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 1,820
New Positions 393
Increased Positions 767
Decreased Positions 1,009
Positions with Activity 1,776
Sold Out Positions 516
Total Mkt Value (in $ millions) 880

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

Sector Weighting

Basic Materials 4.88%
Capital Goods 1.91%
Conglomerates 0.81%
Consumer Cyclical 2.01%
Consumer/Non-Cyclical 2.27%
Energy 10.54%
Financial 8.61%
Healthcare 22.39%
Services 14.28%
Technology 12.85%
Transportation 2.55%
Utilities 3.1%

1,820 Positions as of 03/31/2015

Company Class Value of Shares ($1,000s) Change in Value ($1,000s) ▲ Change (%) Shares Held
AMERICAN AIRLS GROUP INC COM 33,730 -45,256 (57.3) 794,218
SIRIUS XM HLDGS INC COM -21,605 Sold Out 0
BLACKBERRY LTD COM 24,570 -12,455 (33.64) 2,392,403
ASTRAZENECA PLC SPONSORED ADR 1,078 -11,870 (91.68) 15,427
TWITTER INC COM 3,730 -10,961 (74.61) 101,687
JAZZ PHARMACEUTICALS PLC SHS USD 127 -10,094 (98.75) 705
TESLA MTRS INC COM 143 -8,838 (98.4) 584
OPKO HEALTH INC COM 2,000 -8,658 (81.23) 113,773
PENNEY J C INC COM 9,702 -8,013 (45.23) 1,097,493
SUNEDISON INC COM 1,301 -7,026 (84.37) 44,186
MBIA INC COM -6,957 Sold Out 0
WHITING PETE CORP NEW COM 793 -6,160 (88.59) 23,409
PHARMACYCLICS INC COM -6,142 Sold Out 0
INFOBLOX INC COM 236 -6,106 (96.28) 9,170
RITE AID CORP COM 9,299 -5,370 (36.61) 1,096,638
MEDTRONIC PLC SHS -4,987 Sold Out 0
ACTAVIS PLC SHS 37,300 -4,853 (11.51) 123,829
JIVE SOFTWARE INC COM 512 -4,788 (90.34) 88,580
CANADIAN PAC RY LTD COM 490 -4,245 (89.65) 2,772
ANGLOGOLD ASHANTI LTD SPONSORED ADR 3,188 -4,042 (55.91) 311,348