of the Phase III SYNERGY trial...

Athersys (NASDAQ: ATHX) dropped 52.38% to $1.30 in pre-market trading on failed trial results for ulcerative colitis. OncoGenex Pharmaceuticals (NASDAQ: OGXI) shares fell 47.84% to $5.06 in pre-market trading after the company and Teva Pharmaceutical Industries (NYSE: TEVA) offered top-line...

Visa (NYSE: V) shares fell 4.11% to $200.80 in pre-market trading after the company reported weaker-than-expected fiscal second-quarter revenue. The company's operating revenue surged to $3.16 billion from $2.96 billion, missing analysts' estimates of $3.19 billion. Broadcom (NASDAQ: BRCM) shares...

Parametric Sound (NASDAQ: HEAR) declined 23.85% to $9.90 after the company announced a $45 million common stock offering. Clearfield (NASDAQ: CLFD) fell 18.43% to $16.95 after the company reported FQ2 results. Silicom (NASDAQ: SILC) shares dipped 17.08% to $47.91 after the company reported Q1...

Eagle Rock Energy Partners LP (NASDAQ: EROC) shares dropped 7.22% to $4.50 in pre-market trading after the company announced the suspension of distribution. Bank of America lowered the price target on the stock from $6.50 to $5.50. Xilinx (NASDAQ: XLNX) shares fell 5.57% to $49.50 in pre-market...

Zhone Technologies (NASDAQ: ZHNE) dropped 18.75% to $3.38 after the company reported Q1 earnings of $0.01 per share on revenue of $28.60 million. Semler Scientific (NASDAQ: SMLR) shares declined 14.63% to $4.26 after the company reported first-quarter results. Federal-Mogul (NASDAQ: FDML) shares...

Cree (NASDAQ: CREE) shares dropped 6.80% to $54.10 in pre-market trading on Q3 results. Cree reported its Q3 earnings of $0.39 per share on revenue of $405.30 million. However, analysts were expecting earnings of $0.38 per share on revenue of $407.29 million. Plug Power (NASDAQ: PLUG) shares fell...

Medidata Solutions (NASDAQ: MDSO) shares slipped 17.91% to $43.25 after the company reported downbeat quarterly results. Arotech (NASDAQ: ARTX) shares declined 10.98% to $3.97 after falling 1.55% on Monday. Bebe Stores (NASDAQ: BEBE) shares declined 10.40% to $5.77 after the company reported a 5....

Arotech (NASDAQ: ARTX) dipped 7.40% to $4.13 in the pre-market session after falling 1.55% on Monday. Cabot Oil & Gas (NYSE: COG) shares dropped 6.09% to $32.98 in pre-market trading. Cabot Oil & Gas is expected to will host its Q1 earnings conference call on April 24, 2014. FireEye (...

Acme United (NYSE: ACU) dropped 8.57% to $16.00. On Thursday, Acme United posted a quarterly net income of $368,000 or $0.11 per share. Moneygram International (NASDAQ: MGI) dipped 7.93% to $13.64. JMP Securities downgraded Moneygram from Market Outperform to Market Perform. Walter Energy (NYSE:...

Acacia Research (NASDAQ: ACTG) shares fell 10.79% to $15.22 in the pre-market trading after the company reported weaker-than-expected Q1 results. BB&T (NYSE: BBT) dipped 1.13% to $37.50 in the pre-market session after the company reported downbeat Q1 earnings. Yum! Brands (NYSE: YUM) shares...

Net 1 UEPS Technologies (NASDAQ: UEPS) shares tumbled 20.82% to $7.53 after gaining 0.96% on Wednesday. Net 1 UEPS Technologies is expected to release its Q3 results on May 9, 2014. Moneygram International (NASDAQ: MGI) shares declined 12.45% to $15.75 following announcement of new money-transfer...

Net 1 UEPS Technologies (NASDAQ: UEPS) fell 36.91% to $6.00 in pre-market trading after gaining 0.96% on Wednesday. Net 1 UEPS Technologies is expected to release its Q3 results on May 9, 2014. International Business Machines (NYSE: IBM) shares dropped 4.31% to $187.94 in pre-market trading after...

xG Technology (NASDAQ: XGTI) fell 13.13% to $1.89 after the company priced $10 million public offering at $1.90 per share. ChinaNet Online Holdings (NASDAQ: CNET) shares slipped 9.92% to $1.20 after the company postponed its FY13 earnings call. ASML Holding NV (NASDAQ: ASML) shares dropped 5.47...