This week's biggest % winners & losers : May 7 - 11, 18 (wk 19)

The following are this week's top 20 percentage gainers and top 20 percentage losers, categorized by sectors (over $300 mln market cap and 100K average daily volume).

This week's top 20 % gainers

• Healthcare: OPK (4.52 +43.49%), DEPO (7.54 +27.15%), NVTA (6.92 +25.82%), OMER (19.89 +24.47%), SUPN (57.05 +24.43%), MYGN (34.86 +24.37%)
• Materials: FRTA (8.83 +27.6%)
• Industrials: ARCB (47.3 +39.94%), CECE (5.87 +25.32%)
• Consumer Discretionary: LTRPA (12.35 +35.71%), SUP (16.85 +29.62%), NCMI (7.23 +29.57%), FOSL (18.57 +27.98%), TRIP (48.99 +27.15%)
• Information Technology: PI (17.08 +31.28%), BCOR (33.45 +29.9%), VDSI (20.4 +27.5%)
• Financials: LC (3.32 +25.28%)
• Energy: EPE (2.88 +44%)
• Consumer Staples: DF (10.47 +24.64%)

This week's top 20 % losers

• Healthcare: AMPH (14.91 -20.56%), NVRO (76.7 -17.08%)
• Industrials: HDSN (2.63 -33.71%), CSTE (12.85 -31.47%), KELYA (24.5 -19.11%), HTZ (17.68 -17.27%)
• Consumer Discretionary: MDCA (4.35 -40%), ETM (7.5 -27.88%), FTD (4.77 -24.88%), CWH (21.85 -17.2%)
• Information Technology: GOGO (5.46 -34.45%), SNCR (7.03 -32.85%), SYMC (19.52 -29.89%), EXTR (8.35 -23.67%), MXL (18.89 -19.38%), MGI (6.87 -18.89%)
• Telecommunication Services: TEO (22.2 -20.74%), FTR (9.03 -20.37%)