X0508 4 2023-12-04 0 0001561550 Datadog, Inc. DDOG 0001783990 Pomel Olivier 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 2023-12-04 4 C 0 85637 0.3067 A 403421 D Class A Common Stock 2023-12-04 4 S 0 8715 115.9143 D 394706 D Class A Common Stock 2023-12-04 4 S 0 28085 116.7775 D 366621 D Class A Common Stock 2023-12-04 4 S 0 47697 117.9486 D 318924 D Class A Common Stock 2023-12-04 4 S 0 1140 118.3449 D 317784 D Class A Common Stock 2023-12-04 4 S 0 18652 116.774 D 299132 D Class A Common Stock 2023-12-04 4 S 0 57 117.9311 D 299075 D Stock Option (Right to Buy) 0.3067 2023-12-04 4 M 0 150240 0.00 D 2029-06-28 Class B Common Stock 150240 2704320 D Class B Common Stock 2023-12-04 4 M 0 150240 0.00 A Class A Common Stock 150240 9021255 D Class B Common Stock 2023-12-04 4 C 0 85637 0.00 D Class A Common Stock 85637 8935618 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 12, 2022. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $115.32 to $116.31. 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 $116.32 to $117.31. 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 $117.32 to $118.31. 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 $118.32 to $118.37. 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. The Reporting Person was required by the Issuer to sell only the number of shares of common stock necessary to cover applicable tax withholding obligations realized upon the vesting of restricted stock units, as well as any related brokerage commission fees. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $117.9048 to $117.9643. 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. Olivier Pomel, by /s/ Ron A. Metzger, Attorney-in-Fact 2023-12-06