X0306 4 2022-03-03 0 0001561550 Datadog, Inc. DDOG 0001783518 Jacobson Matthew C/O ICONIQ CAPITAL 394 PACIFIC AVENUE, 2ND FLOOR SAN FRANCISCO CA 94111 1 0 0 0 Class A Common Stock 2022-03-03 4 S 0 12497 155.4471 D 261335 I By ICONIQ Strategic Partners IV, L.P. Class A Common Stock 2022-03-03 4 S 0 20411 155.4471 D 428247 I By ICONIQ Strategic Partners IV-B, L.P. Class A Common Stock 2022-03-03 4 S 0 17938 156.4148 D 243397 I By ICONIQ Strategic Partners IV, L.P. Class A Common Stock 2022-03-03 4 S 0 29097 156.4148 D 399150 I By ICONIQ Strategic Partners IV-B, L.P. Class A Common Stock 2022-03-03 4 S 0 12187 157.3317 D 231210 I By ICONIQ Strategic Partners IV, L.P. Class A Common Stock 2022-03-03 4 S 0 20424 157.3317 D 378726 I By ICONIQ Strategic Partners IV-B, L.P. Class A Common Stock 2022-03-03 4 S 0 3344 158.3556 D 227866 I By ICONIQ Strategic Partners IV, L.P. Class A Common Stock 2022-03-03 4 S 0 5741 158.3556 D 372985 I By ICONIQ Strategic Partners IV-B, L.P. Class A Common Stock 2022-03-03 4 S 0 9343 159.5355 D 218523 I By ICONIQ Strategic Partners IV, L.P. Class A Common Stock 2022-03-03 4 S 0 15739 159.5355 D 357246 I By ICONIQ Strategic Partners IV-B, L.P. Class A Common Stock 2022-03-03 4 S 0 5398 160.2311 D 213125 I By ICONIQ Strategic Partners IV, L.P. Class A Common Stock 2022-03-03 4 S 0 9173 160.2311 D 348073 I By ICONIQ Strategic Partners IV-B, L.P. Class A Common Stock 336763 I By ICONIQ Strategic Partners II, L.P. Class A Common Stock 263616 I By ICONIQ Strategic Partners II-B, L.P. Class A Common Stock 122430 I By ICONIQ Strategic Partners II Co-Invest, L.P., DD Series Class A Common Stock 349566 I By ICONIQ Strategic Partners III, L.P. Class A Common Stock 373513 I By ICONIQ Strategic Partners III-B, L.P. Class A Common Stock 246752 D The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $155.00 to $155.94. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request. The shares are held by ICONIQ Strategic Partners IV, L.P. ("ICONIQ IV") The shares are held by ICONIQ Strategic Partners IV-B, L.P. ("ICONIQ IV-B") The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $156.10 to $156.99. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $157.00 to $157.98. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $158.00 to $158.95. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $159.03 to $159.99. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $160.00 to $160.74. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request. The shares are held by ICONIQ Strategic Partners II, L.P. ("ICONIQ II"). The shares are held by ICONIQ Strategic Partners II-B, L.P. ("ICONIQ II-B"). The shares are held by ICONIQ Strategic Partners II Co-Invest, L.P., DD Series ("ICONIQ II Co-Invest"). The shares are held by ICONIQ Strategic Partners III, LP ("ICONIQ III"). The shares are held by ICONIQ Strategic Partners III-B, LP ("ICONIQ III-B"). ICONIQ Strategic Partners II GP, L.P. ("ICONIQ II GP") is the sole general partner of each of ICONIQ II, ICONIQ II-B and ICONIQ II Co-Invest. ICONIQ Strategic Partners II TT GP, Ltd. ("ICONIQ II Parent GP") is the sole general partner of ICONIQ II GP. ICONIQ Strategic Partners III GP, L.P. ("ICONIQ III GP") is the sole general partner of each of ICONIQ III and ICONIQ III-B. ICONIQ Strategic Partners III TT GP, Ltd. ("ICONIQ III Parent GP") is the sole general partner of ICONIQ III GP. ICONIQ Strategic Partners IV GP, L.P. ("ICONIQ IV GP") is the sole general partner of ICONIQ IV and ICONIQ IV-B. ICONIQ Strategic Partners IV TT GP, Ltd. ("ICONIQ IV Parent GP") is the general partner of ICONIQ IV GP. Divesh Makan ("Makan") and William J.G. Griffith ("Griffith") are the sole equity holders of ICONIQ II Parent GP and ICONIQ III Parent GP and Makan, Griffith and Matthew Jacobson are the sole equity holders of ICONIQ IV Parent GP. The Reporting Person is a General Partner and a Managing Director at ICONIQ Capital. The Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose. Includes shares received in prior distributions-in-kind made in accordance with the exemptions afforded by Rule 16a-13 and Rule 16a-9 of the Exchange Act. These shares are directly held by the Reporting Person through a trust of which he is a trustee and another estate planning trust having an independent trustee. /s/ Matthew Jacobson 2022-03-07