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Sponsor portfolioTH

AON CORPORATION

EIN 36-3051915-Finance and Insurance-Latest filing 2025
Plans
8
Retirement
2
$8.89B assets
Welfare
6
$54.0M premiums
Participants
57,624
MSC# 17755, VANGUARD P.O. BOX 551343 - ATLANTA, GA 30355312-381-1000
Plans on this EIN
8 filings
#020401k-$7.42B - 24,043 part#090CashBalance-$1.47B - 13,598 part#501Fully Insured-$52.6M - 18,262 lives#506Fully Insured-$707K - 120 lives#517Fully Insured-$624K - 130 lives#513Fully Insured-$44K - 211 lives#504Self Funded-0 lives#599Self Funded-0 lives

Retirement portfolio analytics

2 plans aggregated / $8.89B assets / 37,641 participants

Assets by plan

Share of aggregate retirement assets

83%top
  • AON Savings (#020)83%
  • AON RETIREMENT PENSION (#090)17%
Total $8.89BClick slice to drill in

Recordkeeper share

DC plan assets by Schedule C recordkeeper

Entrenched
83%top
  • THE VANGUARD GROUP, INC.83%
  • (Not disclosed)17%
Total $8.89BClick slice to drill in

Participants by plan

Active + retired + deferred vested

  • AON Savings (#020)24,043
  • AON RETIREMENT PENSION (#090)13,598
Total 37,641Click row to drill in

Benefits portfolio analytics

6 plans / $54.0M premiums / 18,723 covered lives

Coverage by line

Premium dollars by benefit type (bundled lines overlap)

  • Dental$15.6M
  • Life$14.4M
  • Health$14.2M
  • Other$8.2M
  • Vision$6.8M
  • Long-term disability$3.3M
  • +1 more
Total $54.0M7 rows

Carrier market share

Premium dollars by Schedule A carrier

Multi-vendor
32%top
  • METROPOLITAN LIFE INSURANCE COMPANY32%
  • HARTFORD LIFE AND ACCIDENT15%
  • KAISER FOUNDATION HEALTH PLAN INC15%
  • DELTA DENTAL OF CALIFORNIA8%
  • CIGNA HEALTH AND LIFE INSURANCE COMPANY5%
  • +3 more
Total $54.0M8 slices

Broker market share

Schedule A broker compensation

Split broker
68%top
  • AON CONSULTING INC68%
  • CUSTOM BENEFIT PROGRAMS INC26%
  • HEWITT INSURANCE BROKERAGE LLC5%
  • JENNIFER N BUCK1%
  • JENNIFER BUCK0%
Total $2.8M5 slices

Plan deep-dives

Per-plan teasers. The full analytics (fees vs peers, audit grade, trajectory, counterparties) live on each plan detail page.
Retirement#020

AON SAVINGS PLAN

401k

Assets$7.42B
Participants24,043
Inside the deep dive
Fees vs peersAudit gradeAsset trajectoryContributionsSch C providers
Open plan deep dive
Retirement#090

AON RETIREMENT PENSION PLAN

CashBalance

Assets$1.47B
Participants13,598
Inside the deep dive
Fees vs peersAudit gradeAsset trajectoryContributionsSch C providers
Open plan deep dive
Welfare#501

AON BENEFIT PLAN

Fully Insured - METROPOLITAN LIFE INSURANCE COMPANY

Premiums$52.6M
Covered lives18,262
Inside the deep dive
Premium breakdownCarriersBrokersCoverage stats
Open plan deep dive
Welfare#506

AHCS RETIREE BENEFITS PLAN

Fully Insured - BLUECROSS AND BLUESHIELD OF ILLINOIS

Premiums$707K
Covered lives120
Inside the deep dive
Premium breakdownCarriersBrokersCoverage stats
Open plan deep dive
Welfare#517

ASA POST RETIREMENT HEALTH PLAN

Fully Insured - BLUECROSS AND BLUESHIELD OF ILLINOIS

Premiums$624K
Covered lives130
Inside the deep dive
Premium breakdownCarriersBrokersCoverage stats
Open plan deep dive
Welfare#513

ALEXANDER & ALEXANDER SERVICES INC. POST-RETIREMENT DEATH BENEFIT PLAN

Fully Insured - HARTFORD LIFE AND ACCIDENT

Premiums$44K
Covered lives211
Inside the deep dive
Premium breakdownCarriersBrokersCoverage stats
Open plan deep dive
Welfare#504

ALEXANDER & ALEXANDER SERVICES, INC. DISABILITY BENEFITS PLAN

Self Funded

Premiums$0
Covered lives0
Inside the deep dive
Premium breakdownCarriersBrokersCoverage stats
Open plan deep dive
Welfare#599

AON HEALTH REIMBURSEMENT ARRANGEMENT PLAN

Self Funded

Premiums$0
Covered lives0
Inside the deep dive
Premium breakdownCarriersBrokersCoverage stats
Open plan deep dive

Retirement plans2

Plan #NameTypeAssetsParticipantsLatest year
020AON SAVINGS PLAN401k$7.42B24,0432025
090AON RETIREMENT PENSION PLANCashBalance$1.47B13,5982024

Welfare plans6

Plan #NameFundingCarrierPremiumsCoveredLatest year
501AON BENEFIT PLANFully InsuredMETROPOLITAN LIFE INSURANCE COMPANY$52.6M18,2622024
506AHCS RETIREE BENEFITS PLANFully InsuredBLUECROSS AND BLUESHIELD OF ILLINOIS$707K1202024
517ASA POST RETIREMENT HEALTH PLANFully InsuredBLUECROSS AND BLUESHIELD OF ILLINOIS$624K1302024
513ALEXANDER & ALEXANDER SERVICES INC. POST-RETIREMENT DEATH BENEFIT PLANFully InsuredHARTFORD LIFE AND ACCIDENT$44K2112024
504ALEXANDER & ALEXANDER SERVICES, INC. DISABILITY BENEFITS PLANSelf Funded-$002024
599AON HEALTH REIMBURSEMENT ARRANGEMENT PLANSelf Funded-$002024
Retirement plans
Welfare plans
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