Notice of Proposed Sale · 144

MongoDB, Inc.

MDBNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Nov 2, 2026Accepted Nov 2, 2026, 1:31 PM ESTFiling CIK 1441816Accession 0001957799-26-000191

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Structured filing — 144

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer: MongoDB, Inc.
Issuer CIK: 0001441816
SEC file number: 001-38240
Phone: 866-237-8815
Person for whose account securities are to be sold: MERRIMAN DWIGHT A
Relationships to issuer: Director
Street: 1633 BROADWAY
Street (continued): 38TH FLOOR
City: NEW YORK
State / country code: NY
Postal code: 10019

Securities proposed for sale

Securities proposed for sale · 3 reported rows
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Common	10,000	3,487,942.67	80,556,341	11/02/2026	NASDAQ	Wells Fargo Clearing Services
Common	3,000	1,050,505.91	80,556,341	11/02/2026	NASDAQ	Wells Fargo Clearing Services
Common	6,275	2,162,887.49	80,556,341	11/02/2026	NASDAQ	Wells Fargo Clearing Sevices

Broker / market maker — proposed row 1, entry 1

Name: Wells Fargo Clearing Services
Street: One North Jefferson Avenue
City: St. Louis
State / country code: MO
Postal code: 63103

Broker / market maker — proposed row 2, entry 1

Name: Wells Fargo Clearing Services
Street: One North Jefferson Avenue
City: St. Louis
State / country code: MO
Postal code: 63103

Broker / market maker — proposed row 3, entry 1

Name: Wells Fargo Clearing Sevices
Street: One North Jefferson Avenue
City: St. Louis
State / country code: MO
Postal code: 63103

Acquisition of securities to be sold

Acquisition of securities to be sold · 2 reported rows
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Donor acquired	Payment date	Nature of payment
Common	10/18/2017	Founders Shares	Issuer	13,000	N		10/18/2017	N/A
Common	12/20/2025	Gift	Dwight Merriman	6,275	Y	10/18/2017		N/A

Sales reported in the preceding three months

Sales reported in the preceding three months · 5 reported rows
Seller	Security	Sale date	Amount sold	Gross proceeds
Dwight Merriman	MongoDB, Inc.	08/14/2026	10,000	4,704,548.61
DAM 2012 Trust LLC	MongoDB, Inc.	08/17/2026	6,000	2,709,654.97
DAM 2012 Trust LLC	MongoDB, Inc.	10/08/2026	3,000	1,079,220.77
Dwight Merriman	MongoDB, Inc.	10/08/2026	10,000	3,598,428.05
DAM 2012 Trust LLC	MongoDB, Inc.	10/09/2026	1,000	376,835.23

Seller — prior-sale row 1, entry 1

Name: Dwight Merriman
Street: 1633 Broadway 38th, Floor
City: New York
State / country code: NY
Postal code: 10019

Seller — prior-sale row 2, entry 1

Name: DAM 2012 Trust LLC
Street: 1633 Broadway 38th, Floor
City: New York
State / country code: NY
Postal code: 10019

Seller — prior-sale row 3, entry 1

Name: DAM 2012 Trust LLC
Street: 1633 Broadway 38th, Floor
City: New York
State / country code: NY
Postal code: 10019

Seller — prior-sale row 4, entry 1

Name: Dwight Merriman
Street: 1633 Broadway 38th, Floor
City: New York
State / country code: NY
Postal code: 10019

Seller — prior-sale row 5, entry 1

Name: DAM 2012 Trust LLC
Street: 1633 Broadway 38th, Floor
City: New York
State / country code: NY
Postal code: 10019

Prior-sale reporting

Nothing to report for the preceding three months: N

Remarks

The 3,000 shares were sold from the DAM 2012 Trust LLC. The 6,275 shares were sold from the Dwight A Merriman Charitable Foundation.

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