X0609 4 2026-08-19 0 0001561550 Datadog, Inc. DDOG 0001783990 Pomel Olivier false C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 1 1 0 0 Chief Executive Officer 1 Class A Common Stock 2026-08-19 4 C 0 47054 0 A 659801 D Class A Common Stock 2026-08-19 4 S 0 3443 232.9754 D 656358 D Class A Common Stock 2026-08-19 4 S 0 19219 233.6794 D 637139 D Class A Common Stock 2026-08-19 4 S 0 5792 234.8418 D 631347 D Class A Common Stock 2026-08-19 4 S 0 9400 235.7841 D 621947 D Class A Common Stock 2026-08-19 4 S 0 2400 236.7766 D 619547 D Class A Common Stock 2026-08-19 4 S 0 1097 237.5157 D 618450 D Class A Common Stock 2026-08-19 4 S 0 909 238.9479 D 617541 D Class A Common Stock 2026-08-19 4 S 0 1094 239.8216 D 616447 D Class A Common Stock 2026-08-19 4 S 0 200 241.1334 D 616247 D Class A Common Stock 2026-08-19 4 S 0 1344 242.7986 D 614903 D Class A Common Stock 2026-08-19 4 S 0 1256 243.7313 D 613647 D Class A Common Stock 2026-08-19 4 S 0 200 245.15 D 613447 D Class A Common Stock 2026-08-19 4 S 0 700 246.66 D 612747 D Class B Common Stock 2026-08-19 4 C 0 47054 0 D Class A Common Stock 47054 8746189 D Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon the earliest of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's amended and restated certificate of incorporation, (ii) the death of the Reporting Person in the case of shares held directly or in a trustee capacity, and (iii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock. Shares sold pursuant to a 10b5-1 plan dated December 15, 2025. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $232.36 to $233.35. 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 $233.36 to $234.34. 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 $234.36 to $235.34. 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 $235.36 to $236.35. 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 $236.37 to $237.36. 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 $237.38 to $238.13. 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 $238.38 to $239.37. 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 $239.43 to $240.22. 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 $240.80 to $241.63. 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 $242.25 to $243.03. 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 $243.25 to $244.09. 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 $244.70 to $245.60. 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 2026-08-21