GROUP ONE TRADING, L.P.
440 S. LASALLE STREET, CHICAGO, Illinois, 60605, (312) 431-2841
Report Date: 03/31/2013
Position Statistics:
| Total Positions | 1,742 |
| New Positions | 452 |
| Increased Positions | 914 |
| Decreased Positions | 808 |
| Positions with Activity | 1,722 |
| Sold Out Positions | 434 |
| Total Mkt Value (in $ millions) |
527 |
Sector Weighting
| Basic Materials | 6.22% |
| Capital Goods | 1.93% |
| Conglomerates | 0.68% |
| Consumer Cyclical | 2.48% |
| Consumer/Non-Cyclical | 4.97% |
| Energy | 13% |
| Financial | 12.85% |
| Healthcare | 10.66% |
| Services | 28.55% |
| Technology | 16.01% |
| Transportation | 1.27% |
| Utilities | 0.95% |
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 |
|---|---|---|---|---|---|
| ROYAL BK SCOTLAND GROUP PLC | SPONS ADR 20 ORD | -35 | Sold Out | 0 | |
| RPC INC | COM | -106 | Sold Out | 0 | |
| RPM INTL INC | COM | -20 | Sold Out | 0 | |
| SALIX PHARMACEUTICALS INC | COM | -81 | Sold Out | 0 | |
| SALLY BEAUTY HLDGS INC | COM | -64 | Sold Out | 0 | |
| SAN JUAN BASIN RTY TR | UNIT BEN INT | -82 | Sold Out | 0 | |
| SANCHEZ ENERGY CORP | COM | -628 | Sold Out | 0 | |
| SANDRIDGE ENERGY INC | COM | -50 | Sold Out | 0 | |
| SANMINA CORPORATION | COM | -40 | Sold Out | 0 | |
| SCHNITZER STL INDS | CL A | -15 | Sold Out | 0 | |
| SCHULMAN A INC | COM | -3 | Sold Out | 0 | |
| SCHWEITZER-MAUDUIT INTL INC | COM | -18 | Sold Out | 0 | |
| SEALED AIR CORP NEW | COM | -869 | Sold Out | 0 | |
| SEASPAN CORP | SHS | -90 | Sold Out | 0 | |
| SEATTLE GENETICS INC | COM | -357 | Sold Out | 0 | |
| SHUTTERFLY INC | COM | -128 | Sold Out | 0 | |
| SILICON GRAPHICS INTL CORP | COM | -24 | Sold Out | 0 | |
| SINOCOKING COAL & COKE CH INDS | COM | -138 | Sold Out | 0 | |
| SIX FLAGS ENTMT CORP NEW | COM | -296 | Sold Out | 0 | |
| SMTC CORP | COM NEW | Sold Out | 0 |
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