X0609 4 2026-10-05 0001943896 Rubrik, Inc. RBRK 0002019143 Nithrakashyap Arvind false C/O RUBRIK INC. 3495 DEER CREEK ROAD PALO ALTO CA 94304 true true false false Chief Technology Officer 1 Class A Common Stock 2026-10-05 4 C 0 2501 0 A 285358 D Class A Common Stock 2026-10-05 4 S 0 495 118.92 D 284863 D Class A Common Stock 2026-10-05 4 S 0 110 120.26 D 284753 D Class A Common Stock 2026-10-05 4 S 0 901 121.20 D 283852 D Class A Common Stock 2026-10-05 4 S 0 2801 121.95 D 281051 D Class A Common Stock 2026-10-05 4 S 0 5600 122.99 D 275451 D Class A Common Stock 2026-10-05 4 S 0 2913 123.80 D 272538 D Class A Common Stock 2026-10-06 4 C 0 12820 0 A 285358 D Class A Common Stock 2026-10-06 4 S 0 582 125.35 D 284776 D Class A Common Stock 2026-10-06 4 S 0 11101 126.14 D 273675 D Class A Common Stock 2026-10-06 4 S 0 1069 126.87 D 272606 D Class A Common Stock 2026-10-06 4 S 0 68 127.70 D 272538 D Class A Common Stock 2026-10-07 4 C 0 12820 0 A 285358 D Class A Common Stock 2026-10-07 4 S 0 1478 123.32 D 283880 D Class A Common Stock 2026-10-07 4 S 0 8274 124.05 D 275606 D Class A Common Stock 2026-10-07 4 S 0 3055 124.79 D 272551 D Class A Common Stock 2026-10-07 4 S 0 13 125.57 D 272538 D Class B Common Stock 2026-10-05 4 C 0 2501 0 D Class A Common Stock 2501 10025749 D Class B Common Stock 2026-10-06 4 C 0 12820 0 D Class A Common Stock 12820 10012929 D Class B Common Stock 2026-10-07 4 C 0 12820 0 D Class A Common Stock 12820 10000109 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 a Rule 10b5-1 trading plan, adopted October 15, 2025. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $118.48 to $119.47 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $120.065 to $120.425 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $120.54 to $121.4775 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $121.49 to $122.45 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.48 to $123.475 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.49 to $124.17 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.655 to $125.61 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $125.675 to $126.645 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $126.655 to $127.445 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $127.69 to $127.70 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $122.565 to $123.55 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $123.565 to $124.56 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $124.5725 to $125.535 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separated price within the range set forth in this footnote. 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 and has no expiration date. 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/ Anne-Kathrin Lalendran, Attorney-in-Fact 2026-10-07