---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-26-037738"
form_type: "8-K"
ticker: "MRK"
cik: "0000310158"
company_name: "Merck & Co., Inc."
filed_at: "2026-05-22T20:21:18+00:00"
generated_at: "2026-05-22T20:23:06.483318+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Merck closes $6B multi-tranche debt offering with maturities from 2028 to 2056

## Summary
- Issued $6B aggregate principal across seven tranches: floating rate notes due 2028 and fixed-rate notes at 4.300%-5.850% due 2028-2056.
- Tranches include $1.5B 5.200% notes due 2036 and $1B 5.850% notes due 2056.
- Offering closed May 22, 2026 via underwritten public offering under existing shelf registration.
- Use of proceeds not disclosed; debt issuance adds to long-term balance sheet leverage.

## SEC filing metadata
- accession: 0001628280-26-037738
- form_type: 8-K
- ticker: MRK
- cik: 0000310158
- company_name: Merck & Co., Inc.
- filed_at: 2026-05-22T20:21:18+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.55
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/310158/000162828026037738/0001628280-26-037738-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/310158/000162828026037738/mrk-20260522.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-26-037738
- JSON: https://secwatch.observer/filing/0001628280-26-037738.json
- Plain text: https://secwatch.observer/filing/0001628280-26-037738.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.