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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 (2017Q1)
Portfolio Summary: 4,605 holdings with a total value of $8,588,972,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 COLONY STARWOOD HOMES 3 0 0.00%
2 MARIN SOFTWARE INC 2 0 0.00%
3 ION GEOPHYSICAL CORP 100 0 0.00% Put
4 ADEPTUS HEALTH INC 100 0 0.00% Call
5 CELSION CORPORATION 100 0 0.00% Put
6 DENISON MINES CORP 241 0 0.00%
7 CHINACACHE INTL HLDG LTD 100 0 0.00% Call
8 RENTECH INC 200 0 0.00% Put
9 RMR GROUP INC 2 0 0.00%
10 REALNETWORKS INC 100 0 0.00%
11 SEQUENTIAL BRNDS GROUP INC N 100 0 0.00% Call
12 CYS INVTS INC COM 4 0 0.00%
13 CELSION CORPORATION COM PAR 289 0 0.00%
14 EIGER BIOPHARMACEUTICALS INC 7 0 0.00%
15 QUANTUM CORP COM DSSG 342 0 0.00%
16 CLEVELAND BIOLABS INC 68 0 0.00%
17 Allegiant Travel Co 100 0 0.00% Call
18 CHINA AUTOMOTIVE SYS INC 40 0 0.00%
19 INDIA FD INC 1 0 0.00%
20 UNILIFE CORP NEW 94 0 0.00%
21 REALNETWORKS INC 100 0 0.00% Call
22 DRAGONWAVE INC 199 0 0.00%
23 DRYSHIPS INC 97 0 0.00%
24 ONCOCYTE CORP 26 0 0.00%
25 STRATA SKIN SCIENCES INC 1 0 0.00%
26 AMBEV SA 78 0 0.00%
27 COMMUNITY HEALTH SYS INC NEW 36,212 0 0.00%
28 REX ENERGY CORPORATION 754 0 0.00%
29 VISTA GOLD CORP 18 0 0.00%
30 JUST ENERGY GROUP INC 2,400 0 0.00% Call
31 PACIFIC DRILLING SA LUXEMBOU 128 0 0.00%
32 ChinaCache International Holdi 109 0 0.00%
33 Sunesis Pharmaceuticals, Inc. 26 0 0.00%
34 DERMIRA INC COM 1 0 0.00%
35 REAL GOODS SOLAR INC 5 0 0.00%
36 MITEK SYS INC 32 0 0.00%
37 RYERSON HLDG CORP COM 30 0 0.00%
38 Senomyx Inc 1 0 0.00%
39 ISLE OF CAPRI CASINOS INC COM 1 0 0.00%
40 COMPANHIA SIDERURGICA NACION 100 0 0.00% Put
41 KINDER MORGAN INCORPORATED DEL WARRANT EXP 052517 161,973 0 0.00%
42 VOXELJET AG 174 0 0.00%
43 Rubicon Technology 18 0 0.00%
44 CHART INDS INC 27 1,000 0.00%
45 CNH INDL N V 100 1,000 0.00% Call
46 KOPIN CORP 300 1,000 0.00% Call
47 TETRA TECHNOLOGIES INC DEL COM 300 1,000 0.00%
48 TENAX THERAPEUTICS INC 1,300 1,000 0.00% Call
49 BLACKROCK CAPITAL INVESTMENT 100 1,000 0.00% Put
50 ENTEROMEDICS INCORPORATED COM PAR 186 1,000 0.00%
Page 1 of 93

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-17-000004, filed 2017.05.10).

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.