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) |
520 |
Sector Weighting
| Basic Materials | 6.24% |
| Capital Goods | 1.93% |
| Conglomerates | 0.68% |
| Consumer Cyclical | 2.43% |
| Consumer/Non-Cyclical | 5.06% |
| Energy | 12.92% |
| Financial | 12.56% |
| Healthcare | 10.91% |
| Services | 28.56% |
| Technology | 16.05% |
| Transportation | 1.26% |
| Utilities | 0.94% |
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 |
|---|---|---|---|---|---|
| MCGRAW HILL FINL INC | COM | -60 | Sold Out | 0 | |
| 21VIANET GROUP INC | SPONSORED ADR | -3 | Sold Out | 0 | |
| ABBVIE INC | COM | -9 | Sold Out | 0 | |
| ABIOMED INC | COM | -45 | Sold Out | 0 | |
| ABRAXAS PETE CORP | COM | -87 | Sold Out | 0 | |
| ACETO CORP | COM | -11 | Sold Out | 0 | |
| ACURA PHARMACEUTICALS INC | COM NEW | -9 | Sold Out | 0 | |
| ADVANCE AUTO PARTS INC | COM | -1,043 | Sold Out | 0 | |
| ADVENT SOFTWARE INC | COM | -86 | Sold Out | 0 | |
| AFFYMAX INC | COM | -96 | Sold Out | 0 | |
| AIRGAS INC | COM | -54 | Sold Out | 0 | |
| ALBEMARLE CORP | COM | -21 | Sold Out | 0 | |
| ALLSCRIPTS HEALTHCARE SOLUTNS | COM | -655 | Sold Out | 0 | |
| ALNYLAM PHARMACEUTICALS INC | COM | -74 | Sold Out | 0 | |
| ALON USA ENERGY INC | COM | -21 | Sold Out | 0 | |
| ALTISOURCE RESIDENTIAL CORP | CL B | -39 | Sold Out | 0 | |
| AMDOCS LTD | ORD | -4 | Sold Out | 0 | |
| AMERICAN AXLE & MFG HLDGS INC | COM | -104 | Sold Out | 0 | |
| AMERICAN EAGLE OUTFITTERS NEW | COM | -137 | Sold Out | 0 | |
| AMERISOURCEBERGEN CORP | COM | -13 | Sold Out | 0 |
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