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MRK · Merck & Co., Inc. · Debt

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$140.56 -4.71 (-3.24%)
S&P 500 member Russell 1000 member Dow 30 member Rebalance outlook locked
Market Cap
$358.41B
Shares
2.47B
Volume · Oct 26 8.07M Avg daily vol (3M) 10.06M

Debt Profile

Reported borrowing balances, repayment dates and agreement terms, with links to the underlying filings.

Reported debt balances

Each amount keeps its reported scope. Related balance-sheet measures appear under the borrowing they describe.

Reported balanceAs ofAmountSource
Current debt and lease obligations 2026-06-30 USD 2,825,000,000 10-Q filed 2026-08-07
Noncurrent debt carrying amount 2026-06-30 USD 51,081,000,000 10-Q filed 2026-08-07
8 filing observations remain unmatched and are excluded from instrument histories.
Instrument and agreement coverage is incomplete. Additional filings are awaiting review.
2 filings have incomplete source or extraction coverage. Verified observations are shown; missing observations do not establish that debt was unchanged.

Covenants

Covenant terms have not yet been verified for this profile.

The balance figures do not establish whether covenants apply or whether the company complies with them.

Loans, facilities and notes

4.300% Notes due 2028

Note · Merck & Co., Inc.

Reference: 4.300% Notes due 2028

Active
Original principal
USD 1,000,000,000
Outstanding
—
Commitment
—
Availability
—
Maturity
—

Last reported interest terms: 4.3% Reported 2026-05-22 Later filings may not restate these terms; this does not confirm they still apply.

Covenant terms for this agreement are not yet verified.

Documents and filing history
  1. Issuance · 2026-05-22 Original principal USD 1,000,000,000 Exact source document Parent 8-K filing · 2026-05-22
    On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Issuer evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.

4.650% Notes due 2031

Note · Merck & Co., Inc.

Reference: 4.650% Notes due 2031

Active
Original principal
USD 500,000,000
Outstanding
—
Commitment
—
Availability
—
Maturity
—

Last reported interest terms: 4.65% Reported 2026-05-22 Later filings may not restate these terms; this does not confirm they still apply.

Covenant terms for this agreement are not yet verified.

Documents and filing history
  1. Issuance · 2026-05-22 Original principal USD 500,000,000 Exact source document Parent 8-K filing · 2026-05-22
    On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Issuer evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.

4.950% Notes due 2033

Note · Merck & Co., Inc.

Reference: 4.950% Notes due 2033

Active
Original principal
USD 1,000,000,000
Outstanding
—
Commitment
—
Availability
—
Maturity
—

Last reported interest terms: 4.95% Reported 2026-05-22 Later filings may not restate these terms; this does not confirm they still apply.

Covenant terms for this agreement are not yet verified.

Documents and filing history
  1. Issuance · 2026-05-22 Original principal USD 1,000,000,000 Exact source document Parent 8-K filing · 2026-05-22
    On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Issuer evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.

5.200% Notes due 2036

Note · Merck & Co., Inc.

Reference: 5.200% Notes due 2036

Active
Original principal
USD 1,500,000,000
Outstanding
—
Commitment
—
Availability
—
Maturity
—

Last reported interest terms: 5.2% Reported 2026-05-22 Later filings may not restate these terms; this does not confirm they still apply.

Covenant terms for this agreement are not yet verified.

Documents and filing history
  1. Issuance · 2026-05-22 Original principal USD 1,500,000,000 Exact source document Parent 8-K filing · 2026-05-22
    On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Issuer evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.

5.750% Notes due 2046

Note · Merck & Co., Inc.

Reference: 5.750% Notes due 2046

Active
Original principal
USD 500,000,000
Outstanding
—
Commitment
—
Availability
—
Maturity
—

Last reported interest terms: 5.75% Reported 2026-05-22 Later filings may not restate these terms; this does not confirm they still apply.

Covenant terms for this agreement are not yet verified.

Documents and filing history
  1. Issuance · 2026-05-22 Original principal USD 500,000,000 Exact source document Parent 8-K filing · 2026-05-22
    On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Issuer evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.

5.850% Notes due 2056

Note · Merck & Co., Inc.

Reference: 5.850% Notes due 2056

Active
Original principal
USD 1,000,000,000
Outstanding
—
Commitment
—
Availability
—
Maturity
—

Last reported interest terms: 5.85% Reported 2026-05-22 Later filings may not restate these terms; this does not confirm they still apply.

Covenant terms for this agreement are not yet verified.

Documents and filing history
  1. Issuance · 2026-05-22 Original principal USD 1,000,000,000 Exact source document Parent 8-K filing · 2026-05-22
    On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Issuer evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.

Floating Rate Notes due 2028

Note · Merck & Co., Inc.

Reference: Floating Rate Notes due 2028

Active
Original principal
USD 500,000,000
Outstanding
—
Commitment
—
Availability
—
Maturity
—

Covenant terms for this agreement are not yet verified.

Documents and filing history
  1. Issuance · 2026-05-22 Original principal USD 500,000,000 Exact source document Parent 8-K filing · 2026-05-22
    On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Issuer evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
    Supporting evidence: On May 22, 2026, Merck & Co., Inc. (the “Company”) closed an underwritten public offering of $500,000,000 aggregate principal amount of Floating Rate Notes due 2028 (the “Floating Rate Notes”), $1,000,000,000 aggregate principal amount of 4.300% Notes due 2028 (the “2028 Notes”), $500,000,000 aggregate principal amount of 4.650% Notes due 2031 (the “2031 Notes”), $1,000,000,000 aggregate principal amount of 4.950% Notes due 2033 (the “2033 Notes”), $1,500,000,000 aggregate principal amount of 5.200% Notes due 2036 (the “2036 Notes”), $500,000,000 aggregate principal amount of 5.750% Notes due 2046 (the “2046 Notes”) and $1,000,000,000 aggregate principal amount of 5.850% Notes due 2056 (the “2056 Notes” and, together with the Floating Rate Notes, the 2028 Notes, the 2031 Notes, the 2033 Notes, the 2036 Notes and the 2046 Notes, collectively, the “Notes”) under the Company’s Registration Statement on Form S-3ASR (Registration No. 333-278066), originally filed with the Securities and Exchange Commission (the “Commission”) on March 19, 2024, as amended by Post-Effective Amendment No. 1, filed with the Commission on May 14, 2024.
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