X0609 4 2026-09-03 0 0001561550 Datadog, Inc. DDOG 0001861590 Blitzer Adam false C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief Operating Officer 1 Class A Common Stock 2026-09-03 4 S 0 300 211.6833 D 249659 D Class A Common Stock 2026-09-03 4 S 0 700 212.7557 D 248959 D Class A Common Stock 2026-09-03 4 S 0 5002 213.9434 D 243957 D Class A Common Stock 2026-09-03 4 S 0 4730 214.7283 D 239227 D Class A Common Stock 2026-09-03 4 S 0 993 215.6074 D 238234 D Class A Common Stock 2026-09-03 4 S 0 107 217.175 D 238127 D Class A Common Stock 2026-09-03 4 S 0 100 217.80 D 238027 D Class A Common Stock 2026-09-03 4 S 0 100 220.15 D 237927 D Shares sold pursuant to a 10b5-1 plan dated August 22, 2025. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $211.21 to $211.96. 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 $212.25 to $213.17. 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 $213.29 to $214.28. 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 $214.29 to $215.19. 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 $215.34 to $216.08. 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 $216.39 to $217.23. 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. /s/ Kerry Acocella, Attorney-in-Fact 2026-09-08