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Institutional Investment Manager
GROUP ONE TRADING LLC
GROUP ONE TRADING LLC (CIK: 0000932540) incorporated in Delaware, located at 425 S Financial Place, Chicago, IL. Institutional holdings reported to the SEC.

Institutional Holdings (2015Q1)
Portfolio Summary: 4,755 holdings with a total value of $6,369,518,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 WARREN RES INC 400 0 0.00% Call
2 MITCHAM INDS INC 100 0 0.00% Call
3 MARATHON OIL CORP 9 0 0.00%
4 DRAGONWAVE INC 119 0 0.00%
5 KEMET CORP 100 0 0.00% Call
6 DEX MEDIA INC NEW 100 0 0.00% Call
7 WEST MARINE INC COM 50 0 0.00%
8 ROSETTA GENOMICS LTD 100 0 0.00% Call
9 GREAT PANTHER SILVER LTD 59 0 0.00%
10 GOLDEN STAR RES LTD CDA 1,911 0 0.00%
11 ACTINIUM PHARMACEUTICALS INC 200 0 0.00% Call
12 XINYUAN REAL ESTATE CO LTD 100 0 0.00% Call
13 BENEFICIAL BANCORP INC 13 0 0.00%
14 WET SEAL INC 29,590 0 0.00%
15 OCI PARTNERS LP 26 0 0.00%
16 SANDSTORM GOLD LTD 100 0 0.00%
17 ONCOLYTICS BIOTECH INC 200 0 0.00% Put
18 CANCER GENETICS 1 0 0.00%
19 SMART TECHNOLOGIES INC 1 0 0.00%
20 PARAGON OFFSHORE PLC 200 0 0.00% Put
21 ALEXCO RESOURCE CORP 22 0 0.00%
22 PHOTRONICS INC 57 0 0.00%
23 QUICKSILVER RESOURCES INC 1,000 0 0.00% Put
24 MATTSON TECHNOLOGY INC 100 0 0.00% Put
25 FEMALE HEALTH CO 100 0 0.00%
26 E2OPEN INC 64 0 0.00%
27 BPZ RESOURCES INC 778 0 0.00%
28 ROYALE ENERGY INC 81 0 0.00%
29 KEMET CORP COM NEW 74 0 0.00%
30 VERSO CORP 100 0 0.00% Put
31 LG DISPLAY CO LTD 25 0 0.00%
32 ROCK CREEK PHARMACEUTICALS I 4,000 0 0.00% Put
33 TOWERSTREAM CORP 135 0 0.00%
34 BALTIC TRADING LIMITED 200 0 0.00% Call
35 IMMUNOCELLULAR THERAPEUTICS 300 0 0.00% Put
36 FIBROCELL SCIENCE INC 100 0 0.00% Call
37 MCCLATCHY CO 200 0 0.00% Call
38 SUNGY MOBILE LTD 100 0 0.00% Call
39 URANIUM RES INC 300 0 0.00% Call
40 TANZANIAN ROYALTY EXPL CORP 100 0 0.00% Put
41 Corinthian Colleges, Inc. 271 0 0.00%
42 STRATA SKIN SCIENCES INC COM 1 0 0.00%
43 Beneficial Bancorp, Inc. 13 0 0.00%
44 CTC Media, Inc. 182 1,000 0.00%
45 SERVICESOURCE INTL INC 400 1,000 0.00% Call
46 ALMADEN MINERALS LTD 1,203 1,000 0.00%
47 CHECKPOINT SYS INC 100 1,000 0.00% Put
48 ASSEMBLY BIOSCIENCES INC 62 1,000 0.00%
49 EXTREME NETWORKS INC 300 1,000 0.00% Call
50 HUNTINGTON BANCSHARES INC 100 1,000 0.00% Put
Page 1 of 96

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-15-000007, filed 2015.05.14).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.