X0306 4 2019-12-10 0 0001561550 Datadog, Inc. DDOG 0001371755 CONTOUR VENTURE PARTNERS LP 475 PARK AVENUE SOUTH, 6TH FLOOR NEW YORK NY 10016 0 0 1 0 0001634046 Contour Opportunity Fund, L.P. 475 PARK AVENUE SOUTH, 6TH FLOOR NEW YORK NY 10016 0 0 1 0 Class A Common Stock 2019-12-10 4 J 0 1128406 0.00 A 1128406 D Class A Common Stock 2019-12-10 4 J 0 1128406 0.00 D 0 D Class B Common Stock 2019-12-10 4 J 0 1128406 0.00 D Class A Common Stock 1128406 4513628 D Following the early lock-up expiration on December 6, 2019, twenty percent of the Reporting Persons' Class B Common Stock, which was previously subject to a one hundred eighty day lock-up restriction, was automatically released from such restriction and converted to Class A Common Stock (the "Converted Shares"), with 787,155 of the Converted Shares owned by Contour Venture Partners, L.P. and 341,251 of the Converted Shares owned by Contour Opportunity Fund, L.P. The Reporting Persons distributed the Converted Shares in a pro rata distribution to their limited partners. Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock 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 earlier 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, and (ii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock. The shares are owned directly by Contour Venture Partners, L.P. and Contour Opportunity Fund, L.P., with 3,148,623 shares owned by Contour Venture Partners, L.P. and 1,365,005 shares owned by Contour Opportunity Fund, L.P. following the distribution of the Converted Shares. Contour Venture Partners, L.P. by /s/ Matt Gorin, Managing Partner 2019-12-11 Contour Opportunity Fund, L.P., by /s/ Matt Gorin, Managing Partner 2019-12-11