BLACKLINE, INC. — Director's Dealing 2021

May 21, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BLACKLINE, INC. (BL)
CIK: 0001666134
Period of Report: 2021-05-18

Reporting Person: Tucker Therese (Director, Executive Chair)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-18	Common Stock	S	700	$101.8857	Disposed	2197782	Indirect
2021-05-18	Common Stock	S	700	$103.2621	Disposed	2197082	Indirect
2021-05-18	Common Stock	S	4014	$103.7204	Disposed	2193068	Indirect
2021-05-18	Common Stock	S	4586	$104.6222	Disposed	2188482	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	172379	Direct
Common Stock	874128	Indirect
Common Stock	577200	Indirect
Common Stock	577200	Indirect
Common Stock	250916	Indirect
Common Stock	54074	Indirect

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 November 27, 2020.

F2: The sale price represents the weighted-average price of shares sold ranging from $101.39 to $102.31 per share. Upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

F3: The sale price represents the weighted-average price of shares sold ranging from $102.98 to $103.325 per share. Upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

F4: The sale price represents the weighted-average price of shares sold ranging from $103.445 to $104.175 per share. Upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

F5: The sale price represents the weighted-average price of shares sold ranging from $104.435 to $104.81 per share. Upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.