X0508 4 2025-05-12 0001666134 BLACKLINE, INC. BL 0001603300 Stalick Michelle D 21300 VICTORY BLVD., 12TH FLOOR WOODLAND HILLS CA 91367 1 Chief Accounting Officer 0 Common Stock 2025-05-12 4 S 0 400 54.96 D 27565 D Includes 400 shares acquired on May 9, 2025, through the Issuer's Employee Stock Purchase Plan in a transaction that was exempt under both Rule 16b-3(d) and Rule 16b-3(c). /s/ Karole Morgan-Prager, Attorney-in-Fact 2025-05-13