144 0002020220 XXXXXXXX LIVE 0001943896 Rubrik, Inc. 001-42028 3495 DEER CREEK ROAD PALO ALTO CA 94304 844-478-2745 Choudary Kiran Kumar Officer Class A Common Stock Morgan Stanley Smith Barney LLC

1 New York Plaza 39th Floor New York NY 10004

51632 1627440.64 69118119 09/26/2024 NYSE Class A Common Stock 09/26/2024 Restricted Stock Units vesting under a registered plan Issuer N 51632 09/26/2024 Compensation Y This is a sell-to-cover transaction for taxes owed related to recent vestings of stock unit awards granted by the issuer. 09/27/2024 /s/ Kiran Kumar Choudary