X0609 4 2026-06-02 0001441816 MongoDB, Inc. MDB 0001222287 BOTHA ROELOF false C/O SEQUOIA CAPITAL 2800 SAND HILL ROAD, SUITE 101 MENLO PARK CA 94025 1 0 0 0 0 Common Stock 2026-06-02 4 S 0 680 395.4847 D 193920 I By Estate Planning Vehicles Common Stock 2026-06-02 4 S 0 4225 397.2530 D 189695 I By Estate Planning Vehicles Common Stock 2026-06-02 4 S 0 28889 397.9913 D 160806 I By Estate Planning Vehicles Common Stock 2026-06-02 4 S 0 9856 398.7399 D 150950 I By Estate Planning Vehicles Common Stock 2026-06-02 4 S 0 400 399.8200 D 150550 I By Estate Planning Vehicles Common Stock 1130 D The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $395.20 to $396.04, inclusive. The Reporting Person undertakes to provide to the Company, any security holder of the Company or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $396.50 to $397.495, inclusive. The Reporting Person undertakes to provide to the Company, any security holder of the Company or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $397.50 to $398.49, inclusive. The Reporting Person undertakes to provide to the Company, any security holder of the Company or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $398.51 to $399.47, inclusive. The Reporting Person undertakes to provide to the Company, any security holder of the Company or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $399.65 to $399.92, inclusive. The Reporting Person undertakes to provide to the Company, any security holder of the Company or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. /s/ Jung Yeon Son, Attorney-in-Fact 2026-06-04