GROUP ONE TRADING, L.P. Information

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

Report Date: 06/30/2015

Position Statistics

Total Positions 1,739
New Positions 444
Increased Positions 906
Decreased Positions 779
Positions with Activity 1,685
Sold Out Positions 362
Total Mkt Value (in $ millions) 918

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

Sector Weighting

Basic Materials 4.16%
Capital Goods 1.2%
Conglomerates 0.88%
Consumer Cyclical 1.39%
Consumer/Non-Cyclical 2.61%
Energy 8.72%
Financial 9.55%
Healthcare 22.41%
Services 15.55%
Technology 14.35%
Transportation 3.11%
Utilities 1.49%

1,739 Positions as of 06/30/2015

Company Class Value of Shares ($1,000s) ▼ Change in Value ($1,000s) Change (%) Shares Held
QLT INC COM 420 420 New 124,758
HI-CRUSH PARTNERS LP COM UNIT LTD 417 250 149.56 28,345
NXSTAGE MEDICAL INC COM 412 400 3,232.89 24,830
SUPERVALU INC COM 411 -475 (53.6) 50,845
AK STL HLDG CORP COM 411 84 25.76 141,603
REPLIGEN CORP COM 408 408 New 12,216
UNITED CONTL HLDGS INC COM 407 407 New 7,122
TRANSCANADA CORP COM 405 275 210.16 12,177
LIGAND PHARMACEUTICALS INC COM NEW 404 110 37.66 4,562
SONUS NETWORKS INC COM NEW 402 172 74.53 61,038
ARM HLDGS PLC SPONSORED ADR 402 402 New 9,747
POZEN INC COM 402 306 317.54 46,798
E HOUSE CHINA HLDGS LTD ADR 401 369 1,121.66 72,994
CALPINE CORP COM NEW 401 340 549.29 26,043
RESMED INC COM 399 399 New 7,856
TUNIU CORP SPONSORED ADS CL 389 373 2,347.06 32,448
ONCOTHYREON INC COM 389 328 538.46 117,388
RACKSPACE HOSTING INC COM 388 388 New 13,200
CALUMET SPECIALTY PRODS PTNRS UT LTD PARTNER 388 -154 (28.48) 15,316
DELEK LOGISTICS PARTNERS LP COM UNT RP INT 387 387 New 9,932