X0609 4 2026-06-30 0 0001441816 MongoDB, Inc. MDB 0001237858 MERRIMAN DWIGHT A false C/O MONGODB, INC. 1633 BROADWAY, 38TH FLOOR NEW YORK NY 10019 1 0 0 0 1 Common Stock 2026-06-30 4 A 0 767 0 A 984083 D Common Stock 2026-06-30 4 S 0 1130 334.25 D 982953 D Common Stock 464896 I By Trust Common Stock 79262 I Dwight A. Merriman Charitable Foundation Represents restricted stock units issued to the Reporting Person pursuant to the annual equity grant under the Issuer's non-employee director compensation policy. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer and has no expiration date. The shares underlying the restricted stock unit award shall vest in full on the earlier of (i) the first anniversary of the grant date and (ii) the date of the Issuer's 2027 annual stockholders' meeting, subject to the Reporting Person providing continuous service to the Issuer through such date. The transactions were pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. These shares are held by The Dwight A. Merriman 2012 Trust for the benefit of the Reporting Person's children. The Dwight A. Merriman Charitable Foundation is a Delaware nonstock nonprofit corporation. The Reporting Person is deemed to have voting and investment power over the shares of MongoDB, Inc. Common Stock held by the Dwight A. Merriman Charitable Foundation, but has no pecuniary interest in these shares. /s/ Gahee Lee, Attorney in Fact 2026-07-02