Tax-exempt organization ยท Files a Form 5500
WILLIAM K WARREN FOUNDATION
PO BOX 470732, TULSA, OK 74147-0732
EIN
73-0609599
Tax-exempt status
501(c)(3) charitable, religious, educational
IRS · 2026-09
Deductibility
Contributions are deductible
IRS · 2026-09
Foundation classification
Private non-operating foundation
IRS · 2026-09
IRS ruling date
1947-01
IRS · 2026-09
NTEE code
T22
IRS · 2026-09
Latest tax period on file
2024-12
IRS · 2026-09
Assets (latest 990)
$331,363,796
IRS · 2026-09
Benefit plan 333, 2024 filing
THE WARREN EMPLOYEES' RETIREMENT PLAN
DOL · 2025-10-14
Participants (start of year)
128
DOL · 2025-10-14
Plan features
Defined benefit (cash balance)
DOL · 2025-10-14
Plan type
Multiple-employer plan
DOL · 2025-10-14
Business code (NAICS)
813000
DOL · 2025-10-14
Benefit plan 2, 2024 filing
THE WARREN EMPLOYEES 401(K) PLAN
DOL · 2025-10-08
Participants (start of year)
70
DOL · 2025-10-08