Aon Corporation
Chicago, IL
Aon Corporation of Chicago, IL is the broker of record on 162 Form 5500 Schedule A filings covering 99 employer benefit plans across 30 states, with $6,014,941 in reported broker commissions (plan year 2025).
Quick answer
Aon Corporation (Chicago, IL) is the broker of record for 99 employer benefit plan sponsors on 162 Form 5500 Schedule A filings, plan year 2025.
- How many employer clients does Aon Corporation have?
- Aon Corporation is named as broker on Form 5500 Schedule A filings for 99 distinct plan sponsors in 30 states.
- Who are Aon Corporation's largest employer clients?
- By plan participants, the largest include International Business Machines Corporation (216,044 participants), Oasis Outsourcing Holdings, Inc. (92,332 participants) and Laboratory Corporation Of America Holdings (55,823 participants).
- How much does Aon Corporation earn in commissions?
- Insurers reported $6 million in broker commissions and $221,117 in fees paid to Aon Corporation for plan year 2025, per Schedule A Part 1.
- Where is Aon Corporation located?
- Aon Corporation is based in Chicago, IL and has employer clients in 30 states.
- How does Aon Corporation rank among benefits brokers in Illinois?
- Aon Corporation ranks #28 by employer clients among the 50 most active benefits brokers based in Illinois.
Source: Fundz verified event record.
Employer clients
Plan sponsors naming Aon Corporation on a Form 5500 Schedule A, largest first. Sponsor name, state, participant count and plan year end come directly from the filing.
| Employer | State | Participants | Plan year end |
|---|---|---|---|
| International Business Machines Corporation | NY | 216,044 | 2024-12-31 |
| Oasis Outsourcing Holdings, Inc. | FL | 92,332 | 2025-12-31 |
| Laboratory Corporation Of America Holdings | NC | 55,823 | 2025-12-31 |
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Form 5500 Schedule A Part 1 (broker of record), 2024 to 2025 plan years. Source: U.S. Department of Labor EFAST2. Commission and fee figures are as reported by the plan's insurer on Schedule A Part 1 and are not adjusted.