X0306 4 2020-01-21 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 2020-01-21 4 C 0 112900 A 112900 I By Trust Class A Common Stock 2020-01-21 4 S 0 104405 40.9249 D 8495 I By Trust Class A Common Stock 2020-01-21 4 S 0 8495 41.7693 D 0 I By Trust Class A Common Stock 2020-01-21 4 C 0 29200 A 29200 I By GRAT Class A Common Stock 2020-01-21 4 S 0 27000 40.9238 D 2200 I By GRAT Class A Common Stock 2020-01-21 4 S 0 2200 41.7537 D 0 I By GRAT Class A Common Stock 2020-01-21 4 C 0 25000 A 25000 I By Trust Class A Common Stock 2020-01-21 4 S 0 23202 40.9263 D 1798 I By Trust Class A Common Stock 2020-01-21 4 S 0 1798 41.7723 D 0 I By Trust Class A Common Stock 2020-01-21 4 C 0 25000 A 25000 I By Trust Class A Common Stock 2020-01-21 4 S 0 23131 40.926 D 1869 I By Trust Class A Common Stock 2020-01-21 4 S 0 1869 41.7665 D 0 I By Trust Class B Common Stock 2020-01-21 4 C 0 112900 0.00 D Class B Common Stock 112900 13445495 I By Trust Class B Common Stock 2020-01-21 4 C 0 29200 0.00 D Class B Common Stock 29200 3476369 I By GRAT Class B Common Stock 2020-01-21 4 C 0 25000 0.00 D Class B Common Stock 25000 575000 I By Trust Class B Common Stock 2020-01-21 4 C 0 25000 0.00 D Class B Common Stock 25000 575000 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 sold pursuant to a 10b5-1 plan. Shares are held by the Alexis Le-Quoc Revocable Trust. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $40.47 to $41.46. 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 $41.47 to $42.22. 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 $40.47 to $41.46. 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 $41.47 to $42.06. 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. Shares are held by the Agathe Le-Quoc 2018 Trust, of which Reporting Person is Trustee. 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 $40.50 to $41.49. 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 $41.51 to $42.05. 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 by the Artemis Le-Quoc 2018 Trust, of which Reporting Person is Trustee. 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 $40.50 to $41.48. 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 $41.50 to $42.03. 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. This Form 4 does not include shares previously reported as held indirectly through the Pomel Descendants' 2018 Trust, for which Reporting Person is Trustee, as it has been determined that the Reporting Person does not have any pecuniary interest in such shares. Alexis Le-Quoc, by /s/ Ron A. Metzger, Attorney-in-Fact 2020-01-23