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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 (2014Q4)
Original 13F HR (0000932540-15-000002) filed in 2015.02.11
#
Name
Shares
Value ($)
%
Options
Notes
1 VISTA GOLD CORP 825 0 0.00%
2 GAFISA S A 200 0 0.00% Call
3 EXETER RES CORP 500 0 0.00%
4 EXETER RES CORP 500 0 0.00% Put
5 A10 NETWORKS INC 100 0 0.00% Call
6 MCCLATCHY CO 46 0 0.00%
7 ENDEAVOUR INTL CORP COM NEW 24,286 0 0.00%
8 IMMUNOCELLULAR THERAPEUTICS 300 0 0.00% Put
9 HUTCHINSON TECHNOLOGY INC 100 0 0.00% Put
10 FULL CIRCLE CAP CORP 100 0 0.00% Put
11 MAST THERAPEUTICS INC 253 0 0.00%
12 BSD MED CORP 100 0 0.00%
13 ALEXCO RESOURCE CORP 700 0 0.00% Put
14 AMERICAN EAGLE ENERGY CORP 300 0 0.00% Call
15 GULF RESOURCES INC 100 0 0.00% Call
16 ASCENT SOLAR TECHNOLOGIES IN 200 0 0.00% Call
17 GRIFOLS S A SP ADR REP B 7 0 0.00%
18 ASSEMBLY BIOSCIENCES INC 62 0 0.00%
19 COMPUTER PROGRAMS & SYS INC COM 5 0 0.00%
20 UQM TECHNOLOGIES INC 100 0 0.00% Put
21 WET SEAL INC 4,500 0 0.00% Put
22 HANSEN MEDICAL INC 700 0 0.00%
23 AMERIPRISE FINANCIAL, INC. 8 0 0.00%
24 MULTIMEDIA GAMES HLDG CO INC 150,500 0 0.00% Put
25 MULTIMEDIA GAMES HLDG CO INC 20,200 0 0.00% Call
26 RIGEL PHARMACEUTICALS INC 46 0 0.00%
27 NATIONAL RETAIL PPTYS INC 4 0 0.00%
28 ENZON PHARMACEUTICALS INC 100 0 0.00% Put
29 OXIGENE INC 100 0 0.00% Call
30 Corinthian Colleges, Inc. 271 0 0.00%
31 SEVENTY SEVEN ENERGY INC - escrow shares 76 0 0.00%
32 ENZON PHARMACEUTICALS INC 400 0 0.00% Call
33 REVOLUTION LIGHTING TECHNOLOGI 200 0 0.00% Put
34 KEMET CORP 100 0 0.00% Call
35 PIKE CORP 10,000 0 0.00% Put
36 ACURA PHARMACEUTICALS INC 876 0 0.00%
37 DELCATH SYS INC COM NEW 33 0 0.00%
38 Ply Gem Hldgs Inc 30 0 0.00%
39 Quest Rare Minerals Ltd. 300 0 0.00%
40 SUNGY MOBILE LTD 100 0 0.00% Call
41 RHINO RESOURCE PARTNERS LP 100 0 0.00% Put
42 CHINA MING YANG WIND PWR GRO 100 0 0.00% Put
43 CYTORI THERAPEUTICS INC 300 0 0.00% Put
44 ENTROPIC COMMUNICA 55 0 0.00%
45 OPLINK COMMUNICATIONS INC 25,800 0 0.00% Call
46 BELLATRIX EXPLORATION LTD 100 0 0.00% Put
47 CLEARFIELD INC 100 1 0.00% Call
48 CLEVELAND BIOLABS INC 3,476 1 0.00%
49 FEMALE HEALTH CO 300 1 0.00% Put
50 ZAZA ENERGY CORP 500 1 0.00% Put
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