MongoDB, Inc. — Director's Dealing 2025

Sep 25, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MongoDB, Inc. (MDB)
CIK: 0001441816
Period of Report: 2025-09-23

Reporting Person: Killalea Peter Thomas (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-09-23	Class A Common Stock	M	20000	$6.50	Acquired	52293	Direct
2025-09-23	Class A Common Stock	S	6003	$318.83	Disposed	46290	Direct
2025-09-23	Class A Common Stock	S	1925	$319.67	Disposed	44365	Direct
2025-09-23	Class A Common Stock	S	400	$320.60	Disposed	43965	Direct
2025-09-23	Class A Common Stock	S	1600	$322.28	Disposed	42365	Direct
2025-09-23	Class A Common Stock	S	4500	$323.34	Disposed	37865	Direct
2025-09-23	Class A Common Stock	S	3500	$324.36	Disposed	34365	Direct
2025-09-23	Class A Common Stock	S	1972	$325.23	Disposed	32393	Direct
2025-09-23	Class A Common Stock	S	100	$326.20	Disposed	32293	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-09-23	Stock Option (Right to Buy)	$6.50	M	20000	Disposed	2025-12-03	Class A Common Stock (20000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	5000	Indirect
Class A Common Stock	5000	Indirect
Class A Common Stock	5000	Indirect
Class A Common Stock	5000	Indirect

Footnotes

F1: The transactions were pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.

F2: The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $318.27 to $319.25, 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.

F3: The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $319.27 to $320.22, 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.

F4: The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $320.29 to $321.25, 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.

F5: The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $321.71 to $322.68, 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.

F6: The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $322.86 to $323.83, 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.

F7: The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $323.86 to $324.84, 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.

F8: The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $324.86 to $325.74, 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.

F9: The price reported is a weighted average price. The shares were sold in multiple transactions at prices ranging from $326.13 to $326.36, 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.

F10: These shares are held by the UAISLE Trust U/A DTD 11/15/2021 for the benefit of the Reporting Person's children.

F11: These shares are held by the CEANSA Trust U/A DTD 11/15/2021 for the benefit of the Reporting Person's children.

F12: These shares are held by the BREOGA Trust U/A DTD 11/15/2021 for the benefit of the Reporting Person's children.

F13: These shares are held by AOGALL Trust U/A DTD 11/15/2021 for the benefit of the Reporting Person's children.

F14: Immediately exercisable and fully vested.