This week's biggest % winners & losers: May 1 - 5, 17 (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: MOH (66.43 +33.42%), MYGN (22.38 +21.7%), EXAS (35.43 +18.06%), FOMX (4.93 +17.1%)
• Industrials: ATSG (22.99 +25.01%), KTOS (9.08 +19.16%), HSC (15.55 +19.16%), SPXC (28.29 +17.58%), PBI (15.49 +16.55%)
• Consumer Discretionary: CHGG (11.49 +27.52%), RH (57.15 +19.14%), NYT (16.95 +17.3%)
• Information Technology: ANGI (10.71 +82.14%), FORM (14.25 +28.38%), OLED (111.3 +24.57%), IAC (100.45,  +21.01%), MELI (275.16 +20.2%), FEYE (14.82, +18.47%), FSLR (34.54 +16.89%)
• Telecommunication Services: STRP (161.49 +25.32%)

This week's top 20 % losers

• Healthcare: ITCI (9.35 -32.34%), MEDP (22.98 -27.53%), PBYI (30.7 -24.38%), CERS (3.33 -23.45%), CRIS (1.89 -21.9%), AMAG (19.1 -21.72%), PGNX (6.43 -18.81%), KPTI (8.32 -18.59%)
• Materials: RYI (10 -27.01%)
• Industrials: ARCB (19.75 -25.33%)
• Consumer Discretionary: NCMI (8.67 -27%), PBPB (11.35 -18.64%)
• Information Technology: TWLO (23.97 -27.47%), AMD (10.19 -23.38%)
• Energy: CIE (0.31 -21.89%)
• Consumer Staples: REV (19.3 -25.63%), AVP (3.7 -23.71%)
• Telecommunication Services: NIHD (0.47 -45.26%), FTR (1.46 -22.34%), S