Merck & Co., Inc. — Director's Dealing 2025

May 5, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Merck & Co., Inc. (MRK)
CIK: 0000310158
Period of Report: 2025-05-03

Reporting Person: Smart Dalton E. III (SVP Fin. - Global Controller)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-05-03	Common Stock	M	518	$83.18	Acquired	8850.802	Direct
2025-05-03	Common Stock	F	256	$83.18	Disposed	8594.802	Direct
2025-05-03	Common Stock	M	1532	$83.18	Acquired	10126.802	Direct
2025-05-03	Common Stock	F	588	$83.18	Disposed	9538.802	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-05-03	Restricted Stock Unit	$	M	518	Disposed	2025-05-03	Common Stock (518)	Direct
2025-05-03	Restricted Stock Unit	$	M	1532	Disposed	2025-05-03	Common Stock (1532)	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 equal, annual installments with one installment having vested on 5/3/2024 and the last installment having vested on 5/3/2025.