Merck & Co., Inc. — Director's Dealing 2026

Jan 28, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Merck & Co., Inc. (MRK)
CIK: 0000310158
Period of Report: 2026-01-26

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-01-26	Common Stock	A	12264	$107.40	Acquired	197858.834	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock - 401(k) Plan	1312.5134	Indirect

Footnotes

F1: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/23. Performance shares were paid out at 94 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2025.

F2: Holdings include shares acquired in dividend reinvestment transactions.

F3: Includes shares acquired and dividends earned through January 8, 2026 in the Merck U.S. Savings Plan, a 401(k) plan.