401(k) · DOL Form 5500 · 2022
Aon Corporation 401(k) Plan
Data updated 2026-08-06
- $5.4B
- Total assets
- 12,608
- Participants
- 100th
- Percentile by assets
- $429,847
- Avg per participant
Official DOL plan name: Aon Savings Plan · Sponsored by Aon Corporation · Illinois · Finance & Insurance
$5.4B in assets, 12,608 participants
Aon Corporation's Aon Savings Plan reported $5.4B in total assets and 12,608 participants in its 2022 DOL Form 5500 filing, ranking in the 100th percentile by assets among filed plans. Figures are as reported by the plan sponsor to the Department of Labor, not audited or endorsed by PlainRetire.
- 100th percentile by assets (of 139,258 plans)
- #9,229 in Finance & Insurance (9,267 peers)
Coverage in Illinois
Aon Savings Plan covers 12,608 participants in Illinois, 16x the typical Illinois plan (state average ~768 per filing). Assets: $5.4B.
- $5.4B
- total plan assets (2022 EOY)
- 12,608
- covered participants
- 100th
- percentile by assets (of 139,258 plans)
- $429,847
- avg assets per participant
The plan reported a net loss of $1.2B for the year, a single-year figure driven by markets and benefit payments, not a measure of plan health.
Participants vs Illinois filers
In Illinois, the average filing covers about 768 participants across 5,440 plans. Aon Savings Plan reports 12,608 participants - 16x that state average ($5.4B EOY assets).
Illinois filing particulars
| Total Assets (Beginning of Year) | $6.5B |
|---|---|
| Net Assets (End of Year) | $5.3B |
| Net Income | -$1.2B |
| Employer EIN | 363051915 |
| Plan Effective Date | 1984-07-01 |
| Filing Status | FILING RECEIVED |
Sponsor Plan History (Aon Corporation)
| Year | Plans | Participants | Total Assets |
|---|---|---|---|
| 2022 | 3 | 14,536 | $6.9B |
| 2023 | 2 | 15,754 | $7.8B |
| 2024 | 2 | 15,620 | $8.2B |
Nearby 401(k) Plans in Illinois
Peer 401(k) plans, same state, same plan type, ranked by total assets.
Aon Savings Plan vs. nearby 401(k) plans in Illinois, assets vs. participants
- State Farm 401(k) Savings Plan $14.7B · 53,616
- Accenture United States 401(k) Match and Savings Plan $14.3B · 66,653
- Abbott Laboratories Stock Retirement Plan $13.3B · 36,136
- United Airlines Pilot Retirement Account Plan $11.8B · 13,437
- Walgreens Retirement Savings Plan $11.7B · 238,072
Scale composition for Aon Savings Plan
Aon Savings Plan reports $5.4B in end-of-year assets across 12,608 participants (0.047% of the $11.6T held by all Form 5500 filers in the national rollup , and 0.014% of 89,805,449 covered participants) - about $429,847 per participant (3.1x the national average assets-per-participant) . Net income for plan year 2022 was -$1.2B.
This plan identity (EIN 363051915, plan #020) has 3 Form 5500 filings on file from 2022 to 2024 , with end-of-year assets moving from $5.4B to $6.7B (+23.7%) while covered participants moved from 12,608 to 13,974 . Single-year sparse filers cannot show that trail.
| Plan year | Participants | EOY assets | Filing |
|---|---|---|---|
| 2022 | 12,608 | $5.4B | This page |
| 2023 | 13,948 | $6.2B | Open filing |
| 2024 · index core | 13,974 | $6.7B | Open filing |
The same sponsor also keeps 2 other index-core plans on PlainRetire:
- Aon Savings Plan (401(k), $6.7B, 13,974 participants)
- Aon Retirement Pension Plan (Defined Benefit (Pension), $1.5B, 1,646 participants)
Similar-Sized 401(k) Plans Nationally
401(k) plans in other states closest to Aon Savings Plan by total assets, not by location.
- Nextera Energy, Inc. Employee Retirement Savings Plan (FL) $5.4B · 14,889
- Paramount Global 401(k) Plan (Fka Viacomcbs 401(k) Plan) (NY) $5.4B · 19,592
- Aecom Retirement & Savings Plan (TX) $5.5B · 16,940
- Stryker Corporation 401(k) Savings and Retirement Plan (MI) $5.3B · 22,221
Frequently Asked Questions
How did Aon Savings Plan assets move in 2022? ▼
How have Aon Corporation plan assets changed over time? ▼
Where does Aon Savings Plan rank by assets among Form 5500 filers? ▼
Which 401(k) plans are similar in size to Aon Savings Plan? ▼
Next read for Aon Savings Plan
Filing takeaways
Ways to act on Aon Savings Plan's numbers.
- By total assets, Aon Savings Plan ranks among the largest 1% of all filed plans. See the largest plans
- Compare it side-by-side against 3 similar 401(k) plans in Illinois. Compare plans
- Aon Corporation's sponsor-wide assets have grown 17.9% since 2022 across 3 plan years on file. More Finance & Insurance plans