TUCKER THERESE (Chief Executive Officer) sold 15.5% of their position (70K shares) of BLACKLINE, INC. on the open market

Open‑market sale worth $2.24M — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

TUCKER THERESE

Filed: 8/26/2026ACC: 0001666134-26-000100

InsiderTUCKER THERESECIK 1688365

→

IssuerBLACKLINE, INC.CIK 1666134

DirectorOfficer· Chief Executive Officer

Since Aug 2018

-70K

Net shares

Net seller

$2.24M

Total sold

Open market trades

0B · 1S

Total transactions

96.56K acquired · 166.56K disposed

Non-Derivative Transactions3

Common Stock

Direct

M · Option Exercise

+70K

Price / share

$14.00

Trade value

$980K

% of position

19.7%

8/24/2026

355K→425K

Common Stock

Direct

M · Option Exercise

+26.56K

Price / share

$14.00

Trade value

$371.84K

% of position

6.2%

8/24/2026

425K→451.56K

Common Stock

Direct

S · Sale

−70K

Price / share

$31.96

Trade value

$2.24M

% of position

15.5%

8/24/2026

451.56K→381.56K

Total

Net shares

+26.56K

Net value

-$885.15K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	8/24/2026	M · Option Exercise	+70K	$14.00	$980K	19.7%	355K	425K
Common Stock Direct	8/24/2026	M · Option Exercise	+26.56K	$14.00	$371.84K	6.2%	425K	451.56K
Common Stock Direct	8/24/2026	S · Sale	−70K	$31.96	$2.24M	15.5%	451.56K	381.56K
Total			+26.56K		-$885.15K

Derivative Transactions2

Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

70K shares

−70K

Strike price

14.00

Held after

26.56K

Exercisable

—

8/24/2026

Stock Option (Right to Buy)

Direct

M · Option Exercise

Converts to

Common Stock

26.56K shares

−26.56K

Strike price

14.00

Held after

0.00

Exercisable

—

8/24/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (Right to Buy) Direct	Common Stock70K shares	8/24/2026	M · Option Exercise	−70K	14.00	—	26.56K
Stock Option (Right to Buy) Direct	Common Stock26.56K shares	8/24/2026	M · Option Exercise	−26.56K	14.00	—	0.00

Non-Derivative Holdings (Post-Transaction)9

Common Stock

Indirect

Shares owned1.51M

Common Stock

Indirect

Shares owned100.18K

Common Stock

Indirect

Shares owned577.20K

Common Stock

Indirect

Shares owned129.90K

Common Stock

Indirect

Shares owned54.07K

Common Stock

Indirect

Shares owned577.20K

Common Stock

Indirect

Shares owned52.44K

Common Stock

Indirect

Shares owned874.13K

Common Stock

Indirect

Shares owned250.92K

Total

4.13M indirect4.13M

Security Title	Shares Owned	Ownership Type
Common Stock	1.51M	Indirect
Common Stock	100.18K	Indirect
Common Stock	577.20K	Indirect
Common Stock	129.90K	Indirect
Common Stock	54.07K	Indirect
Common Stock	577.20K	Indirect
Common Stock	52.44K	Indirect
Common Stock	874.13K	Indirect
Common Stock	250.92K	Indirect
Total	4.13M	4.13M indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported