GROUP ONE TRADING, L.P. Information

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

Report Date: 03/31/2015

Position Statistics

Total Positions 1,811
New Positions 392
Increased Positions 762
Decreased Positions 1,006
Positions with Activity 1,768
Sold Out Positions 513
Total Mkt Value (in $ millions) 817

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

Sector Weighting

Basic Materials 3.69%
Capital Goods 1.71%
Conglomerates 0.77%
Consumer Cyclical 2%
Consumer/Non-Cyclical 2.4%
Energy 8.87%
Financial 8.83%
Healthcare 25.74%
Services 14.67%
Technology 11.75%
Transportation 2.53%
Utilities 2.96%

1,811 Positions as of 03/31/2015

Company Class Value of Shares ($1,000s) ▼ Change in Value ($1,000s) Change (%) Shares Held
AKORN INC COM 2,293 2,252 5,542.99 49,489
ACHILLION PHARMACEUTICALS INC COM 2,271 1,379 154.58 270,698
GULFPORT ENERGY CORP COM NEW 2,249 -924 (29.12) 68,435
VIRNETX HLDG CORP COM 2,192 1,621 283.73 487,205
NOVAVAX INC COM 2,145 1,369 176.54 177,113
MARKWEST ENERGY PARTNERS L P UNIT LTD PARTN 2,134 -1,111 (34.24) 32,984
BLOCK H & R INC COM 2,081 148 7.66 62,420
NORTHSTAR ASSET MGMT GROUP INC COM 2,040 -2,584 (55.88) 112,668
LLOYDS BANKING GROUP PLC SPONSORED ADR 2,040 -779 (27.64) 377,071
ENERGY TRANSFER PRTNRS L P UNIT LTD PARTN 2,018 2,018 New 39,238
KROGER CO COM 2,008 2,008 New 51,482
HILTON WORLDWIDE HLDGS INC COM 1,985 481 32.00 74,797
LIBERTY GLOBAL PLC SHS CL A 1,978 -1,014 (33.9) 37,733
CAMERON INTERNATIONAL CORP COM 1,947 1,947 New 38,430
SEATTLE GENETICS INC COM 1,927 1,927 New 40,706
QLIK TECHNOLOGIES INC COM 1,913 -432 (18.42) 47,246
QUNAR CAYMAN IS LTD SPNS ADR CL B 1,910 896 88.44 46,998
ANGLOGOLD ASHANTI LTD SPONSORED ADR 1,890 -2,396 (55.91) 311,348
NATIONAL OILWELL VARCO INC COM 1,887 1,863 7,612.06 43,496
BOARDWALK PIPELINE PARTNERS LP UT LTD PARTNER 1,870 -2,725 (59.31) 132,042