GROUP ONE TRADING, L.P. Information

440 S. LASALLE STREET, CHICAGO, Illinois, 60605, (312) 431-2841

Report Date: 03/31/2013

Position Statistics:

Total Positions 1,742
New Positions 452
Increased Positions 914
Decreased Positions 808
Positions with Activity 1,722
Sold Out Positions 434
Total Mkt Value
(in $ millions)
519

Sector Weighting

Basic Materials 6.26%
Capital Goods 1.93%
Conglomerates 0.68%
Consumer Cyclical 2.46%
Consumer/Non-Cyclical 5.01%
Energy 13.01%
Financial 12.7%
Healthcare 10.69%
Services 28.67%
Technology 15.92%
Transportation 1.26%
Utilities 0.96%

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

1,742 Positions as of 03/31/2013

Company Class Value of Shares ($1,000s) Change in Value ($1,000s) Change (%) Shares Held
FOCUS MEDIA HLDG LTD SPONSORED ADR 50,938 28,884 130.97 1,857,702
DELL INC COM 12,209 12,146 19,379.03 913,177
CONSTELLATION BRANDS INC CL A 10,875 4,703 76.18 211,169
NEWS CORP CL A 9,259 9,259 New 278,717
NEWFIELD EXPL CO COM 8,874 8,844 29,986.30 360,133
ARBITRON INC COM 8,518 7,947 1,390.68 182,087
OCWEN FINL CORP COM NEW 8,211 8,211 New 197,377
VODAFONE GROUP PLC NEW SPONS ADR NEW 7,928 7,355 1,283.12 270,316
NATIONSTAR MTG HLDGS INC COM 7,245 4,166 135.33 168,603
NOKIA CORP SPONSORED ADR 7,068 6,660 1,630.68 1,941,861
PLAINS EXPL& PRODTN CO COM 5,575 5,085 1,038.14 113,859
JIVE SOFTWARE INC COM 5,308 5,273 14,918.51 335,964
ZHONGPIN INC COM 5,089 2,151 73.19 392,661
AMERICAN CAP LTD COM 4,923 3,650 286.54 346,223
GENWORTH FINL INC COM CL A 4,784 2,951 160.95 456,512
MBIA INC COM 4,759 3,203 205.90 325,487
COBALT INTL ENERGY INC COM 4,663 3,550 318.84 174,263
RADIAN GROUP INC COM 4,396 2,064 88.55 331,265
NORTHERN TIER ENERGY LP COM UN REPR PART 4,295 4,295 New 170,443
MICHAEL KORS HLDGS LTD SHS 4,208 973 30.07 69,600

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