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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
251 SEADRILL LIMITED 1,137,500 6,711,000 0.09% Call
252 ZIOPHARM ONCOLOGY INC 744,500 6,708,000 0.09% Call
253 CONNS INC 277,480 6,671,000 0.09%
254 PENNEY J C INC 714,800 6,640,000 0.09% Call
255 CELLDEX THERAPEUTICS INC NEW 627,278 6,612,000 0.09%
256 NATIONAL GRID PLC 94,800 6,601,000 0.09% Call
257 HUMANA INC 36,800 6,587,000 0.09% Put
258 SCIENTIFIC GAMES CORP 630,100 6,585,000 0.09% Call
259 JUNO THERAPEUTICS INC 161,800 6,584,000 0.09% Call
260 TARGA RES CORP 127,600 6,574,000 0.09% Put
261 IONIS PHARMACEUTICAL 162,159 6,554,000 0.09%
262 POST HLDGS INC 110,484 6,530,000 0.09%
263 FRANCO NEVADA CORP 148,200 6,524,000 0.09% Call
264 MASCO CORP 258,900 6,519,000 0.09% Call
265 Call DAL $41.0 Exp Jun 16, 2017 145,200 6,515,000 0.09% Call
266 RIO TINTO PLC 192,500 6,510,000 0.09% Call
267 GOLDCORP INC NEW 517,500 6,479,000 0.09% Call
268 NOVARTIS A G 70,100 6,444,000 0.09% Call
269 YPF SOCIEDAD ANONIMA 420,100 6,398,000 0.09% Put
270 WHITEWAVE FOODS CO 158,600 6,368,000 0.09% Call
271 YPF SOCIEDAD ANONIMA 416,734 6,347,000 0.09%
272 BARCLAYS PLC 425,600 6,290,000 0.09% Put
273 MEDIVATION INC 147,800 6,282,000 0.09% Put
274 PENNEY J C 675,492 6,275,000 0.09%
275 JOY GLOBAL INC 417,300 6,230,000 0.09% Put
276 OFFICE DEPOT INC 969,900 6,227,000 0.09% Call
277 APOLLO GLOBAL MGMT LLC 359,400 6,174,000 0.09% Put
278 TASER INTL INC 280,000 6,167,000 0.09% Put
279 TIME WARNER INC NEW 34,316 6,155,000 0.09%
280 HERON THERAPEUTICS INC COM 251,951 6,148,000 0.08%
281 RESTORATION HARDWARE HLDGS I 65,700 6,130,000 0.08% Call
282 NOKIA CORP 902,600 6,120,000 0.08% Call
283 COBALT INTL ENERGY INC 862,800 6,109,000 0.08% Call
284 ACADIA PHARMACEUTICALS 183,942 6,083,000 0.08%
285 MEAD JOHNSON NUTRITION CO 85,800 6,040,000 0.08% Call
286 KKR & CO L P DEL 357,700 6,002,000 0.08% Call
287 SHIRE PLC 29,100 5,972,000 0.08% Put
288 FOUNDATION MEDICINE INC 323,100 5,961,000 0.08% Put
289 KROGER CO 165,000 5,952,000 0.08% Call
290 Hewlett Packard Ente 231,800 5,936,000 0.08% Call
291 UBIQUITI NETWORKS INC 174,900 5,927,000 0.08% Call
292 PBF ENERGY INC 209,600 5,917,000 0.08% Put
293 ISIS PHARMACEUTICALS INC 146,400 5,917,000 0.08% Call
294 EXELON CORP 199,000 5,910,000 0.08% Call
295 HUMANA INC 33,000 5,907,000 0.08% Call
296 QEP RES INC 471,200 5,904,000 0.08% Put
297 Alcatel Lucent Adr 1,616,278 5,899,000 0.08%
298 WELLTOWER INC 86,700 5,871,000 0.08% Call
299 WINDSTREAM HLDGS INC 955,500 5,867,000 0.08% Put
300 PEABODY ENERGY CORP 4,242,600 5,855,000 0.08% Call
Page 6 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.