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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
51 RETAILMENOT INC 100 1,000 0.00% Call
52 ERIN ENERGY CORP 500 1,000 0.00% Call
53 GEVO INC 2,500 1,000 0.00% Put
54 FIBRIA CELULOSE S A 100 1,000 0.00% Call
55 INTERSECTIONS INC 500 1,000 0.00% Call
56 LIGHTINTHEBOX HLDG CO LTD SPONSORED ADR 305 1,000 0.00%
57 PARKER DRILLING COMPANY 240 1,000 0.00%
58 PRIMO WTR CORP 100 1,000 0.00% Call
59 MERRIMACK PHARMACEUTICALS IN 100 1,000 0.00% Call
60 KULICKE & SOFFA INDS INC 100 1,000 0.00% Call
61 PROTALIX BIOTHERAPEUTICS INC 1,500 1,000 0.00% Put
62 CALADRIUS BIOSCIENCES INC 186 1,000 0.00%
63 ACACIA RESH CORP 200 1,000 0.00% Call
64 COMMERCIAL VEH GROUP INC 100 1,000 0.00%
65 AGILYSYS INC COM 100 1,000 0.00%
66 ECOPETROL S A 100 1,000 0.00%
67 CELLCOM ISRAEL LTD 100 1,000 0.00% Call
68 FIRST BANCORP P R 200 1,000 0.00% Call
69 CLOUD PEAK ENERGY INC 200 1,000 0.00% Put
70 DIGI INTL INC COM 100 1,000 0.00%
71 QUINSTREET INC COM USD0.001 400 1,000 0.00%
72 REAL GOODS SOLAR INC 147 1,000 0.00%
73 TEGNA INC 66 1,000 0.00%
74 TRANSGLOBE ENERGY CORP 514 1,000 0.00%
75 PEARSON PLC 100 1,000 0.00% Put
76 SPARTAN MTRS INC 100 1,000 0.00% Put
77 GULF ISLAND FABRICATION INC 100 1,000 0.00% Put
78 JAKKS PACIFIC INC 104 1,000 0.00%
79 LG DISPLAY CO LTD 100 1,000 0.00% Put
80 AVINGER INC 200 1,000 0.00% Call
81 VIOLIN MEMORY INC 1,800 1,000 0.00% Call
82 VIVINT SOLAR INC 300 1,000 0.00%
83 METABOLIX INC 2,752 1,000 0.00%
84 LIVEPERSON INC 142 1,000 0.00%
85 Mercer International 142 1,000 0.00%
86 CHINA AUTOMOTIVE SYS INC 140 1,000 0.00%
87 DELCATH SYS INC 257 1,000 0.00%
88 MV OIL TR 200 1,000 0.00% Call
89 CYTRX CORP 1,500 1,000 0.00% Put
90 CARA THERAPEUTICS INC 100 1,000 0.00% Put
91 SUNRUN INC 200 1,000 0.00% Call
92 GENER8 MARITIME INC 200 1,000 0.00% Call
93 AVIANCA HLDGS SA 200 1,000 0.00% Put
94 ACURA PHARMACEUTICALS INC 807 1,000 0.00%
95 ORASURE TECHNOLOGIES INC 100 1,000 0.00% Put
96 HARVEST NATURAL RESOURCES IN 1,652 1,000 0.00%
97 FORM HLDGS CORP 200 1,000 0.00% Call
98 CHROMADEX CORP 200 1,000 0.00%
99 TELIGENT INC NEW 100 1,000 0.00% Call
100 HUDSON TECHNOLOGIES INC 100 1,000 0.00% Call
Page 2 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.