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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
51 MEETME INC 300 1,000 0.00% Put
52 CLEARSIGN COMBUSTION CORP 200 1,000 0.00% Call
53 GOLDEN STAR RES LTD CDA 4,011 1,000 0.00%
54 TRIANGLE PETE CORP 1,000 1,000 0.00% Call
55 SUPERCONDUCTOR TECHNOLOGIES 2,500 1,000 0.00% Call
56 ROSETTA GENOMICS LTD 901 1,000 0.00%
57 BIOSCRIP INC 700 1,000 0.00% Put
58 Nuverra Environmental Solutions Inc 1,569 1,000 0.00%
59 GOLDEN OCEAN GRP LTD 522 1,000 0.00%
60 FNB CORP PA 100 1,000 0.00%
61 APOLLO ED GROUP INC 100 1,000 0.00% Call
62 STAR BULK CARRIERS CORP 1,800 1,000 0.00% Put
63 DOCUMENT SEC SYS INC COM 4,883 1,000 0.00%
64 SINOVAC BIOTECH LTD 100 1,000 0.00% Call
65 NIMBLE STORAGE INC 100 1,000 0.00% Put
66 ENERGY RECOVERY INC 100 1,000 0.00% Put
67 AGILYSYS INC COM 100 1,000 0.00%
68 BRASKEM S A 100 1,000 0.00% Call
69 POLYCOM INC 102 1,000 0.00%
70 LANDEC CORP 100 1,000 0.00% Call
71 ATHERSYS INC 800 1,000 0.00% Put
72 W & T OFFSHORE INC 500 1,000 0.00% Put
73 BIODEL INC 3,600 1,000 0.00% Call
74 NETSOL TECHNOLOGIES INC 100 1,000 0.00% Call
75 ENERNOC INC 300 1,000 0.00% Put
76 CINCINNATI BELL INC NEW 300 1,000 0.00% Put
77 CHICOS FAS INC 100 1,000 0.00% Call
78 IDENTIV INC 300 1,000 0.00% Put
79 FLWS/1-800 FLOWERS 200 1,000 0.00% Call
80 DERMA SCIENCES ORD 209 1,000 0.00%
81 ACELRX PHARMACEUTICALS INC 200 1,000 0.00% Put
82 RUBY TUESDAY INC COM 183 1,000 0.00%
83 Rcs Capital Corp 1,751 1,000 0.00%
84 HUGOTON RTY TR TEX 400 1,000 0.00% Put
85 RMR GROUP INC 99 1,000 0.00%
86 SUPERCONDUCTOR TECHNOLOGIES 4,109 1,000 0.00%
87 ENZON PHARMACEUTICALS INC 798 1,000 0.00%
88 WAVE SYSTEMS CORP CL A NEW ADDED 918 1,000 0.00%
89 MOMENTA PHARMACEUTICALS INC 78 1,000 0.00%
90 BASIC ENERGY SVCS INC NEW 500 1,000 0.00% Put
91 MIDSTATES PETROLEUM CO INC 542 1,000 0.00%
92 CELESTICA INC 100 1,000 0.00% Put
93 ENZON PHARMACEUTICALS INC 1,200 1,000 0.00% Put
94 AMERICAN RAILCAR INDS INC 32 1,000 0.00%
95 Biocept Inc. (BIOC) 600 1,000 0.00%
96 DATAWATCH CORP 100 1,000 0.00% Put
97 TIMKENSTEEL CORP 100 1,000 0.00% Put
98 GERDAU S A 500 1,000 0.00% Put
99 Star Bulk Carriers Corp. 1,700 1,000 0.00%
100 SCICLONE PHARMACEUTICALS INC 100 1,000 0.00% Put
Page 2 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.