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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 (2015Q4)
Portfolio Summary: 4,723 holdings with a total value of $8,460,518,000.
#
Name
Shares
Value ($)
%
Options
Notes
4601 CINCINNATI BELL INC NEW 300 1,000 0.00% Put
4602 CHECKPOINT SYS INC 100 1,000 0.00% Call
4603 UNILIFE CORP NEW 2,300 1,000 0.00% Put
4604 XENCOR INC 100 1,000 0.00% Call
4605 FREDS INC-TENN CL A 34 1,000 0.00%
4606 Biocept Inc. (BIOC) 600 1,000 0.00%
4607 ENERGOUS CORP 100 1,000 0.00%
4608 ENERNOC INC 300 1,000 0.00% Put
4609 FNB CORP PA 100 1,000 0.00%
4610 FOUR CORNERS PPTY TR INC COM 55 1,000 0.00%
4611 GOLDEN OCEAN GRP LTD 522 1,000 0.00%
4612 NEPTUNE TECHNOLOGIES BIORESO 1,000 1,000 0.00% Put
4613 FLWS/1-800 FLOWERS 200 1,000 0.00% Call
4614 CHICOS FAS INC 100 1,000 0.00% Call
4615 ADAMIS PHARMACEUTICALS CORP 216 1,000 0.00%
4616 TIMKENSTEEL CORP 100 1,000 0.00% Put
4617 SUNCOKE ENERGY PARTNERS L P 200 1,000 0.00% Call
4618 RMR GROUP INC 99 1,000 0.00%
4619 Nuverra Environmental Solutions Inc 1,569 1,000 0.00%
4620 SUPERCONDUCTOR TECHNOLOGIES 2,500 1,000 0.00% Call
4621 ENZON PHARMACEUTICALS INC 1,200 1,000 0.00% Put
4622 COMSTOCK RES INC 400 1,000 0.00% Put
4623 TALEN ENERGY CORP 100 1,000 0.00% Call
4624 GEVO INC 1,000 1,000 0.00% Put
4625 HUGOTON RTY TR TEX 400 1,000 0.00% Put
4626 KEYW HLDG CORP 201 1,000 0.00%
4627 STAR BULK CARRIERS CORP 1,800 1,000 0.00% Put
4628 ODYSSEY MARINE EXPLORATION I 2,200 1,000 0.00% Call
4629 CASTLIGHT HEALTH INC COM CL B 200 1,000 0.00%
4630 ACELRX PHARMACEUTICALS INC 200 1,000 0.00% Put
4631 GOLDEN MINERALS CO 5,098 1,000 0.00%
4632 LPATH INC 2,800 1,000 0.00% Call
4633 TRIANGLE PETE CORP 1,000 1,000 0.00% Call
4634 HONGLI CLEAN ENERGY TECHNOLO 1,327 1,000 0.00%
4635 COSTAMARE INC 100 1,000 0.00% Call
4636 GOLDEN OCEAN GROUP LTD 1,300 1,000 0.00% Call
4637 FORUM ENERGY TECHNOLOGIES IN 100 1,000 0.00% Call
4638 PGT INNOVATIONS INC 100 1,000 0.00% Call
4639 ENTEROMEDICS INC 10,900 1,000 0.00% Call
4640 HARVEST NATURAL RESOURCES IN 2,000 1,000 0.00% Call
4641 NRG YIELD INC 69 1,000 0.00%
4642 ORION ENERGY SYSTEMS INC 500 1,000 0.00% Call
4643 SINOVAC BIOTECH LTD 100 1,000 0.00% Call
4644 SCICLONE PHARMACEUTICALS INC 100 1,000 0.00% Put
4645 LIGHTINTHEBOX HLDG CO LTD 300 1,000 0.00% Put
4646 BSQUARE CORP 158 1,000 0.00%
4647 NIMBLE STORAGE INC 100 1,000 0.00% Put
4648 GUIDANCE SOFTWARE INC 100 1,000 0.00% Put
4649 ENERGY RECOVERY INC 100 1,000 0.00% Put
4650 ATHERSYS INC 800 1,000 0.00% Put
Page 93 of 95

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-16-000018, filed 2016.02.11).

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.