X0306 4 2020-03-06 1 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 2020-03-06 4 J 0 4240627 A 4240627 D Class A Common Stock 2020-03-06 4 J 0 4240627 D 0 D Class B Common Stock 2020-03-09 4 J 0 4240627 0.00 D Class A Common Stock 4240627 273001 D Following the lock-up expiration on March 6, 2020, the Reporting Persons' Class B Common Stock, which was previously subject to a lock-up restriction, was released from such restriction and converted to Class A Common Stock (the "Converted Shares"), with 3,148,623 of the Converted Shares owned by Contour Venture Partners, L.P. and 1,365,005 of the Converted Shares owned by Contour Opportunity Fund, L.P. Contour Venture Partners, L.P. distributed 3,148,623 of the Converted Shares in a pro rata distribution to its limited partners and Contour Opportunity Fund, L.P. distributed 1,092,004 of the Converted Shares in a pro rata distribution to its 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. 273,001 shares are 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 2020-03-10 Contour Opportunity Fund, L.P., by /s/ Matt Gorin, Managing Partner 2020-03-10