William & Claire Dart Foundation
William & Claire Dart Foundation is a private foundation focused on Philanthropy, based in Mason, MI. IRS filing data is available from 2020 through 2024. As of 2024, the organization holds $51.7M in total assets. In 2024, it awarded 5 grants totaling $3.9M. Net investment income was $1.4M.
William & Claire Dart Foundation at a glance
In short: William & Claire Dart Foundation gave $3.9M across 5 grants in 2024 (avg $780K), mostly in Michigan. Source: 2024 IRS Form 990-PF.
- Annual giving (2024)
- $3,900,000
- +16.4% vs 2023
- Grants made (2024)
- 5
- -16.7% vs 2023
- Average grant
- $780,000
- +39.7% vs 2023
- Median grant
- $700,000
- Total assets
- $51,714,858
- +19.5% vs 2023
- Primary geography
- Michigan (100% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990-PF, 2024 View filing
Data from IRS Form 990-PF, 2024; updated September 2026.
Who William & Claire Dart Foundation funds
How this funder distributes its grants
Top Recipients
Top recipient in 2024
The largest 2024 recipient was Dart Foundation ($3.9M across 5 grants).
Grant Size Distribution
18 grants across all recorded years
The most common grant size was in the $500K–1M range: 7 grants of 18 (39%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2024 grant dollars across all 5 itemized grants.
Cities
How William & Claire Dart Foundation gives
- Giving grew 218% from 2021 to 2024. Method
- In 2024 it paid out 138% 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 2020 to 2024, annual grant giving ranged from $1.2M (2020) to $3.9M (2024). In 2024 it made 5 grants totaling $3.9M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Dart Foundation Mason, MI | General Support | $1,500,000 |
| Dart Foundation Mason, MI | General Support | $900,000 |
| Dart Foundation Mason, MI | General Support | $700,000 |
| Dart Foundation Mason, MI | General Support | $400,000 |
| Dart Foundation Mason, MI | General Support | $400,000 |
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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 |
|---|---|---|---|---|---|---|---|---|
| 2024 | $51,714,858 | $12,404,368 | $3,948,037 | $3,900,000 | 5 | $3,903,037 | $1,374,368 | $2,821,803 |
| 2023 | $43,258,527 | $5,568,572 | $3,358,195 | $3,350,000 | 6 | $3,358,195 | $568,572 | $1,219,473 |
| 2022 | $21,237,055 | $167,007 | $2,800,391 | $2,800,000 | 2 | $2,800,391 | $456,931 | $1,036,861 |
| 2021 | $23,870,439 | $981,370 | $1,254,437 | $1,225,000 | 3 | — | $132,076 | $1,221,150 |
| 2020 | $24,143,506 | $391,426 | $1,225,267 | $1,225,000 | 2 | — | $391,426 | $1,221,027 |
Under IRS private-foundation payout rules, William & Claire Dart Foundation reported a distributable amount of $2.8M for 2024 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
William & Claire Dart Foundation is led by James D Lammers, Vie President, Secretary & Treasurer since 2023 (on filings since 2020); none of the 2 officers listed in 2024 report compensation.
Officers on the 2024 filing
James D Lammers
Vie President, Secretary & Treasurer
Secretary → Secretary & Director, 2021
Secretary & Director → Vie President, Secretary & Treasurer, 2023
On filings since 2020
No compensation reported
Kenneth B Dart
President
Director → President & Director, 2023
President & Director → President, 2024
On filings since 2020
No compensation reported
Former officers (3)
- Former: Claire T Dart (2020–2023) — Vice President & Director
- Former: Francis X Liesman II (2020–2023) — Assistant Secretary
- Former: Robert C Dart (2020–2023) — President, Treasurer & Director
Data from IRS Form 990 filings, 2020–2024. "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 & Claire Dart Foundation
How much does William & Claire Dart Foundation give each year?
William & Claire Dart Foundation gave $3.9M across 5 grants in 2024, according to its 2024 IRS Form 990-PF. In 2023 it gave $3.4M across 6 grants.
What is William & Claire Dart Foundation's typical grant size?
William & Claire Dart Foundation's median grant in 2024 was $700,000, and its average grant was $780,000, across 5 grants on its 2024 IRS Form 990-PF.
Where does William & Claire Dart Foundation give grants?
William & Claire Dart Foundation gives mostly in Michigan: 100% of the grant dollars itemized on its 2024 IRS Form 990-PF went to recipients there. The most frequent recipient cities were Mason, MI (5 grants).
Does William & Claire Dart Foundation give general operating support?
Yes: 100% of William & Claire Dart Foundation's 2024 grants with a stated purpose (5 of 5) were for general or operating support, per its 2024 IRS Form 990-PF.
How large is William & Claire Dart Foundation?
William & Claire Dart Foundation reported $51.7M in total assets on its 2024 IRS Form 990-PF. It paid out $3.9M in qualifying distributions that year, against a required minimum of $2.8M (roughly 5% of its investment assets).
What is William & Claire Dart Foundation?
William & Claire Dart Foundation is a private foundation focused on Philanthropy, based in Mason, MI. It holds $51.7M in total assets as of 2024.
What is William & Claire Dart Foundation's EIN?
William & Claire Dart Foundation's EIN (Employer Identification Number) is 38-2562664. IRS Form 990 filing data is available on this page for 2020–2024.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Data update history
(1)
When this profile's IRS filing data changed on Grantable
- IRS filings on file for fiscal years 2020–2024
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