X0508 4 2023-12-04 0 0001561550 Datadog, Inc. DDOG 0001540517 Agarwal Amit C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 President 0 Common A Common Stock 2023-12-04 4 S 0 11003 116.774 D 247105 D Common A Common Stock 2023-12-04 4 S 0 34 117.9666 D 247071 D Common A Common Stock 1640 I By Trust Common A Common Stock 6541 I By Trust 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 $117.935 to $117.99. 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. Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee. Shares are held directly by Agarwal 2019 Family Trust, of which the Reporting Person's spouse is Trustee. Amit Agarwal, by /s/ Ron A. Metzger, Attorney-in-Fact 2023-12-06