Assets by plan
Share of aggregate retirement assets
Sponsor portfolioTH
IRON MOUNTAIN INCORPORATED
EIN 23-2588479designLatest filing 2025
Plans
3
Retirement
2
$1.07B assets
Welfare
1
$12.4M premiums
Participants
25,765
1101 ENTERPRISE DRIVE - ROYERSFORD, PA 19468855-462-7547ironmountains.comLinkedIn11-50 employeesdesign
Plans on this EIN
3 filingsRetirement portfolio analytics
2 plans aggregated / $1.07B assets / 14,023 participantsParticipants by plan
Active + retired + deferred vested
Benefits portfolio analytics
1 plan / $12.4M premiums / 28,620 covered livesCoverage by line
Premium dollars by benefit type (bundled lines overlap)
- Other$6.4M
- Life$5.6M
- Long-term disability$5.6M
- Health$5.2M
- Vision$919K
- Dental$70K
Carrier market share
Premium dollars by Schedule A carrier
45%top
- THE LINCOLN NATIONAL LIFE INSURANCE COMPANY45%
- KAISER FOUNDATION HEALTH PLAN INC30%
- AETNA LIFE INSURANCE COMPANY13%
- VISION SERVICE PLAN7%
- TRIPLE S SALUD, INC.2%
- +3 more
Broker market share
Schedule A broker compensation
98%top
- MERCER HEALTH AND BENEFITS, LLC98%
- MARSH & MCLENNAN AGENCY LLC2%
Plan deep-dives
Per-plan teasers. The full analytics (fees vs peers, audit grade, trajectory, counterparties) live on each plan detail page.Retirement#001
THE IRON MOUNTAIN COMPANIES 401(K) PLAN
401k
Assets$1.07B
Participants13,975
Inside the deep dive
Fees vs peersAudit gradeAsset trajectoryContributionsSch C providers
Open plan deep dive
Retirement#005
THE IRON MOUNTAIN COMPANIES PUERTO RICO 401(K) PLAN
ProfitSharing
Assets$2.6M
Participants48
Inside the deep dive
Fees vs peersAudit gradeAsset trajectoryContributionsSch C providers
Open plan deep dive
Welfare#510
THE IRON MOUNTAIN COMPANIES WELFARE PLAN
Mixed - LINCOLN NATIONAL LIFE INSURANCE COMPANY
Premiums$12.4M
Covered lives28,620
Inside the deep dive
Premium breakdownCarriersBrokersCoverage stats
Open plan deep dive
Retirement plans2
| Plan # | Name | Type | Assets | Participants | Latest year | |
|---|---|---|---|---|---|---|
| 001 | THE IRON MOUNTAIN COMPANIES 401(K) PLAN | 401k | $1.07B | 13,975 | 2025 | |
| 005 | THE IRON MOUNTAIN COMPANIES PUERTO RICO 401(K) PLAN | ProfitSharing | $2.6M | 48 | 2025 |
Welfare plans1
| Plan # | Name | Funding | Carrier | Premiums | Covered | Latest year | |
|---|---|---|---|---|---|---|---|
| 510 | THE IRON MOUNTAIN COMPANIES WELFARE PLAN | Mixed | LINCOLN NATIONAL LIFE INSURANCE COMPANY | $12.4M | 28,620 | 2025 |
Retirement plans
Welfare plans