Datadog, Inc. — Director's Dealing 2021

Dec 7, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2021-12-02

Reporting Person: Callahan Michael James (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-12-02	Class A Common Stock	C	1750	$0.00	Acquired	9825	Direct
2021-12-06	Class A Common Stock	C	12496	$0.00	Acquired	12496	Indirect
2021-12-06	Class A Common Stock	G	250	$0.00	Disposed	12226	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-12-02	Stock Option (Right to Buy)	$0.9092	M	1750	Disposed	2029-06-28	Class B Common Stock (1750)	Direct
2021-12-02	Class B Common Stock	$	M	1750	Acquired		Class A Common Stock (1750)	Direct
2021-12-02	Class B Common Stock	$	C	1750	Disposed		Class A Common Stock (1750)	Direct
2021-12-03	Class B Common Stock	$	G	87504	Disposed		Class A Common Stock (87504)	Indirect
2021-12-03	Class B Common Stock	$	G	87504	Disposed		Class A Common Stock (87504)	Indirect
2021-12-03	Class B Common Stock	$	G	18940	Acquired		Class A Common Stock (18940)	Indirect
2021-12-06	Class B Common Stock	$	C	12496	Disposed		Class A Common Stock (12496)	Indirect

Footnotes

F1: 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 earliest 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, (ii) the death of the Reporting Person in the case of shares held directly or in a trustee capacity, and (iii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock.

F2: The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee.

F3: Fully vested an exercisable.

F4: Shares are held directly by The Melanie Thernstrom Grantor Retained Annuity Trust, of which Reporting Person's spouse is Trustee.

F5: Shares are held by The Michael Callahan Grantor Retained Annuity Trust, of which Reporting Person is Trustee.

F6: Is comprised of 9,470 shares received from each of The Melanie Thernstrom Grantor Retained Annuity Trust and The Michael Callahan Grantor Retained Annuity Trust in distributions to The Callahan-Thernstrom Family Trust.