---
schema_version: "secwatch.filing_event.v1"
accession: "0000874501-25-000015"
form_type: "8-K"
ticker: "OSG"
cik: "0000874501"
company_name: "OCTAVE SPECIALTY GROUP INC"
filed_at: "2025-02-26T23:59:59+00:00"
generated_at: "2026-05-26T04:12:17.064554+00:00"
event_type: "earnings"
sentiment: "negative"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Ambac Q4 net loss $548M on $570M legacy sale charge; P&C premiums up 88%

## Summary
- Continuing ops net loss $22M ($0.70 diluted); adjusted EBITDA $5.1M vs -$3.5M prior year.
- Legacy sale to Oaktree for $420M expected to close Q1/Q2 2025 pending Wisconsin approval; $570M disposal loss.
- Specialty P&C insurance production rose 88% to $265M; combined ratio improved to 96.5%.
- Insurance Distribution revenue up 257% to $44M; Cirrata adj. EBITDA to Ambac shareholders $5.3M.
- Stock buybacks: 962K shares at $12.48 in Q4, plus 240K in Q1 2025; $35M authority remaining.

## SEC filing metadata
- accession: 0000874501-25-000015
- form_type: 8-K
- ticker: OSG
- cik: 0000874501
- company_name: OCTAVE SPECIALTY GROUP INC
- filed_at: 2025-02-26T23:59:59+00:00
- event_type: earnings
- sentiment: negative
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/874501/000087450125000015/0000874501-25-000015-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/874501/000087450125000015/ambc-20250226.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000874501-25-000015
- JSON: https://secwatch.observer/filing/0000874501-25-000015.json
- Plain text: https://secwatch.observer/filing/0000874501-25-000015.txt

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