X0306 4 2022-02-15 0 0001561550 Datadog, Inc. DDOG 0001466857 Richardson Julie C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 1 0 0 0 Class A Common Stock 2022-02-15 4 C 0 3906 7.9567 A 6022 D Class A Common Stock 2022-02-15 4 S 0 300 163.3233 D 5722 D Class A Common Stock 2022-02-15 4 S 0 500 164.446 D 5222 D Class A Common Stock 2022-02-15 4 S 0 1300 166.3508 D 3922 D Class A Common Stock 2022-02-15 4 S 0 1000 167.313 D 2922 D Class A Common Stock 2022-02-15 4 S 0 506 168.6642 D 2416 D Class A Common Stock 2022-02-15 4 S 0 300 169.3733 D 2116 D Stock Option (Right to Buy) 7.9567 2022-02-15 4 M 0 3906 0.00 D 2029-06-12 Class B Common Stock 3906 55470 D Class B Common Stock 2022-02-15 4 M 0 3906 0.00 A Class A Common Stock 3906 3906 D Class B Common Stock 2022-02-15 4 C 0 3906 0.00 D Class A Common Stock 3906 0 D 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 September 2, 2021. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $162.93 to $163.75. 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 $164.05 to $164.84. 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 $165.93 to $166.84. 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 $166.96 to $167.78. 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 $168.13 to $169.04. 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 $169.14 to $169.51. 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. 25% of the shares underlying the option vested on June 11, 2020, with the remainder vesting in equal monthly installments thereafter over three years. Julie Richardson, by /s/ Ron A. Metzger, Attorney-in-Fact 2022-02-17