X0306 4 2023-03-07 0 0001666134 BLACKLINE, INC. BL 0001688366 Partin Mark 21300 VICTORY BLVD 12TH FLOOR WOODLAND HILLS CA 91367 0 1 0 0 Chief Financial Officer Common Stock 2023-03-07 4 A 0 34940 0.00 A 199479 D 25% of the Restricted Stock Units will vest on the one (1) year anniversary of February 20, 2023 (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 applicable individual remaining a Service Provider through each applicable vesting date. /s/ Karole Morgan-Prager, Attorney-in-Fact 2023-03-07