X0508 4 2025-12-16 0001943896 Rubrik, Inc. RBRK 0002019143 Nithrakashyap Arvind C/O RUBRIK INC. 3495 DEER CREEK ROAD PALO ALTO CA 94304 true true false false Chief Technology Officer 0 Class A Common Stock 2025-12-16 4 C 0 40625 0 A 374153 D Class A Common Stock 2025-12-17 4 S 0 31450 76.19 D 342703 D Restricted Stock Unit 2025-12-16 4 M 0 40625 0 D 2029-08-07 Class B Common Stock 40625 40625 D Class B Common Stock 2025-12-16 4 M 0 40625 0 A Class A Common Stock 40625 10371570 D Class B Common Stock 2025-12-16 4 C 0 40625 0 D Class A Common Stock 40625 10330945 D Class B Common Stock Class A Common Stock 200000 200000 I By Arvind Nithrakashyap, as Trustee of the Nithrakashyap/Chatterjee Revocable Trust 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 shares of Class B Common Stock are to be acquired upon the vesting of an RSU award previously granted to the Reporting Person. The RSUs shall vest as follows: 1/16 of the shares subject to the RSU vest in sixteen equal quarterly installments measured from January 27, 2022 and the Issuer's achievement of a specified average price per share prior to the earlier of (i) the five year anniversary of the effectiveness of the registration statement on Form S-1 filed by the Issuer in connection with the Issuer's initial public offering and (ii) the expiration of the RSU award, 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) as a full time employee of the Issuer on each such 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 is also convertible at any time at the option of the Reporting Person into one share of Class A Common Stock. The shares are held of record by Arvind Nithrakashyap, as Trustee of the Nithrakashyap/Chatterjee Revocable Trust, for which the Reporting Person serves as trustee and shares voting and dispositive power with his spouse. /s/ Larry Guo, Attorney-in-Fact 2025-12-18