X0508 4 2025-11-24 0 0001561550 Datadog, Inc. DDOG 0001783984 Le-Quoc Alexis C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 1 1 0 0 Chief Technology Officer 1 Class A Common Stock 2025-11-24 4 S 0 3243 156.8785 D 392418 D Class A Common Stock 2025-11-24 4 S 0 13281 157.6902 D 379137 D Class A Common Stock 2025-11-24 4 S 0 16822 158.7832 D 362315 D Class A Common Stock 2025-11-24 4 S 0 9878 159.6158 D 352437 D Class A Common Stock 169 I By Trust Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $156.22 to $157.21. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $157.30 to $158.29. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $158.30 to $159.28. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $159.30 to $160.16. 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. Shares are held by the Alexis Le-Quoc Revocable Trust. /s/ Kerry Acocella, Attorney-in-Fact 2025-11-26