Merck & Co., Inc. — Director's Dealing 2017

May 9, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Merck & Co., Inc. (MRK)
CIK: 0000310158
Period of Report: 2017-05-05

Reporting Person: DeLuca Richard R. (EVP&Pres, Merck Animal Health)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-05	Stock Option (right to buy)	$63.9700	A	64194.0000	Acquired	2027-05-04	Common Stock (64194.0000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	36358.0340	Direct
Common Stock - 401(k) Plan	1013.4190	Indirect

Footnotes

F1: Holdings include shares acquired in dividend reinvestment transactions.

F2: Includes shares acquired and dividends earned through April 7, 2017, in the Merck U.S. Savings Plan, a 401(k) plan.

F3: The option vests and becomes exercisable in three equal installments on 5/5/2018, 5/5/2019 and 5/5/2020.