X0306 4 2020-12-01 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 2020-11-18 5 G 0 E 11352 0.00 D 105910 D Class A Common Stock 2020-12-01 4 C 0 159733 A 159733 I By Trust Class A Common Stock 2020-12-01 4 S 0 38471 94.6872 D 121262 I By Trust Class A Common Stock 2020-12-01 4 S 0 76091 95.506 D 45171 I By Trust Class A Common Stock 2020-12-01 4 S 0 39271 96.5702 D 5900 I By Trust Class A Common Stock 2020-12-01 4 S 0 900 97.1681 D 5000 I By Trust Class A Common Stock 2020-12-01 4 S 0 5000 98.45 D 0 I By Trust Class A Common Stock 2020-12-02 4 C 0 157267 A 157267 I By Trust Class A Common Stock 2020-12-02 4 S 0 14960 90.7247 D 142307 I By Trust Class A Common Stock 2020-12-02 4 S 0 23754 91.5569 D 118553 I By Trust Class A Common Stock 2020-12-02 4 S 0 69413 92.843 D 49140 I By Trust Class A Common Stock 2020-12-02 4 S 0 49140 93.4215 D 0 I By Trust Class A Common Stock 2020-12-01 4 C 0 52400 A 52400 I By GRAT Class A Common Stock 2020-12-01 4 S 0 15841 94.6901 D 36559 I By GRAT Class A Common Stock 2020-12-01 4 S 0 29503 95.3928 D 7056 I By GRAT Class A Common Stock 2020-12-01 4 S 0 7056 96.5423 D 0 I By GRAT Class A Common Stock 2020-12-01 4 C 0 50000 A 50000 I By Trust Class A Common Stock 2020-12-01 4 S 0 16887 94.7224 D 33113 I By Trust Class A Common Stock 2020-12-01 4 S 0 26678 95.4237 D 6435 I By Trust Class A Common Stock 2020-12-01 4 S 0 6435 96.5494 D 0 I By Trust Class A Common Stock 2020-12-01 4 C 0 50000 A 50000 I By Trust Class A Common Stock 2020-12-01 4 S 0 18037 94.7442 D 31963 I By Trust Class A Common Stock 2020-12-01 4 S 0 25471 95.4381 D 6492 I By Trust Class A Common Stock 2020-12-01 4 S 0 6492 96.5576 D 0 I By Trust Class B Common Stock 2020-12-01 4 C 0 159733 0.00 D Class B Common Stock 159733 11725823 I By Trust Class B Common Stock 2020-12-02 4 C 0 157267 0.00 D Class B Common Stock 157267 11568556 I By Trust Class B Common Stock 2020-12-01 4 C 0 52400 0.00 D Class B Common Stock 52400 3050213 I By GRAT Class B Common Stock 2020-12-01 4 C 0 50000 0.00 D Class B Common Stock 50000 200000 I By Trust Class B Common Stock 2020-12-01 4 C 0 50000 0.00 D Class B Common Stock 50000 200000 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 $94.03 to $95.02. 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 $95.03 to $96.02. 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 $96.03 to $97.02. 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 $97.08 to $97.56. 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 $90.13 to $91.10. 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 $91.13 to $92.12. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $92.18 to $93.17. 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 $93.18 to $93.86. 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. 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 $94.02 to $95.01. 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 $95.02 to $95.99. 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 $96.06 to $97.04. 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 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 $94.06 to $95.05. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $95.06 to $96.05. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $96.08 to $97.02. 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 $94.09 to $95.08. 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 $95.09 to $96.04. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $96.10 to $97.02. 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 2020-12-03