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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 (2016Q1)
Portfolio Summary: 4,548 holdings with a total value of $7,083,142,000.
#
Name
Shares
Value ($)
%
Options
Notes
4501 ARCHROCK INC 100 1,000 0.00% Put
4502 HONGLI CLEAN ENERGY TECHNOLO 1,327 0 0.00%
4503 GOLDEN OCEAN GRP LTD 522 0 0.00%
4504 CECO ENVIRONMENTAL CORP 40 0 0.00%
4505 INFINITY PHARMACEUTICALS INC COM 3 0 0.00%
4506 GREAT PANTHER SILVER LTD 59 0 0.00%
4507 ENERGY FUELS INC 200 0 0.00% Put
4508 LA JOLLA PHARMACEUTICAL CO 5 0 0.00%
4509 UQM TECHNOLOGIES INC COM 752 0 0.00%
4510 VERASTEM INC COM 66 0 0.00%
4511 PROSHARES TR 1 0 0.00%
4512 CERAGON NETWORKS LTD ORD 11 0 0.00%
4513 NORTHERN DYNASTY MINERALS LTD COM 1,500 0 0.00%
4514 STERLING CONSTRUCTION CO INC 67 0 0.00%
4515 PRECISION DRILLING CORP 100 0 0.00% Put
4516 FAIRWAY GROUP HLDGS CORP 600 0 0.00% Put
4517 Aerohive Networks, Inc. 75 0 0.00%
4518 PARAMOUNT GOLD NEV CORP 19 0 0.00%
4519 BANCO SANTANDER BRASIL S A ADS REP 1 UNIT 100 0 0.00%
4520 PROTALIX BIOTHERAPEUTICS INC 366 0 0.00%
4521 PERNIX THERAPEUTICS HLDGS IN 300 0 0.00%
4522 Hercules Offshore 139 0 0.00%
4523 ABRAXAS PETE CORP 400 0 0.00% Put
4524 ALEXCO RESOURCE CORP 122 0 0.00%
4525 AZURE MIDSTREAM PARTNERS LP 100 0 0.00% Put
4526 Rubicon Technology 18 0 0.00%
4527 ImmunoCellular Therapeutics Lt 669 0 0.00%
4528 SYNTA PHARMACEUTICALS CORP 1,500 0 0.00% Put
4529 NORTH EUROPEAN 10 0 0.00%
4530 NAVIOS MARITIME PARTNERS L P 300 0 0.00% Call
4531 BANRO CORP 1,200 0 0.00%
4532 HACKETT GROUP INC COM 19 0 0.00%
4533 RESOURCE CAP CORP COM NEW 20 0 0.00%
4534 INTELSAT S A 133 0 0.00%
4535 Anworth Mtg Asset Corp 100 0 0.00%
4536 NANOSPHERE INC 76 0 0.00%
4537 STRATA SKIN SCIENCES INC COM 1 0 0.00%
4538 ROSETTA GENOMICS LTD 100 0 0.00% Put
4539 AXCELIS TECHNOLOGIES INC 100 0 0.00% Call
4540 Key Energy Services Inc 368 0 0.00%
4541 REX ENERGY CORPORATION 100 0 0.00% Put
4542 BIOCRYST PHARMACEUTICALS 100 0 0.00% Put
4543 COMMUNITY HEALTH SYS INC NEW RIGHT 99/99/9999 36,212 0 0.00%
4544 DENISON MINES CORP 141 0 0.00%
4545 CLEVELAND BIOLABS INC 68 0 0.00%
4546 REALNETWORKS INC 100 0 0.00% Call
4547 ASSEMBLY BIOSCIENCES INC 1 0 0.00%
4548 SMART TECHNOLOGIES INC 1 0 0.00%
Page 91 of 91

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-16-000021, filed 2016.05.12).

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.