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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 (2016Q2)
Original 13F HR (0000932540-16-000023) filed in 2016.08.12
#
Name
Shares
Value ($)
%
Options
Notes
4451 WESCO INTL INC 1,500 77 0.00% Put
4452 WESTERN ALLIANCE BANCORP 353 12 0.00%
4453 WESTERN ALLIANCE BANCORP 3,800 124 0.00% Call
4454 WESTERN ASSET MTG CAP CORP 17,300 162 0.00% Put
4455 WESTERN ASSET MTG CAP CORP 40,800 383 0.00% Call
4456 WESTERN DIGITAL CORP 591,900 27,973 0.33% Put
4457 WESTERN DIGITAL CORP 42,781 2,022 0.02%
4458 WESTERN DIGITAL CORP 101,000 4,773 0.06% Call
4459 WESTERN GAS PARTNERS LP 52,600 2,651 0.03% Call
4460 WESTERN REFNG INC 152,300 3,142 0.04% Call
4461 WESTERN REFNG INC 100,679 2,077 0.02%
4462 WESTERN REFNG INC 74,000 1,527 0.02% Put
4463 WESTERN REFNG LOGISTICS LP 2,134 56 0.00%
4464 WESTERN REFNG LOGISTICS LP 4,200 110 0.00% Call
4465 WESTERN UN CO 156,200 2,996 0.04% Call
4466 WESTERN UN CO 46,800 898 0.01% Put
4467 WESTLAKE CHEM PARTNERS LP 8,000 160 0.00% Call
4468 WESTLAKE CHEM PARTNERS LP 2,500 50 0.00% Put
4469 WESTMORELAND COAL CO 62,600 596 0.01% Call
4470 WESTMORELAND COAL CO 63,100 601 0.01% Put
4471 WESTPORT FUEL SYSTEMS INC 87,700 146 0.00% Put
4472 WESTPORT FUEL SYSTEMS INC 37,416 62 0.00%
4473 WESTPORT FUEL SYSTEMS INC 37,400 62 0.00% Call
4474 WESTROCK CO 7,700 299 0.00% Put
4475 WESTROCK CO CALL 25,400 987 0.01% Call
4476 WEYERHAEUSER CO 47,930 1,427 0.02%
4477 WEYERHAEUSER CO 52,100 1,551 0.02% Call
4478 WEYERHAEUSER CO 104,800 3,120 0.04% Put
4479 WGL HLDGS INC 200 14 0.00% Call
4480 WHITESTONE REIT 11,467 173 0.00%
4481 WHITEWAVE FOODS CO 50,207 2,357 0.03%
4482 WHITEWAVE FOODS CO 211,000 9,904 0.12% Call
4483 WHITEWAVE FOODS CO 29,500 1,385 0.02% Put
4484 WHITING PETE CORP NEW 538,600 4,987 0.06% Put
4485 WHITING PETROLEUM CORP NEW 617,500 5,718 0.07% Call
4486 WHOLE FOODS MKT INC 10,000 320 0.00% Call
4487 WHOLE FOODS MKT INC 5,100 163 0.00% Put
4488 WILLBROS GROUP INC DEL 6,000 15 0.00% Call
4489 WILLBROS GROUP INC DEL COM 651 2 0.00%
4490 WILLIAMS COS INC DEL 757,300 16,380 0.19% Call
4491 WILLIAMS COS INC DEL 865,700 18,725 0.22% Put
4492 WILLIAMS PARTNERS L P NEW 229,400 7,946 0.09% Call
4493 WILLIAMS PARTNERS L P NEW 9,533 330 0.00%
4494 WILLIAMS PARTNERS L P NEW 142,800 4,947 0.06% Put
4495 WILLIAMS SONOMA INC 24,262 1,265 0.01%
4496 WILLIAMS SONOMA INC 46,300 2,414 0.03% Call
4497 WILLIAMS SONOMA INC 40,600 2,116 0.03% Put
4498 WINDSTREAM HLDGS INC 523,100 4,849 0.06% Call
4499 WINDSTREAM HLDGS INC 152,300 1,412 0.02% Put
4500 WINDSTREAM HLDGS INC 3,000 28 0.00%
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