Datadog, Inc. — Director's Dealing 2020

Feb 26, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2020-02-24

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
2020-02-24	Class A Common Stock	S	700	$42.70	Disposed	137808	Direct
2020-02-24	Class A Common Stock	S	3500	$43.97	Disposed	134308	Direct
2020-02-24	Class A Common Stock	S	63765	$44.98	Disposed	70543	Direct
2020-02-24	Class A Common Stock	S	800	$45.31	Disposed	69743	Direct
2020-02-25	Class A Common Stock	S	23401	$43.64	Disposed	46342	Direct
2020-02-25	Class A Common Stock	S	42142	$44.46	Disposed	4200	Direct
2020-02-25	Class A Common Stock	S	4200	$45.30	Disposed	0	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	1	Direct

Footnotes

F1: On February 24, 2020, Yucca (Jersey) SLP ("Yucca") sold 700 shares of the Issuer's Class A Common Stock. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.50 - $43.00. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F2: The shares are held by Yucca. Yucca is the administrator of the Index co-investment vehicles that are contractually required to mirror the relevant Index fund's investment in the Issuer (in this case, Index Ventures Growth III (Jersey), L.P. ("Index Growth III", Index Ventures VI (Jersey), L.P. ("Index VI") and Index Ventures VI Parallel Entrepreneur Fund (Jersey), L.P. ("Index VI Parallel")). Index Venture Growth Associates III Limited ("IVGA III") is the general partner of Index Growth III and Index Venture Associates VI Limited ("IVA VI") is the general partner of Index VI. 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.

F3: On February 24, 2020, Yucca sold 3,500 shares of the Issuer's Class A Common Stock. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $43.18 - $44.15. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F4: On February 24, 2020, Yucca sold 63,765 shares of the Issuer's Class A Common Stock. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.29 - $45.27. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F5: On February 24, 2020, Yucca sold 800 shares of the Issuer's Class A Common Stock. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.29 - $45.33. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F6: On February 25, 2020, Yucca sold 23,401 shares of the Issuer's Class A Common Stock. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $43.06 - $44.05. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F7: On February 25, 2020, Yucca sold 42,412 shares of the Issuer's Class A Common Stock. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.06 - $45.01. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F8: On February 25, 2020, Yucca sold 4,200 shares of the Issuer's Class A Common Stock. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.07 - $45.52. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F9: This share is held by Index VI. IVA VI disclaims Section 16 beneficial ownership of such share except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that such share is beneficially owned by it for Section 16 or any other purpose.