X0306 4 2020-09-01 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 2020-09-01 4 C 0 170389 A 170389 I By Trust Class A Common Stock 2020-09-01 4 S 0 2328 83.4771 D 168061 I By Trust Class A Common Stock 2020-09-01 4 S 0 22819 84.7169 D 145242 I By Trust Class A Common Stock 2020-09-01 4 S 0 118417 85.402 D 26825 I By Trust Class A Common Stock 2020-09-01 4 S 0 25707 86.1865 D 1118 I By Trust Class A Common Stock 2020-09-01 4 S 0 1118 87.1194 D 0 I By Trust Class A Common Stock 2020-09-01 4 C 0 43956 A 43956 I By GRAT Class A Common Stock 2020-09-01 4 S 0 600 83.1767 D 43356 I By GRAT Class A Common Stock 2020-09-01 4 S 0 5502 84.6953 D 37854 I By GRAT Class A Common Stock 2020-09-01 4 S 0 30705 85.3931 D 7149 I By GRAT Class A Common Stock 2020-09-01 4 S 0 6749 86.1706 D 400 I By GRAT Class A Common Stock 2020-09-01 4 S 0 400 87.0675 D 0 I By GRAT Class A Common Stock 2020-09-01 4 C 0 37500 A 37500 I By Trust Class A Common Stock 2020-09-01 4 S 0 500 83.262 D 37000 I By Trust Class A Common Stock 2020-09-01 4 S 0 5231 84.7336 D 31769 I By Trust Class A Common Stock 2020-09-01 4 S 0 26085 85.4152 D 5684 I By Trust Class A Common Stock 2020-09-01 4 S 0 5484 86.1827 D 200 I By Trust Class A Common Stock 2020-09-01 4 S 0 200 87.055 D 0 I By Trust Class A Common Stock 2020-09-01 4 C 0 37500 A 37500 I By Trust Class A Common Stock 2020-09-01 4 S 0 500 83.242 D 37000 I By Trust Class A Common Stock 2020-09-01 4 S 0 2602 84.5802 D 34398 I By Trust Class A Common Stock 2020-09-01 4 S 0 26996 85.3258 D 7402 I By Trust Class A Common Stock 2020-09-01 4 S 0 7084 86.0978 D 318 I By Trust Class A Common Stock 2020-09-01 4 S 0 318 87.0647 D 0 I By Trust Class A Common Stock 117262 D Class B Common Stock 2020-09-01 4 C 0 170389 0.00 D Class B Common Stock 170389 12202556 I By Trust Class B Common Stock 2020-09-01 4 C 0 43956 0.00 D Class B Common Stock 43956 3155013 I By GRAT Class B Common Stock 2020-09-01 4 C 0 37500 0.00 D Class B Common Stock 37500 300000 I By Trust Class B Common Stock 2020-09-01 4 C 0 37500 0.00 D Class B Common Stock 37500 300000 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 December 6, 2019. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.85 to $83.75. 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 $83.92 to $84.91. 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 $84.92 to $85.91. 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 $85.92 to $86.91. 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 $86.98 to $87.35. 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 $82.78 to $83.70. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $83.91 to $84.90. 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 $85.90. 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 $86.80. 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 $86.92 to $87.29. 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. Shares sold pursuant to a 10b5-1 plan entered into on December 7, 2019. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.83 to $83.75. 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 $83.94 to $84.93. 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 $84.94 to $85.93. 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 $85.94 to $86.90. 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 $86.99 to $87.12. 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 $82.81 to $83.70. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $83.81 to $84.80. 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 $84.81 to $85.79. 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 $85.83 to $86.60. 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 $86.91 to $87.29. 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 2020-09-03