Dark
Light
System
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 SANDSTORM GOLD LTD 100 0 0.00%
2 XINYUAN REAL ESTATE CO LTD 100 0 0.00% Call
3 WET SEAL INC 29,590 0 0.00%
4 CANCER GENETICS 1 0 0.00%
5 VERSO CORP 100 0 0.00% Put
6 MATTSON TECHNOLOGY INC 100 0 0.00% Put
7 Corinthian Colleges, Inc. 271 0 0.00%
8 FEMALE HEALTH CO 100 0 0.00%
9 ROSETTA GENOMICS LTD 100 0 0.00% Call
10 KEMET CORP COM NEW 74 0 0.00%
11 DRAGONWAVE INC 119 0 0.00%
12 SUNGY MOBILE LTD 100 0 0.00% Call
13 ROCK CREEK PHARMACEUTICALS I 4,000 0 0.00% Put
14 ROYALE ENERGY INC 81 0 0.00%
15 KEMET CORP 100 0 0.00% Call
16 STRATA SKIN SCIENCES INC COM 1 0 0.00%
17 E2OPEN INC 64 0 0.00%
18 TANZANIAN ROYALTY EXPL CORP 100 0 0.00% Put
19 Beneficial Bancorp, Inc. 13 0 0.00%
20 DEX MEDIA INC NEW 100 0 0.00% Call
21 URANIUM RES INC 300 0 0.00% Call
22 MITCHAM INDS INC 100 0 0.00% Call
23 PHOTRONICS INC 57 0 0.00%
24 MARATHON OIL CORP 9 0 0.00%
25 WARREN RES INC 400 0 0.00% Call
26 ACTINIUM PHARMACEUTICALS INC 200 0 0.00% Call
27 ONCOLYTICS BIOTECH INC 200 0 0.00% Put
28 IMMUNOCELLULAR THERAPEUTICS 300 0 0.00% Put
29 WEST MARINE INC COM 50 0 0.00%
30 SMART TECHNOLOGIES INC 1 0 0.00%
31 BALTIC TRADING LIMITED 200 0 0.00% Call
32 GREAT PANTHER SILVER LTD 59 0 0.00%
33 BENEFICIAL BANCORP INC 13 0 0.00%
34 GOLDEN STAR RES LTD CDA 1,911 0 0.00%
35 ALEXCO RESOURCE CORP 22 0 0.00%
36 LG DISPLAY CO LTD 25 0 0.00%
37 OCI PARTNERS LP 26 0 0.00%
38 PARAGON OFFSHORE PLC 200 0 0.00% Put
39 TOWERSTREAM CORP 135 0 0.00%
40 FIBROCELL SCIENCE INC 100 0 0.00% Call
41 QUICKSILVER RESOURCES INC 1,000 0 0.00% Put
42 MCCLATCHY CO 200 0 0.00% Call
43 BPZ RESOURCES INC 778 0 0.00%
44 AMYRIS INC COM 621 1,000 0.00%
45 PLANAR SYS INC 100 1,000 0.00% Put
46 ULTRA CLEAN HLDGS INC 100 1,000 0.00%
47 WHITING USA TR I TR UNIT 13,692 1,000 0.00%
48 MATTSON TECHNOLOGY INC 200 1,000 0.00% Call
49 CERAGON NETWORKS LTD 711 1,000 0.00%
50 DOT HILL SYS CORP 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.