X0508 4 2025-12-02 0 0001561550 Datadog, Inc. DDOG 0001757760 Galloreese David C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief People Officer 0 Class A Common Stock 2025-12-02 4 S 0 2554 158.5985 D 77426 D 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 and performance-based restricted stock units, as well as any related brokerage commission fees. Includes 69 shares acquired on November 14, 2025 under the Issuers Employee Stock Purchase Plan. /s/ Kerry Acocella, Attorney-in-Fact 2025-12-04