Datadog, Inc. — Director's Dealing 2026

Feb 25, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2026-02-23

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-23	Class A Common Stock	C	21612	—	Acquired	512410	Direct
2026-02-23	Class A Common Stock	S	7712	$102.0909	Disposed	504698	Direct
2026-02-23	Class A Common Stock	S	1300	$103.0998	Disposed	503398	Direct
2026-02-23	Class A Common Stock	S	2800	$104.0233	Disposed	500598	Direct
2026-02-23	Class A Common Stock	S	800	$105.235	Disposed	499798	Direct
2026-02-23	Class A Common Stock	S	3900	$106.2876	Disposed	495898	Direct
2026-02-23	Class A Common Stock	S	1100	$107.336	Disposed	494798	Direct
2026-02-23	Class A Common Stock	S	1600	$108.4381	Disposed	493198	Direct
2026-02-23	Class A Common Stock	S	1600	$109.4182	Disposed	491598	Direct
2026-02-23	Class A Common Stock	S	400	$110.425	Disposed	491198	Direct
2026-02-23	Class A Common Stock	S	400	$111.2993	Disposed	490798	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-23	Class B Common Stock	$	C	21612	Disposed		Class A Common Stock (21612)	Direct
2026-02-23	Stock Option (Right to Buy)	$10.74	M	112500	Disposed	2029-07-19	Class B Common Stock (112500)	Direct
2026-02-23	Class B Common Stock	$	M	112500	Acquired		Class A Common Stock (112500)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	169	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Class B Common Stock	$		Class A Common Stock (6203835)	6203835	Indirect

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 $101.58 to $102.56. 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 $102.58 to $103.57. 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 $103.58 to $104.52. 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.

F6: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $104.83 to $105.76. 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.

F7: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $105.87 to $106.85. 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.

F8: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $106.88 to $107.84. 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.

F9: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $107.98 to $108.97. 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.

F10: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $108.98 to $109.9. 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.

F11: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $110.05 to $110.97. 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.

F12: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $111.06 to $111.45. 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.

F13: Shares are held by the Alexis Le-Quoc Revocable Trust.

F14: Option is fully vested and exercisable.