BLACKLINE, INC. — Director's Dealing 2021

May 17, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BLACKLINE, INC. (BL)
CIK: 0001666134
Period of Report: 2021-05-13

Reporting Person: SMITH GRAHAM (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-13	Common Stock	M	2500	$14.50	Acquired	11359	Direct
2021-05-13	Common Stock	S	2500	$102.75	Disposed	8859	Direct
2021-05-13	Common Stock	A	1847	$0.00	Acquired	10706	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-13	Stock Option (right to buy)	$14.50	M	2500	Disposed	2025-05-19	Common Stock (2500)	Direct

Footnotes

F1: The sale transaction reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 12, 2021.

F2: Reflects automatic annual restricted stock unit ("RSU") awards pursuant to the Issuer's Outside Director Compensation Policy.

F3: The reported securities awarded on May 13, 2021 (the "Award Date") represent RSUs which vest in full upon the earlier of the one (1) year anniversary of the Award Date or the day prior to the Issuer's next annual meeting of the stockholders and in each case subject to the Reporting Person's continued service on the Issuer's board of directors through each vesting date.

F4: The original option was granted for 100,000 shares and has been partially exercised. The shares subject to the original option vest in 4 equal, annual installments beginning on the one year anniversary of May 20, 2015.