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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
4701 CLEVELAND BIOLABS INC 164 1,000 0.00%
4702 ACURA PHARMACEUTICALS INC 676 1,000 0.00%
4703 ONCOGENEX PHARMACEUTICALS IN 500 1,000 0.00% Call
4704 Plains Gp Hldgs Lp Npv A 18 1,000 0.00%
4705 ASSEMBLY BIOSCIENCES INC 62 1,000 0.00%
4706 SERVICESOURCE INTL INC 400 1,000 0.00% Call
4707 PRANA BIOTECHNOLOGY LTD 1,300 1,000 0.00% Put
4708 TRAVELZOO INC 100 1,000 0.00% Put
4709 PERMIAN BASIN RTY TR 100 1,000 0.00% Call
4710 GULF RESOURCES INC 900 1,000 0.00% Call
4711 CLEARSIGN COMBUSTION CRP 100 1,000 0.00%
4712 SYNCHRONOSS TECHNOLOGIES INC 26 1,000 0.00%
4713 SUNGY MOBILE LTD 100 0 0.00% Call
4714 LG DISPLAY CO LTD 25 0 0.00%
4715 MITCHAM INDS INC 100 0 0.00% Call
4716 IMMUNOCELLULAR THERAPEUTICS 300 0 0.00% Put
4717 MARATHON OIL CORP 9 0 0.00%
4718 DRAGONWAVE INC 119 0 0.00%
4719 FEMALE HEALTH CO 100 0 0.00%
4720 QUICKSILVER RESOURCES INC 1,000 0 0.00% Put
4721 SMART TECHNOLOGIES INC 1 0 0.00%
4722 WET SEAL INC 29,590 0 0.00%
4723 KEMET CORP COM NEW 74 0 0.00%
4724 ROCK CREEK PHARMACEUTICALS I 4,000 0 0.00% Put
4725 KEMET CORP 100 0 0.00% Call
4726 MCCLATCHY CO 200 0 0.00% Call
4727 FIBROCELL SCIENCE INC 100 0 0.00% Call
4728 TOWERSTREAM CORP 135 0 0.00%
4729 ALEXCO RESOURCE CORP 22 0 0.00%
4730 BENEFICIAL BANCORP INC 13 0 0.00%
4731 BALTIC TRADING LIMITED 200 0 0.00% Call
4732 TANZANIAN ROYALTY EXPL CORP 100 0 0.00% Put
4733 ACTINIUM PHARMACEUTICALS INC 200 0 0.00% Call
4734 URANIUM RES INC 300 0 0.00% Call
4735 GOLDEN STAR RES LTD CDA 1,911 0 0.00%
4736 STRATA SKIN SCIENCES INC COM 1 0 0.00%
4737 E2OPEN INC 64 0 0.00%
4738 WARREN RES INC 400 0 0.00% Call
4739 CANCER GENETICS 1 0 0.00%
4740 ROYALE ENERGY INC 81 0 0.00%
4741 MATTSON TECHNOLOGY INC 100 0 0.00% Put
4742 Beneficial Bancorp, Inc. 13 0 0.00%
4743 Corinthian Colleges, Inc. 271 0 0.00%
4744 PARAGON OFFSHORE PLC 200 0 0.00% Put
4745 SANDSTORM GOLD LTD 100 0 0.00%
4746 ROSETTA GENOMICS LTD 100 0 0.00% Call
4747 VERSO CORP 100 0 0.00% Put
4748 WEST MARINE INC COM 50 0 0.00%
4749 ONCOLYTICS BIOTECH INC 200 0 0.00% Put
4750 OCI PARTNERS LP 26 0 0.00%
Page 95 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.