X0609 4 2026-07-13 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 2026-07-13 4 C 0 127141 0 A 739888 D Class A Common Stock 2026-07-13 4 S 0 800 251.0044 D 739088 D Class A Common Stock 2026-07-13 4 S 0 2780 252.7295 D 736308 D Class A Common Stock 2026-07-13 4 S 0 7447 253.6295 D 728861 D Class A Common Stock 2026-07-13 4 S 0 7995 254.691 D 720866 D Class A Common Stock 2026-07-13 4 S 0 9109 255.6064 D 711757 D Class A Common Stock 2026-07-13 4 S 0 6674 256.6935 D 705083 D Class A Common Stock 2026-07-13 4 S 0 4820 257.5586 D 700263 D Class A Common Stock 2026-07-13 4 S 0 8984 258.8104 D 691279 D Class A Common Stock 2026-07-13 4 S 0 11275 259.6722 D 680004 D Class A Common Stock 2026-07-13 4 S 0 41654 260.4085 D 638350 D Class A Common Stock 2026-07-13 4 S 0 11348 261.5817 D 627002 D Class A Common Stock 2026-07-13 4 S 0 9400 262.7832 D 617602 D Class A Common Stock 2026-07-13 4 S 0 4855 263.4747 D 612747 D Stock Option (Right to Buy) 0.9092 2026-07-13 4 M 0 38118 0 D 2027-10-24 Class B Common Stock 38118 266826 D Class B Common Stock 2026-07-13 4 M 0 38118 0.9092 A Class A Common Stock 38118 8985031 D Stock Option (Right to Buy) 10.74 2026-07-13 4 M 0 35715 0 D 2029-07-18 Class B Common Stock 35715 702593 D Class B Common Stock 2026-07-13 4 M 0 35715 10.74 A Class A Common Stock 35715 9020746 D Class B Common Stock 2026-07-13 4 C 0 127141 0 D Class A Common Stock 127141 8893605 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 $250.29 to $251.14. 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 $252.16 to $253.15. 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 $253.17 to $254.16. 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 $254.18 to $255.17. 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 $255.18 to $256.15. 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 $256.18 to $257.1750. 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 $257.18 to $258.17. 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 $258.18 to $259.17. 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 $259.18 to $260.17. 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 $260.20 to $261.19. 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 $261.20 to $262.19. 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 $262.20 to $263.19. 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 $263.20 to $264.09. 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. Option is fully vested and exercisable. /s/ Kerry Acocella, Attorney-in-Fact 2026-07-15