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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 (2016Q4)
Portfolio Summary: 4,408 holdings with a total value of $10,310,067,000.
#
Name
Shares
Value ($)
%
Options
Notes
51 ISHARES SILVER TR 2,042,241 30,858,000 0.30%
52 CHESAPEAKE ENERGY CORP 4,360,800 30,613,000 0.30% Put
53 RITE AID CORP 3,641,700 30,008,000 0.29% Put
54 UNITED STATES STL CORP NEW 891,200 29,419,000 0.29% Call
55 IKANG HEALTHCARE GROUP INC 1,690,800 29,302,000 0.28% Put
56 VALEANT PHARMACEUTICALS INTL 1,979,300 28,739,000 0.28% Call
57 TEVA PHARMACEUTICAL INDS LTD 791,395 28,688,000 0.28%
58 IKANG HEALTHCARE GROUP INC 1,655,279 28,686,000 0.28%
59 HERBALIFE LTD 587,200 28,268,000 0.27% Put
60 ENERGY TRANSFER PRTNRS L P 775,700 27,778,000 0.27% Call
61 TWITTER INC 1,701,061 27,727,000 0.27%
62 GENERAL ELECTRIC CO 874,100 27,622,000 0.27% Call
63 GOLDCORP INC NEW 2,003,000 27,241,000 0.26% Call
64 FREEPORT-MCMORAN INC 2,050,500 27,046,000 0.26%
65 GW PHARMACEUTICALS PLC 232,200 25,948,000 0.25% Call
66 T MOBILE US INC 448,900 25,816,000 0.25% Call
67 HORIZON PHARMA PLC 1,594,900 25,805,000 0.25% Call
68 RANGE RES CORP 746,400 25,646,000 0.25% Put
69 ISHARES SILVER TRUST 1,689,100 25,522,000 0.25% Call
70 UNITED STATES NATL GAS FUND 2,730,600 25,504,000 0.25% Put
71 DEUTSCHE BANK AG 1,409,000 25,503,000 0.25% Call
72 SEARS HLDGS CORP PUT 2,740,100 25,456,000 0.25% Put
73 TRANSOCEAN LTD 1,725,300 25,431,000 0.25% Call
74 VALE S A 3,333,900 25,404,000 0.25% Call
75 MARATHON PETE CORP 499,800 25,165,000 0.24% Call
76 AETNA INC NEW 202,200 25,075,000 0.24% Put
77 TWITTER INC 1,527,700 24,902,000 0.24% Call
78 ARCONIC INC 1,337,600 24,799,000 0.24% Call
79 DELL TECHNOLOGIES INC 449,500 24,709,000 0.24% Put
80 VALEANT PHARMACEUTICALS INTL 1,699,800 24,681,000 0.24% Put
81 TRANSOCEAN LTD 1,669,700 24,611,000 0.24% Put
82 EXXON MOBIL CORP CALL 270,500 24,415,000 0.24% Call
83 ARCONIC INC 1,294,100 23,993,000 0.23% Put
84 UNITED STATES NATL GAS FUND 2,538,734 23,712,000 0.23%
85 ADVANCED MICRO DEVICES INC 2,083,691 23,629,000 0.23%
86 GENERAL ELECTRIC CO 740,900 23,412,000 0.23% Put
87 CONTINENTAL RESOURCES INC 449,700 23,178,000 0.22% Put
88 KINDER MORGAN INC DEL 1,101,300 22,808,000 0.22% Put
89 UNITED STATES OIL FUND LP 1,941,000 22,749,000 0.22% Put
90 AK STL HLDG CORP 2,151,200 21,964,000 0.21% Put
91 SEADRILL LIMITED 6,333,500 21,597,000 0.21% Call
92 Mobileye Nv Call Opt 09/17 48.0 565,000 21,538,000 0.21% Call
93 ABBVIE INC 342,600 21,454,000 0.21% Put
94 CHESAPEAKE ENERGY CORP 3,005,200 21,097,000 0.20% Call
95 NXP SEMICONDUCTORS N V 210,600 20,641,000 0.20% Put
96 SAREPTA THERAPEUTICS INC 741,100 20,328,000 0.20% Call
97 EXXON MOBIL CORP 221,400 19,984,000 0.19% Put
98 CTRIP COM INTL LTD 498,800 19,952,000 0.19% Call
99 GILEAD SCIENCES INC 278,600 19,951,000 0.19% Put
100 MONDELEZ INTL INC 435,517 19,306,000 0.19%
Page 2 of 89

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-17-000002, filed 2017.02.15).

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.