---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-22-246487"
form_type: "8-K"
ticker: "ALNY"
cik: "0001178670"
company_name: "ALNYLAM PHARMACEUTICALS, INC."
filed_at: "2022-09-16T23:59:59+00:00"
generated_at: "2026-06-23T09:01:44.909924+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Alnylam closes $1.035B convertible note offering; repays $762M credit facility

## Summary
- Issued $1.035B aggregate principal of 1.00% Convertible Senior Notes due 2027 (initial $900M plus $135M additional).
- Conversion rate initially 3.4941 shares per $1,000 principal; conversion price ~$286.20/share, a 35% premium over $212 closing.
- Entered capped call transactions with cap price $424/share; cost ~$118.6M to reduce dilution upon conversion.
- Used ~$762M of proceeds to repay and terminate April 2020 credit agreement.
- Notes mature Sept 15, 2027; interest payable semiannually at 1.00%.

## SEC filing metadata
- accession: 0001193125-22-246487
- form_type: 8-K
- ticker: ALNY
- cik: 0001178670
- company_name: ALNYLAM PHARMACEUTICALS, INC.
- filed_at: 2022-09-16T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 1.02, 2.03, 3.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1178670/000119312522246487/0001193125-22-246487-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1178670/000119312522246487/d386201d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-22-246487
- JSON: https://secwatch.observer/filing/0001193125-22-246487.json
- Plain text: https://secwatch.observer/filing/0001193125-22-246487.txt

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