X0609 4 2026-06-03 0001943896 Rubrik, Inc. RBRK 0001707744 Wassenaar Yvonne false C/O RUBRIK INC. 3495 DEER CREEK ROAD PALO ALTO CA 94304 true false false false 1 Class A Common Stock 2026-06-03 4 C 0 721 0 A 3047 D Class A Common Stock 2026-06-03 4 S 0 721 80.73 D 2326 D Class A Common Stock 2026-06-03 4 A 0 3709 0 A 6035 D Class B Common Stock 2026-06-03 4 C 0 721 0 D Class A Common Stock 721 33116 D This sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan, adopted December 15, 2025. Represents the grant of restricted stock units ("RSUs") that will vest over a one-year period, in four (4) successive equal quarterly installments on each of September 15, 2026, December 15, 2026, March 15, 2027 and June 15, 2027, subject to the reporting person's continuous service with the Issuer on each such vest date. 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 and has no expiration date. /s/ Larry Guo, Attorney-in-Fact 2026-06-03