Notice of Proposed Sale · 144

Datadog, Inc.

DDOGNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Jul 20, 2026Accepted Jul 20, 2026, 4:19 PM EDTFiling CIK 1561550Accession 0001950047-26-007229

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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: ALEXIS T LEQUOC
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	43,224	11,181,616.56	330,825,798	07/20/2026	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	12/06/2023	Previously Exercised Stock Options	Issuer	43,224	N	12/06/2023	Cash

Sales reported in the preceding three months

Sales reported in the preceding three months · 11 reported rows
Seller	Security	Sale date	Amount sold	Gross proceeds
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	07/08/2026	43,224	11,118,989.31
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	07/08/2026	10,688	2,749,392.88
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	06/22/2026	43,224	9,551,315.34
ALEXIS T LEQUOC	Class A Common	06/02/2026	21,506	5,745,422.53
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	06/01/2026	43,224	11,715,649.08
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	06/01/2026	10,688	2,896,928.96
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	05/18/2026	43,224	8,992,459.28
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	05/05/2026	10,806	1,620,900.00
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	05/04/2026	32,418	4,698,507.15
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	05/04/2026	10,688	1,549,025.73
10b5-1 Sales for ALEXIS T LEQUOC	Class A Common	04/22/2026	43,224	5,655,315.78

Seller — prior-sale row 1, entry 1

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

Seller — prior-sale row 4, entry 1

Name: ALEXIS T LEQUOC
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 for ALEXIS T LEQUOC
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 for ALEXIS T LEQUOC
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 for ALEXIS T LEQUOC
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 for ALEXIS T LEQUOC
Street: 620 8th Avenue, 45th Floor
City: New York
State / country code: NY
Postal code: 10018

Seller — prior-sale row 9, entry 1

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

Seller — prior-sale row 11, entry 1

Name: 10b5-1 Sales for ALEXIS T LEQUOC
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

The securities to be sold were acquired upon the previous exercise of stock options during the period of 12/06/2023 through 10/14/2024. Securities to be sold, acquired through RSU/PSU or upon option exercise, were registered on Form S-8.

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