Datadog (DDOG)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-04-01 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Datadog, Inc. (DDOG) CIK: 0001561550 --- Reporting Owner --- Name: Walters Sean Michael CIK: 0001903980 Role: Officer (Chief Revenue Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-04-01 | Code: A (Grant or award) Shares: +54,797 | Price: $0.00 Shares Owned After: 293,181 | Ownership: D (Direct) Footnotes: [F1] Represents the number of shares of Class A Common Stock underlying restricted stock units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A Common Stock. The shares underlying the RSUs vest as to 12/48 of the shares on March 1, 2027 and the remainder of the shares vest in 12 equal installments on each June 1, September 1, December 1 and March 1 thereafter, subject to the Reporting Person remaining in Continuous Service (as defined in the Issuer's 2019 Equity Incentive Plan) of the Issuer as of each such date. --- Holdings --- [Holding #1] Security: Class A Common Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: Represents the number of shares of Class A Common Stock underlying restricted stock units ("RSUs"). Each RSU represents the contingent right to receive one share of the Issuer's Class A Common Stock. The shares underlying the RSUs vest as to 12/48 of the shares on March 1, 2027 and the remainder of the shares vest in 12 equal installments on each June 1, September 1, December 1 and March 1 thereafter, subject to the Reporting Person remaining in Continuous Service (as defined in the Issuer's 2019 Equity Incentive Plan) of the Issuer as of each such date. --- Signature --- /s/ /s/ Kerry Acocella, Attorney-in-Fact (2026-04-03)