Merck & Co., Inc. — Director's Dealing 2021

May 4, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Merck & Co., Inc. (MRK)
CIK: 0000310158
Period of Report: 2021-05-01

Reporting Person: Li Dean Y (Executive VP & President, MRL)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-01	Common Stock	M	1030	$74.50	Acquired	11714.914	Direct
2021-05-01	Common Stock	F	354	$74.50	Disposed	11360.914	Direct
2021-05-03	Common Stock	M	750	$74.50	Acquired	12110.914	Direct
2021-05-03	Common Stock	F	257	$74.50	Disposed	11853.914	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-01	Restricted Stock Unit	$	M	1030	Disposed	2023-05-01	Common Stock (1030)	Direct
2021-05-03	Restricted Stock Unit	$	M	750	Disposed	2022-05-03	Common Stock (750)	Direct

Footnotes

F1: Holdings include shares acquired in dividend reinvestment transactions.

F2: Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

F3: These restricted stock units vest and are distributed as shares of Merck & Co., Inc. common stock in three equal installments on 5/1/2021, 5/1/2022 and 5/1/2023.

F4: These restricted stock units vest and are distributed as shares of Merck & Co., Inc. common stock in three equal installments on 5/3/2020, 5/3/2021 and 5/3/2022.