---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-107960"
form_type: "8-K"
ticker: "SAFT"
cik: "0001172052"
company_name: "SAFETY INSURANCE GROUP INC"
filed_at: "2026-09-15T20:49:40+00:00"
generated_at: "2026-09-15T20:51:17.800693+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Safety Insurance HSR waiting period expires; MAPFRE merger on track

## Summary
- HSR waiting period for Safety-MAPFRE merger expired 11:59 p.m. ET on September 14, 2026, satisfying one closing condition.
- Closing still requires other regulatory approvals, including from the Massachusetts Commissioner of Insurance.
- Definitive proxy statement for the merger was mailed to Safety stockholders on September 14, 2026.
- Merger Sub will merge into Safety, which survives as a wholly owned MAPFRE U.S.A. Corp. subsidiary.

## SEC filing metadata
- accession: 0001104659-26-107960
- form_type: 8-K
- ticker: SAFT
- cik: 0001172052
- company_name: SAFETY INSURANCE GROUP INC
- filed_at: 2026-09-15T20:49:40+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1172052/000110465926107960/0001104659-26-107960-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1172052/000110465926107960/tm2625481d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-107960
- JSON: https://secwatch.observer/filing/0001104659-26-107960.json
- Plain text: https://secwatch.observer/filing/0001104659-26-107960.txt

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