X0306 4 2022-02-11 0 0001561550 Datadog, Inc. DDOG 0001540517 Agarwal Amit C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief Product Officer Common A Common Stock 2022-02-11 4 C 0 2500 0.00 A 2500 I By Spouse Common A Common Stock 2022-02-11 4 S 0 100 165.816 D 2400 I By Spouse Common A Common Stock 2022-02-11 4 S 0 190 167.1243 D 2210 I By Spouse Common A Common Stock 2022-02-11 4 S 0 480 167.8783 D 1730 I By Spouse Common A Common Stock 2022-02-11 4 S 0 80 168.9225 D 1650 I By Spouse Common A Common Stock 2022-02-11 4 S 0 100 171.64 D 1550 I By Spouse Common A Common Stock 2022-02-11 4 S 0 50 173.09 D 1500 I By Spouse Common A Common Stock 2022-02-11 4 S 0 350 174.7407 D 1150 I By Spouse Common A Common Stock 2022-02-11 4 S 0 450 176.0811 D 700 I By Spouse Common A Common Stock 2022-02-11 4 S 0 400 177.0712 D 300 I By Spouse Common A Common Stock 2022-02-11 4 S 0 200 178.19 D 100 I By Spouse Common A Common Stock 2022-02-11 4 S 0 50 179.19 D 50 I By Spouse Common A Common Stock 2022-02-11 4 S 0 50 180.49 D 0 I By Spouse Common A Common Stock 2174 I By GRAT Common A Common Stock 161944 D Class B Common Stock 2022-02-11 4 C 0 2500 0.00 D Class A Common Stock 2500 113166 I By Spouse Class B Common Stock Class A Common Stock 607826 I By GRAT Class B Common Stock Class A Common Stock 7 D Class B Common Stock Class A Common Stock 1058365 I By Trust 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 are held by Reporting Person's spouse. Shares sold pursuant to a 10b5-1 plan entered into on September 9, 2021. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $165.30 to $166.23. 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 $166.48 to $167.46. 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 $167.51 to $168.50. 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 $168.79 to $168.99. 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 $171.62 to $171.66. 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 $174.50 to $175.06. 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 $175.54 to $176.53. 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 $176.62 to $177.47. 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 $177.73 to $178.42. 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. Shares are held directly by Amit Agarwal 2019 GRAT, of which the Reporting Person is Trustee. Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee. Amit Agarwal, by /s/ Ron A. Metzger, Attorney-in-Fact 2022-02-15