X0306 4 2021-04-05 0 0001561550 Datadog, Inc. DDOG 0001783984 Le-Quoc Alexis C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 1 1 0 0 President & CTO Class A Common Stock 2021-04-05 4 C 0 237750 A 237750 I By Trust Class A Common Stock 2021-04-05 4 S 0 65046 82.3242 D 172704 I By Trust Class A Common Stock 2021-04-05 4 S 0 127588 83.1137 D 45116 I By Trust Class A Common Stock 2021-04-05 4 S 0 25875 84.0281 D 19241 I By Trust Class A Common Stock 2021-04-05 4 S 0 7335 85.4115 D 11906 I By Trust Class A Common Stock 2021-04-05 4 S 0 9106 85.9274 D 2800 I By Trust Class A Common Stock 2021-04-05 4 S 0 700 87.1686 D 2100 I By Trust Class A Common Stock 2021-04-05 4 S 0 2100 87.80 D 0 I By Trust Class A Common Stock 2021-04-05 4 C 0 39300 A 39300 I By GRAT Class A Common Stock 2021-04-05 4 S 0 11776 82.3342 D 27524 I By GRAT Class A Common Stock 2021-04-05 4 S 0 19866 83.1112 D 7658 I By GRAT Class A Common Stock 2021-04-05 4 S 0 4658 84.0248 D 3000 I By GRAT Class A Common Stock 2021-04-05 4 S 0 2100 85.5652 D 900 I By GRAT Class A Common Stock 2021-04-05 4 S 0 800 86.0925 D 100 I By GRAT Class A Common Stock 2021-04-05 4 S 0 100 87.81 D 0 I By GRAT Class A Common Stock 2021-04-05 4 C 0 37500 A 37500 I By Trust Class A Common Stock 2021-04-05 4 S 0 11736 82.349 D 25764 I By Trust Class A Common Stock 2021-04-05 4 S 0 19488 83.1504 D 6276 I By Trust Class A Common Stock 2021-04-05 4 S 0 3501 84.1056 D 2775 I By Trust Class A Common Stock 2021-04-05 4 S 0 2100 85.6239 D 675 I By Trust Class A Common Stock 2021-04-05 4 S 0 600 86.1625 D 75 I By Trust Class A Common Stock 2021-04-05 4 S 0 75 87.86 D 0 I By Trust Class A Common Stock 2021-04-05 4 C 0 37500 A 37500 I By Trust Class A Common Stock 2021-04-05 4 S 0 10723 82.3137 D 26777 I By Trust Class A Common Stock 2021-04-05 4 S 0 19562 83.1026 D 7215 I By Trust Class A Common Stock 2021-04-05 4 S 0 4415 84.0341 D 2800 I By Trust Class A Common Stock 2021-04-05 4 S 0 1000 85.3631 D 1800 I By Trust Class A Common Stock 2021-04-05 4 S 0 1700 85.9147 D 100 I By Trust Class A Common Stock 2021-04-05 4 S 0 100 86.80 D 0 I By Trust Class A Common Stock 117262 D Class B Common Stock 2021-04-05 4 C 0 237750 0.00 D Class A Common Stock 237750 10368454 I By Trust Class B Common Stock 2021-04-05 4 C 0 39300 0.00 D Class A Common Stock 39300 2853713 I By GRAT Class B Common Stock 2021-04-05 4 C 0 37500 0.00 D Class A Common Stock 37500 12500 I By Trust Class B Common Stock 2021-04-05 4 C 0 37500 0.00 D Class A Common Stock 37500 12500 I By Trust Each share of Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election, 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 nine-month anniversary of 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 the Alexis Le-Quoc Revocable Trust. Shares sold pursuant to a 10b5-1 plan entered into on September 14, 2020. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $81.72 to $82.71. 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 $82.72 to $83.71. 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 $83.72 to $84.71. 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 $84.74 to $85.73. 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 $85.74 to $86.69. 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 $86.77 to $87.70. 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 the Alexis Le-Quoc 2016 GRAT. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.73 to $83.72. 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 $83.73 to $84.68. 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 $84.83 to $85.82. 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 $85.86 to $86.80. 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. Shares are held by Offbeat Polymath Trust. Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest, if any, in the shares. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $81.79 to $82.76. 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 $82.79 to $83.78. 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 $83.83 to $84.75. 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 $84.91 to $85.85. 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 $85.91 to $86.59. 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 Endearing Viceroy Trust. Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest, if any, in the shares. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $81.70 to $82.69. 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 $82.70 to $83.69. 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 $83.71 to $84.67. 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 $84.71 to $85.68. 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 $85.72 to $86.30. 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. Alexis Le-Quoc, by /s/ Ron A. Metzger, Attorney-in-Fact 2021-04-07