Datadog, Inc. — Director's Dealing 2021

May 19, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2021-05-17

Reporting Person: Shah Shardul (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-17	Class A Common Stock	C	908774	$0.00	Acquired	908774	Indirect
2021-05-17	Class A Common Stock	J	908774	$0.00	Disposed	0	Indirect
2021-05-17	Class A Common Stock	J	224285	$0.00	Disposed	2908	Indirect
2021-05-17	Class A Common Stock	S	430	$79.7762	Disposed	2478	Indirect
2021-05-17	Class A Common Stock	S	1040	$80.4125	Disposed	1438	Indirect
2021-05-17	Class A Common Stock	S	1373	$81.4917	Disposed	65	Indirect
2021-05-17	Class A Common Stock	S	65	$82.2842	Disposed	0	Indirect
2021-05-17	Class A Common Stock	C	2700313	$0.00	Acquired	2700313	Indirect
2021-05-17	Class A Common Stock	J	2700313	$0.00	Disposed	0	Indirect
2021-05-17	Class A Common Stock	C	54506	$0.00	Acquired	54506	Indirect
2021-05-17	Class A Common Stock	J	54506	$0.00	Disposed	0	Indirect
2021-05-17	Class A Common Stock	J	688705	$0.00	Disposed	0	Indirect
2021-05-17	Class A Common Stock	C	48709	$0.00	Acquired	118774	Indirect
2021-05-17	Class A Common Stock	S	17573	$79.7762	Disposed	101201	Indirect
2021-05-17	Class A Common Stock	S	42490	$80.4125	Disposed	58711	Indirect
2021-05-17	Class A Common Stock	S	56066	$81.4917	Disposed	2645	Indirect
2021-05-17	Class A Common Stock	S	2645	$82.2842	Disposed	0	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-17	Class B Common Stock	$	C	908774	Disposed		Class A Common Stock (908774)	Indirect
2021-05-17	Class B Common Stock	$	C	2700313	Disposed		Class A Common Stock (2700313)	Indirect
2021-05-17	Class B Common Stock	$	C	54506	Disposed		Class A Common Stock (54506)	Indirect
2021-05-17	Class B Common Stock	$	C	48709	Disposed		Class A Common Stock (48709)	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	269382	Direct

Footnotes

F1: On May 17, 2021, Index Ventures Growth III (Jersey), L.P. ("Index Growth III") converted in the aggregate 908,774 shares of the Issuer's Class B Common Stock into 908,774 shares of the Issuer's Class A Common Stock. Subsequently on the same date, Index Growth III distributed in-kind, without consideration, 908,774 shares of Class A Common Stock pro-rata to its limited partners and its general partner, Index Venture Growth Associates III Limited ("IVGA III"), in accordance with the exemption under Rule 16a-9(a) and Rule 16a-13 of the Securities Exchange Act of 1934, as amended. On the same date, IVGA III distributed in-kind, without consideration, 224,285 shares of Class A Common Stock received in the Index Growth III distribution pro-rata to its shareholders, in accordance with the exemption under Rule 16a-9(a) and Rule 16a-13 of the Securities Exchange Act of 1934, as amended.

F2: The shares are held by Index Growth III. IVGA III is the general partner of Index Growth III. The Reporting Person is a partner within the Index Ventures group. Advisors within the Index Ventures group provide advice to each of Index Growth III, Index Ventures VI (Jersey) L.P. ("Index VI"), and Index Ventures VI Parallel Entrepreneur Fund (Jersey), L.P. ("Index VI Parallel" and together with Index Growth III and Index VI, the "Funds"). The Reporting Person disclaims Section 16 beneficial ownership of these securities, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

F3: The shares are held by IVGA III. The Reporting Person disclaims Section 16 beneficial ownership of these securities, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

F4: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.50 - $79.99. 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: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $80.00 - $80.99. 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: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $81.00 - $81.98. 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: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $82.05 - $82.50. 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 May 17, 2021, Index Ventures VI (Jersey), L.P. ("Index VI") converted in the aggregate 2,700,313 shares of the Issuer's Class B Common Stock into 2,700,313 shares of the Issuer's Class A Common Stock. Subsequently on the same date, Index VI distributed in-kind, without consideration, 2,700,313 shares of Class A Common Stock pro-rata to its partners, including its limited partners and its general partner, Index Venture Associates VI Limited ("IVA VI"), in accordance with the exemption under Rule 16a-9(a) and Rule 16a-13 of the Securities Exchange Act of 1934, as amended. On the same date, IVA VI distributed in-kind, without consideration, the 675,078 shares of Class A Common Stock received in the Index VI distribution pro-rata to its shareholders, in accordance with the exemption under Rule 16a-9(a) and Rule 16a-13 of the Securities Exchange Act of 1934, as amended.

F9: The shares are held by Index VI. IVA VI is the general partner of Index VI. The Reporting Person disclaims Section 16 beneficial ownership of these securities, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

F10: On May 17, 2021, Index Ventures VI Parallel Entrepreneur Fund (Jersey), L.P. ("Index VI Parallel") converted in the aggregate 54,506 shares of the Issuer's Class B Common Stock into 54,506 shares of the Issuer's Class A Common Stock. Subsequently on the same date, Index VI Parallel distributed in-kind, without consideration, 54,506 shares of Class A Common Stock pro-rata to its partners, including its limited partners and its general partner, IVA VI, in accordance with the exemption under Rule 16a-9(a) and Rule 16a-13 of the Securities Exchange Act of 1934, as amended. On the same date, IVA VI distributed in-kind, without consideration, the 13,627 shares of Class A Common Stock received in the Index VI Parallel distribution pro-rata to its shareholders, in accordance with the exemption under Rule 16a-9(a) and Rule 16a-13 of the Securities Exchange Act of 1934, as amended.

F11: The shares are held by Index VI Parallel. IVA VI is the general partner of Index VI Parallel. The Reporting Person disclaims Section 16 beneficial ownership of these securities, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

F12: The shares are held by IVA VI.

F13: On May 17, 2021, Yucca (Jersey) SLP ("Yucca") converted in the aggregate 48,709 shares of the Issuer's Class B Common Stock into 48,709 shares of the Issuer's Class A Common Stock.

F14: The shares are held by 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). The Reporting Person disclaims Section 16 beneficial ownership of these securities, except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.

F15: Includes shares received in the distributions described in footnotes (1), (8) and (10) above.

F16: 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.