144 0001120741 XXXXXXXX LIVE 0001561550 Datadog, Inc. 001-39051 620 8th Avenue, 45th Floor New York NY 10018 866-329-4466 David Obstler Officer Class A Common Stock Morgan Stanley Smith Barney LLC Executive Services 200 W Civic Center Dr - 4th Floor Sandy UT 84070 16031 3767285 330825798 06/02/2026 NASDAQ Class A Common Stock 06/01/2026 Restricted Stock Units and Performance Stock Units vesting Issuer N 16031 06/01/2026 Compensation N David Obstler 620 8th Avenue, 45th floor New York NY 10018 Class A Common Stock 03/02/2026 40057 4427736.55 Securities to be sold were registered on Form S-8 06/02/2026 /s/ David Obstler