---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-23-064005"
form_type: "8-K"
ticker: "ALKS"
cik: "0001520262"
company_name: "Alkermes plc."
filed_at: "2023-11-15T23:59:59+00:00"
generated_at: "2026-06-08T02:20:26.859459+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Alkermes completes spin-off of oncology business into Mural; raises 2023 guidance

## Summary
- On Nov 15, 2023, distributed 1 Mural share for every 10 Alkermes shares; MURA begins trading Nov 16.
- FY2023 GAAP net income guidance raised to $250M–$280M from $225M–$265M; diluted EPS $1.46–$1.63.
- Non-GAAP net income guidance raised to $270M–$300M from $230M–$270M; diluted EPS $1.57–$1.75.
- Alkermes capitalized Mural with $275M cash; now a pure-play neuroscience company.
- Operating expenses expected to drop ~$20M in last six weeks of 2023 due to separation.

## SEC filing metadata
- accession: 0000950170-23-064005
- form_type: 8-K
- ticker: ALKS
- cik: 0001520262
- company_name: Alkermes plc.
- filed_at: 2023-11-15T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 2.01, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1520262/000095017023064005/0000950170-23-064005-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1520262/000095017023064005/alks-20231113.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-23-064005
- JSON: https://secwatch.observer/filing/0000950170-23-064005.json
- Plain text: https://secwatch.observer/filing/0000950170-23-064005.txt

## Key facts
- M&A Transactions
  Alkermes plc. completed a disposition involving Mural Oncology plc (closed 2023-11-15).
  - Action: disposition
  - Counterparty: Mural Oncology plc
  - Closing: 2023-11-15
  source text: on November 15, 2023, the Company completed the Separation and the Distribution.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1520262/000095017023064005/0000950170-23-064005-index.htm

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