X0609 4 2026-06-03 0001943896 Rubrik, Inc. RBRK 0001392138 Chandna Asheem false C/O GREYLOCK PARTNERS 2550 SAND HILL ROAD, SUITE 200 MENLO PARK CA 94025 true false false false 0 Class A Common Stock 2026-06-03 4 A 0 3709 0 A 6249 D Class A Common Stock 9296 I By Asheem Chandna and Aarti Chandna, trustees of the Chandna Children's Trust dated 12/23/2012 Class A Common Stock 1138098 I By The Revocable Trust of Asheem Chandna and Aarti Chandna, UDT 4/13/98 Class A Common Stock 345144 I By Greylock 16 Limited Partnership Class A Common Stock 12270 I By Greylock 16-A Limited Partnership Class A Common Stock 26076 I By Greylock 16 Principals Limited Partnership 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. Greylock 16 GP LLC ("Greylock 16 GP") is the sole general partner of each of Greylock 16 Limited Partnership ("Greylock 16"), Greylock 16-A Limited Partnership ("Greylock 16-A") and Greylock 16 Principals Limited Partnership ("Greylock 16 Principals") and may be deemed to share voting and dispositive voting power with respect to the shares held directly by Greylock 16, Greylock 16-A and Greylock 16 Principals. The Reporting Person is one of the managing members of Greylock 16 GP, and may be deemed to share voting and investment power over the shares held by Greylock 16, Greylock 16-A and Greylock 16 Principals. The Reporting Person disclaims beneficial ownership of these shares and this report shall not be deemed an admission that he is the beneficial owner of such shares, except to the extent of his pecuniary interest, if any. /s/ Larry Guo, Attorney-in-Fact 2026-06-05