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

May 2, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Merck & Co., Inc. (MRK)
CIK: 0000310158
Period of Report: 2025-04-30

Reporting Person: Larson Betty D (EVP, Chief HR Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-04-30	Common Stock	M	11350	$84.71	Acquired	11350	Direct
2025-04-30	Common Stock	F	5153	$84.71	Disposed	6197	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-04-30	Restricted Stock Unit	$	M	11350	Disposed	2027-04-30	Common Stock (11350)	Direct

Footnotes

F1: Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

F2: These restricted stock units vest and are distributed as shares of Merck & Co., Inc. common stock in three equal installments on 4/30/2025, 4/30/2026 and 4/30/2027.