---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-315047"
form_type: "8-K"
ticker: "ALNY"
cik: "0001178670"
company_name: "ALNYLAM PHARMACEUTICALS, INC."
filed_at: "2025-12-11T23:59:59+00:00"
generated_at: "2026-05-16T13:28:07.819844+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Alnylam repurchases $34.4M of 1.00% convertible notes due 2027 for ~$51.9M

## Summary
- Repurchased $34.4M aggregate principal of 1.00% convertible senior notes due 2027 for total cash cost of approximately $51.9M, including accrued interest.
- Remaining outstanding principal after repurchases is $362.8M.
- Repurchase price is subject to adjustment based on daily VWAP over a measurement period starting December 11, 2025.
- Existing capped call transactions entered upon note issuance remain in effect.

## SEC filing metadata
- accession: 0001193125-25-315047
- form_type: 8-K
- ticker: ALNY
- cik: 0001178670
- company_name: ALNYLAM PHARMACEUTICALS, INC.
- filed_at: 2025-12-11T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1178670/000119312525315047/0001193125-25-315047-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1178670/000119312525315047/d201569d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-315047
- JSON: https://secwatch.observer/filing/0001193125-25-315047.json
- Plain text: https://secwatch.observer/filing/0001193125-25-315047.txt

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