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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 (2015Q3)
Portfolio Summary: 4,860 holdings with a total value of $7,233,730,000.
#
Name
Shares
Value ($)
%
Options
Notes
151 PRANA BIOTECHNOLOGY LTD 2,000 2,000 0.00% Put
152 ENERGY FUELS INC 700 2,000 0.00% Put
153 PRECISION DRILLING CORP 600 2,000 0.00% Put
154 ENBRIDGE ENERGY PARTNERS L P 100 2,000 0.00% Put
155 UTSTARCOM HOLDINGS CORP SHS NEW 700 2,000 0.00%
156 LPATH INC 8,000 2,000 0.00% Put
157 EMCORE CORP 300 2,000 0.00% Put
158 HEADWATERS INC 100 2,000 0.00% Put
159 Dex Media Inc 11,505 2,000 0.00%
160 BRANDYWINE RLTY TR 200 2,000 0.00% Put
161 MAG SILVER CORP 300 2,000 0.00% Call
162 ARCTIC CAT INC 100 2,000 0.00% Call
163 SANDRIDGE MISSISSIPPIAN TR I 979 2,000 0.00%
164 CHANGYOU COM LTD 100 2,000 0.00% Call
165 ALPHA PRO TECH LTD 1,000 2,000 0.00% Call
166 Astoria Financial Corp 100 2,000 0.00%
167 ASTA FDG INC 200 2,000 0.00% Put
168 UNIT CORP COM 200 2,000 0.00%
169 TASEKO MINES LTD 4,700 2,000 0.00% Call
170 GUESS INC 100 2,000 0.00% Put
171 HABIT RESTAURANTS INC 100 2,000 0.00% Call
172 CYS INVTS INC 300 2,000 0.00% Call
173 NORTH ATLANTIC DRILLING LTD 2,100 2,000 0.00% Call
174 BIODEL INC 4,000 2,000 0.00% Call
175 ENVIVIO INC 500 2,000 0.00% Put
176 SINOVAC BIOTECH LTD 302 2,000 0.00%
177 LPATH INC 10,380 2,000 0.00%
178 NEPTUNE TECHNOLOGIES BIORESO 1,500 2,000 0.00% Put
179 TENAX THERAPEUTICS INC 500 2,000 0.00% Call
180 WILLBROS GROUP INC DEL COM 1,900 2,000 0.00%
181 FIRSTMERIT CORP 100 2,000 0.00% Call
182 OLLIES BARGAIN OUTLT HLDGS I 100 2,000 0.00% Put
183 ENZON PHARMACEUTICALS INC 1,998 2,000 0.00%
184 MODINE MFG CO COM 200 2,000 0.00%
185 BANCORPSOUTH INC 100 2,000 0.00% Put
186 LEAPFROG ENTERPRISES INC CMN STK 3,100 2,000 0.00% Put
187 FORUM ENERGY TECHNOLOGIES IN 200 2,000 0.00% Call
188 ARDMORE SHIPPING CORP 200 2,000 0.00% Call
189 Sizmek Inc 468 3,000 0.00%
190 ENTEROMEDICS INC 11,849 3,000 0.00%
191 NIPPON TELEG TEL CORPORATION SPONSORED ADR 76 3,000 0.00%
192 Paragon Offshore PLC 13,900 3,000 0.00%
193 ROCK CREEK PHARMACEUTICALS I 4,000 3,000 0.00% Put
194 APOLLO INVT CORP 600 3,000 0.00% Put
195 ADCARE HEALTH SYSTEMS INC 1,000 3,000 0.00%
196 APIGEE CORP 300 3,000 0.00% Call
197 IMAX CORP 100 3,000 0.00% Call
198 SYNOPSYS INC 100 3,000 0.00%
199 FIVE PRIME THERAPEUTICS INC 200 3,000 0.00% Call
200 WIX COM LTD 190 3,000 0.00%
Page 4 of 98

Portfolio data is normalized using SEC Form 13F filings, including the Restatement filing (0000932540-15-000015, filed 2015.11.20).

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.