X0609 4 2026-09-11 0 0001561550 Datadog, Inc. DDOG 0001783061 Li Yanbing false C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief Product Officer 1 Class A Common Stock 2026-09-11 4 S 0 400 219.045 D 262746 D Class A Common Stock 2026-09-11 4 S 0 3700 220.5687 D 259046 D Class A Common Stock 2026-09-11 4 S 0 7300 221.4209 D 251746 D Class A Common Stock 2026-09-11 4 S 0 700 222.1771 D 251046 D Class A Common Stock 2026-09-11 4 S 0 300 223.03 D 250746 D Class A Common Stock 2026-09-11 4 S 0 300 224.8767 D 250446 D Shares sold pursuant to a 10b5-1 plan dated June 12, 2026. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $218.70 to $219.38. 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 $219.88 to $220.87. 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 $220.88 to $221.75. 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 $221.90 to $222.45. 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 $224.83 to $224.91. 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. /s/ Kerry Acocella, Attorney-in-Fact 2026-09-15