X0508 4 2023-09-13 0 0001561550 Datadog, Inc. DDOG 0001120741 OBSTLER DAVID M C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief Financial Officer 1 Class A Common Stock 2023-09-13 4 C 0 10000 1.55 A 270617 D Class A Common Stock 2023-09-13 4 S 0 7070 97.8966 D 263547 D Class A Common Stock 2023-09-13 4 S 0 2930 98.7899 D 260617 D Stock Option (Right to Buy) 1.55 2023-09-13 4 M 0 10000 0.00 D 2028-09-06 Class B Common Stock 10000 367500 D Class B Common Stock 2023-09-13 4 M 0 10000 0.00 A Class A Common Stock 10000 25603 D Class B Common Stock 2023-09-13 4 C 0 10000 0.00 D Class A Common Stock 10000 15603 D Class B Common Stock Class A Common Stock 192397 192397 I By GRAT Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon the earliest of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's amended and restated certificate of incorporation, (ii) the death of the Reporting Person in the case of shares held directly or in a trustee capacity, and (iii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock. Shares sold pursuant to a 10b5-1 plan entered into on March 13, 2023. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $97.44 to $98.43. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $98.49 to $99.20. 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. Option is fully vested and exercisable. Shares are held directly by the David Obstler 2019 GRAT, of which Reporting Person is Trustee. David Obstler, by /s/ Ron A. Metzger, Attorney-in-Fact 2023-09-15