Merck & Co., Inc.

Results of Operations and Financial Condition

Other Events

Prospectus Supplement for Primary Offering

Free Writing Prospectus

Prospectus Supplement for Primary Offering

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Other Events

Prospectus Supplement for Primary Offering

Free Writing Prospectus

Prospectus Supplement for Primary Offering

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Specialized Disclosure Report

Submission of Matters to a Vote of Security Holders

Shareholder Letter

General form for quarterly reports under Section 13 or 15(d)

Letter from the SEC

Results of Operations and Financial Condition

Shareholder Letter

Correspondence with the SEC

Annual Report Scanned (Paper)

Shareholder Letter

Letter from the SEC

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Annual report pursuant to Section 13 or 15(d)

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

General form for quarterly reports under Section 13 or 15(d)

No description available

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

5.07,8.01,9.01

No description available

Registration of Securities on Exchange

Specialized Disclosure Report

Prospectus Supplement for Primary Offering

Free Writing Prospectus

No description available

Prospectus Supplement for Primary Offering

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

No description available

Annual Report Scanned (Paper)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Shareholder Letter

Shareholder Letter

Automatic Shelf Registration

Automatic Shelf Registration

Annual report pursuant to Section 13 or 15(d)

5.02

2.02,2.05,9.01

5.02

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

Annual reports of employee stock purchase savings and similar plans pursuant to Section 15(d)

5.07

Specialized Disclosure Report

Shareholder Letter

8.01,9.01

Prospectus Supplement for Primary Offering

Free Writing Prospectus

Prospectus Supplement for Primary Offering

General form for quarterly reports under Section 13 or 15(d)

Shareholder Letter

Shareholder Letter

Shareholder Letter

Annual Report Scanned (Paper)

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Shareholder Letter

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Annual report pursuant to Section 13 or 15(d)

Prospectus Supplement for Primary Offering

Free Writing Prospectus

Prospectus Supplement for Primary Offering

General form for quarterly reports under Section 13 or 15(d)

No description available

General form for quarterly reports under Section 13 or 15(d)

Shareholder Letter

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

Guindo Chirfi

Guindo Chirfi

Li Dean Y

Li Dean Y

Guindo Chirfi

Zachary Jennifer

Zachary Jennifer

Guindo Chirfi

DeLuca Richard R.

Davis Robert M

Litchfield Caroline

Williams David Michael

Oosthuizen Johannes Jacobus

Li Dean Y

Smart Dalton E. III

Oosthuizen Johannes Jacobus

DeLuca Richard R.

Williams David Michael

Guindo Chirfi