Leiden Conservation Foundation
Leiden Conservation Foundation is a private foundation, based in Hunting Valley, OH. IRS filing data is available from 2019 through 2025. As of 2025, the organization holds $332K in total assets. In 2025, it awarded 5 grants totaling $586K. Net investment income was $286K.
Leiden Conservation Foundation at a glance
In short: Leiden Conservation Foundation gave $586K across 5 grants in 2025 (avg $117K), mostly in Wisconsin. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $585,571
- -17.4% vs 2024
- Grants made (2025)
- 5
- +0.0% vs 2024
- Average grant
- $117,114
- -17.4% vs 2024
- Median grant
- $20,048
- Total assets
- $331,502
- -35.4% vs 2024
- Primary geography
- Wisconsin (77% 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 Leiden Conservation Foundation funds
How this funder distributes its grants
Top Recipients
Top 5 recipients in 2025
The largest 2025 recipient was International Crane Foundation ($452K). Together the top 5 received $586K.
Grant Size Distribution
34 grants across all recorded years
The most common grant size was under $50K: 24 grants of 34 (71%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 5 itemized grants.
States
Cities
How Leiden Conservation Foundation gives
- Giving grew 49% from 2022 to 2025. Method
- In 2025 it paid out well above 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 2019 to 2025, annual grant giving ranged from $310K (2021) to $709K (2024). In 2025 it made 5 grants totaling $586K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| International Crane Foundation Baraboo, WI | Variety of Projects | $452,013 |
| Endangered Wildlife Trust South Africa, OH | Regional Resouce Center | $94,310 |
| Nelson Mandela University South Africa, OH | African Penguin Project | $20,048 |
| Akron Zoo Akron, OH | Variety of Projects | $16,000 |
| Lion Landscapes United Kingdom TQ U, OH | The Big Give | $3,200 |
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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 | $331,502 | $693,012 | $606,781 | $585,571 | 5 | $600,706 | $285,598 | $17,879 |
| 2024 | $512,884 | $1,061,971 | $713,371 | $708,502 | 5 | $712,771 | $9,760 | $16,539 |
| 2023 | $164,284 | $552,579 | $438,471 | $434,082 | 6 | $437,921 | $2,079 | $5,252 |
| 2022 | $50,176 | $202,823 | $403,727 | $393,761 | 11 | $395,429 | $111,143 | $5,873 |
| 2021 | $251,080 | $502,730 | $313,383 | $310,220 | 7 | $311,703 | $259,899 | — |
| 2020 | $61,733 | $400,694 | $367,195 | $365,182 | 9 | — | — | $58 |
| 2019 | $28,234 | $375,260 | $467,241 | $464,027 | 9 | — | — | $3,613 |
Under IRS private-foundation payout rules, Leiden Conservation Foundation reported a distributable amount of $18K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Leiden Conservation Foundation is led by Thomas M. Leiden, President since 2021 (on filings since 2019); none of the 2 officers listed in 2025 report compensation.
Officers on the 2025 filing
Thomas M. Leiden
President
Director & President → President, 2021
On filings since 2019
1 hr/week
No compensation reported
Kathleen A. Leiden
Secretary
Director, Secretary & Treasurer → Secretary & Treasurer, 2021
Secretary & Treasurer → Secretary, 2025
On filings since 2019
1 hr/week
No compensation reported
Data from IRS Form 990 filings, 2019–2025. "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 Leiden Conservation Foundation
How much does Leiden Conservation Foundation give each year?
Leiden Conservation Foundation gave $586K across 5 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $709K across 5 grants.
What is Leiden Conservation Foundation's typical grant size?
Leiden Conservation Foundation's median grant in 2025 was $20,048, and its average grant was $117,114, across 5 grants on its 2025 IRS Form 990-PF.
Where does Leiden Conservation Foundation give grants?
Leiden Conservation Foundation gives mostly in Wisconsin: 77% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest state was Ohio (23%). The most frequent recipient cities were South Africa, OH (2 grants).
Does Leiden Conservation Foundation give general operating support?
Not in 2025: none of the 5 grants with a stated purpose on Leiden Conservation Foundation's 2025 IRS Form 990-PF were described as general or operating support.
Who are Leiden Conservation Foundation's largest grantees?
Leiden Conservation Foundation's largest 2025 grantees include International Crane Foundation ($452,013), Endangered Wildlife Trust ($94,310) and Nelson Mandela University ($20,048), according to its 2025 IRS Form 990-PF. Together they received 97% of its itemized 2025 grant dollars.
How large is Leiden Conservation Foundation?
Leiden Conservation Foundation reported $332K in total assets on its 2025 IRS Form 990-PF. It paid out $601K in qualifying distributions that year, against a required minimum of $18K (roughly 5% of its investment assets).
What is Leiden Conservation Foundation's EIN?
Leiden Conservation Foundation's EIN (Employer Identification Number) is 45-2591325. IRS Form 990 filing data is available on this page for 2019–2025.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Data update history
(8)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2019 (received by the IRS March 18, 2020)
- Updated Form 990-PF for fiscal year 2020 (received by the IRS November 15, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS May 16, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS July 5, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS March 19, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS June 27, 2025)
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 7, 2026)
- IRS filings on file for fiscal years 2019–2024
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