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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 (2016Q1)
Original 13F HR (0000932540-16-000021) filed in 2016.05.12
#
Name
Shares
Value ($)
%
Options
Notes
51 TRINITY BIOTECH PLC 100 1 0.00%
52 INOTEK PHARMACEUTICALS CORP 100 1 0.00% Put
53 INFOBLOX INC 42 1 0.00%
54 SCORPIO TANKERS INC 200 1 0.00% Call
55 QUINSTREET INC COM USD0.001 400 1 0.00%
56 RESEARCH FRONTIERS INC 218 1 0.00%
57 ELEVEN BIOTHERAPEUTICS INC 2,400 1 0.00%
58 OCEAN RIG UDW INC F 1,500 1 0.00% Call
59 SKY-MOBI LTD 500 1 0.00% Call
60 GSV CAP CORP 200 1 0.00% Put
61 CALAMOS ASSET MANAGEMENT CL A ORD 86 1 0.00%
62 Caladrius Biosciences Inc 1,856 1 0.00%
63 ENERGOUS CORP 100 1 0.00% Put
64 RTI SURGICAL INC 200 1 0.00% Call
65 VRINGO INC 500 1 0.00% Call
66 GERDAU S A 500 1 0.00% Put
67 K12 INC 100 1 0.00%
68 FORTUNA SILVER MINES INC 300 1 0.00% Call
69 RADNET INC COM 295 1 0.00%
70 UNITED ONLINE INC 124 1 0.00%
71 UNITED DEV FDG IV 200 1 0.00% Put
72 CHINA AUTOMOTIVE SYS INC 140 1 0.00%
73 Mercer International 142 1 0.00%
74 SPECTRUM PHARMACEUTICALS INC 200 1 0.00% Put
75 REVOLUTION LIGHTING TECHNOLOGI COM NEW 96 1 0.00%
76 AZENTA INC COM 120 1 0.00%
77 INTERNAP CORP 400 1 0.00% Call
78 UNIQURE NV 100 1 0.00% Call
79 ENERPLUS CORP 300 1 0.00% Put
80 KAPSTONE PAPER & PACKAGING C 100 1 0.00% Call
81 AGENUS INC 200 1 0.00% Put
82 AGILYSYS INC COM 100 1 0.00%
83 MICROVISION INC DEL 600 1 0.00% Put
84 BONANZA CREEK ENERGY INC 600 1 0.00% Call
85 CLOUD PEAK ENERGY INC 500 1 0.00% Put
86 RING ENERGY INC COM 100 1 0.00%
87 PFENEX INC COM 100 1 0.00%
88 HUGOTON RTY TR TEX 400 1 0.00% Put
89 RENESOLA LTD 576 1 0.00%
90 XENOPORT INC 200 1 0.00% Call
91 LSB INDS INC 100 1 0.00% Put
92 SEVENTY SEVEN ENERGY INC - escrow shares 1,786 1 0.00%
93 ENTEROMEDICS INC 1,328 1 0.00%
94 DORCHESTER MINERALS LP 100 1 0.00% Call
95 SERVICESOURCE INTL INC 200 1 0.00% Call
96 TETRALOGIC PHARMA CO 3,000 1 0.00%
97 MOMENTA PHARMACEUTICALS INC 78 1 0.00%
98 MOMENTA PHARMACEUTICALS INC 100 1 0.00% Call
99 OREXIGEN THERAPEUTICS INC 1,900 1 0.00% Put
100 STMICROELECTRONICS N V 100 1 0.00% Call
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