GROUP ONE TRADING LLC Q1 2021 Filing

Filed May 12, 2021

Portfolio Value

$67.5M

Holdings

7,548

Report Date

Q1 2021

Filing Type

13F-HR

All Holdings (7,548 positions)

#	Stock	Shares	Value	% Portfolio	Type
6501	TRUPTRUPANION INC	400	$30K	0.04%	Put
6502	—ESSENTIAL PPTYS RLTY TR INC	1,300	$30K	0.04%	Call
6503	INVAINNOVIVA INC	2,500	$30K	0.04%	Call
6504	—FIESTA RESTAURANT GROUP INC	2,400	$30K	0.04%	Call
6505	—SYNEOS HEALTH INC	400	$30K	0.04%	Call
6506	—ADAPTIMMUNE THERAPEUTICS PLC	5,700	$30K	0.04%	Put
6507	WTWWILLIS TOWERS WATSON PLC LTD	12,700	$29K	0.04%	Call
6508	NTCOYNATURA &CO HLDG S A	1,700	$29K	0.04%
6509	WVEWAVE LIFE SCIENCES LTD	5,200	$29K	0.04%	Call
6510	KROKRONOS WORLDWIDE INC	1,903	$29K	0.04%
6511	—BOQII HLDG LTD	5,200	$29K	0.04%	Put
6512	CPSHCPS TECHNOLOGIES CORP	2,200	$29K	0.04%	Put
6513	—GORES HOLDINGS VI INC	2,100	$29K	0.04%	Put
6514	—FOCUS FINL PARTNERS INC	700	$29K	0.04%	Put
6515	EVEREVERQUOTE INC	800	$29K	0.04%	Call
6516	DRDDRDGOLD LIMITED	3,100	$29K	0.04%	Call
6517	CMPSCOMPASS PATHWAYS PLC	800	$29K	0.04%	Put
6518	—CROSS CTRY HEALTHCARE INC	2,300	$29K	0.04%	Call
6519	AHCOADAPTHEALTH CORP	800	$29K	0.04%	Put
6520	DLTHDULUTH HLDGS INC	1,700	$29K	0.04%	Call
6521	—PERDOCEO ED CORP	2,400	$29K	0.04%	Put
6522	ITWOPROSHARES TR II	4,100	$29K	0.04%	Put
6523	—CAPSTEAD MTG CORP	4,590	$29K	0.04%
6524	—EVOKE PHARMA INC	16,101	$29K	0.04%
6525	TCPCBLACKROCK TCP CAPITAL CORP	200	$28K	0.04%	Call
6526	—AMERICAN VRTUAL CLOUD TECH I	5,000	$28K	0.04%	Put
6527	SBACSBA COMMUNICATIONS CORP NEW	100	$28K	0.04%	Call
6528	07SSECUREWORKS CORP	2,086	$28K	0.04%
6529	—GENOCEA BIOSCIENCES INC	10,200	$28K	0.04%	Call
6530	PLABPHOTRONICS INC	2,200	$28K	0.04%	Put
6531	TGNATEGNA INC	1,500	$28K	0.04%	Put
6532	—CRANE CO	300	$28K	0.04%	Put
6533	—NEVRO CORP	200	$28K	0.04%	Put
6534	HLXHELIX ENERGY SOLUTIONS GRP I	5,600	$28K	0.04%	Put
6535	—ADTRAN INC	1,700	$28K	0.04%	Call
6536	INVAINNOVIVA INC	2,334	$28K	0.04%
6537	BKCCUSDBLACKROCK CAP INVT CORP	8,396	$28K	0.04%
6538	OPYOPPENHEIMER HLDGS INC	700	$28K	0.04%	Put
6539	GBDCGOLUB CAP BDC INC	1,900	$28K	0.04%	Call
6540	—PARAMOUNT GROUP INC	2,800	$28K	0.04%	Put
6541	—HARPOON THERAPEUTICS INC	1,345	$28K	0.04%
6542	HRTGHERITAGE INS HLDGS INC	2,500	$28K	0.04%
6543	ASPSALTISOURCE PORTFOLIO SOLNS S	3,100	$28K	0.04%	Call
6544	—OCEAN PWR TECHNOLOGIES INC	8,500	$28K	0.04%	Put
6545	WALWESTERN ALLIANCE BANCORP	300	$28K	0.04%	Put
6546	FANHFANHUA INC	2,000	$28K	0.04%
6547	RKDAARCADIA BIOSCIENCES INC	10,100	$28K	0.04%	Put
6548	IRTINDEPENDENCE RLTY TR INC	1,824	$28K	0.04%
6549	—AUTOWEB INC	10,365	$28K	0.04%
6550	2JEFOCUS FINL PARTNERS INC	663	$28K	0.04%
6551	—LA JOLLA PHARMACEUTICAL CO	6,632	$28K	0.04%
6552	DCTDUCK CREEK TECHNOLOGIES INC	600	$27K	0.04%
6553	GDYNGRID DYNAMICS HLDGS INC	1,700	$27K	0.04%	Call
6554	KBRKBR INC	700	$27K	0.04%	Put
6555	SGRYSURGERY PARTNERS INC	600	$27K	0.04%	Call
6556	EKSOEUREKSO BIONICS HLDGS INC	4,316	$27K	0.04%
6557	TXTERNIUM SA	700	$27K	0.04%	Put
6558	SVASINOVAC BIOTECH LTD	412	$27K	0.04%
6559	—AGILE THERAPEUTICS INC	13,046	$27K	0.04%
6560	—GORES HOLDINGS VI INC	1,943	$27K	0.04%
6561	—EIGER BIOPHARMACEUTICALS INC	3,100	$27K	0.04%	Put
6562	VGREURVECTOR GROUP LTD	1,940	$27K	0.04%
6563	VCYTVERACYTE INC	504	$27K	0.04%
6564	INGRINGREDION INC	300	$27K	0.04%	Call
6565	OPCHOPTION CARE HEALTH INC	1,500	$27K	0.04%	Put
6566	—COOPER TIRE & RUBR CO	475	$27K	0.04%
6567	REFRRESEARCH FRONTIERS INC	9,574	$27K	0.04%
6568	—F N B CORP	2,100	$27K	0.04%	Call
6569	—VECTOR GROUP LTD	1,900	$27K	0.04%	Put
6570	—AVID TECHNOLOGY INC	1,300	$27K	0.04%	Call
6571	—DOMTAR CORP	700	$26K	0.04%	Call
6572	APAMARTISAN PARTNERS ASSET MGMT	500	$26K	0.04%	Put
6573	1T7TRICIDA INC	4,965	$26K	0.04%
6574	HAYNUSDHAYNES INTERNATIONAL INC	868	$26K	0.04%
6575	RCMTRCM TECHNOLOGIES INC	7,400	$26K	0.04%	Call
6576	—TITAN PHARMACEUTICALS INC DE	8,700	$26K	0.04%	Call
6577	—AMEDISYS INC	100	$26K	0.04%	Put
6578	SIEBSIEBERT FINL CORP	6,500	$26K	0.04%	Call
6579	CHRDOASIS PETROLEUM INC	440	$26K	0.04%
6580	ABCBAMERIS BANCORP	500	$26K	0.04%	Call
6581	—QUOTIENT LTD	7,019	$26K	0.04%
6582	—LABORATORY CORP AMER HLDGS	100	$26K	0.04%	Put
6583	RYAAYRYANAIR HOLDINGS PLC	227	$26K	0.04%
6584	—LIBERTY GLOBAL PLC	1,000	$26K	0.04%	Put
6585	CCEPCOCA COLA EUROPEAN PARTNERS	500	$26K	0.04%	Put
6586	9KGNEXTIER OILFIELD SOLUTIONS	6,898	$26K	0.04%
6587	—TILLYS INC	2,300	$26K	0.04%	Put
6588	STCSTEWART INFORMATION SVCS COR	500	$26K	0.04%	Put
6589	VRTVERTIV HOLDINGS CO	1,300	$26K	0.04%	Put
6590	—BLUEKNIGHT ENERGY PARTNERS L	8,000	$26K	0.04%	Put
6591	WCCWESCO INTL INC	300	$26K	0.04%	Put
6592	GRFSGRIFOLS S A	1,500	$26K	0.04%	Put
6593	—EPIZYME INC	3,000	$26K	0.04%	Put
6594	—CHIMERIX INC	2,700	$26K	0.04%	Call
6595	—TREEHOUSE FOODS INC	500	$26K	0.04%	Put
6596	GKOSGLAUKOS CORP	300	$25K	0.04%	Put
6597	—UNITED STS GASOLINE FD LP	800	$25K	0.04%	Put
6598	IVPEFISHARES INC	1,000	$25K	0.04%	Call
6599	CMTLCOMTECH TELECOMMUNICATIONS C	1,000	$25K	0.04%
6600	KLICKULICKE & SOFFA INDS INC	500	$25K	0.04%	Put

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