SEC FORM 3/A

SEC FORM 3/ASEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Maraldo David R.

(Last)

(First)

(Middle)

126 EAST LINCOLN AVENUE

(Street)

RAHWAY

NEW JERSEY

07065

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
05/01/2026

3. Issuer Name and Ticker or Trading Symbol
Merck & Co., Inc. [ MRK ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)
05/04/2026

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	EVP & Pres. MMD

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	17,819.434	D
Common Stock - 401(k) Plan	8,359.14	I	By 401 (k)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Restricted Stock Unit	05/02/2024⁽¹⁾	05/02/2026	Common Stock	552	⁽²⁾	D
Restricted Stock Unit	04/30/2025⁽³⁾	04/30/2027	Common Stock	581	⁽²⁾	D
Restricted Stock Unit	04/29/2026⁽⁴⁾	04/29/2028	Common Stock	2,361	⁽²⁾	D
Stock Option (Right to Buy)	05/04/2022⁽⁵⁾	05/03/2031	Common Stock	9,465	$73.73	D
Stock Option (Right to Buy)	05/03/2023⁽⁶⁾	05/02/2032	Common Stock	9,709	$87.1	D
Stock Option (Right to Buy)	05/02/2024⁽⁷⁾	05/01/2033	Common Stock	8,990	$117.89	D
Stock Option (Right to Buy)	04/30/2025⁽⁸⁾	04/29/2034	Common Stock	8,789	$129.22	D
Stock Option (Right to Buy)	04/29/2026⁽⁹⁾	04/28/2035	Common Stock	8,060	$84.71	D

Explanation of Responses:

1. These restricted stock units vest and are distributed as shares of Merck & Co., Inc. common stock in three equal installments on 5/2/2024, 5/2/2025, and 5/2/2026.

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

3. 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.

4. 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.

5. The options became exercisable in equal installments in on 5/4/2022, 5/4/2023, and 5/4/2024.

6. The options became exercisable in equal installments on 5/3/2023, 5/3/2024, and 5/3/2025.

7. The options vest and become exercisable in equal installments on 5/2/2024, 5/2/2025, and 5/2/2026.

8. The options vest and become exercisable in equal installments on 4/30/2025, 4/30/2026, and 4/30/2027.

9. The options vest and become exercisable in equal installments on 4/29/2026, 4/29/2027, and 4/29/2028.

Remarks:

This amendment is being filed solely to: (a) update footnote 6 to correct the schedule on which the applicable options became exercisable and (b) attach a Power of Attorney that was inadvertently omitted from the original filing. Exhibit 24: Power of Attorney is attached.

	/s/ Kelly E. W. Grez as Attorney-in-Fact for David R. Maraldo	05/05/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

Amendment: New insider Maraldo David R. claimed ownership of 17,819 shares and claimed ownership of 8,359 units of Common Stock - 401 Plan (SEC Form 3)