This week's biggest % winners & losers: April 23 - 27, 18 (wk 17)

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: CYTK (8.65 +20.98%), ALXN (121.37 +12.61%)
• Consumer Discretionary: HZO (23.05 +29.86%), CMG (427.35 +28.74%), ORLY (263.29 +18.88%), TTS (7 +16.67%), BJRI (56.2 +13.65%), TSCO (68.43 +13.43%), HIBB (28.45 +13.12%), AAP (116.34 +12.12%), EAT (44.65 +12.1%)
• Financials: ENVA (28.75 +26.37%), SIVB (305.61 +21.84%), SC (18.63 +18.81%)
• Energy: PGH (0.96 +26.92%), HLX (7.86 +21.11%), MDR (6.89 +13.88%), STNG (2.67 +13.14%), OIS (36.45 +11.81%)
• Consumer Staples: SVU (17.03 +18.59%)

This week's top 20 % losers

• Healthcare: PRTA (12.11 -67.13%), AKRX (14.54 -26.19%), MGLN (81.4 -26.13%), LMAT (31.49 -22.21%)
• Materials: FTK (3.74 -40.82%), FCX (15.32 -20.87%)
• Industrials: MRCY (33.01 -26.63%)
• Information Technology: CYOU (18.97 -37.41%), TRVG (4.62 -28.48%), FLEX (13.03 -24.33%), AXE (59.8 -23.38%), NATI (39.45 -21.59%)
• Financials: TREE (244.7 -23.16%),
• Energy: ARCH (79.34 -20.89%), INT (21.97 -19.93%)
• Consumer Staples: HRG (11.12 -28.67%), SPB (71.03 -27.27%)