This week's biggest % winners & losers : April 30 - May 4, 18 (wk 18)

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: THC (31.23 +28.68%), CYH (4.79 +26.05%), CHRS (15.28 +24.44%), PTLA (42.11 +23.16%)
• Consumer Discretionary: SHAK (56.4 +19.34%), MBUU (40.74 +19.07%)
• Information Technology: NANO (35.46 +42.24%), P (6.98 +27.61%), MTSI (21.51 +26.46%), FDC (19.15 +25.33%), NSIT (43.39 +23.2%), RTEC (31.48 +22.23%), GLUU (5.3 +21.72%)
• Financials: FNGN (44.53 +31.15%), GHL (23.98 +18.69%)
• Energy: CRC (31.45 +28.31%), PES (4.48 +27.86%)
• Telecommunication Services: FTR (11.23 +33.31%)

This week's top 20 % losers

• Healthcare: AMN (51.73 -22.1%), CAH (52.84 -19.72%), OSUR (14.52 -19.69%), AKRX (11.78 -18.98%)
• Materials: GLT (16.52 -22.22%)
• Industrials: LKSD (12.4 -30.25%), QUAD (18.46 -26.27%), RRD (6.55 -25.57%), FLR (45.81 -23.94%), ARNC (17.24 -23.2%), PBI (8.65 -20.25%), JBT (88 -19.45%)
• Information Technology: COMM (27.97 -28.04%), DBD (11.78 -27.09%), MTCH (34.95 -24.04%)
• Energy: TCP (25.47 -25.83%), BAS (12.93 -19.44%)
• Telecommunication Services: S (5.28 -18.85%)