Amendment: SEC Form SCHEDULE 13G/A filed by Rubrik Inc.

c/o Lightspeed Venture Partners 2200 Sand Hill Road Menlo Park, CA 94025

Lightspeed IX Cayman Islands LGP IX Cayman Islands LUGP IX Cayman Islands Lightspeed SPV I Delaware Lightspeed SPV I-B Delaware Lightspeed SPV I-C Delaware LS SPV Delaware Lightspeed Select II Cayman Islands LGP Select II Cayman Islands LUGP Select II Cayman Islands Lightspeed X Cayman Islands Lightspeed Affiliates X Cayman Islands LGP X Cayman Islands LUGP X Cayman Islands LMC Delaware Eggers United States Mhatre United States Nieh United States

Row 9 of each Reporting Person's cover page to this Schedule 13G sets forth the aggregate number of shares of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. The Reporting Persons' ownership of the Issuer's securities consists of (i) 9,989,816 shares of Class B common stock directly held by Lightspeed IX; (ii) 4,511,457 shares of Class B common stock directly held by Lightspeed SPV I; (iii) 3,247,511 shares of Class B common stock directly held by Lightspeed SPV I-B; (iv) 2,273,358 shares of Class B common stock directly held by Lightspeed SPV I-C; (v) 2,319,410 shares of Class B common stock directly held by Lightspeed Select II; (vi) 101,659 shares of Class B common stock held by Lightspeed X; (vii) 13,213 shares of Class A common stock directly held by LMC; (viii) 210,500 shares of Class A common stock held by Eggers; (ix) 327,853 shares of Class A common stock held by Mhatre; and (x) 310,499 shares of Class A common stock held by Nieh. LUGP IX serves as the sole general partner of LGP IX, which serves as the sole general partner of Lightspeed IX; LS SPV serves as the manager of each of Lightspeed SPV I, Lightspeed SPV I-B and Lightspeed SPV I-C; LUGP Select II serves as the sole general partner of LGP Select II, which serves as the sole general partner of Lightspeed Select II; and LUGP X serves as the sole general partner of LGP X, which serves as the sole general partner of each of Lightspeed X and Lightspeed Affiliates X. Eggers, Mhatre and Nieh are directors of each of LGP IX, LUGP Select II and LUGP X and the managing members of each of LS SPV and LMC and share voting and dispositive power over the shares held by the foregoing entities.

Row 11 of each Reporting Person's cover page to this Schedule 13G sets forth the percentages of the securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference. The percentage set forth in each Row 11 is based upon 103,167,994 shares of the Issuer's Class A common stock outstanding as of February 28, 2025, as reported in the Issuer's Annual Report on Form 10-K filed with the Securities and Exchange Commission (the "SEC") on March 20, 2025, in each case, adjusted in accordance with rules of the SEC, to give effect to the full conversion of Class B common stock beneficially owned by such Reporting Person.

Row 5 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference.

Row 6 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to vote or to direct the vote of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference.

Row 7 of each Reporting Person's cover page to this Schedule 13G sets forth the sole power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference.

Row 8 of each Reporting Person's cover page to this Schedule 13G sets forth the shared power to dispose or to direct the disposition of securities of the Issuer beneficially owned by such Reporting Person as of March 31, 2025 and is incorporated by reference.