X0306 4 2020-10-20 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 2020-10-20 4 C 0 102302 0.00 A 236564 D Common A Common Stock 2020-10-20 4 S 0 31498 108.55 D 205066 D Common A Common Stock 2020-10-20 4 S 0 32883 109.3741 D 172183 D Common A Common Stock 2020-10-20 4 S 0 34646 110.2049 D 137537 D Common A Common Stock 2020-10-20 4 S 0 2975 111.2169 D 134562 D Common A Common Stock 2020-10-20 4 S 0 300 112.0367 D 134262 D Common A Common Stock 2020-10-20 4 C 0 102462 0.00 A 102462 I By GRAT Common A Common Stock 2020-10-20 4 S 0 29746 108.5161 D 72716 I By GRAT Common A Common Stock 2020-10-20 4 S 0 32454 109.3032 D 40262 I By GRAT Common A Common Stock 2020-10-20 4 S 0 35844 110.1663 D 4418 I By GRAT Common A Common Stock 2020-10-20 4 S 0 3817 111.1282 D 601 I By GRAT Common A Common Stock 2020-10-20 4 S 0 601 112.0429 D 0 I By GRAT Common A Common Stock 2020-10-20 4 C 0 101805 0.00 A 101805 I By GRAT Common A Common Stock 2020-10-20 4 S 0 29467 108.5224 D 72338 I By GRAT Common A Common Stock 2020-10-20 4 S 0 32581 109.3183 D 39757 I By GRAT Common A Common Stock 2020-10-20 4 S 0 35660 110.1787 D 4097 I By GRAT Common A Common Stock 2020-10-20 4 S 0 3797 111.1608 D 300 I By GRAT Common A Common Stock 2020-10-20 4 S 0 300 112.0333 D 0 I By GRAT Class B Common Stock 2020-10-20 4 C 0 102302 0.00 D Class A Common Stock 102302 1101224 D Class B Common Stock 2020-10-20 4 C 0 102462 0.00 D Class A Common Stock 102462 1512267 I By GRAT Class B Common Stock 2020-10-20 4 C 0 101805 0.00 D Class A Common Stock 101805 1424362 I By GRAT Class B Common Stock Class A Common Stock 363166 I By Spouse 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 December 13, 2019. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $107.87 to $108.865. 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 $108.87 to $109.86. 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 $109.87 to $110.85. 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 $110.88 to $111.75. 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 $112.03 to $112.05. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $107.80 to $108.795. 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 $108.80 to $109.79. 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 $109.80 to $110.77. 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 $110.80 to $111.79. 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 $111.80 to $112.05. 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 2018 GRAT, of which the Reporting Person is Trustee. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $107.82 to $108.81. 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 $108.82 to $109.81. 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 $109.82 to $110.80. 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 $110.82 to $111.66. 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 $112.03 to $112.04. 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. Shares are held by Reporting Person's spouse. Amit Agarwal, by /s/ Ron A. Metzger, Attorney-in-Fact 2020-10-21