Sonnentag Foundation Ltd
Sonnentag Foundation Ltd is a private foundation, based in Marathon, WI. IRS filing data is available from 2019 through 2025. As of 2025, the organization holds $43.4M in total assets. In 2025, it awarded 1 grant totaling $6.4M. Net investment income was $2.6M.
Sonnentag Foundation Ltd at a glance
In short: Sonnentag Foundation Ltd gave $6.4M across 1 grant in 2025 (avg $6.4M), mostly in Wisconsin. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $6,371,389
- -32.4% vs 2024
- Grants made (2025)
- 1
- +0.0% vs 2024
- Average grant
- $6,371,389
- -32.4% vs 2024
- Median grant
- $6,371,389
- Total assets
- $43,384,208
- -4.1% vs 2024
- Primary geography
- Wisconsin (100% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated September 2026.
How to apply to Sonnentag Foundation Ltd
Open Grants
1 open opportunity from Sonnentag Foundation Ltd
Who Sonnentag Foundation Ltd funds
How this funder distributes its grants
Top Recipients
Top recipient in 2025
The largest 2025 recipient was All-See Attached ($6.4M).
Grant Size Distribution
5 grants across all recorded years
The most common grant size was $5M or more: 3 grants of 5 (60%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of the 2025 grant dollars on its one itemized grant.
States
Cities
How Sonnentag Foundation Ltd gives
- Giving held roughly steady from 2022 to 2025 (−11%). Method
- In 2024 it paid out 456% 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 2019 to 2025, annual grant giving ranged from $654K (2021) to $9.4M (2024). In 2025 it made 1 grant totaling $6.4M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| All-See Attached Marathon, WI | Charitable Donations | $6,371,389 |
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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 | $43,384,208 | $4,598,605 | $6,470,668 | $6,371,389 | 1 | $6,371,389 | $2,571,605 | — |
| 2024 | $45,256,271 | $16,784,819 | $9,553,487 | $9,431,634 | 1 | $9,431,634 | $5,964,819 | $2,067,869 |
| 2023 | $38,024,939 | $6,477,125 | $1,199,060 | $1,178,234 | 1 | $1,178,234 | $6,450,861 | $1,613,747 |
| 2022 | $32,746,874 | $-29,257,914 | $7,359,653 | $7,148,102 | 1 | $7,148,102 | $466,083 | $2,445,663 |
| 2021 | $69,364,441 | $13,297,469 | $800,693 | $653,714 | 1 | $653,714 | $10,804,828 | $3,178,956 |
| 2020 | $56,867,665 | $25,446,722 | $933,479 | $854,039 | 1 | — | $8,055,990 | $2,321,802 |
| 2019 | $32,354,422 | $7,316,130 | $3,032,775 | $2,922,435 | 1 | — | $2,659,158 | $1,507,132 |
Leadership & Key People
Officers and directors from IRS filings
Sonnentag Foundation Ltd is led by John Sonnentag, President on every filing since 2019; none of the 3 officers listed in 2025 report compensation.
Officers on the 2025 filing
John Sonnentag
President
On filings since 2019
No compensation reported
Bill Sonnentag
Director Part Time
On filings since 2019
No compensation reported
Carolyn Sonnentag
Vice President Part Time
On filings since 2019
No compensation reported
Former officers (1)
- Former: Tim Sonnentag (2019–2022) — Director Part Time
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 Sonnentag Foundation Ltd
How much does Sonnentag Foundation Ltd give each year?
Sonnentag Foundation Ltd gave $6.4M across 1 grant in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $9.4M across 1 grant.
How large is Sonnentag Foundation Ltd?
Sonnentag Foundation Ltd reported $43.4M in total assets on its 2025 IRS Form 990-PF. Its revenue that year was $4.6M.
Where does Sonnentag Foundation Ltd operate?
Sonnentag Foundation Ltd has awarded grants in Wisconsin.
What is Sonnentag Foundation Ltd's EIN?
Sonnentag Foundation Ltd's EIN (Employer Identification Number) is 39-1597420. 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 May 21, 2020)
- Updated Form 990-PF for fiscal year 2020 (received by the IRS May 14, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS November 15, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS November 8, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS September 24, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS May 9, 2025)
- Updated Form 990-PF for fiscal year 2025 (received by the IRS March 16, 2026)
- IRS filings on file for fiscal years 2019–2025
Explore Open Grants
Browse active grant opportunities in Sonnentag Foundation Ltd's focus areas in our free grants database
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