Merck (NYSE: MRK) EVP Guindo Chirfi sells 15,000 company shares

Rhea-AI Filing Summary

Merck & Co., Inc. executive Guindo Chirfi, EVP, Access, Policy & Comms, reported selling 15,000 shares of common stock on August 6, 2026 at $131.00 per share in an open‑market or private transaction. After the sale, he directly owned 46,613 shares of Merck common stock.

Insider Trade Summary

Net Seller: 15,000 shares

Net Sell 1 txn

Insider Guindo Chirfi

Role EVP, Access, Policy & Comms

Sold 15,000 shs ($1.97M)

Type	Security	Shares	Price	Value
Sale	Common Stock	15,000	$131.00	$1.97M

Holdings After Transaction: Common Stock — 46,613.127 shares (Direct)

Key Figures

Shares sold: 15,000 shares Sale price: $131.00 per share Shares owned after sale: 46,613 shares +1 more

4 metrics

Shares sold 15,000 shares Common Stock sold by EVP Guindo Chirfi on August 6, 2026

Sale price $131.00 per share Price for the 15,000 Merck common shares sold

Shares owned after sale 46,613 shares Direct Merck common stock holdings following the transaction

Net shares sold 15,000 shares Net share change from this reported transaction

Key Terms

Common Stock, open market or private transaction

2 terms

Common Stock financial

"security_title Common Stock for the reported executive sale"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

open market or private transaction regulatory

"transaction described as a sale in open market or private transaction"

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/07/2026 - 04:17 PM Accepted by SEC EDGAR 08/07/2026 - 04:17 PM Learn about SEC filing dates

FAQ

What insider transaction did Merck (MRK) report for Guindo Chirfi?

Merck (MRK) reported that EVP Guindo Chirfi sold 15,000 shares of Merck common stock. The transaction was classified as a sale in an open market or private transaction and was reported as involving directly held shares.

How many Merck (MRK) shares did Guindo Chirfi sell and at what price?

Guindo Chirfi sold 15,000 shares of Merck (MRK) common stock at a price of $131.00 per share. The sale was reported as a non-derivative transaction involving Merck’s Common Stock security class.

When did the Merck (MRK) executive share sale by Guindo Chirfi occur?

The reported sale by Merck (MRK) executive Guindo Chirfi took place on August 6, 2026. On that date he sold 15,000 shares of Merck common stock in a transaction categorized as an open market or private transaction.

How many Merck (MRK) shares does Guindo Chirfi hold after this sale?

After the reported sale, Guindo Chirfi directly owned 46,613 shares of Merck (MRK) common stock. This post-transaction figure reflects his direct ownership position following the disposition of 15,000 shares on August 6, 2026.

Was Guindo Chirfi’s Merck (MRK) share sale reported as a direct or indirect holding?

The Merck (MRK) transaction was reported under direct ownership, meaning the 15,000 shares sold and the remaining 46,613 shares are held directly in Guindo Chirfi’s name, rather than through an intermediate entity or indirect ownership structure.

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^*

Guindo Chirfi

(Last) (First) (Middle)

MERCK & CO., INC.

126 EAST LINCOLN AVENUE

(Street)

RAHWAY NEW JERSEY 07065

(City) (State) (Zip)

UNITED STATES

(Country)

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)
	EVP, Access, Policy & Comms

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/06/2026

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

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

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

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	08/06/2026		S		15,000	D	$131	46,613.127	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:

	/s/ Kelly Grez, as attorney-in-fact for Chirfi Guindo	08/07/2026
	** 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.
* Form 4: SEC 1474 (03-26)