Janet and Robert W Postma Foundation
Invitation OnlyWater Mill, New York · EIN 85-3636639 · Private foundation
Half of its grants to organizations were between $5,000 and $14,000.
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
10% of grants went outside New York.
Grants paid in tax year 2025
| Recipient | Location | Purpose | Amount |
|---|---|---|---|
| Southhampton Hospital Foundation | Southampton, NY | Tax Exempt Contribution | $100,000 |
| North Sea Maritime Center | Southampton, NY | Tax Exempt Contribution | $51,500 |
| HSS Foundation | New York, NY | Tax Exempt Contribution | $51,000 |
| EEDA Foundation | Riverhead, NY | Tax Exempt Contribution | $20,000 |
| Ichan School of Medicine | New York, NY | Tax Exempt Contribution | $15,000 |
| Sag Harbor Lions Club Pierson Schol | Sag Harbor, NY | Tax Exempt Contribution | $14,000 |
| MET PGA Foundation | Elmsford, NY | Tax Exempt Contribution | $11,000 |
| SNACK Friends | New York, NY | Tax Exempt Contribution | $11,000 |
| AJJ Scholarship Fund | Speonk, NY | Tax Exempt Contribution | $10,000 |
| Carmel Connection Foundation | Point Pleasant Beach, NJ | Tax Exempt Contribution | $10,000 |
| Retreat Inc | East Hampton, NY | Tax Exempt Contribution | $10,000 |
| Tomorrows Hope Foundation | Rockville Centre, NY | Tax Exempt Contribution | $10,000 |
| Break WaterSailing Club | Sag Harbor, NY | Tax Exempt Contribution | $9,300 |
| SCO Family of Services | Garden City, NY | Tax Exempt Contribution | $8,250 |
| Bridgehampton Lions Club | Bridgehampton, NY | Tax Exempt Contribution | $5,000 |
| Road Forward Scholarship Fund | Bridgehampton, NY | Tax Exempt Contribution | $5,000 |
| East Islip Soccer Club | East Islip, NY | Tax Exempt Contribution | $2,500 |
| Kiwanis Club of Southhampton | Southampton, NY | Tax Exempt Contribution | $2,500 |
| 625 Foundation | Rupert, VT | Tax Exempt Contribution | $1,700 |
| MGA Caddie Scholarship Fund | Elmsford, NY | Tax Exempt Contribution | $250 |
The return also lists 11 grants to individuals ($121,000). We do not publish the names of individual recipients.
Giving by year
| Tax year | Grants paid | Grant lines |
|---|---|---|
| 2025 | $469,000 | 31 |
| 2024 | $422,250 | 31 |
| 2023 | $101,000 | 15 |
Sources
- IRS Form 990-PF, tax year 2025, filed May 14, 2026 - IRS e-file batch, object ID 202621349349104257
- IRS Tax Exempt Organization Search for EIN 85-3636639
- Profile updated Nov 6, 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.