---
schema_version: "secwatch.filing_event.v1"
accession: "0001628280-25-050666"
form_type: "8-K"
ticker: null
cik: "0001567892"
company_name: "Keenova Therapeutics plc"
filed_at: "2025-11-07T23:59:59+00:00"
generated_at: "2026-05-16T23:04:26.214230+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Mallinckrodt changes fiscal year end to calendar year from late-December fiscal year

## Summary
- Fiscal year end shifts from last Friday of December to December 31, effective prospectively.
- No transition report required; change adds 5 operating days in FY2025 and 2 in FY2026.
- FY2025 annual report covers Dec 28, 2024 to Dec 31, 2025.
- Quarterly periods in FY2026 will have different operating days, affecting comparability.

## SEC filing metadata
- accession: 0001628280-25-050666
- form_type: 8-K
- cik: 0001567892
- company_name: Keenova Therapeutics plc
- filed_at: 2025-11-07T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 5.03
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1567892/000162828025050666/0001628280-25-050666-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1567892/000162828025050666/mnk-20251107.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001628280-25-050666
- JSON: https://secwatch.observer/filing/0001628280-25-050666.json
- Plain text: https://secwatch.observer/filing/0001628280-25-050666.txt

## Key facts
- Governance Changes
  Keenova Therapeutics plc: Company changed fiscal year end from a 52-53 week year ending on the last Friday of December to a calendar year ending on December 31 (effective 2025-11-07).
  - Change: fiscal year change
  - Effective: 2025-11-07
  source text: On November 7, 2025, Mallinckrodt plc (the “Company”) determined to change the Company’s fiscal year end from a 52-53 week year ending on the last Friday of December to a calendar year ending on December 31.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1567892/000162828025050666/0001628280-25-050666-index.htm

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