SEC Form 4 · accession 0001561550-26-000236

Datadog, Inc. · DDOG

Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗

Reporting owner

Director

Period of report

Jul 1, 2026

Accepted (ET)

Jul 6, 2026 · 5:54 pm EDT

Rule 10b5-1 plan

yes — trade under a plan

Issuer CIK

0001561550

Table I — non-derivative securities

Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Class A Common Stock^F1,F2	Jul 1, 2026	C	12,500	—	A	27,496	I	By Trust
Class A Common Stock^F2	Jul 1, 2026	S	12,500	$267.47	D	14,996	I	By Trust
Class A Common Stock	holding	—	—		—	20,684	D

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Class B Common Stock^F2,F1	—	Jul 1, 2026	C	12,500	D	—	—	Class A Common Stock	12,500	98,042	I

F1Each 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.
F2The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee.
F3Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.