X0609 4 2026-05-07 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 2026-05-07 4 S 0 2000 290.06 D 1003316 D Common Stock 476896 I By Trust Common Stock 79262 I Dwight A. Merriman Charitable Foundation 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/ Paul Johnston, Attorney-in-Fact 2026-05-11