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) |
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 |
|---|---|---|---|---|---|
| PIONEER ENERGY SVCS CORP | COM | 5 | -16 | (77.42) | 662 |
| AVID TECHNOLOGY INC | COM | 5 | -15 | (76.31) | 692 |
| ALASKA COMMUNICATIONS SYS GRP | COM | 5 | 5 | New | 2,565 |
| PG&E CORP | COM | 5 | 5 | New | 100 |
| MERCK & CO INC NEW | COM | 5 | 5 | New | 100 |
| KANDI TECHNOLOGIES GROUP INC | COM | 5 | 5 | New | 1,232 |
| AKAMAI TECHNOLOGIES INC | COM | 5 | 5 | New | 100 |
| APARTMENT INVT & MGMT CO | CL A | 5 | 5 | New | 142 |
| SILVER WHEATON CORP | COM | 5 | -5 | (50) | 200 |
| MAXLINEAR INC | CL A | 5 | 2 | 75 | 700 |
| TELESTONE TECHNOLOGIES CORP | COM | 5 | 2 | 69.69 | 5,379 |
| INTEGRATED DEVICE TECHNOLOGY | COM | 4 | 4 | New | 562 |
| LIMELIGHT NETWORKS INC | COM | 4 | -13 | (75.14) | 2,167 |
| GENTEX CORP | COM | 4 | 4 | New | 177 |
| BP PLC | SPONSORED ADR | 4 | 4 | New | 100 |
| EXIDE TECHNOLOGIES | COM NEW | 4 | -1 | (22.49) | 5,171 |
| SIFY TECHNOLOGIES LIMITED | SPONSORED ADR | 4 | -10 | (69.87) | 2,172 |
| FIBRIA CELULOSE S A | SP ADR REP COM | 4 | 4 | New | 400 |
| DEXCOM INC | COM | 4 | 4 | New | 205 |
| VOLTARI CORP | COM NEW | 4 | -4 | (51.7) | 836 |
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