Notice of Proposed Sale · 144

Datadog, Inc.

DDOGNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Aug 19, 2026Accepted Aug 19, 2026, 4:25 PM EDTFiling CIK 1561550Accession 0001950047-26-008400

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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: Datadog, Inc.
Issuer CIK: 0001561550
SEC file number: 001-39051
Phone: 8663294466
Person for whose account securities are to be sold: OLIVIER POMEL
Relationships to issuer: Director · Officer
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Securities proposed for sale

Securities proposed for sale · 1 reported row
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Class A Common	47,054	11,575,284.00	334,904,614	08/19/2026	NASDAQ	Morgan Stanley Smith Barney LLC Executive Financial Services

Broker / market maker — proposed row 1, entry 1

Name: Morgan Stanley Smith Barney LLC Executive Financial Services
Street: 1 New York Plaza
Street (continued): 8th Floor
City: New York
State / country code: NY
Postal code: 10004

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Payment date	Nature of payment
Class A Common	12/04/2023	Previously Exercised Stock Options	Issuer	47,054	N	12/04/2023	Cash

Sales reported in the preceding three months

Sales reported in the preceding three months · 10 reported rows
Seller	Security	Sale date	Amount sold	Gross proceeds
10b5-1 Sales Plan for OLIVIER POMEL	Class A Common	08/05/2026	42,443	12,168,675.49
10b5-1 Sales Plan for OLIVIER POMEL	Class A Common	08/05/2026	84,698	24,283,460.25
10b5-1 Sales Plan for OLIVIER POMEL	Class A Common	07/23/2026	47,054	11,518,400.42
10b5-1 Sales Plan for OLIVIER POMEL	Class A Common	07/13/2026	42,443	10,992,596.94
10b5-1 Sales Plan for OLIVIER POMEL	Class A Common	07/13/2026	84,698	21,936,522.51
10b5-1 Sales Plan for OLIVIER POMEL	Class A Common	06/16/2026	84,698	19,675,497.86
10b5-1 Sales Plan for OLIVIER POMEL	Class A Common	06/08/2026	42,443	9,833,690.82
10b5-1 Sales Plan for OLIVIER POMEL	Class A Common	06/08/2026	84,698	19,623,823.61
OLIVIER POMEL	Class A Common	06/02/2026	26,012	6,949,220.25
10b5-1 Sales Plan for OLIVIER POMEL	Class A Common	05/26/2026	84,698	18,936,383.58

Seller — prior-sale row 1, entry 1

Name: 10b5-1 Sales Plan for OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 2, entry 1

Name: 10b5-1 Sales Plan for OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 3, entry 1

Name: 10b5-1 Sales Plan for OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 4, entry 1

Name: 10b5-1 Sales Plan for OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 5, entry 1

Name: 10b5-1 Sales Plan for OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 6, entry 1

Name: 10b5-1 Sales Plan for OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 7, entry 1

Name: 10b5-1 Sales Plan for OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 8, entry 1

Name: 10b5-1 Sales Plan for OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 9, entry 1

Name: OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 10, entry 1

Name: 10b5-1 Sales Plan for OLIVIER POMEL
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Prior-sale reporting

Nothing to report for the preceding three months: N

Remarks

Securities to be sold, acquired through RSU/PSU or upon option exercise, were registered on Form S-8.

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