Richard R. DeLuca - 29 Apr 2025 Form 4 Insider Report for Merck & Co., Inc. (MRK)

Role: EVP&Pres, Merck Animal Heallth
Signature: /s/ Kelly E. W. Grez as Attorney-in-Fact for Richard R. DeLuca, Jr.
Issuer symbol: MRK
Transactions as of: 29 Apr 2025
Net transactions value: $0
Form type: 4
Filing time: 01 May 2025, 18:10:15 UTC
Previous filing: 29 Jan 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	MRK	Common Stock						180,730	29 Apr 2025	Direct	F1
holding	MRK	Common Stock - 401(k) Plan						1,281	29 Apr 2025	By 401(k)	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MRK	Restricted Stock Unit	Award	$0	+7,555		$0.000000	7,555	29 Apr 2025	Common Stock	7,555		Direct	F3, F4
transaction	MRK	Stock Option (Right to Buy)	Award	$0	+34,390		$0.000000	34,390	29 Apr 2025	Common Stock	34,390	$84.71	Direct	F5

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

Explanation of Responses:

Id	Content
F1	Holdings include shares acquired in dividend reinvestment transactions.
F2	Includes shares acquired and dividends earned through April 7, 2025 in the Merck U.S. Savings Plan, a 401(k) plan.
F3	Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.
F4	These restricted stock units vest and are distributed as shares of Merck & Co., Inc. common stock in three equal installments on 4/29/2026, 4/29/2027 and 4/29/2028.
F5	The option vests and becomes exercisable in three equal installments on 4/29/2026, 4/29/2027 and 4/29/2028.