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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 (2015Q2)
Portfolio Summary: 4,849 holdings with a total value of $7,147,569,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 TIME WARNER CABLE INC 908,500 161,867,000 2.26% Put
2 ALLERGAN PLC 248,400 75,379,000 1.05% Put
3 ABBVIE INC 1,048,200 70,429,000 0.99% Put
4 KINDER MORGAN INC DEL 1,497,400 57,485,000 0.80% Call
5 WILLIAMS COS INC DEL 998,600 57,310,000 0.80% Put
6 VALEANT PHARMACEUTICALS INTL PUT 247,300 54,938,000 0.77% Put
7 WILLIAMS COS INC DEL 946,200 54,302,000 0.76% Call
8 MANNKIND CORP 9,217,700 52,449,000 0.73% Call
9 MYLAN N.V. 745,400 50,583,000 0.71% Call
10 JD COM INC 1,416,800 48,313,000 0.68% Call
11 ABBVIE INC 673,400 45,246,000 0.63% Call
12 OCWEN FINL CORP 4,337,200 44,239,000 0.62% Put
13 RAPTOR PHARMACEUTICAL CORP 2,593,000 40,943,000 0.57% Put
14 MALLINCKRODT PUB LTD CO 335,900 39,542,000 0.55% Put
15 MYLAN N V 573,200 38,897,000 0.54% Put
16 JD COM INC 1,073,800 36,617,000 0.51% Put
17 ALLERGAN PLC 119,500 36,263,000 0.51% Call
18 TIME WARNER CABLE INC 191,400 34,102,000 0.48% Call
19 BIOMARIN PHARMACEUTICAL INC 243,700 33,333,000 0.47% Put
20 CONSOL ENERGY INC 1,531,500 33,295,000 0.47% Call
21 QIHOO 360 TECHNOLOGY CO LTD 489,900 33,161,000 0.46% Put
22 AMERICAN AIRLS GROUP INC 749,949 29,949,000 0.42%
23 INTEROIL CORP 492,400 29,642,000 0.41% Put
24 CHICAGO BRIDGE & IRON CO N V 591,800 29,614,000 0.41% Put
25 YPF SOCIEDAD ANONIMA 1,038,200 28,478,000 0.40% Call
26 HERBALIFE LTD 509,500 28,068,000 0.39% Call
27 GILEAD SCIENCES INC 234,500 27,455,000 0.38% Put
28 PERRIGO CO PLC 146,200 27,022,000 0.38% Call
29 AMERICAN AIRLS GROUP INC 661,700 26,425,000 0.37% Put
30 MANNKIND CORP 4,571,700 26,013,000 0.36% Put
31 OPKO HEALTH INC 1,598,000 25,696,000 0.36% Call
32 JD COM INC ADR 747,037 25,474,000 0.36%
33 ALEXION PHARMACEUTICALS INC 140,500 25,398,000 0.36% Put
34 WILLIAMS COS INC DEL 440,602 25,286,000 0.35%
35 AMBARELLA INC 243,900 25,046,000 0.35% Put
36 SEADRILL LIMITED 2,380,200 24,611,000 0.34% Put
37 WEYERHAEUSER CO 775,300 24,422,000 0.34% Call
38 ILLUMINA INC 110,200 24,063,000 0.34% Put
39 BARCLAYS BK PLC 1,192,100 23,961,000 0.34% Put
40 TIME WARNER INC NEW 133,100 23,714,000 0.33%
41 VALEANT PHARMACEUTICALS INTL 105,600 23,459,000 0.33% Call
42 TRANSOCEAN LTD 1,421,600 22,916,000 0.32% Put
43 HERBALIFE LTD 414,800 22,851,000 0.32% Put
44 CELLDEX THERAPEUTICS INC NEW 901,800 22,743,000 0.32% Put
45 BLACKBERRY LTD 2,719,200 22,243,000 0.31% Put
46 KRAFT FOODS GROUP INC 260,300 22,162,000 0.31% Call
47 BLACKBERRY LTD 2,683,581 21,952,000 0.31%
48 PERRIGO CO PLC 118,400 21,884,000 0.31% Put
49 VIPSHOP HLDGS LTD 983,400 21,881,000 0.31% Put
50 FIDELITY NATIONAL FINANCIAL 583,900 21,598,000 0.30% Put
Page 1 of 97

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-15-000009, filed 2015.08.11).

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.