MRK insider plans potential sale of 12,837 shares

An affiliate of an MRK insider filed to potentially sell 12,837 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with an approximate sale date of 08/11/2026 and total shares outstanding of 2,467,171,638.

Accepted by SEC EDGAR 08/11/2026 - 04:14 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

An affiliate of an MRK insider filed to potentially sell 12,837 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with an approximate sale date of 08/11/2026 and total shares outstanding of 2,467,171,638. The filer previously acquired shares through restricted stock vesting and reported past 3‑month sales of 20,784 and 6,050 shares of common stock.

Key Figures

Shares to be sold: 12,837 shares Shares outstanding: 2,467,171,638 shares Recent sale 1: 20,784 shares for 2,710,950.65 +3 more

6 metrics

Shares to be sold 12,837 shares Proposed common stock sale with approximate date 08/11/2026

Shares outstanding 2,467,171,638 shares Issuer common shares outstanding as referenced in the Form 144

Recent sale 1 20,784 shares for 2,710,950.65 Common stock sold on 08/10/2026

Recent sale 2 6,050 shares for 788,772.63 Common stock sold on 08/06/2026

RS vesting 1 5,442 shares Restricted stock vesting under a registered plan on 02/09/2018

RS vesting 2 7,395 shares Restricted stock vesting under a registered plan on 02/27/2017

Key Terms

Form 144, Restricted Stock Vesting Under a Registered Plan, aggregate market value, approximate date of sale

4 terms

Form 144 regulatory

"144: Securities Sold During The Past 3 Months"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock Vesting Under a Registered Plan financial

"Common | 02/09/2018 | Restricted Stock Vesting Under a Registered Plan"

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC ... | 12837 | 1691426.23"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

approximate date of sale regulatory

"2467171638 | 08/11/2026 | NYSE"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does MRK's Form 144 filing disclose about planned stock sales?

The filing discloses a plan to potentially sell 12,837 shares of MRK common stock around 08/11/2026, using Morgan Stanley Smith Barney LLC Executive Financial Services as broker, with issuer shares outstanding of 2,467,171,638.

How many MRK shares has the insider sold in the past three months?

The insider reported selling 20,784 MRK common shares on 08/10/2026 and 6,050 shares on 08/06/2026, for aggregate sale amounts of 2,710,950.65 and 788,772.63, respectively.

What type of MRK securities are covered in this Form 144?

The Form 144 covers common stock of the issuer, including shares acquired via Restricted Stock Vesting Under a Registered Plan and shares proposed to be sold through a broker.

How were the MRK shares acquired before the Form 144 sale plan?

The insider acquired MRK common stock through restricted stock vesting under a registered plan, including 5,442 shares on 02/09/2018 and 7,395 shares on 02/27/2017, as disclosed in the filing.

Who is the reporting person in MRK's Form 144 and what is disclosed?

The reporting person is Richard Robert DeLuca Jr, who disclosed prior sales totaling 26,834 shares over two transactions and a planned potential sale of 12,837 shares of MRK common stock.

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

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001421339
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MERCK & CO., INC.
SEC File Number	001-06571
Address of Issuer	126 East Lincoln Avenue Rahway NEW JERSEY 07065
Phone	(732) 594-4000
Name of Person for Whose Account the Securities are To Be Sold	RICHARD ROBERT DELUCA JR
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	12837	1691426.23	2467171638	08/11/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	02/09/2018	Restricted Stock Vesting Under a Registered Plan	Issuer			5442	02/09/2018	Not Applicable
Common	02/27/2017	Restricted Stock Vesting Under a Registered Plan	Issuer			7395	02/27/2017	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
RICHARD ROBERT DELUCA JR 126 East Lincoln Avenue Rahway NJ 07065	Common	08/10/2026	20784	2710950.65
RICHARD ROBERT DELUCA JR 126 East Lincoln Avenue Rahway NJ 07065	Common	08/06/2026	6050	788772.63

144: Remarks and Signature

Remarks
Date of Notice	08/11/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Robert R. DeLuca
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)