MRK

SEC source: 0001127602-25-004103 · form4.xml · derivative · entry 3

Oosthuizen Johannes Jacobus · CIK 0001916310 · President, U.S. Market

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,002 shares

Expires 2025-02-08

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

F2 · derivative.exercise_date: These restricted stock units vested and were distributed as shares of Merck & Co., Inc. common stock in one installment on 2/8/2025. The Reporting Person's Form 3 filed on 3/10/2022 incorrectly reported that these restricted units vested and were to be distributed in three equal installments on 2/8/2023, 2/8/2024, and 2/8/2025.

SEC source: 0001127602-25-004103 · form4.xml · nonDerivative · entry 2

Oosthuizen Johannes Jacobus · CIK 0001916310 · President, U.S. Market

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,205.474

SEC source: 0001127602-25-004103 · form4.xml · nonDerivative · entry 1

Oosthuizen Johannes Jacobus · CIK 0001916310 · President, U.S. Market

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,609.474

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001127602-25-003552 · form4.xml · nonDerivative · entry 1

Downing Cristal N · CIK 0001879216 · Chief Comm. & Public Afrs Ofcr

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,085

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.7533 to $88.7610, inclusive. The reporting person undertakes to provide to Merck & Co., Inc., any security holder of Merck & Co., Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above in this footnote.

SEC source: 0001127602-25-003559 · form4.xml · nonDerivative · entry 1

THULIN INGE G · CIK 0001263739 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,932.861

SEC source: 0001127602-25-003547 · form4.xml · nonDerivative · entry 1

BAKER DOUGLAS M JR · CIK 0001198753 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,000

SEC source: 0001127602-25-002334 · form4.xml · nonDerivative · entry 1

Guindo Chirfi · CIK 0001722753 · Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 69,143.918

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 8/3/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

F2 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-25-002336 · form4.xml · nonDerivative · entry 1

Chattopadhyay Sanat · CIK 0001670690 · Exe V-P & Pres. MMD

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,758

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

SEC source: 0001127602-25-002338 · form4.xml · nonDerivative · entry 1

Davis Robert M · CIK 0001363076 · Director · Chairman, CEO & President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 443,601.757

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

SEC source: 0001127602-25-002341 · form4.xml · nonDerivative · entry 1

DeLuca Richard R. · CIK 0001421339 · EVP&Pres, Merck Animal Heallth

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 178,992.711

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

F2 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-25-002344 · form4.xml · nonDerivative · entry 1

Downing Cristal N · CIK 0001879216 · Chief Comm. & Public Afrs Ofcr

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,446

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

SEC source: 0001127602-25-002346 · form4.xml · nonDerivative · entry 1

Li Dean Y · CIK 0001837016 · Executive VP & President, MRL

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,592.15

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

F2 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-25-002349 · form4.xml · nonDerivative · entry 1

Litchfield Caroline · CIK 0001854928 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,340.194

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

SEC source: 0001127602-25-002351 · form4.xml · nonDerivative · entry 1

Oosthuizen Johannes Jacobus · CIK 0001916310 · President, U.S. Market

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,607.474

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

F2 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-25-002353 · form4.xml · nonDerivative · entry 1

Smart Dalton · CIK 0002003375 · SVP Fin. - Global Controller

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,014.286

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

SEC source: 0001127602-25-002355 · form4.xml · nonDerivative · entry 1

Williams David Michael · CIK 0001820958 · EVP,Chief Info&Digital Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,123.316

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

F2 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-25-002357 · form4.xml · nonDerivative · entry 1

Zachary Jennifer · CIK 0001737231 · EVP, General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,285.685

F1 · shares: Distribution of net after tax shares of common stock on satisfaction of performance criteria for performance share units granted on 3/31/22. Performance shares were paid out at 169 percent of target awards. Includes dividends accrued over the three-year performance period ending December 31, 2024.

F2 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-25-000246 · form4.xml · derivative · entry 2

Karsanbhai Surendralal Lanca · CIK 0001754881 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 552.8749

Underlying: Common Stock · 552.8749 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F3 · price: The price reported is the closing price of Merck Common Stock on the business day immediately prior to the effective date of the Director's service.

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

SEC source: 0001127602-25-000267 · form4.xml · derivative · entry 2

Coe Mary Ellen · CIK 0001691304 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,041.0793

Underlying: Common Stock · 301.5682 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-25-000271 · form4.xml · derivative · entry 2

GLOCER THOMAS H · CIK 0001140799 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,246.6689

Underlying: Common Stock · 490.0483 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-25-000275 · form4.xml · derivative · entry 2

Seidman Christine E · CIK 0001805745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,164.7394

Underlying: Common Stock · 81.6747 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-024639 · form4.xml · derivative · entry 2

Coe Mary Ellen · CIK 0001691304 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,574.2221

Underlying: Common Stock · 264.1775 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-024641 · form4.xml · derivative · entry 2

GLOCER THOMAS H · CIK 0001140799 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,074.9536

Underlying: Common Stock · 429.2885 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-024643 · form4.xml · derivative · entry 2

Seidman Christine E · CIK 0001805745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,977.3687

Underlying: Common Stock · 71.5481 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-021690 · form4.xml · derivative · entry 4

Guindo Chirfi · CIK 0001722753 · Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,903

Underlying: Common Stock · 36,901 shares

Expires 2025-08-03

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

F4 · derivative.exercise_date: These restricted stock units vest and are distributed as shares of Merck & Co., Inc. common stock in three equal installments on 8/3/2023, 8/3/2024 and 8/3/2025 or, if such date is not a business day, the business day immediately thereafter.

SEC source: 0001127602-24-021690 · form4.xml · nonDerivative · entry 2

Guindo Chirfi · CIK 0001722753 · Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,369.593

SEC source: 0001127602-24-021690 · form4.xml · nonDerivative · entry 1

Guindo Chirfi · CIK 0001722753 · Chief Marketing Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 57,781.593

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-019745 · form4.xml · derivative · entry 2

Coe Mary Ellen · CIK 0001691304 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,169.6876

Underlying: Common Stock · 242.3263 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-019747 · form4.xml · derivative · entry 2

GLOCER THOMAS H · CIK 0001140799 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 96,063.1361

Underlying: Common Stock · 393.7803 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-019749 · form4.xml · derivative · entry 2

Seidman Christine E · CIK 0001805745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,815.5246

Underlying: Common Stock · 65.63 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017571 · form4.xml · derivative · entry 2

LAVIZZO-MOUREY RISA J · CIK 0001034465 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,120.4279

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017574 · form4.xml · derivative · entry 2

Mayo Stephen · CIK 0001849061 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,379.7044

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017576 · form4.xml · derivative · entry 2

GLOCER THOMAS H · CIK 0001140799 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,669.3558

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017578 · form4.xml · derivative · entry 2

Craig Pamela J. · CIK 0001232910 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,233.5989

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017580 · form4.xml · derivative · entry 2

Coe Mary Ellen · CIK 0001691304 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,927.3613

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017585 · form4.xml · derivative · entry 2

BAKER DOUGLAS M JR · CIK 0001198753 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,281.5136

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017586 · form4.xml · derivative · entry 2

THULIN INGE G · CIK 0001263739 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,228.9219

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017592 · form4.xml · derivative · entry 2

Rothman Paul · CIK 0001601332 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,233.6119

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017595 · form4.xml · derivative · entry 2

Warden Kathy J · CIK 0001559112 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,252.4969

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017597 · form4.xml · derivative · entry 2

Seidman Christine E · CIK 0001805745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,749.8946

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-017600 · form4.xml · derivative · entry 2

RUSSO PATRICIA F · CIK 0001023219 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,951.7959

Underlying: Common Stock · 1,752.4295 shares

Expires not disclosed

F1 · derivative.exercise_price: 1-for-1

F2 · derivative.exercise_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F2 · derivative.expiration_date: Phantom stock units are to be settled 100% in cash upon reporting person's termination of service in accordance with a distribution schedule elected pursuant to the terms of the Plan for Deferred Payment of Directors' Compensation.

F3 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-014263 · form4.xml · derivative · entry 3

Oosthuizen Johannes Jacobus · CIK 0001916310 · President, U.S. Market

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 912 shares

Expires 2024-05-04

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

F3 · derivative.exercise_date: These restricted stock units vested and were distributed as shares of Merck & Co., Inc. common stock in three equal installments on 5/4/2022, 5/4/2023 and 5/4/2024.

SEC source: 0001127602-24-014263 · form4.xml · nonDerivative · entry 2

Oosthuizen Johannes Jacobus · CIK 0001916310 · President, U.S. Market

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,820.949

F1 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-014263 · form4.xml · nonDerivative · entry 1

Oosthuizen Johannes Jacobus · CIK 0001916310 · President, U.S. Market

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,270.949

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001127602-24-014265 · form4.xml · derivative · entry 7

Klobuchar Michael A · CIK 0001871957 · EVP - Chief Strategy Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 887 shares

Expires 2024-05-04

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

F4 · derivative.exercise_date: These restricted stock units vested and were distributed as shares of Merck & Co., Inc. common stock in three equal installments on 5/4/2022, 5/4/2023 and 5/4/2024.

SEC source: 0001127602-24-014265 · form4.xml · nonDerivative · entry 2

Klobuchar Michael A · CIK 0001871957 · EVP - Chief Strategy Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,621.195

F1 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-014265 · form4.xml · nonDerivative · entry 1

Klobuchar Michael A · CIK 0001871957 · EVP - Chief Strategy Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,058.195

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001127602-24-014269 · form4.xml · derivative · entry 4

DeLuca Richard R. · CIK 0001421339 · EVP&Pres, Merck Animal Heallth

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 27,126 shares

Expires 2024-05-04

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.

F4 · derivative.exercise_date: These restricted stock units vested and were distributed as shares of Merck & Co., Inc. common stock in one installment on 5/4/2024.

SEC source: 0001127602-24-014269 · form4.xml · nonDerivative · entry 2

DeLuca Richard R. · CIK 0001421339 · EVP&Pres, Merck Animal Heallth

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,359.559

F1 · balance_after: Holdings include shares acquired in dividend reinvestment transactions.

SEC source: 0001127602-24-014269 · form4.xml · nonDerivative · entry 1

DeLuca Richard R. · CIK 0001421339 · EVP&Pres, Merck Animal Heallth

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 163,719.559

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.