X0508 4 2025-12-16 0001943896 Rubrik, Inc. RBRK 0002020217 McCarthy Brian K. C/O RUBRIK INC. 3495 DEER CREEK ROAD PALO ALTO CA 94304 false true false false Pres.,Global Sales & Field Ops 0 Class A Common Stock 2025-12-16 4 C 0 6250 0 A 345569 D Class A Common Stock 2025-12-17 4 S 0 2851 76.18 D 342718 D Class A Common Stock 2025-12-17 4 S 0 1946 76.19 D 340772 D Restricted Stock Units 2025-12-16 4 M 0 6250 0 D 2029-04-13 Class B Common Stock 6250 6250 D Class B Common Stock 2025-12-16 4 M 0 6250 A Class A Common Stock 6250 6250 D Class B Common Stock 2025-12-16 4 C 0 6250 D Class A Common Stock 6250 0 D This sale reported on this Form 4 was effected pursuant to the Issuer's policy requiring sell-to-cover to satisfy certain tax obligations of the Reporting Person incurred with the vesting and settlement of certain Restricted Stock Units (RSUs). Each RSU represents a contingent right to receive one share of Class B Common Stock. The RSUs shall vest as follows: 1/16 of the shares subject to the RSU vested on June 15, 2022, and 1/16 of the shares subject to the RSU vest every quarter thereafter, and a liquidity event-based vesting condition which was satisfied upon the effectiveness of the registration statement on Form S-1 filed by the Issuer in connection with the Issuer's initial public offering, all subject to the Reporting Person continuing to have a Service Relationship (as defined in the Issuer's Amended and Restated 2014 Stock Option and Grant Plan). Each share of Class B Common Stock held by the Reporting Person will automatically convert into one share of Class A Common Stock upon the sale or transfer of such share of Class B Common Stock, subject to certain exceptions, and in certain other circumstances described in the Issuer's amended and restated certificate of incorporation. Each share of Class B Common Stock will also be convertible at any time at the option of the Reporting Person into one share of Class A Common Stock. /s/ Larry Guo, Attorney-in-Fact 2025-12-18