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: DeLuca Richard R. (EVP&Pres, Merck Animal Heallth)

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

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	115027.642	Direct
Common Stock - 401(k) Plan	1138.8267	Indirect

Footnotes

F1: Holdings include shares acquired in dividend reinvestment transactions.

F2: Includes shares acquired and dividends earned through April 7, 2021 in the Merck U.S. Savings Plan, a 401(k) plan.

F3: The option vests and becomes exercisable in three equal installments on 5/4/2022, 5/4/2023 and 5/4/2024.