X0609 4 2026-06-11 0 0001561550 Datadog, Inc. DDOG 0001903980 Walters Sean Michael false C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief Revenue Officer 1 Class A Common Stock 2026-06-11 4 S 0 200 225.1832 D 270096 D Class A Common Stock 2026-06-11 4 S 0 200 226.105 D 269896 D Class A Common Stock 2026-06-11 4 S 0 800 227.535 D 269096 D Class A Common Stock 2026-06-11 4 S 0 800 228.7598 D 268296 D Class A Common Stock 2026-06-11 4 S 0 2300 229.7562 D 265996 D Class A Common Stock 2026-06-11 4 S 0 2287 230.8406 D 263709 D Class A Common Stock 2026-06-11 4 S 0 1613 232.014 D 262096 D Class A Common Stock 2026-06-11 4 S 0 2197 232.9037 D 259899 D Class A Common Stock 2026-06-11 4 S 0 1479 233.9133 D 258420 D Class A Common Stock 8 I By Son Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $224.79 to $225.56. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $226.03 to $226.18. 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 $227.11 to $228.08. 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 $228.13 to $229.05. 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 $229.19 to $230.17. 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 $230.40 to $231.37. 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 $231.45 to $232.36. 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 $232.46 to $233.38. 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 $233.54 to $234.20. 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 2026-06-15