Mainwaring Family Foundation
Invitation OnlyWilmington, Delaware · EIN 82-2289585 · Private foundation
Grants paid (2025)$197K
Organizations funded10
Typical grant$12,000
Total assets$24.7M
Half of its grants to organizations were between $10,000 and $15,000.
From the return
How to apply
On its return for tax year 2025 the foundation checked the box saying it only makes contributions to preselected charitable organizations and does not accept unsolicited requests for funds.
What it funds
Share of grant lines on the latest return, classified from the purpose each grant states.
Where it gives
100% of grants went outside Delaware.
Grants paid in tax year 2025
| Recipient | Location | Purpose | Amount |
|---|---|---|---|
| Helena Symphony | Helena, MT | Unrestricted gift | $65,000 |
| Holter Museum of Art | Helena, MT | General purpose | $45,000 |
| American Prairie Foundation | Bozeman, MT | General purpose | $15,000 |
| Prickly Pear Land Trust | Helena, MT | General purpose | $15,000 |
| Helena Food Share | Helena, MT | General purpose | $12,000 |
| Montana Food Bank Network | Missoula, MT | General purpose | $12,000 |
| Glacier Two Medicine Alliance | East Glacier Park, MT | General purpose | $10,000 |
| Planned Parenthood of Montana | Billings, MT | General purpose | $10,000 |
| Omerta Arts Syndicate | Helena, MT | General | $7,538 |
| H-Town Eagles Boxing Club | Helena, MT | General | $5,000 |
Giving by year
| Tax year | Grants paid | Grant lines |
|---|---|---|
| 2025 | $196,538 | 10 |
| 2024 | $178,112 | 8 |
| 2023 | $176,422 | 10 |
Sources
- IRS Form 990-PF, tax year 2025, filed May 12, 2026 - IRS e-file batch, object ID 202631329349102318
- IRS Tax Exempt Organization Search for EIN 82-2289585
- Profile updated Nov 5, 2026
Facts on this page come from the foundation's own IRS Form 990-PF filings as published by the IRS. Grantvello does not know whether a foundation is accepting proposals right now: a past grant is not an open opportunity. Always confirm current guidelines with the funder before applying.