144 0001207433 XXXXXXXX LIVE 0001943896 RUBRIK, INC. 001-42028 3495 DEER CREEK ROAD Palo Alto CA 94304 8444782745 JOHN THOMPSON Director Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

44000 3320680.00 151894462 01/05/2026 NYSE Common 01/05/2026 Exercise of Stock Options Issuer N 44000 01/05/2026 Cash N 10b5-1 Sales for JOHN AND SANDRA THOMPSON TRUST

3495 DEER CREEK ROAD Palo Alto CA 94304

Common 12/01/2025 9009 619377.76 10b5-1 Sales for JOHN AND SANDRA THOMPSON TRUST

3495 DEER CREEK ROAD Palo Alto CA 94304

Common 11/03/2025 9009 679708.33 The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. 01/05/2026 10/06/2025 /s/ John Thompson