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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
101 AEGEAN MARINE PETROLEUM NETW 2,400 18 0.00% Put
102 AEGERION PHARMACEUTICALS INC 6,000 22 0.00% Put
103 AEGERION PHARMACEUTICALS INC 15,100 56 0.00% Call
104 AERCAP HOLDINGS NV 80,600 3,124 0.04% Call
105 AERCAP HOLDINGS NV 115,400 4,473 0.06% Put
106 AERCAP HOLDINGS NV 67,315 2,609 0.04%
107 AERIE PHARMACEUTICALS INC 1,000 12 0.00% Put
108 AERIE PHARMACEUTICALS INC 30,000 365 0.01% Call
109 AEROPOSTALE 103,000 20 0.00% Put
110 AEROPOSTALE 4,955,300 984 0.01% Call
111 AEROVIRONMENT INC 2,900 82 0.00% Put
112 AEROVIRONMENT INC 1,900 54 0.00% Call
113 AES CORP 16,300 192 0.00% Call
114 AETNA INC NEW 34,500 3,876 0.05% Call
115 AETNA INC NEW 7,483 841 0.01%
116 AFFYMETRIX INC 59,800 838 0.01% Put
117 AFFYMETRIX INC 84,300 1,181 0.02% Call
118 AFLAC INC 1,900 120 0.00% Put
119 AFLAC INC 25,000 1,579 0.02% Call
120 AG MTG INVT TR INC 5,000 65 0.00% Put
121 AG MTG INVT TR INC 2,243 29 0.00%
122 AGCO CORP 9,000 447 0.01% Put
123 AGCO CORP 500 25 0.00% Call
124 AGCO Corp 2,300 114 0.00%
125 AGENUS INC 200 1 0.00% Put
126 AGENUS INC 46,700 194 0.00% Call
127 AGILENT TECHNOLOGIES INC 21,500 857 0.01% Call
128 AGILENT TECHNOLOGIES INC 3,418 136 0.00%
129 AGILYSYS INC COM 100 1 0.00%
130 AGIOS PHARMACEUTICALS INC 19,800 804 0.01% Put
131 AGIOS PHARMACEUTICALS INC 25,900 1,052 0.01% Call
132 AGIOS PHARMACEUTICALS INC COM 12,825 521 0.01%
133 AGL RES INC 2,000 130 0.00% Put
134 AGL RES INC 200 13 0.00% Call
135 AGNICO EAGLE MINES LTD 500 18 0.00% Put
136 AGNICO EAGLE MINES LTD CALL 40,700 1,472 0.02% Call
137 AIR LEASE CORP 17,200 552 0.01% Put
138 AIR LEASE CORP 23,400 752 0.01% Call
139 AIR LEASE CORP 3,173 102 0.00%
140 AIR METHODS CORP 2,400 87 0.00% Call
141 AIR PRODS & CHEMS INC 1,800 259 0.00% Call
142 AIR PRODS & CHEMS INC 1,100 158 0.00% Put
143 AIR TRANSPORT SERVICES GRP I 12,100 186 0.00%
144 AIR TRANSPORT SERVICES GRP I 6,700 103 0.00% Call
145 AIRCASTLE LTD 1,500 33 0.00% Put
146 AIRCASTLE LTD 1,865 41 0.00%
147 AIRCASTLE LTD 2,000 44 0.00% Call
148 AIRGAS INC 3,500 496 0.01% Put
149 AIRMEDIA GROUP INC 10,400 58 0.00% Put
150 AK STL HLDG CORP 9,800 40 0.00% Put
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