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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 (2015Q4)
Portfolio Summary: 4,723 holdings with a total value of $8,460,518,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 SMART TECHNOLOGIES INC 1 0 0.00%
2 SINOVAC BIOTECH LTD 9 0 0.00%
3 ZION OIL & GAS INC 100 0 0.00%
4 ALEXCO RESOURCE CORP 122 0 0.00%
5 STMICROELECTRONICS N V 52 0 0.00%
6 STRATA SKIN SCIENCES INC COM 1 0 0.00%
7 LEGACY RESVS LP 100 0 0.00% Call
8 RCS CAP CORP 100 0 0.00% Put
9 ASANKO GOLD INC 100 0 0.00% Call
10 AXT INC 100 0 0.00%
11 DRAGONWAVE INC 97 0 0.00%
12 CERAGON NETWORKS LTD 11 0 0.00%
13 COMMUNITY HEALTH SYS INC NEW 36,212 0 0.00%
14 CLEVELAND BIOLABS INC 114 0 0.00%
15 CDW CORP 10 0 0.00%
16 RTI SURGICAL INC 100 0 0.00% Call
17 NANOSPHERE INC 76 0 0.00%
18 REDIFF COM INDIA LTD 600 0 0.00% Call
19 AMYRIS INC 100 0 0.00% Put
20 CHINA XD PLASTICS CO LTD 100 0 0.00% Call
21 FAIRWAY GROUP HLDGS CORP 600 0 0.00% Put
22 Rubicon Technology 18 0 0.00%
23 UQM TECHNOLOGIES INC COM 52 0 0.00%
24 HANSEN MEDICAL INC 70 0 0.00%
25 LPATH INC 1,200 0 0.00%
26 ClubCorp Hldgs Inc 7 0 0.00%
27 EPIRUS BIOPHARMACEUTICALS IN 100 0 0.00% Call
28 BANCO SANTANDER BRASIL S A 100 0 0.00%
29 DENISON MINES CORP 141 0 0.00%
30 DRDGOLD LIMITED 100 0 0.00%
31 ASSEMBLY BIOSCIENCES INC 1 0 0.00%
32 CNINSURE INC 7 0 0.00%
33 NORTHERN DYNASTY MINERALS LTD COM 1,500 0 0.00%
34 GREAT PANTHER SILVER LTD 59 0 0.00%
35 AZURE MIDSTREAM PARTNERS LP 100 0 0.00% Put
36 ROYALE ENERGY INC 983 0 0.00%
37 RCS CAP CORP 500 0 0.00% Call
38 HMS Holding Corp 190 0 0.00%
39 FOREST CITY ENTERPRISES A 17 0 0.00%
40 DEX MEDIA INC NEW 100 0 0.00% Call
41 CINCINNATI BELL INC NEW 100 0 0.00% Call
42 Aerohive Networks, Inc. 75 0 0.00%
43 CURIS INC 100 0 0.00% Put
44 AMPLIFY SNACK BRANDS 100 1,000 0.00% Call
45 ODYSSEY MARINE EXPLORATION I 2,200 1,000 0.00% Call
46 FREDS INC-TENN CL A 34 1,000 0.00%
47 ALEXZA PHARMACEUTICALS INC 1,300 1,000 0.00% Call
48 RUBY TUESDAY INC 200 1,000 0.00% Call
49 FOUR CORNERS PPTY TR INC COM 55 1,000 0.00%
50 FORUM ENERGY TECHNOLOGIES IN 100 1,000 0.00% Call
Page 1 of 95

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-16-000018, filed 2016.02.11).

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.