Insider plans $5.6M Merck (NYSE: MRK) stock sale under Rule 144

Rhea-AI Filing Summary

Merck & Co. has a holder filing a notice to sell 47,434 shares of its common stock under Rule 144. The planned sale, through Morgan Stanley Smith Barney LLC, has an aggregate market value of $5,598,136.96 and is expected around 02/04/2026 on the NYSE.

The shares come from restricted stock that vested under a registered plan on 01/26/2026, in the same 47,434‑share amount. The filing also notes that 2,482,022,536 shares of Merck common stock are outstanding.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	47434	5598136.96	2482022536	02/04/2026	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	01/26/2026	Restricted stock vesting under a registered plan	Issuer			47434	01/26/2026	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

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 filing for Merck (MRK) disclose?

The Form 144 discloses a planned sale of 47,434 Merck common shares under Rule 144. The shares will be sold through Morgan Stanley Smith Barney LLC on the NYSE, with an aggregate market value of approximately $5,598,136.96 and an intended sale date around February 4, 2026.

How many Merck (MRK) shares are planned to be sold and at what value?

The filing covers a proposed sale of 47,434 Merck common shares with an aggregate market value of $5,598,136.96. This amount is based on the market price used in the notice and reflects the total value of the shares listed for the planned Rule 144 transaction.

When and how were the Merck (MRK) shares in the Form 144 acquired?

The 47,434 Merck common shares were acquired on January 26, 2026, through restricted stock vesting under a registered plan. The filing notes the issuer as the source and indicates full vesting on that date, with no separate cash payment described for the acquisition.

On which exchange and through which broker will the Merck (MRK) shares be sold?

The planned sale is to occur on the NYSE using Morgan Stanley Smith Barney LLC Executive Financial Services as broker. Their listed address is 1 New York Plaza, 8th Floor, New York, NY 10004, and they will handle the 47,434‑share Rule 144 transaction.

How many Merck (MRK) shares are outstanding according to this Form 144?

The notice states that 2,482,022,536 Merck common shares are outstanding. This figure provides context for the planned 47,434‑share sale under Rule 144, indicating the scale of the transaction relative to the company’s total common stock base.

What representations does the seller make in the Merck (MRK) Form 144?

The seller represents that they do not know any material adverse information about Merck’s current or prospective operations that has not been publicly disclosed. The notice also warns that intentional misstatements or omissions constitute federal criminal violations under 18 U.S.C. 1001.