GROUP ONE TRADING, L.P.
440 S. LASALLE STREET, CHICAGO, Illinois, 60605, (312) 431-2841
Report Date: 03/31/2013
Position Statistics:
| Total Positions | 1,732 |
| New Positions | 449 |
| Increased Positions | 906 |
| Decreased Positions | 806 |
| Positions with Activity | 1,712 |
| Sold Out Positions | 433 |
| Total Mkt Value (in $ millions) |
468 |
Sector Weighting
| Basic Materials | 7.86% |
| Capital Goods | 2.18% |
| Conglomerates | 0.75% |
| Consumer Cyclical | 2.76% |
| Consumer/Non-Cyclical | 5.55% |
| Energy | 12.85% |
| Financial | 14.22% |
| Healthcare | 12.34% |
| Services | 20.45% |
| Technology | 18.15% |
| Transportation | 1.4% |
| Utilities | 1.02% |
Institutional Holdings information is filed by major institutions on form 13-F with the Securities and Exchange Commission.
906 INCREASED Positions as of 03/31/2013
| Company | Class | Value of Shares ($1,000s) |
Change in Value ($1,000s) | Change (%) | Shares Held |
|---|---|---|---|---|---|
| DELL INC | COM | 12,310 | 12,246 | 19,379.03 | 913,177 |
| CONSTELLATION BRANDS INC | CL A | 11,105 | 4,802 | 76.18 | 211,169 |
| OCWEN FINL CORP | COM NEW | 8,906 | 8,906 | New | 197,377 |
| NEWS CORP | CL A | 8,796 | 8,796 | New | 278,717 |
| NEWFIELD EXPL CO | COM | 8,622 | 8,593 | 29,986.30 | 360,133 |
| ARBITRON INC | COM | 8,531 | 7,959 | 1,390.68 | 182,087 |
| VODAFONE GROUP PLC NEW | SPONS ADR NEW | 7,761 | 7,200 | 1,283.12 | 270,316 |
| NOKIA CORP | SPONSORED ADR | 7,496 | 7,062 | 1,630.68 | 1,941,861 |
| NATIONSTAR MTG HLDGS INC | COM | 7,270 | 4,181 | 135.33 | 168,603 |
| JIVE SOFTWARE INC | COM | 5,826 | 5,787 | 14,918.51 | 335,964 |
| FREEPORT-MCMORAN COPPER & GOLD | COM | 5,420 | 3,902 | 257.02 | 183,608 |
| ZHONGPIN INC | COM | 5,246 | 2,217 | 73.19 | 392,661 |
| GENWORTH FINL INC | COM CL A | 5,200 | 3,207 | 160.95 | 456,512 |
| ACADIA PHARMACEUTICALS | COM | 4,866 | 2,611 | 115.80 | 264,028 |
| COBALT INTL ENERGY INC | COM | 4,642 | 3,534 | 318.84 | 174,263 |
| AEGERION PHARMACEUTICALS INC | COM | 4,575 | 1,424 | 45.18 | 71,817 |
| AMERICAN CAP LTD | COM | 4,574 | 3,390 | 286.54 | 346,223 |
| MBIA INC | COM | 4,482 | 3,017 | 205.90 | 325,487 |
| NORTHERN TIER ENERGY LP | COM UN REPR PART | 4,375 | 4,375 | New | 170,443 |
| MICHAEL KORS HLDGS LTD | SHS | 4,289 | 992 | 30.07 | 69,600 |
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