X0508 4 2024-05-08 0001666134 BLACKLINE, INC. BL 0001447252 Duan Jimmy C 21300 VICTORY BLVD STE 12 WOODLAND HILLS CA 91367 1 Chief Customer Officer 0 Common Stock 2024-05-08 4 A 0 48360 0 A 48360 D Each share is represented by a Restricted Stock Unit ("RSU"). 25% of the Restricted Stock Units will vest on the one (1) year anniversary of May 20, 2024 (the "RSU Vesting Commencement Date"), and 1/16th of the Restricted Stock Units will vest every three months thereafter on the same day of the month as the RSU Vesting Commencement Date, subject to the Reporting Person's continued service through each applicable vesting date. /s/ Karole Morgan-Prager, Attorney-in-Fact 2024-05-10