This week's biggest % winners & losers : Jan 9 - 13, 17 (wk 2)

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:ARIA (23.69 +72.42%),DXCM (85.13 +34.64%),WOOF (91.25 +28.94%),EXAS (19.04 +26.09%),SRPT (37.83 +25.76%),BKD (15.81 +24.68%),ARRY (10.87 +21.59%),EXEL (18.51 +20.82%), SGMO (4.4 +20.55%), CLVS (55.46 +20.49%),EVH (18.95 +19.18%),HQY (47.83 +18.22%)
• Materials:CENX (11.52 +28.29%),VALE (9.58 +19.9%),TCK (24.69 +17.4%)
• Industrials:SSW (11.47 +19.6%)
• Information Technology:BZUN (13.94 +19.35%)
• Energy:CCJ (13.29 +23.4%),SN (11.24 +21.78%)
• Consumer Staples:BETR (11.35 +18.85%)

This week's top 20 % losers

• Healthcare:AMAG (23 -35.57%),ENDP (13.19 -20.25%),HALO (11.39 -14.87%),ATRC (16.14 -14.74%),AGIO (41.55 -12.53%),ATRA (14.8 -11.9%),EBS (30.66 -11.54%),NVCR (7.1 -11.25%)
• Materials:RYI (11.3 -18.12%)
• Industrials:GRAM (4.8 -22.33%)
• Consumer Discretionary:VSTO (28.7 -24.63%),TRCO (29.58 -21.25%),SMRT (3.98 -11.75%),NLS (16.25 -11.2%)
• Energy:UNT (26.54 -12.26%),WMB (28.56 -11.91%),EPE (5.97 -11.82%),WFT (5.26 -11%),HLX (8.48 -10.92%)
• Consumer Staples:WDFC (102.85 -13.75%)