MongoDB, Inc.

Rule 10b5-1 and Non-Rule 10b5-1 Trading Arrangements

Certain executive officers and directors of the Company may execute purchases and sales of the Company's common stock through Rule 10b5-1 equity trading plans and “non-Rule 10b5-1 equity trading arrangements” (as defined in Item 408(c) of Regulation S-K).

During the three months ended October 31, 2025, one of our executive officers and one of our board of directors engaged in the following Rule 10b5-1 trading arrangements:

On August 27, 2025, Cedric Pech, our President of Field Operations, terminated a previously disclosed trading plan intended to satisfy the conditions under Rule 10b5-1(c) of the Exchange Act, and which had been entered into on June 18, 2025. The terminated plan provided for the potential sale of up to 100% of the (net) shares of common stock resulting from the vesting of an aggregate of 48,196 RSUs and PSUs in amounts and prices determined in accordance with a formula set forth in the plan (net shares are net of tax withholding) over a period scheduled to end on the earlier of (i) the date that all the shares under the plan were sold and (ii) June 18, 2026, subject to early termination for certain specified events set forth in the plan. No further transactions will occur under the terminated plan.

On September 16, 2025, Hope Cochran, amember of our board of directors, adopted a trading plan intended to satisfy the conditions under Rule 10b5-1(c) of the Exchange Act. Ms. Cochran’s plan is for the sale of up to 4,698 shares of common stock underlying stock options and 4,000 shares of common stock, in amounts and prices determined in accordance with a formula set forth in the plan and terminates on the earlier of (i) the date that all the shares under the plan are sold and (ii)September 30, 2026, subject to early termination for certain specified events set forth in the plan.

During the three months ended October 31, 2025, other than noted above, none of our executive officers or directors terminated or modified a 10b5-1 equity trading plan, oradopted, terminated, or modified any “non-Rule 10b5-1 equity trading arrangement.

Chief Accounting Officer Transition

On December 1, 2025, Thomas Bull, the Company’s Chief Accounting Officer, announced his resignation from the Company, effective February 27, 2026.