BLACKLINE, INC. — Director's Dealing 2026

Feb 24, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BLACKLINE, INC. (BL)
CIK: 0001666134
Period of Report: 2026-02-20

Reporting Person: Tucker Therese (Director, Founder)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-20	Common Stock	M	21761	$36.15	Acquired	372889	Direct
2026-02-20	Common Stock	M	9332	$36.15	Acquired	382221	Direct
2026-02-20	Common Stock	M	11225	$36.15	Acquired	393446	Direct
2026-02-20	Common Stock	F	31786	$36.15	Disposed	361660	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	100178	Indirect
Common Stock	1509881	Indirect
Common Stock	54074	Indirect
Common Stock	577200	Indirect
Common Stock	577200	Indirect
Common Stock	52444	Indirect
Common Stock	874128	Indirect
Common Stock	129897	Indirect
Common Stock	250916	Indirect

Footnotes

F1: The reported shares relate to the portion of a Performance Based Restricted Stock Unit ("PRSU") granted on March 7, 2023 that has vested based on the Issuer's achievement of certain fiscal 2023 performance targets that were set by the Compensation Committee at the time of grant.

F2: The reported shares relate to the portion of a PRSU granted on March 17, 2024 that has vested based on the Issuer's achievement of certain fiscal 2024 performance targets that were set by the Compensation Committee at the time of grant.

F3: The reported shares relate to the portion of a PRSU granted on April 2, 2025 that has vested based on the Issuer's achievement of certain fiscal 2025 performance targets that were set by the Compensation Committee at the time of grant.

F4: The reported shares were withheld to cover the reporting person's tax liability in connection with the vesting of PRSUs and restricted stock units.