Jennifer Zachary - 26 Jan 2026 Form 4 Insider Report for Merck & Co., Inc. (MRK)

Role: EVP, General Counsel
Signature: /s/ Kelly E. W. Grez as Attorney-in-Fact for Jennifer Zachary
Issuer symbol: MRK
Transactions as of: 26 Jan 2026
Net transactions value: +$1,244,014
Form type: 4
Filing time: 28 Jan 2026, 16:19:55 UTC
Previous filing: 03 Jun 2025
Next filing: 09 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Zachary Jennifer	EVP, General Counsel	MERCK & CO., INC., 126 EAST LINCOLN AVENUE, RAHWAY	/s/ Kelly E. W. Grez as Attorney-in-Fact for Jennifer Zachary	28 Jan 2026	0001737231

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MRK	Common Stock	Award	$1,244,014	+11,583	+20%	$107.40	68,916	26 Jan 2026	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
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.