Merck & Co., Inc. Insider Trading Activity

Merck & Co., Inc. executive Johannes Jacobus Oosthuizen, President, U.S. Market, reported an automatic acquisition of 5,026 shares of common stock on January 26, 2026 at a reference price of $107.40 per share.

Accepted by SEC EDGAR 01/28/2026 - 04:12 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Merck & Co., Inc. executive Johannes Jacobus Oosthuizen, President, U.S. Market, reported an automatic acquisition of 5,026 shares of common stock on January 26, 2026 at a reference price of $107.40 per share. These shares were distributed as net, after-tax stock following satisfaction of performance criteria for performance share units granted on March 31, 2023, which paid out at 94% of target and included dividends accrued over the three-year performance period ending December 31, 2025.

Following this award, Oosthuizen beneficially owns 36,197.389 shares of Merck common stock in direct ownership, and holdings also reflect shares acquired through dividend reinvestment transactions.

Insider Trade Summary

Grant/Award: 5,026 shares

Grant/Award 1 txn

Insider Oosthuizen Johannes Jacobus

Role President, U.S. Market

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	5,026	$107.40	$540K

Holdings After Transaction: Common Stock — 36,197.389 shares (Direct)

Holdings Before and After: Common Stock, 31,171.389 to 36,197.389 shares (Direct)

Footnotes (2)

1. 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.
2. F2. Holdings include shares acquired in dividend reinvestment transactions.

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SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Oosthuizen Johannes Jacobus

(Last) (First) (Middle)

MERCK & CO., INC.

126 EAST LINCOLN AVENUE

(Street)

RAHWAY NJ 07065

(City) (State) (Zip)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President, U.S. Market

3. Date of Earliest Transaction (Month/Day/Year)
01/26/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	01/26/2026		A		5,026(1)	A	$107.4	36,197.389(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

2. Holdings include shares acquired in dividend reinvestment transactions.

	/s/ Kelly E. W. Grez, as attorney-in-fact for Johannes Oosthuizen	01/28/2026
	** 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.