This week's biggest % winners & losers : Jan 8 - 12, 18 (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: ATRA (28.25 +52.7%), ALDR (17.85 +37.84%), GBT (56.6 +36.39%), PTCT (23.29 +29.89%), CYH (5.15 +26.23%), MYOK (52.9 +25.06%), NVAX (1.61 +24.81%), NKTR (72 +24.65%), AGIO (75.11 +22.55%), SGRY (15.2 +20.16%)
• Consumer Discretionary: DDS (70.00 +19.97%)
• Information Technology: DST (83.51 +30.85%), STX (51.26 +19.38%), DDD (11.19 +19.17%), SSNC (49.47 +18.21%)
• Financials: AFSI (13.01 +25.22%)
• Energy: BPT (26.15 +22.2%), EMES (9.71 +21.38%)

This week's top 20 % losers

• Healthcare: AXON (2.09 -61.08%), NVTA (7.58 -24.58%), BABY (28.95 -20.47%), INSY (8.84 -17.38%), ARNA (34.95 -14.42%), TRVN (1.75 -13.37%), TDOC (32.65 -12.93%), NUVA (53.33 -12.59%)
• Materials: KLDX (2.13 -13.77%)
• Industrials: AYI (158.74 -14.36%)
• Consumer Discretionary: EXPR (7.26 -20.66%), BGFV (6.08 -20.07%), GPRO (6.23 -17.15%), PLAY (47.92 -14.99%)
• Information Technology: AMBA (54.92 -13.67%), RENN (11.42 -12.09%)
• Financials: ORC (7.87 -13.61%), GCAP (8.4 -13.58%)
• Consumer Staples: SVU (16.33 -21.83%)