GROUP ONE TRADING, L.P. Information

440 S. LASALLE STREET, CHICAGO, Illinois, 60605, (312) 347-8864

Report Date: 12/31/2014

Position Statistics

Total Positions 1,901
New Positions 414
Increased Positions 835
Decreased Positions 1,006
Positions with Activity 1,841
Sold Out Positions 470
Total Mkt Value (in $ millions) 1,043

Institutional Holdings information is filed by major institutions on form 13-F with the Securities and Exchange Commission.

Sector Weighting

Basic Materials 4.38%
Capital Goods 2.06%
Conglomerates 1.01%
Consumer Cyclical 2.17%
Consumer/Non-Cyclical 1.77%
Energy 8.82%
Financial 8.28%
Healthcare 19.88%
Services 16.08%
Technology 14.46%
Transportation 2.42%
Utilities 1.99%

1,901 Positions as of 12/31/2014

Company ▲ Class Value of Shares ($1,000s) Change in Value ($1,000s) Change (%) Shares Held
21VIANET GROUP INC SPONSORED ADR 2,293 -3,738 (61.97) 112,038
22ND CENTY GROUP INC COM 48 -85 (64.04) 38,024
3-D SYS CORP DEL COM NEW 5,117 3,368 192.50 162,509
3M CO COM -32 Sold Out 0
500 COM LTD SPON ADR REP A 106 106 New 6,045
58 COM INC SPON ADR REP A 190 -1,259 (86.9) 2,692
8X8 INC NEW COM -32 Sold Out 0
A10 NETWORKS INC COM 16 16 New 3,800
AAR CORP COM 21 21 New 700
AARONS INC COM PAR $0.50 51 -185 (78.43) 1,800
ABBOTT LABS COM 5 -5 (50) 100
ABBVIE INC COM 6,705 -616 (8.41) 107,634
ABENGOA YIELD PLC ORD SHS 577 498 628.98 16,475
ABIOMED INC COM 880 855 3,324.61 13,082
ABRAXAS PETE CORP COM 249 -106 (29.85) 68,311
ACACIA RESH CORP ACACIA TCH COM 423 131 44.93 41,832
ACADIA HEALTHCARE COMPANY INC COM 196 94 91.24 2,794
ACADIA PHARMACEUTICALS COM 10,139 -5,185 (33.84) 266,604
ACCELERATE DIAGNOSTICS INC COM 375 292 353.21 17,009
ACCELERON PHARMA INC COM -7 Sold Out 0