Effective January 1, 2023, the Board of Directors (the “Board”) of BlackLine, Inc. (the “Company”) appointed Brunilda Rios and Amit Yoran to serve as members of the Board, effective immediately. Ms. Rios will serve in the class of directors whose term expires at the annual meeting of stockholders to be held in 2025, and Mr. Yoran will serve in the class of directors whose term expires at the annual meeting of stockholders to be held in 2024. Ms. Rios will join the Audit Committee of the Board (the “Audit Committee”) and Mr. Yoran will join the Compensation Committee of the Board (the “Compensation Committee”).

Ms. Rios has served as Chief Accounting Officer (CAO) of Dell Technologies (“Dell”) since 2020. and since 2018, she has served as SVP of Global Revenue of Dell. She previously served as VP of Corporate Accounting at Dell from 2016 to 2018, during which time she helped oversee the merger of Dell and EMC Corporation.

She has served in various finance and accounting roles at Dell since 2000. Ms. Rios holds a B.S. in Accounting and Finance from Universidad de Puerto Rico. Mr. Yoran has served as CEO and Chairman of Tenable since 2017.

Prior to Tenable, Mr. Yoran served as President of RSA Security from 2014 to 2016 and SVP, Product from 2011 to 2014. He joined RSA Security through its acquisition of NetWitness, a network forensics company he founded and led as CEO from 2006 to 2011. Prior to NetWitness, Mr. Yoran served as founding director of the United States Computer Emergency Readiness Team (US-CERT) program in the U.S. Department of Homeland Security.

Mr. Yoran holds a B.S. in Computer Science from the United States Military Academy at West Point and an M.S. in Computer Science from George Washington University. In addition, effective January 1, 2023, Therese Tucker transitioned from her role as executive chair of the Company's Board, and Owen Ryan, who had been serving as lead independent director of the Board, assumed the role of chair of the Board. Ms. Tucker will continue to serve as a member of the Board and as an employee of the Company.