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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 (2015Q1)
Portfolio Summary: 4,755 holdings with a total value of $6,369,518,000.
#
Name
Shares
Value ($)
%
Options
Notes
4551 MALLINCKRODT PUB LTD CO 47,200 5,978,000 0.09% Call
4552 CEMEX SAB DE CV 633,700 6,001,000 0.09% Put
4553 BIOMARIN PHARMACEUTICAL INC 48,219 6,009,000 0.09%
4554 CANADIAN PAC RY LTD 33,400 6,102,000 0.10% Put
4555 GOLAR LNG LTD 183,444 6,105,000 0.10%
4556 FORTRESS INVESTMENT GROUP LL 756,823 6,108,000 0.10%
4557 TWENTY FIRST CENTY FOX INC 180,500 6,108,000 0.10% Put
4558 TIME WARNER INC NEW 40,859 6,124,000 0.10%
4559 BARRICK GOLD CORP 563,300 6,174,000 0.10% Put
4560 JAZZ PHARMACEUTICALS PLC 35,900 6,203,000 0.10% Call
4561 FIREEYE INC 159,400 6,256,000 0.10% Put
4562 NORTHERN TIER ENERGY LP 248,100 6,287,000 0.10% Call
4563 OMNIVISION TECHNOLOGIES INC 239,600 6,318,000 0.10% Put
4564 CNOOC LTD 44,800 6,354,000 0.10% Put
4565 SEADRILL LIMITED 679,739 6,356,000 0.10%
4566 ARRAY BIOPHARMA INC 865,000 6,375,000 0.10% Call
4567 JD COM INC 217,169 6,380,000 0.10%
4568 WEYERHAEUSER CO 193,000 6,398,000 0.10% Call
4569 HERTZ GLOBAL HOLDINGS INC COM 297,789 6,456,000 0.10%
4570 ARIAD PHARMACEUTICALS INC 784,100 6,461,000 0.10% Put
4571 B/E AEROSPACE INC 102,200 6,502,000 0.10% Call
4572 PEABODY ENERGY CORP 1,350,100 6,642,000 0.10% Put
4573 MYLAN N V 112,400 6,671,000 0.10% Call
4574 MYLAN LABORATORIES INC 112,400 6,671,000 0.10% Call
4575 FREEPORT-MCMORAN INC 352,700 6,684,000 0.10% Call
4576 DISH NETWORK CORP 95,700 6,705,000 0.11% Put
4577 NATIONSTAR MTG HLDGS INC 272,100 6,740,000 0.11% Put
4578 ACADIA PHARMACEUTICALS 206,999 6,746,000 0.11%
4579 OPKO HEALTH INC 478,800 6,785,000 0.11% Put
4580 CELLDEX THERAPEUTICS INC NEW 245,800 6,850,000 0.11% Call
4581 HALLIBURTON CO 156,900 6,885,000 0.11% Call
4582 NORTHSTAR RLTY FIN CORP 380,700 6,898,000 0.11% Call
4583 INFINERA CORPORATION 351,607 6,916,000 0.11%
4584 GOGO INC 363,200 6,923,000 0.11% Call
4585 MYLAN N V 116,800 6,932,000 0.11% Put
4586 MYLAN INC 116,800 6,932,000 0.11% Put
4587 FRONTIER COMMUNICATIONS CORP 983,500 6,934,000 0.11% Call
4588 ALIBABA GROUP HLDG LTD 83,600 6,959,000 0.11% Call
4589 POWERSHS DB US DOLLAR INDEX 268,800 6,962,000 0.11% Put
4590 SPECTRA ENERGY CORP 192,600 6,966,000 0.11% Call
4591 REYNOLDS AMERICAN INC 101,300 6,981,000 0.11% Put
4592 NOW INC 323,600 7,003,000 0.11% Call
4593 OFFICE DEPOT INC 762,600 7,016,000 0.11% Call
4594 NATIONSTAR MTG HLDGS INC 283,800 7,030,000 0.11% Call
4595 PINNACLE ENTMT INC 195,100 7,041,000 0.11% Call
4596 CONNS INC 233,600 7,073,000 0.11% Call
4597 VULCAN MATLS CO 84,500 7,123,000 0.11% Call
4598 RIO TINTO PLC 172,400 7,137,000 0.11% Put
4599 ZIOPHARM ONCOLOGY INC 663,900 7,150,000 0.11% Put
4600 ENERGY XXI LTD 1,968,300 7,165,000 0.11% Call
Page 92 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.