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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
1 ALLERGAN PLC 895,800 279,938,000 3.31% Put
2 VALEANT PHARMACEUTICALS INTL PUT 1,588,100 161,430,000 1.91% Put
3 VALEANT PHARMACEUTICALS INTL 1,485,200 150,971,000 1.78% Call
4 ALLERGAN PLC 472,800 147,750,000 1.75% Call
5 KRAFT HEINZ CO 1,637,900 119,174,000 1.41% Call
6 ALLERGAN PLC 318,915 99,661,000 1.18%
7 21VIANET GROUP INC 2,871,900 60,712,000 0.72% Put
8 ABBVIE INC 949,200 56,231,000 0.66% Put
9 AMERICAN AIRLS GROUP INC 1,304,200 55,233,000 0.65% Call
10 MYLAN N V 981,200 53,053,000 0.63% Put
11 21VIANET GROUP INC 2,407,862 50,902,000 0.60%
12 EXXON MOBIL CORP 650,300 50,691,000 0.60% Call
13 PEABODY ENERGY CORP 6,201,600 47,628,000 0.56% Call
14 JD COM INC 1,408,400 45,442,000 0.54% Call
15 CHARTER COMMUNICATIONS INC D 243,300 44,548,000 0.53% Call
16 SOLARCITY CORP 848,400 43,285,000 0.51% Call
17 DISNEY WALT CO 408,000 42,873,000 0.51% Call
18 VALEANT PHARMACEUTICALS INTL 413,358 42,018,000 0.50%
19 BARCLAYS BK PLC 2,002,500 40,330,000 0.48% Put
20 QIHOO 360 TECHNOLOGY CO LTD 550,700 40,096,000 0.47% Put
21 PRECISION CASTPARTS CORP 161,300 37,423,000 0.44% Put
22 Charter Communications, Inc. 201,300 36,858,000 0.44% Put
23 MONDELEZ INTL INC 810,900 36,361,000 0.43% Put
24 CONSOL ENERGY INC 4,583,200 36,207,000 0.43% Call
25 TEVA PHARMACEUTICAL INDS LTD 518,100 34,008,000 0.40% Put
26 ABBVIE INC 540,700 32,031,000 0.38% Call
27 KINDER MORGAN INC DEL 2,124,700 31,701,000 0.37% Call
28 MYLAN N.V. 576,600 31,177,000 0.37% Call
29 TIME WARNER CABLE INC 159,500 29,602,000 0.35% Put
30 OPKO HEALTH INC 2,891,100 29,056,000 0.34% Put
31 MYLAN N V 528,670 28,585,000 0.34%
32 BLACKBERRY LTD 3,078,900 28,572,000 0.34% Put
33 DISNEY WALT CO 269,900 28,361,000 0.34% Put
34 Mobileye NV 655,600 27,719,000 0.33% Call
35 ENDO INTERNATIONAL PLC 447,700 27,408,000 0.32% Put
36 HERBALIFE LTD 508,300 27,255,000 0.32% Put
37 QIHOO 360 TECHNOLOGY CO LTD CALL 368,500 26,830,000 0.32% Call
38 AMERICAN AIRLS GROUP INC 631,400 26,740,000 0.32% Put
39 INTEROIL CORP 841,300 26,434,000 0.31% Put
40 WEIGHT WATCHERS INTL INC NEW PUT 1,147,200 26,156,000 0.31% Put
41 AMERICAN AIRLS GROUP INC 601,285 25,464,000 0.30%
42 TRANSOCEAN LTD 2,056,200 25,456,000 0.30% Put
43 BLACKBERRY LTD 2,694,544 25,005,000 0.30%
44 JD COM INC 768,800 24,805,000 0.29% Put
45 GILEAD SCIENCES INC 242,100 24,498,000 0.29% Put
46 PERRIGO CO PLC 166,100 24,035,000 0.28% Call
47 TEVA PHARMACEUTICAL INDUSTRIES LTD 364,500 23,926,000 0.28% Call
48 SOLARCITY CORP 465,500 23,750,000 0.28% Put
49 GILEAD SCIENCES INC 233,500 23,628,000 0.28% Call
50 TWITTER INC 1,017,800 23,552,000 0.28% Call
Page 1 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.