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

May 6, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Merck & Co., Inc. (MRK)
CIK: 0000310158
Period of Report: 2021-05-04

Reporting Person: Zachary Jennifer (EVP, General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-04	Common Stock	M	5772	$75.98	Acquired	36983.931	Direct
2021-05-04	Common Stock	F	2843	$75.98	Disposed	34140.931	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-04	Stock Option (Right to Buy)	$75.99	A	82653	Acquired	2031-05-03	Common Stock (82653)	Direct
2021-05-04	Restricted Stock Unit	$	M	5772	Disposed	2021-05-04	Common Stock (5772)	Direct

Footnotes

F1: Holdings include shares acquired in dividend reinvestment transactions.

F2: The option vests and becomes exercisable in three equal installments on 5/4/2022, 5/4/2023 and 5/4/2024.

F3: Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

F4: These restricted stock units vested and were distributed as shares of Merck & Co., Inc. common stock in three equal installments on 5/4/2019, 5/4/2020 and 5/4/2021.