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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 (2014Q4)
Original 13F HR (0000932540-15-000002) filed in 2015.02.11
#
Name
Shares
Value ($)
%
Options
Notes
501 MARRONE BIO INNOVATIONS INC 2,000 7 0.00% Put
502 FORTUNA SILVER MINES INC 1,500 7 0.00% Put
503 AMERICAN APPAREL INC 6,400 7 0.00% Put
504 SEMGROUP CORP 100 7 0.00% Call
505 SCORPIO BULKERS INC 3,500 7 0.00% Call
506 PARAGON SHIPPING INC-CLASS A 2,600 7 0.00% Call
507 GRIFOLS S A 200 7 0.00% Put
508 QLT INC 1,750 7 0.00%
509 XUNLEI LTD 1,000 7 0.00% Put
510 ORAMED 1,596 7 0.00%
511 ORANGE 436 7 0.00%
512 ALPHATEC HOLDINGS INC 5,000 7 0.00% Call
513 RTI SURGICAL INC 1,400 7 0.00% Put
514 CAMPUS CREST CMNTYS INC 1,000 7 0.00% Call
515 GTX INC DEL 10,000 7 0.00% Call
516 PHILLIPS 66 100 7 0.00% Call
517 COLGATE PALMOLIVE CO 100 7 0.00%
518 TESSERA TECHNOLOGIES INC 200 7 0.00% Put
519 ROSETTA GENOMICS LTD 3,312 7 0.00%
520 PETROQUEST ENERGY INC 1,800 7 0.00% Call
521 ALLIQUA BIOMEDICAL INC 1,388 7 0.00%
522 Smith Micro Software 6,699 7 0.00%
523 KARYOPHARM THERAPEUTICS INC 200 7 0.00% Call
524 MDU RES GROUP INC 300 7 0.00% Call
525 ECOPETROL S A 400 7 0.00% Call
526 SUPPORT COM INC 3,200 7 0.00% Call
527 ON ASSIGNMENT INC 200 7 0.00% Put
528 NAM TAI PPTY INC SHS 1,421 7 0.00%
529 TOWN SPORTS INTL HLDGS INC 1,100 7 0.00% Call
530 W & T OFFSHORE INC 900 7 0.00% Call
531 FIRST MARBLEHEAD CORP 1,109 7 0.00%
532 LILLY ELI & CO 100 7 0.00%
533 NEW SOURCE ENERGY PARTNERS L 1,000 7 0.00% Put
534 CYAN INC 2,905 7 0.00%
535 CHINA BAK BATTERY INC 4,000 7 0.00% Call
536 DORCHESTER MINERALS LP 256 7 0.00%
537 CENTERPOINT ENERGY INC 300 7 0.00%
538 RANDGOLD RES LTD 100 7 0.00%
539 ImmunoCellular Therapeutics Lt 9,032 7 0.00%
540 SENIOR HSG PPTYS TR 300 7 0.00% Put
541 RENTECH INC 5,412 7 0.00%
542 CNINSURE INC 1,000 7 0.00% Put
543 TILLYS INC CL A 700 7 0.00%
544 UNDER ARMOUR INC CL A 100 7 0.00% Put
545 FOREST OIL CORP 32,200 7 0.00% Put
546 Resolute Energy Corp 5,340 7 0.00%
547 SERVICENOW INC 98 7 0.00%
548 CLEARSIGN COMBUSTION CRP 1,000 7 0.00%
549 SEABRIDGE GOLD INC 1,036 8 0.00%
550 EMAGIN CORP 3,300 8 0.00% Put
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