Datadog, Inc. — Director's Dealing 2019

Sep 23, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2019-09-23

Reporting Person: Index Ventures VI (Jersey) LP (10% Owner)
Reporting Person: Index Ventures Growth III (Jersey), L.P. (10% Owner)
Reporting Person: Index Ventures VI Parallel Entrepreneur Fund (Jersey) LP (10% Owner)
Reporting Person: Yucca (Jersey) SLP (10% Owner)
Reporting Person: Index Venture Growth Associates III Ltd (10% Owner)
Reporting Person: Index Venture Associates VI Ltd (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-09-23	Common Stock	J	853776	$0.00	Disposed	0	Direct
2019-09-23	Common Stock	J	13002	$0.00	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-09-23	Class B Common Stock	$	J	853776	Acquired		Class A Common Stock (853776)	Direct
2019-09-23	Class B Common Stock	$	J	13002	Acquired		Class A Common Stock (13002)	Direct
2019-09-23	Series Seed Preferred Stock	$	C	2897346	Disposed		See footnote (2897346)	Direct
2019-09-23	Series B Preferred Stock	$	C	221328	Disposed		See footnote (221328)	Direct
2019-09-23	Series C Preferred Stock	$	C	835680	Disposed		See footnote (835680)	Direct
2019-09-23	Series D Preferred Stock	$	C	8288724	Disposed		See footnote (8288724)	Direct
2019-09-23	Class B Common Stock	$	J	12243078	Acquired		Class A Common Stock (13096854)	Direct
2019-09-23	Series A Preferred Stock	$	C	19356168	Disposed		See footnote (19356168)	Direct
2019-09-23	Series B Preferred Stock	$	C	7259472	Disposed		See footnote (7259472)	Direct
2019-09-23	Series C Preferred Stock	$	C	10949568	Disposed		See footnote (10949568)	Direct
2019-09-23	Series D Preferred Stock	$	C	1350528	Disposed		See footnote (1350528)	Direct
2019-09-23	Class B Common Stock	$	J	38915736	Acquired		Class A Common Stock (38915736)	Direct
2019-09-23	Series A Preferred Stock	$	C	390708	Disposed		See footnote (390708)	Direct
2019-09-23	Series B Preferred Stock	$	C	146532	Disposed		See footnote (146532)	Direct
2019-09-23	Series C Preferred Stock	$	C	221016	Disposed		See footnote (221016)	Direct
2019-09-23	Series D Preferred Stock	$	C	27264	Disposed		See footnote (27264)	Direct
2019-09-23	Class B Common Stock	$	J	785520	Acquired		Class A Common Stock (785520)	Direct
2019-09-23	Series Seed Preferred Stock	$	C	44121	Disposed		See footnote (44121)	Direct
2019-09-23	Series A Preferred Stock	$	C	249960	Disposed		See footnote (249960)	Direct
2019-09-23	Series B Preferred Stock	$	C	97104	Disposed		See footnote (97104)	Direct
2019-09-23	Series C Preferred Stock	$	C	154128	Disposed		See footnote (154128)	Direct
2019-09-23	Series D Preferred Stock	$	C	143652	Disposed		See footnote (143652)	Direct
2019-09-23	Class B Common Stock	$	J	688965	Acquired		Class A Common Stock (701967)	Direct

Footnotes

F1: Immediately prior to the closing of the Issuer's initial public offering, each share of Common Stock was reclassified into one share of Class B Common Stock in an exempt transaction pursuant to Rule 16b-7.

F2: The shares are held by Index Ventures Growth III (Jersey), L.P. ("Index Growth III"). Index Venture Growth Associates III Limited ("IVGA III") is
the managing general partner of Index Growth III and disclaims Section 16 beneficial ownership of such shares except to the extent of its
pecuniary interest therein, if any, and this report shall not be deemed an admission that such shares are beneficially owned by it for Section 16 or any other purpose.

F3: The shares are held by Yucca (Jersey) SLP ("Yucca"). Yucca is the administrator of the Index co-investment vehicles that are contractually
required to mirror the relevant Fund's investment in the issuer (in this case, Index Growth III, Index VI and Index VI Parallel). Each of IVGA III
and IVA VI disclaims Section 16 beneficial ownership of such shares except to the extent of its pecuniary interest therein, if any, and this report
shall not be deemed an admission that such shares are beneficially owned by it for Section 16 or any other purpose.

F4: 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.

F5: All shares of Preferred Stock automatically converted into Common Stock on a 1:1 basis and were reclassified into shares of Class B Common Stock on a 1:1 basis immediately prior to the closing of the Issuer's initial public offering.

F6: The shares are held by Index Ventures VI (Jersey), L.P. ("Index VI"). Index Venture Associates VI Limited ("IVA VI") is the managing general
partner of Index VI and disclaims Section 16 beneficial ownership of such shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such shares are beneficially owned by it for Section 16 or any other purpose.

F7: The shares are held by Index Ventures VI Parallel Entrepreneur Fund (Jersey), L.P. ("Index VI Parallel"). IVA VI is the managing general partner
of Index VI Parallel and disclaims Section 16 beneficial ownership of such shares except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such shares are beneficially owned by it for Section 16 or any other purpose.