William H Miller III Foundation Inc
William H Miller III Foundation Inc is a private foundation, based in West Palm Beach, FL. IRS filing data is available from 2022 through 2025. As of 2025, the organization holds $54.2M in total assets. In 2025, it awarded 5 grants totaling $7.9M. Net investment income was $201K.
William H Miller III Foundation Inc at a glance
In short: William H Miller III Foundation Inc gave $7.9M across 5 grants in 2025 (avg $1.6M), mostly in New Mexico. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $7,914,125
- +445.8% vs 2024
- Grants made (2025)
- 5
- +25.0% vs 2024
- Average grant
- $1,582,825
- +336.6% vs 2024
- Median grant
- $50,000
- Total assets
- $54,175,952
- -21.2% vs 2024
- Primary geography
- New Mexico (98% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated September 2026.
Who William H Miller III Foundation Inc funds
How this funder distributes its grants
Top Recipients
Top 5 recipients in 2025
The largest 2025 recipient was Santa Fe Institute ($7.7M). Together the top 5 received $7.9M.
Grant Size Distribution
10 grants across all recorded years
The most common grant size was in the $100–250K range: 4 grants of 10 (40%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 5 itemized grants.
Cities
How William H Miller III Foundation Inc gives
- In 2025 it paid out 266% of its IRS minimum distribution (the 5% rule). Method
From the foundation's IRS Form 990-PF filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2023 to 2025, annual grant giving ranged from $100K (2023) to $7.9M (2025). In 2025 it made 5 grants totaling $7.9M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Santa Fe Institute Santa Fe, NM | General Support | $7,724,125 |
| Stanford University - Leland Stanford Junior University Standford, CA | General Support | $100,000 |
| Barcs Baltimore, MD | General Support | $50,000 |
| Aha Foundation Bethesda, MD | General Support | $25,000 |
| United Way of Central Maryland Baltimore, MD | General Support | $15,000 |
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Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Qualifying Distributions | Net Investment Income | Distributable Amount |
|---|---|---|---|---|---|---|---|---|
| 2025 | $54,175,952 | $257,278 | $7,975,342 | $7,914,125 | 5 | $7,918,575 | $200,511 | $2,972,476 |
| 2024 | $68,783,640 | $1,851,642 | $1,622,673 | $1,450,000 | 4 | $1,459,619 | $1,688,588 | $2,967,367 |
| 2023 | $34,368,824 | $5,464,732 | $158,701 | $100,000 | 1 | $115,520 | $175,151 | $1,440,555 |
| 2022 | $20,345,405 | $20,659,427 | — | — | — | — | — | $72,746 |
Under IRS private-foundation payout rules, William H Miller III Foundation Inc reported a distributable amount of $3.0M for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
William H Miller III Foundation Inc is led by Heather Miller, President & Director on every filing since 2024; none of the 4 officers listed in 2025 report compensation.
Officers on the 2025 filing
Heather Miller
President & Director
On filings since 2024
No compensation reported
William H. Miller III
Chairman & Director
Chairman of the Board → Chairman, Treasurer & Director, 2024
Chairman, Treasurer & Director → Chairman & Director, 2025
On filings since 2022
No compensation reported
Kristi Adkins
Treasurer & Director
Secretary & Director → Treasurer & Director, 2025
On filings since 2024
No compensation reported
Justine Harrison
Secretary & Director
New on the 2025 filing
No compensation reported
Former officers (2)
- Former: Heather Murren (2022–2023) — President & Director
- Former: Sue Ann Miller (2022–2023) — Secretary & Director
Data from IRS Form 990 filings, 2022–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Frequently asked questions about William H Miller III Foundation Inc
How much does William H Miller III Foundation Inc give each year?
William H Miller III Foundation Inc gave $7.9M across 5 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $1.4M across 4 grants.
What is William H Miller III Foundation Inc's typical grant size?
William H Miller III Foundation Inc's median grant in 2025 was $50,000, and its average grant was $1,582,825, across 5 grants on its 2025 IRS Form 990-PF.
Where does William H Miller III Foundation Inc give grants?
William H Miller III Foundation Inc gives mostly in New Mexico: 98% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The most frequent recipient cities were Baltimore, MD (2 grants).
Does William H Miller III Foundation Inc give general operating support?
Yes: 100% of William H Miller III Foundation Inc's 2025 grants with a stated purpose (5 of 5) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are William H Miller III Foundation Inc's largest grantees?
William H Miller III Foundation Inc's largest 2025 grantees include Santa Fe Institute ($7,724,125), Stanford University - Leland Stanford Junior University ($100,000) and Barcs ($50,000), according to its 2025 IRS Form 990-PF. Together they received 99% of its itemized 2025 grant dollars.
How large is William H Miller III Foundation Inc?
William H Miller III Foundation Inc reported $54.2M in total assets on its 2025 IRS Form 990-PF. It paid out $7.9M in qualifying distributions that year, against a required minimum of $3.0M (roughly 5% of its investment assets).
What is William H Miller III Foundation Inc's EIN?
William H Miller III Foundation Inc's EIN (Employer Identification Number) is 92-1047594. IRS Form 990 filing data is available on this page for 2022–2025.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Data update history
(5)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2022 (received by the IRS November 14, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS November 5, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS May 15, 2025)
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 13, 2026)
- IRS filings on file for fiscal years 2022–2024
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