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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
51 GENERAL ELECTRIC CO 755,500 23,534,000 0.28% Call
52 MALLINCKRODT PUB LTD CO 310,700 23,188,000 0.27% Put
53 JETBLUE AIRWAYS CORP 1,005,000 22,763,000 0.27% Call
54 PRECISION CASTPARTS CORP 95,200 22,087,000 0.26% Call
55 Microsoft Corp Call Opt 01/18 67.5 379,000 21,027,000 0.25% Call
56 CHESAPEAKE ENERGY CORP 4,664,900 20,992,000 0.25% Call
57 ABBVIE INC 353,026 20,913,000 0.25%
58 XILINX INC 440,600 20,695,000 0.24% Call
59 TIME WARNER CABLE INC 111,400 20,675,000 0.24% Call
60 MONDELEZ INTL INC 460,300 20,640,000 0.24% Call
61 OPKO HEALTH INC 2,020,776 20,309,000 0.24%
62 WAL-MART STORES INC 323,900 19,855,000 0.23% Call
63 AVAGO TECHNOLOGIES LTD 131,800 19,131,000 0.23% Put
64 WEIGHT WATCHERS INTL INC NEW 838,500 19,118,000 0.23% Call
65 WILLIAMS COS INC DEL 733,800 18,859,000 0.22% Put
66 PRECISION CASTPARTS 80,732 18,731,000 0.22%
67 PENNEY J C INC 2,804,600 18,679,000 0.22% Put
68 FITBIT INC 605,600 17,920,000 0.21% Call
69 EXXON MOBIL CORP 223,200 17,398,000 0.21% Put
70 PFIZER INC 527,000 17,012,000 0.20% Put
71 MOBILEYE N V AMSTELVEEN 402,200 17,005,000 0.20% Put
72 SUNEDISON INC 3,325,100 16,925,000 0.20% Put
73 BRISTOL MYERS SQUIBB CO 246,000 16,922,000 0.20% Call
74 AVAGO TECHNOLOGIES LTD 115,800 16,808,000 0.20% Call
75 KINDER MORGAN INC DEL 1,123,100 16,757,000 0.20% Put
76 WILLIAMS COS INC DEL 651,000 16,731,000 0.20% Call
77 SAREPTA THERAPEUTICS INC 429,800 16,582,000 0.20% Call
78 YUM BRANDS INC 225,000 16,436,000 0.19% Call
79 CHICAGO BRIDGE & IRON CO N V 421,100 16,419,000 0.19% Put
80 LUMBER LIQUIDATORS HLDGS INC 944,800 16,402,000 0.19% Call
81 GLAXOSMITHKLINE PLC 401,500 16,201,000 0.19% Call
82 SUNEDISON INC 3,168,200 16,126,000 0.19% Call
83 TWITTER INC 696,400 16,115,000 0.19% Put
84 ALIBABA GROUP HLDG LTD 197,400 16,043,000 0.19% Call
85 PEABODY ENERGY CORP 2,084,200 16,007,000 0.19% Put
86 SERVICENOW INC 182,300 15,780,000 0.19% Call
87 SEARS HLDGS CORP PUT 761,800 15,663,000 0.19% Put
88 HERTZ GLOBAL HOLDINGS INC 1,097,600 15,619,000 0.18% Call
89 OPKO HEALTH INC 1,551,700 15,595,000 0.18% Call
90 PANDORA MEDIA INC 1,154,400 15,481,000 0.18% Call
91 ENTERPRISE PRODS PARTNERS L 602,700 15,417,000 0.18% Call
92 TRANSOCEAN LTD 1,222,900 15,140,000 0.18% Call
93 ALCOA INC 1,507,400 14,878,000 0.18% Put
94 Micron Technology Inc Call Opt 07/17 23.0 1,011,300 14,320,000 0.17% Call
95 MARKET VECTORS ETF TR GOLD MINER ETF 1,040,900 14,281,000 0.17% Call
96 OCWEN FINL CORP 2,024,300 14,109,000 0.17% Put
97 MEAD JOHNSON NUTRITION CO 178,700 14,108,000 0.17% Call
98 OFFICE DEPOT INC 2,487,300 14,028,000 0.17% Put
99 BAXTER INTL INC 365,300 13,936,000 0.16% Call
100 EBAY INC 506,300 13,913,000 0.16% Call
Page 2 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.