Datadog, Inc. — Director's Dealing 2025

Dec 16, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

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

Reporting Person: Callahan Michael James (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-12	Class A Common Stock	C	15000	—	Acquired	27496	Indirect
2025-12-12	Class A Common Stock	G	15000	—	Disposed	12496	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-12-12	Class B Common Stock	$	C	15000	Disposed		Class A Common Stock (15000)	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 donated to a donor-advised fund, which will use the gifted shares for charitable purposes.