Datadog, Inc. — Director's Dealing 2026

Jan 1, 2026

SEC Form 4/A — Form 4/A

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2025-12-08

Reporting Person: Le-Quoc Alexis (Director, Chief Technology Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-08	Class A Common Stock	C	16698	—	Acquired	355370	Direct
2025-12-08	Class A Common Stock	S	15507	$153.235	Disposed	339863	Direct
2025-12-08	Class A Common Stock	S	30994	$154.2302	Disposed	308869	Direct
2025-12-08	Class A Common Stock	S	7411	$155.0094	Disposed	301458	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-12-08	Class B Common Stock	$	C	16698	Disposed		Class A Common Stock (16698)	Direct

Footnotes

F1: Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon the earliest of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's amended and restated certificate of incorporation, (ii) the death of the Reporting Person in the case of shares held directly or in a trustee capacity, and (iii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock.

F2: Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

F3: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $152.70 to $153.67. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the
Issuer, full information regarding the number of shares sold at each separate price.

F4: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $153.72 to $154.70. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the
Issuer, full information regarding the number of shares sold at each separate price.

F5: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $154.73 to $155.59. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the
Issuer, full information regarding the number of shares sold at each separate price.