401(k) · DOL Form 5500 · 2022
Aon Corporation 401(k) Plan
Data updated 2026-08-25
- $5.4B
- Total assets Very large vs avg
- 12,608
- Participants Very large workforce
- 100th
- Percentile by assets National rank
- $429,847
- Avg per participant High balance/head
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.
- #9,223 in Finance & Insurance (9,261 peers)
Coverage in Illinois
Aon Savings Plan covers 12,608 participants in Illinois, 16x the typical Illinois plan (state average ~779 per filing). Assets: $5.4B.
- #9,223
- in Finance & Insurance (9,261 peers)
- -17.0%
- assets change YoY
- 54×
- vs typical plan assets (national mean)
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.
Aon Savings Plan's outsized position by total assets
Aon Savings Plan vs every filed plan by assets
End-of-year total assets · plan year 2022 · DOL Form 5500
$5,419,516,504 Highest reported value at or above every one of 139,123 filed plans
Dashed line + filled bar = this entry, among filed plans.
Source U.S. Department of Labor Form 5500 filings (EBSA) · plan year 2022
Aon Savings Plan's mega-plan peer group by participant headcount
Plan-year 2022 Form 5500 filings with a reported participant count, partitioned by headcount band, not by assets. Aon Savings Plan is a mega filing (12,608 participants), the rightmost band on the breakdown.
DOL schedule card
Filing strip 363051915 · Aon Corporation PY 2022 · 401(k)
Aon Savings Plan · $5.4B · 12,608 · 100th
- EIN $5.4B
- EIN 12,608
- EIN 100th
- EIN 401(k)
- EIN near Nextera Energy, Inc. Employee Retirement Savings Plan
- EIN ind #9223
Stamps derive from this plan's Form 5500 line items (assets, participants, type, EIN, cohort placement) - not a quality rating of the sponsor. Read with Finance & Insurance retirement plans → · Plans in Illinois →
Aon Savings Plan in the asset neighbourhood
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)
Sponsor-wide plan assets over time
All Aon Corporation plans reported in each filing year
- Latest sponsor-wide plan assets
- $8.2B 17.932500979716092% vs 2022
- 2024 filing year
| 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.
- 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 (0.044% of the $12.3T held by all Form 5500 filers in the national rollup , and 0.013% of 93,925,755 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)
Aon Savings Plan's out-of-state 401(k) peers by assets and headcount
Outside Illinois, the nearest 401(k) by assets is Nextera Energy, Inc. Employee Retirement Savings Plan in FL ($5.4B); by covered participants it is Thoroughbred Retirement Investment Plan of Norfolk Southern Corporation and Participating Subsidiary Companies in GA (12,606 participants). Same-state nearby plans are listed separately above.
Closest by plan assets
Nearest other-state filings by tot_assets_eoy ($5.4B here).
- 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
Similar participant headcount
Nearest other-state filings by covered participants (12,608 participants); asset peers above are excluded.
- Thoroughbred Retirement Investment Plan of Norfolk Southern Corporation and Participating Subsidiary Companies (GA) 12,606 · 2 off
- The Equinox Holdings, Inc. 401(k) Plan (NY) 12,606 · 2 off
- Corning Incorporated Investment Plan (NY) 12,615 · 7 off
- Scl Health 401(k) Retirement Savings Plan (CO) 12,642 · 34 off
DOL Form 5500 plan year 2022. Asset totals can differ widely at the same headcount; neither axis is a quality rating.