---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-23-056978"
form_type: "8-K"
ticker: "ALKS"
cik: "0001520262"
company_name: "Alkermes plc."
filed_at: "2023-10-31T23:59:59+00:00"
generated_at: "2026-06-09T04:36:20.136619+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Alkermes sets Nov 6 record date, Nov 15 distribution for Mural Oncology spin-off (1:10 ratio)

## Summary
- Form 10 declared effective by SEC for Mural Oncology spin-off.
- Record date set as Nov 6, 2023; distribution date Nov 15, 2023.
- Shareholders receive one Mural share per ten Alkermes shares held.
- When-issued trading for MURA under 'MURAV' and ALKS ex-distribution under 'ALKSV' expected.
- Mural Oncology to trade on Nasdaq under 'MURA' from Nov 16, 2023.

## SEC filing metadata
- accession: 0000950170-23-056978
- form_type: 8-K
- ticker: ALKS
- cik: 0001520262
- company_name: Alkermes plc.
- filed_at: 2023-10-31T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 7.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1520262/000095017023056978/0000950170-23-056978-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1520262/000095017023056978/alks-20231031.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-23-056978
- JSON: https://secwatch.observer/filing/0000950170-23-056978.json
- Plain text: https://secwatch.observer/filing/0000950170-23-056978.txt

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