---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-375328"
form_type: "8-K"
ticker: "AON"
cik: "0000315293"
company_name: "Aon plc"
filed_at: "2026-08-31T10:37:01+00:00"
generated_at: "2026-08-31T11:00:26.177511+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.95
calibrated_materiality_score: 0.95
confidence: "high"
source: SEC EDGAR
---

# Aon to acquire USI for $17.0B cash, creating premier U.S. middle-market platform

## Summary
- Aon signs $17.0B cash deal for USI; net $16.7B after ~$278M tax attributes, ~14.5x synergized EBITDA.
- Expects $395M annual run-rate net adjusted EBITDA impact from revenue and cost synergies; accretive to adjusted EPS in 2028.
- USI is 10th largest U.S. broker with ~$3B revenue, 10,500+ staff, ~200 offices; expands Aon's E&S access.
- Mike Sicard to become President of Aon and global CEO of Middle Market, reporting to Greg Case.
- Funding via new debt; expects to keep Baa2/A- ratings; no near-term buybacks as it prioritizes de-leveraging.

## SEC filing metadata
- accession: 0001193125-26-375328
- form_type: 8-K
- ticker: AON
- cik: 0000315293
- company_name: Aon plc
- filed_at: 2026-08-31T10:37:01+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.95
- calibrated_materiality_score: 0.95
- confidence: high
- sec_items: 1.01, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/315293/000119312526375328/0001193125-26-375328-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/315293/000119312526375328/d108801d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-375328
- JSON: https://secwatch.observer/filing/0001193125-26-375328.json
- Plain text: https://secwatch.observer/filing/0001193125-26-375328.txt

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