X0609 4 2026-06-08 0 0001561550 Datadog, Inc. DDOG 0001120741 OBSTLER DAVID M false C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief Financial Officer 1 Class A Common Stock 2026-06-08 4 S 0 7500 229.2883 D 502091 D Class A Common Stock 2026-06-08 4 S 0 17966 230.5904 D 484125 D Class A Common Stock 2026-06-08 4 S 0 21382 231.314 D 462743 D Class A Common Stock 2026-06-08 4 S 0 12398 232.4147 D 450345 D Class A Common Stock 2026-06-08 4 S 0 10054 233.3147 D 440291 D Class A Common Stock 2026-06-08 4 S 0 2783 234.3125 D 437508 D Class A Common Stock 2026-06-08 4 S 0 2217 235.3507 D 435291 D Class A Common Stock 2026-06-08 4 S 0 100 236.20 D 435191 D Class A Common Stock 2026-06-08 4 S 0 600 239.1317 D 434591 D Shares sold pursuant to a 10b5-1 plan dated March 9, 2026. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $228.75 to $229.73. 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 $229.92 to $230.90. 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 $230.92 to $231.91. 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 $231.92 to $232.91. 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 $232.92 to $233.85. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $233.99 to $234.90. 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 $234.99 to $235.84. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $239.04 to $239.55. 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 2026-06-10