Datadog, Inc. — Director's Dealing 2025

Oct 8, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2025-10-06

Reporting Person: Callahan Michael James (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-10-06	Class A Common Stock	C	91667	—	Acquired	104163	Indirect
2025-10-06	Class A Common Stock	S	91667	$157.6024	Disposed	12496	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-10-06	Class B Common Stock	$	C	91667	Disposed		Class A Common Stock (91667)	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	19612	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: The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee

F3: Shares sold pursuant to a 10b5-1 plan dated December 12, 2024.

F4: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $157.4700 to $158.4300. 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.