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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 (2016Q3)
Portfolio Summary: 4,531 holdings with a total value of $9,214,013,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 PHOTOMEDEX INC 280 0 0.00%
2 PROTALIX BIOTHERAPEUTICS INC 366 0 0.00%
3 REX ENERGY CORPORATION 300 0 0.00% Put
4 STRATA SKIN SCIENCES INC 1 0 0.00%
5 MOTORCAR PTS AMER INC 12 0 0.00%
6 REALNETWORKS INC 100 0 0.00% Call
7 TANZANIAN ROYALTY EXPL CORP 300 0 0.00% Put
8 PEREGRINE PHARMACEUTICALS IN 700 0 0.00% Call
9 DENISON MINES CORP 241 0 0.00%
10 ENTEROMEDICS INC 1,328 0 0.00%
11 QUANTUM CORP 600 0 0.00% Call
12 CELSION CORPORATION COM PAR 289 0 0.00%
13 CLEVELAND BIOLABS INC 68 0 0.00%
14 VISTA GOLD CORP 200 0 0.00% Put
15 Rubicon Technology 18 0 0.00%
16 AMC NETWORKS INC CL A 6 0 0.00%
17 TETRALOGIC PHARMA CO 3,000 0 0.00%
18 VERASTEM INC 66 0 0.00%
19 GOLDEN OCEAN GROUP LTD 104 0 0.00%
20 ONCOCYTE CORP 51 0 0.00%
21 ImmunoCellular Therapeutics Lt 700 0 0.00%
22 ELEVEN BIOTHERAPEUTICS INC 100 0 0.00% Call
23 AURIS MED HLDG AG 100 0 0.00% Put
24 ARMSTRONG WORLD INDS INC NEW COM 2 0 0.00%
25 BANRO CORP 1,200 0 0.00%
26 URANIUM RES INC 8 0 0.00%
27 OOMA INC 50 0 0.00%
28 ChinaCache International Holdi 109 0 0.00%
29 EIGER BIOPHARMACEUTICALS INC 20 0 0.00%
30 UQM TECHNOLOGIES INC COM 752 0 0.00%
31 NEWCASTLE INVT CORP NEW 100 0 0.00% Put
32 HONGLI CLEAN ENERGY TECHNOLO 1,327 0 0.00%
33 ADCARE HEALTH SYSTEMS INC 58 0 0.00%
34 RMR GROUP INC 2 0 0.00%
35 URANIUM RES INC 100 0 0.00% Put
36 GTX INC 354 0 0.00%
37 MONSTER WORLDWIDE INC 100 0 0.00% Put
38 CYTOSORBENTS CORP 100 1,000 0.00% Call
39 NEURALSTEM INC COM 4,349 1,000 0.00%
40 TRINITY BIOTECH PLC 100 1,000 0.00%
41 DRYSHIPS INC 2,727 1,000 0.00%
42 STERLING CONSTRUCTION CO INC 133 1,000 0.00%
43 WILLBROS GROUP INC DEL 300 1,000 0.00% Call
44 ARCHROCK INC 100 1,000 0.00% Put
45 PACIFIC DRILLING SA LUXEMBOU 128 1,000 0.00%
46 New York REIT Inc 100 1,000 0.00%
47 PAPA MURPHYS HLDGS INC 200 1,000 0.00% Call
48 HARRIS & HARRIS GROUP INC 1,069 1,000 0.00%
49 CHINA UNICOM (HONG KONG) LTD 100 1,000 0.00% Call
50 NEW MEDIA INVT GROUP INC COM 75 1,000 0.00%
Page 1 of 91

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-16-000025, filed 2016.11.14).

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.