Company: BL
Filing Date: 2025-02-21
Form Type: S-8
Source: 0001193125-25-032083
Chunk: 7

Company: BLACKLINE, INC.
Filing Date: 2025-02-21
Form: S-8
Chunk 7
---
 by a director, officer or controlling person of the Registrant in the 
 successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been       
 settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue. |

-4-

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Woodland Hills, State of California, on February 21, 2025.

| BLACKLINE, INC. |     |                            |
| By:             |     | /s/ Therese Tucker         |
| Name:           |     | Therese Tucker             |
| Title:          |     | Co-Chief Executive Officer |
| By:             |     | /s/ Owen Ryan              |
| Name:           |     | Owen Ryan                  |
| Title:          |     | Co-Chief Executive Officer |

POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Therese Tucker, Owen Ryan and Mark Partin, and each of them, as such individual’s true and lawful attorney in fact and agent with full power of substitution, for such individual in any and all capacities, to sign any and all amendments to this Registration Statement on Form S-8(including post-effective amendments), and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney in fact, proxy and agent full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully for all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorney in fact, proxy and agent, or the individual’s substitute, may lawfully do or cause to be done by virtue hereof. Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement on Form S