X0508 4 2023-12-04 0 0001561550 Datadog, Inc. DDOG 0001903980 Walters Sean Michael C/O DATADOG, INC. 620 EIGHTH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief Revenue Officer 0 Common A Common Stock 2023-12-04 4 S 0 6503 116.774 D 169719 D Common A Common Stock 2023-12-04 4 S 0 20 117.9059 D 169699 D Common A Common Stock 8 I By son 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. Includes 160 shares acquired on November 15, 2023 under the Issuer's Employee Stock Purchase Plan. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $117.8772 to $117.92. 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. Sean Michael Walters, by /s/ Ron A. Metzger, Attorney-in-Fact 2023-12-06