Updated Oct 30, 2026
Private foundations based in Key Biscayne, Florida
5 grantmaking foundations headquartered in Key Biscayne, Florida, holding $20M in assets. Ranked by grants paid in their latest 990-PF; 0 on this page say they accept applications. For foundations ranked by where their grants went, see local funders.
| Foundation | Grants paid | Median grant | Accepts applications | Assets |
|---|---|---|---|---|
| Joseph & Sally Handleman Charitable Foundation Trust Csince 1998 | $1.6M26 grants · 2025 | $20K | Preselected only | $6.4M |
| The Nommontu Foundation Incsince 2001 | $662K19 grants · 2025 | $25K | Preselected only | $7.7M |
| Mackworth-Mendoza Foundtionsince 2002 | $580K7 grants · 2025 | $5,000 | Preselected only | $1.0M |
| Wilder Foundationsince 1947 | $99K8 grants · 2025 | $5,825 | Preselected only | $2.5M |
| Siavosh Bozorgi Family Foundationsince 1993 | $84K10 grants · 2025 | $3,500 | Preselected only | $2.1M |
Sources: IRS Business Master File (assets), ProPublica Nonprofit Explorer and IRS 990-PF e-file (grants paid, application policy). "Accepts applications" reflects the foundation's own Part XV checkbox.
Open grant programs in Florida
All 2| Deadline | Grant | Funder | Award ceiling |
|---|---|---|---|
| Rollingno deadline | Florida Division of Arts and Culture — Organizational GrantsStateFlorida Division of Arts and Culture | Florida Division of Arts and Culture | Not listed |
| Rollingno deadline | Florida Humanities — Humanities GrantsStateFlorida Humanities | Florida Humanities | Not listed |
Common questions
How many private foundations are based in Key Biscayne, Florida?
Our directory lists 5 private grantmaking foundations in Key Biscayne, Florida with at least $1 million in assets, holding a combined $20M. The data comes from the IRS Exempt Organizations Business Master File and Form 990-PF.
How do I get a grant from a private foundation?
Start with foundations that already fund organizations like yours nearby. Read the grantee list on each profile, check whether the foundation accepts applications (it says so on its 990-PF), and lead with a short letter of inquiry. Many family foundations fund only organizations they already know; an introduction through a shared grantee or board member works better than a cold proposal.
Can you help us approach foundations?
Yes. Our grant writers research foundation prospects, write letters of inquiry, and build a foundation fundraising plan. Request a free consultation.