Dark
Light
System
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 (2015Q1)
Portfolio Summary: 4,755 holdings with a total value of $6,369,518,000.
#
Name
Shares
Value ($)
%
Options
Notes
51 JD COM INC 591,400 17,375,000 0.27% Call
52 CLIFFS NAT RES INC 3,608,300 17,356,000 0.27% Put
53 SEARS HLDGS CORP 410,200 16,974,000 0.27% Call
54 OCWEN FINL CORP 2,038,800 16,820,000 0.26% Put
55 PENNEY J C INC 1,997,200 16,796,000 0.26% Put
56 ISIS PHARMACEUTICALS INC 259,000 16,491,000 0.26% Call
57 GOPRO INC 360,700 15,658,000 0.25% Call
58 BANCO SANTANDER SA 2,065,400 15,387,000 0.24% Put
59 Call GILD $70.0 Exp Jun 16, 2017 154,400 15,151,000 0.24% Call
60 GOPRO INC 343,400 14,907,000 0.23% Put
61 AMERICAN RLTY CAP PPTYS INC 1,504,300 14,817,000 0.23% Put
62 SOUTHWEST AIRLS CO 334,000 14,796,000 0.23% Call
63 UNITED STATES OIL FUND LP 867,700 14,612,000 0.23% Call
64 OPKO HEALTH INC 1,030,400 14,601,000 0.23% Call
65 GREEN PLAINS INC 494,500 14,118,000 0.22% Call
66 MANNKIND CORP 2,654,800 13,805,000 0.22% Put
67 LINN ENERGY LLC 1,211,600 13,400,000 0.21% Call
68 BLOCK H & R INC 416,300 13,351,000 0.21% Call
69 SUNEDISON INC 550,300 13,207,000 0.21% Call
70 DRESSER-RAND GROUP INC 164,200 13,193,000 0.21% Call
71 MACERICH CO 155,900 13,147,000 0.21% Put
72 BAKER HUGHES INC 205,400 13,059,000 0.21% Call
73 POWERSHS DB US DOLLAR INDEX 482,400 12,494,000 0.20% Call
74 BARCLAYS BK PLC 487,100 12,484,000 0.20% Call
75 ISIS PHARMACEUTICALS INC 195,700 12,460,000 0.20% Put
76 INTREXON CORP 273,800 12,422,000 0.20% Put
77 HERTZ GLOBAL HOLDINGS INC 568,600 12,327,000 0.19% Call
78 ADVANCED MICRO DEVICES INC 4,570,500 12,249,000 0.19% Put
79 COBALT INTL ENERGY INC 1,286,200 12,103,000 0.19% Call
80 VIPSHOP HLDGS LTD 406,500 11,967,000 0.19% Put
81 CONNS INC 395,200 11,967,000 0.19% Put
82 CURRENCYSHS JAPANESE YEN TR 146,700 11,886,000 0.19% Put
83 CENTURYLINK INC 333,900 11,536,000 0.18% Call
84 RAPTOR PHARMACEUTICAL CORP 1,053,829 11,455,000 0.18%
85 InterOil Corp 248,088 11,447,000 0.18%
86 VODAFONE GROUP PLC NEW 348,500 11,389,000 0.18% Call
87 ZIOPHARM ONCOLOGY INC 1,056,500 11,379,000 0.18% Call
88 NEWLINK GENETICS CORP 203,600 11,139,000 0.17% Put
89 QORVO INC 138,200 11,015,000 0.17% Put
90 MOBILEYE N V AMSTELVEEN 259,838 10,921,000 0.17%
91 RITE AID CORP 1,256,600 10,920,000 0.17% Put
92 WILLIAMS COS INC DEL 214,100 10,831,000 0.17% Put
93 PPL CORP 319,500 10,754,000 0.17% Call
94 NXP SEMICONDUCTORS N V 106,200 10,658,000 0.17% Call
95 INVESCO LTD 267,300 10,609,000 0.17% Call
96 AMERICAN CAPITAL AGENCY CORP 497,300 10,607,000 0.17% Put
97 BRISTOL MYERS SQUIBB CO 163,900 10,572,000 0.17% Call
98 BLACKBERRY LTD 1,175,800 10,500,000 0.16% Call
99 OCWEN FINL CORP 1,257,700 10,376,000 0.16% Call
100 JD COM INC 353,000 10,371,000 0.16% Put
Page 2 of 96

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-15-000007, filed 2015.05.14).

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.