Sanat Chattopadhyay - 29 Apr 2026 Form 4 Insider Report for Merck & Co., Inc. (MRK)

Reporting relationship: Exe V-P & Pres. MMD
Issuer ticker: MRK
Reported as of: 29 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 01 May 2026, 18:32:27 UTC
Prior SEC filing: 01 Apr 2026
Next SEC filing: 01 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Kelly E. W. Grez as Attorney-in-Fact for Sanat Chattopadhyay

Key filing fact

Sanat Chattopadhyay filed Form 4 for Merck & Co., Inc. (MRK) on 01 May 2026.

Key facts

This page summarizes Sanat Chattopadhyay's Form 4 filing for Merck & Co., Inc. (MRK).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 01 May 2026, 18:32.

Change

Previous filing in this sequence was filed on 01 Apr 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001670690 Primary reporting owner

Chattopadhyay Sanat

Relationship: Exe V-P & Pres. MMD
Address: MERCK & CO., INC., 126 EAST LINCOLN AVENUE, RAHWAY
Signature: /s/ Kelly E. W. Grez as Attorney-in-Fact for Sanat Chattopadhyay
Signature date: 01 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MRK transaction

Common Stock

Options Exercise

Transaction value
Shares: +2,597
Change %: +19%
Price: $110.03^*
Shares after: 16,477
Date: 29 Apr 2026
Ownership: Direct

MRK transaction

Common Stock

Tax liability

Transaction value
Shares: -1,130
Change %: -6.9%
Price: $110.03^*
Shares after: 15,347
Date: 29 Apr 2026
Ownership: Direct

MRK holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 74,289
Date: 29 Apr 2026
Ownership: By GRAT April 2025
Footnotes: F1

MRK holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 57,622
Date: 29 Apr 2026
Ownership: By GRAT August 2025
Footnotes: F2

MRK holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 53,417
Date: 29 Apr 2026
Ownership: By GRAT February 2025
Footnotes: F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MRK transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value
Shares: -2,597
Change %: -33%
Price: $0.000000^*
Shares after: 5,194
Date: 29 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,597
Exercise price
Footnotes: F4, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

Sanat Chattopadhyay is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 5 footnotes

Footnote F1

The reporting person serves as the sole trustee of, and maintains complete investment control over, the Sanat Chattopadhyay April 2025 Grantor Retained Annuity Trust.

Footnote F2

The reporting person serves as the sole trustee of, and maintains complete investment control over, the Sanat Chattopadhyay August 2025 Grantor Retained Annuity Trust.

Footnote F3

The reporting person serves as the sole trustee of, and maintains complete investment control over, the Sanat Chattopadhyay February 2025 Grantor Retained Annuity Trust.

Footnote F4

Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

Footnote F5

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.