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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 (2015Q4)
Portfolio Summary: 4,723 holdings with a total value of $8,460,518,000.
#
Name
Shares
Value ($)
%
Options
Notes
251 WISDOMTREE INVTS INC 447,700 7,020,000 0.08% Put
252 TWENTY-FIRST CENTURY FOX-A 256,700 6,972,000 0.08% Call
253 YPF SOCIEDAD ANONIMA 443,363 6,970,000 0.08%
254 VALE S A 2,106,700 6,931,000 0.08% Put
255 GRACE W R & CO DEL NEW 69,300 6,902,000 0.08% Call
256 COBALT INTL ENERGY INC 1,276,200 6,891,000 0.08% Put
257 NIKE INC 109,800 6,863,000 0.08% Put
258 NORTHSTAR RLTY FIN CORP 401,700 6,841,000 0.08% Call
259 CONTINENTAL RESOURCES INC 297,100 6,827,000 0.08% Put
260 BP PLC 217,300 6,793,000 0.08% Call
261 HERBALIFE LTD 126,256 6,770,000 0.08%
262 AETNA INC NEW 62,500 6,758,000 0.08% Call
263 CSX CORP 259,300 6,729,000 0.08% Call
264 UNITED STATES NATL GAS FUND 776,068 6,729,000 0.08%
265 RIO TINTO PLC 229,900 6,695,000 0.08% Put
266 AETNA INC NEW 61,500 6,649,000 0.08% Put
267 DYAX CORP 176,400 6,636,000 0.08% Put
268 ACADIA PHARMACEUTICALS INC 185,500 6,613,000 0.08% Put
269 CAMERON INTERNATIONAL CORP 104,000 6,573,000 0.08% Put
270 GLAXOSMITHKLINE PLC 161,900 6,533,000 0.08% Put
271 VERTEX PHARMACEUTICALS INC 51,900 6,531,000 0.08% Call
272 WINDSTREAM HLDGS INC 1,011,500 6,514,000 0.08% Put
273 JOY GLOBAL INCORPORATED 516,197 6,509,000 0.08%
274 CURRENCYSHS JAPANESE YEN TR 80,100 6,458,000 0.08% Put
275 CABLEVISION SYS CORP(NEW) NY GROUP CL ACOM 202,252 6,452,000 0.08%
276 BRISTOL MYERS SQUIBB CO 93,600 6,439,000 0.08% Put
277 VIRGIN AMER INC 178,100 6,413,000 0.08% Call
278 INTERNATIONAL GAME TECHNOLOG 396,200 6,411,000 0.08% Call
279 CABLEVISION SYS CORP 200,600 6,399,000 0.08% Call
280 SONY CORP 259,700 6,391,000 0.08% Call
281 FOUNDATION MEDICINE INC 301,500 6,350,000 0.08% Put
282 ENTERPRISE PRODS PARTNERS L 248,000 6,344,000 0.07% Put
283 SOUFUN HLDGS LTD 856,900 6,332,000 0.07% Call
284 KKR & CO L P DEL 403,200 6,286,000 0.07% Put
285 BARCLAYS PLC 484,400 6,278,000 0.07% Put
286 BLOCK H & R INC 188,000 6,262,000 0.07% Call
287 VODAFONE GROUP PLC NEW 193,700 6,249,000 0.07% Call
288 ADVANCED MICRO DEVICES INC 2,176,100 6,245,000 0.07% Call
289 GOLDCORP INC NEW 539,500 6,237,000 0.07% Call
290 EXPEDIA INC DEL 50,100 6,227,000 0.07% Call
291 PAYCHEX INC 117,700 6,225,000 0.07% Call
292 SEAWORLD ENTMT INC 315,900 6,220,000 0.07% Put
293 SCHWAB CHARLES CORP NEW 188,800 6,217,000 0.07% Call
294 AMBARELLA INC 111,300 6,204,000 0.07% Put
295 VULCAN MATLS CO 65,200 6,192,000 0.07% Call
296 Call NUAN $19.0 Exp Oct 20, 2017 310,900 6,184,000 0.07% Call
297 RAPTOR PHARMACEUTICAL CORP 1,172,500 6,097,000 0.07% Put
298 EXELON CORP 218,200 6,059,000 0.07% Call
299 RESTAURANT BRANDS INTL INC 161,800 6,045,000 0.07% Put
300 BANK AMER CORP 359,000 6,042,000 0.07% Call
Page 6 of 95

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-16-000018, filed 2016.02.11).

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.