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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 (2015Q3)
Portfolio Summary: 4,860 holdings with a total value of $7,233,730,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 KRAFT HEINZ CO 1,490,100 105,171,000 1.45% Call
2 ALLERGAN PLC 265,200 72,084,000 1.00% Put
3 VALEANT PHARMACEUTICALS INTL PUT 387,100 69,051,000 0.95% Put
4 BARCLAYS BK PLC 2,583,200 66,130,000 0.91% Put
5 VALEANT PHARMACEUTICALS INTL 350,400 62,504,000 0.86% Call
6 ALLERGAN PLC 219,500 59,662,000 0.82% Call
7 WILLIAMS COS INC DEL 1,522,700 56,112,000 0.78% Call
8 TIME WARNER CABLE INC 306,600 54,995,000 0.76% Put
9 TRANSOCEAN LTD 3,750,700 48,459,000 0.67% Put
10 ABBVIE INC 822,700 44,763,000 0.62% Put
11 JD COM INC 1,541,300 40,166,000 0.56% Call
12 MONDELEZ INTL INC 955,700 40,015,000 0.55% Put
13 WILLIAMS COS INC DEL 1,085,300 39,993,000 0.55% Put
14 CHARTER COMMUNICATIONS INC D 223,500 39,302,000 0.54% Call
15 TIME WARNER CABLE INC 217,600 39,031,000 0.54% Call
16 KINDER MORGAN INC DEL 1,386,800 38,387,000 0.53% Call
17 PERRIGO CO PLC 237,800 37,399,000 0.52% Call
18 AMERICAN AIRLS GROUP INC 849,700 32,994,000 0.46% Put
19 AMERICAN AIRLS GROUP INC 785,994 30,520,000 0.42%
20 PRECISION CASTPARTS CORP 129,300 29,702,000 0.41% Put
21 QIHOO 360 TECHNOLOGY CO LTD 617,600 29,540,000 0.41% Put
22 ENDO INTERNATIONAL PLC 426,000 29,513,000 0.41% Put
23 CHICAGO BRIDGE & IRON CO N V 722,200 28,642,000 0.40% Put
24 ABBVIE INC 502,200 27,325,000 0.38% Call
25 MANNKIND CORP 8,440,600 27,094,000 0.37% Call
26 INTEROIL CORP 768,200 25,896,000 0.36% Put
27 Mobileye NV 550,300 25,028,000 0.35% Put
28 MALLINCKRODT PUB LTD CO 385,300 24,636,000 0.34% Put
29 PRECISION CASTPARTS CORP 102,400 23,522,000 0.33% Call
30 TEVA PHARMACEUTICAL INDUSTRIES LTD 412,600 23,295,000 0.32% Call
31 TEVA PHARMACEUTICAL INDS LTD 407,400 23,002,000 0.32% Put
32 PAYPAL HLDGS INC 740,400 22,982,000 0.32% Call
33 Mobileye NV 496,700 22,590,000 0.31% Call
34 HERBALIFE LTD 413,700 22,547,000 0.31% Call
35 CONSOL ENERGY INC 2,270,200 22,248,000 0.31% Call
36 CHESAPEAKE ENERGY CORP CALL 3,027,300 22,190,000 0.31% Call
37 HERBALIFE LTD 406,200 22,138,000 0.31% Put
38 BARCLAYS BK PLC 845,000 21,632,000 0.30% Call
39 MYLAN N V 534,100 21,503,000 0.30% Put
40 MYLAN N.V. 529,000 21,298,000 0.29% Call
41 SUNEDISON INC 2,955,800 21,223,000 0.29% Call
42 OCWEN FINL CORP 3,160,700 21,208,000 0.29% Put
43 ABBVIE INC 387,741 21,097,000 0.29%
44 FIDELITY NATIONAL FINANCIAL 592,600 21,020,000 0.29% Put
45 PERRIGO CO PLC 131,800 20,728,000 0.29% Put
46 CONSOL ENERGY INC 2,103,600 20,615,000 0.28% Put
47 MONDELEZ INTL INC 491,200 20,567,000 0.28% Call
48 OPKO HEALTH INC 2,433,700 20,467,000 0.28% Put
49 BIOMARIN PHARMACEUTICAL INC 192,300 20,253,000 0.28% Put
50 JD COM INC 754,200 19,654,000 0.27% Put
Page 1 of 98

Portfolio data is normalized using SEC Form 13F filings, including the Restatement filing (0000932540-15-000015, filed 2015.11.20).

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.