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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 (2016Q4)
Portfolio Summary: 4,408 holdings with a total value of $10,310,067,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 UQM TECHNOLOGIES INC COM 752 0 0.00%
2 ON DECK CAP INC 100 0 0.00% Put
3 NUTRI SYS INC NEW 3 0 0.00%
4 Senomyx Inc 1 0 0.00%
5 SOPHIRIS BIO INC 100 0 0.00% Call
6 ONCOCYTE CORP 26 0 0.00%
7 VISTA GOLD CORP 18 0 0.00%
8 PROGRESSIVE CORP OHIO 4 0 0.00%
9 CHANGYOU COM LTD 18 0 0.00%
10 RUBICON PROJ INC 62 0 0.00%
11 TERADATA CORP DEL 6 0 0.00%
12 CLEVELAND BIOLABS INC 68 0 0.00%
13 ENTEROMEDICS INCORPORATED COM PAR 17 0 0.00%
14 CELSION CORPORATION COM PAR 289 0 0.00%
15 CHINACACHE INTL HLDG LTD 100 0 0.00% Call
16 COMMUNITY HEALTH SYS INC NEW 36,212 0 0.00%
17 TANZANIAN ROYALTY EXPL CORP 300 0 0.00% Put
18 CAPITAL ONE FINL CORP 2 0 0.00%
19 CAPITAL PRODUCT PARTNERS L P 100 0 0.00% Put
20 DENISON MINES CORP 241 0 0.00%
21 STRATA SKIN SCIENCES INC 1 0 0.00%
22 Allegiant Travel Co 100 0 0.00% Call
23 Curis, Inc 27 0 0.00%
24 RENESOLA LTD 1 0 0.00%
25 MARIN SOFTWARE INC 2 0 0.00%
26 QUANTUM CORP COM DSSG 400 0 0.00%
27 EIGER BIOPHARMACEUTICALS INC 20 0 0.00%
28 ChinaCache International Holdi 109 0 0.00%
29 REAL GOODS SOLAR INC 147 0 0.00%
30 TOKAI PHARMACEUTICALS INC 100 0 0.00% Call
31 TENAX THERAPEUTICS INC 100 0 0.00% Call
32 WESTERN ASSET MTG CAP CORP 1 0 0.00%
33 INTELIQUENT ORD 5 0 0.00%
34 BANRO CORP 1,200 0 0.00%
35 RMR GROUP INC 2 0 0.00%
36 Rubicon Technology 18 0 0.00%
37 VECTOR GROUP LTD 3 0 0.00%
38 VIVINT SOLAR INC 500 1,000 0.00% Put
39 CLOUD PEAK ENERGY INC 200 1,000 0.00% Put
40 DIGI INTL INC COM 100 1,000 0.00%
41 AURIS MED HLDG AG 900 1,000 0.00% Put
42 SAFE BULKERS INC 1,000 1,000 0.00% Call
43 BLACKROCK CAPITAL INVESTMENT 100 1,000 0.00% Call
44 LEGACY RESVS LP 300 1,000 0.00% Call
45 ENDOCYTE INC 300 1,000 0.00% Put
46 SEADRILL PARTNERS LLC 240 1,000 0.00%
47 SCICLONE PHARMACEUTICALS INC 100 1,000 0.00% Call
48 GAIN CAP HLDGS INC 100 1,000 0.00%
49 COMMERCIAL VEH GROUP INC 100 1,000 0.00%
50 NATERA INC 100 1,000 0.00% Call
Page 1 of 89

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-17-000002, filed 2017.02.15).

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.