X0609 4 2026-09-14 0 0001561550 Datadog, Inc. DDOG 0001903975 Acocella Kerry false C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 General Counsel and Secretary 1 Class A Common Stock 2026-09-14 4 S 0 200 221.6285 D 120323 D Class A Common Stock 2026-09-14 4 S 0 300 222.8033 D 120023 D Class A Common Stock 2026-09-14 4 S 0 400 224.3175 D 119623 D Class A Common Stock 2026-09-14 4 S 0 409 225.3354 D 119214 D Class A Common Stock 2026-09-14 4 S 0 191 226.3243 D 119023 D Class A Common Stock 2026-09-14 4 S 0 600 228.8934 D 118423 D Class A Common Stock 2026-09-14 4 S 0 1156 229.8443 D 117267 D Class A Common Stock 2026-09-14 4 S 0 1024 230.8722 D 116243 D Class A Common Stock 2026-09-14 4 S 0 900 232.5087 D 115343 D Class A Common Stock 2026-09-14 4 S 0 100 233.37 D 115243 D Shares sold pursuant to a 10b5-1 plan dated December 11, 2025. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $221.27 to $221.98. 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 $222.38 to $223.22. 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 $223.92 to $224.45. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $225.02 to $225.96. 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 $226.21 to $226.45. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $228.31 to $229.3. 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 $229.5 to $230.12. 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 $230.55 to $231.42. 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 $232.07 to $233.06. 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 2026-09-16