GROUP ONE TRADING LLC

Position in BL — Blackline, Inc.

CIK 932540 CHICAGO, IL

Position in BL

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$6,477,994

+$6,440,878 QoQ

Shares Held

230,780

+32915.7% QoQ

Ownership

0.397%

of shares outstanding

% of Portfolio

0.22%

of 13F equity value

Holder Rank

#46

of 244 holders

Holding Since

Mar 2020

14 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Technology · as of Jun 30, 2026

GROUP ONE TRADING LLC holds $130,925,131 across 87 Software - Application names. BL ranks #7 (4.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	MSTR	Strategy Inc	220,929	$19,205,357
2	SHOP	Shopify Inc.	112,530	$12,848,675
3	U	Unity Software Inc.	355,514	$10,160,590
4	UBER	Uber Technologies, Inc	129,875	$9,371,780
5	ADBE	Adobe Inc.	39,832	$8,166,356
6	CDNS	Cadence Design Systems Inc	21,083	$7,912,871
7	BL	Blackline, Inc. This page	230,780	$6,477,994
8	HUBS	Hubspot Inc	34,715	$6,335,834

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$6,477,994	230,780	+32915.7%	Shares	Sole	2026-08-14
2025-09-30	$37,116	699	+35.5%	Shares	Sole	2025-11-12
2025-06-30	$29,215	516	+29.0%	Shares	Sole	2025-08-14
2025-03-31	$19,368	400	-85.6%	Shares	Sole	2025-05-14
2024-06-30	$134,158	2,769	+241.0%	Shares	Sole	2024-08-14
2024-03-31	$52,438	812	+62.4%	Shares	Sole	2024-05-10
2023-12-31	$31,220	500	-53.1%	Shares	Sole	2024-02-14
2023-09-30	$59,131	1,066	-91.8%	Shares	Sole	2023-11-09
2022-12-31	$878,075	13,053	+100307.7%	Shares	Sole	2023-02-09
2022-09-30	$778	13	-98.8%	Shares	Sole	2022-11-09
2022-03-31	$78,638	1,074	+18.4%	Shares	Sole	2022-05-12
2020-09-30	$81,294	907	-84.4%	Shares	Sole	2020-11-12
2020-06-30	$482,536	5,820	+76.3%	Shares	Sole	2020-08-13
2020-03-31	$173,665	3,301	—	Shares	Sole	2020-05-13
No filing history on record for this holder in this stock.