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 NJ 07065
(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
05/01/2026 		3. Issuer Name and Ticker or Trading Symbol
Merck & Co., Inc. [ MRK ]
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
 5. If Amendment, Date of Original Filed (Month/Day/Year)
05/04/2026
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)
Date Exercisable Expiration Date Title Amount or Number of Shares
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 4 (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.
ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

POWER OF ATTORNEY (PUBLIC): EXHIBIT 24 - POWER OF ATTORNEY