Marie & Mayer Winkler Peter C & Helen D
Marie & Mayer Winkler Peter C & Helen D is a private foundation, based in Clayton, MO. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $4.4M in total assets. In 2025, it awarded 3 grants totaling $290K. Net investment income was $318K.
Marie & Mayer Winkler Peter C & Helen D at a glance
In short: Marie & Mayer Winkler Peter C & Helen D gave $290K across 3 grants in 2025 (avg $97K), mostly in Missouri. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $290,001
- +11.5% vs 2024
- Grants made (2025)
- 3
- +0.0% vs 2024
- Average grant
- $96,667
- +11.5% vs 2024
- Median grant
- $96,667
- Total assets
- $4,400,742
- +0.4% vs 2024
- Primary geography
- Missouri (67% 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 Marie & Mayer Winkler Peter C & Helen D funds
How this funder distributes its grants
Top Recipients
Top 3 recipients in 2025
The largest 2025 recipient was Shriners Hospital for Children ($97K). Together the top 3 received $290K.
Grant Size Distribution
15 grants across all recorded years
The most common grant size was in the $50–100K range: 15 grants of 15 (100%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 3 itemized grants.
Cities
How Marie & Mayer Winkler Peter C & Helen D gives
- Giving held roughly steady from 2022 to 2025 (+16%). Method
- In 2025 it paid out 111% 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 2025, annual grant giving ranged from $250K (2021) to $290K (2025). In 2025 it made 3 grants totaling $290K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Shriners Hospital for Children Tampa, FL | General Operations | $96,667 |
| St Louis University St. Louis, MO | General Operations | $96,667 |
| School of the Ozarks Point Lookout, MO | General Operations | $96,667 |
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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 | $4,400,742 | $368,035 | $351,947 | $290,001 | 3 | $302,100 | $318,189 | $271,252 |
| 2024 | $4,384,647 | $200,639 | $322,573 | $260,001 | 3 | $271,306 | $154,074 | $256,541 |
| 2023 | $4,506,605 | $466,856 | $340,423 | $275,001 | 3 | $285,873 | $420,869 | $241,602 |
| 2022 | $4,380,172 | $551,432 | $320,721 | $250,002 | 3 | $263,040 | $500,912 | $278,827 |
| 2021 | $4,149,889 | $433,555 | $314,754 | $250,002 | 3 | — | $385,668 | $264,054 |
| 2020 | $4,031,051 | $220,501 | $317,130 | $260,001 | 3 | — | $175,668 | $234,161 |
Under IRS private-foundation payout rules, Marie & Mayer Winkler Peter C & Helen D reported a distributable amount of $271K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Marie & Mayer Winkler Peter C & Helen D is led by Leonard L. Denk, Co-Trustee on every filing since 2020 — the only officer listed, and compensated.
Officers on the 2025 filing
Leonard L. Denk
Co-Trustee
On filings since 2020
2 hrs/week
$10K (2020) → $11K (2025)
Data from IRS Form 990 filings, 2020–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Compensation Overview
From 2025 IRS filing
The highest reported compensation on the 2025 filing was $11K, to Leonard L Denk (Co-Trustee).
Frequently asked questions about Marie & Mayer Winkler Peter C & Helen D
How much does Marie & Mayer Winkler Peter C & Helen D give each year?
Marie & Mayer Winkler Peter C & Helen D gave $290K across 3 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $260K across 3 grants.
What is Marie & Mayer Winkler Peter C & Helen D's typical grant size?
Marie & Mayer Winkler Peter C & Helen D's median grant in 2025 was $96,667, and its average grant was $96,667, across 3 grants on its 2025 IRS Form 990-PF.
Where does Marie & Mayer Winkler Peter C & Helen D give grants?
Marie & Mayer Winkler Peter C & Helen D gives mostly in Missouri: 67% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest state was Florida (33%).
Does Marie & Mayer Winkler Peter C & Helen D give general operating support?
Yes: 100% of Marie & Mayer Winkler Peter C & Helen D's 2025 grants with a stated purpose (3 of 3) were for general or operating support, per its 2025 IRS Form 990-PF.
How large is Marie & Mayer Winkler Peter C & Helen D?
Marie & Mayer Winkler Peter C & Helen D reported $4.4M in total assets on its 2025 IRS Form 990-PF. It paid out $302K in qualifying distributions that year, against a required minimum of $271K (roughly 5% of its investment assets).
What is Marie & Mayer Winkler Peter C & Helen D's EIN?
Marie & Mayer Winkler Peter C & Helen D's EIN (Employer Identification Number) is 37-6528633. IRS Form 990 filing data is available on this page for 2020–2025.
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 2020–2025
Live grants for the work Marie & Mayer Winkler Peter C & Helen D funds
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