Assenmacher Foundation
Assenmacher Foundation is a private foundation, based in Tucson, AZ. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $320K in total assets. In 2025, it awarded 7 grants totaling $70K. Net investment income was $37K.
Assenmacher Foundation at a glance
In short: Assenmacher Foundation gave $70K across 7 grants in 2025 (avg $10K), mostly in Arizona. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $69,500
- -39.5% vs 2024
- Grants made (2025)
- 7
- +16.7% vs 2024
- Average grant
- $9,929
- -48.1% vs 2024
- Median grant
- $7,500
- Total assets
- $319,529
- +7.2% vs 2024
- Primary geography
- Arizona (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.
Who Assenmacher Foundation funds
How this funder distributes its grants
Top Recipients
Top 6 recipients in 2025
The largest 2025 recipient was El Rio Foundation ($25K). Together the top 6 received $70K.
Grant Size Distribution
37 grants across all recorded years
The most common grant size was under $50K: 36 grants of 37 (97%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 7 itemized grants.
Cities
How Assenmacher Foundation gives
- Giving held roughly steady from 2022 to 2025 (−2%). Method
- In 2025 it paid out 342% 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 $64K (2023) to $120K (2020). In 2025 it made 7 grants totaling $70K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| El Rio Foundation Tucson, AZ | Program Support | $25,000 |
| Centurion Foundation Tucson, AZ | Program Support | $20,000 |
| University of Arizona Foundation Tucson, AZ | Student-Athlete Excellence Fund | $10,000 |
| Children's Advocacy Center of Southern Arizona Tucson, AZ | Program Support | $7,500 |
| Southern Arizona Adaptive Sports Tucson, AZ | Program Support | $5,000 |
| University of Arizona Foundation Tucson, AZ | Father's Day Council Tucson | $1,000 |
| University of Arizona Tucson, AZ | PCCE Master Garden Program | $1,000 |
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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 | $319,529 | $92,425 | $70,986 | $69,500 | 7 | $70,150 | $36,589 | $20,498 |
| 2024 | $298,129 | $63,437 | $116,331 | $114,800 | 6 | $115,400 | $7,796 | $20,030 |
| 2023 | $351,023 | $64,651 | $65,269 | $64,000 | 8 | $64,550 | $8,932 | $17,756 |
| 2022 | $351,641 | $88,275 | $72,882 | $71,000 | 7 | $71,525 | $8,797 | $17,383 |
| 2021 | $336,248 | $148,696 | $115,414 | $113,000 | 9 | $113,475 | $48,221 | $19,524 |
| 2020 | $302,966 | $148,151 | $123,660 | $119,500 | 4 | — | $47,761 | $16,549 |
Under IRS private-foundation payout rules, Assenmacher Foundation reported a distributable amount of $20K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Assenmacher Foundation is led by William Assenmacher, President on every filing since 2020 — the only officer listed, and uncompensated.
Officers on the 2025 filing
William Assenmacher
President
On filings since 2020
1 hr/week
No compensation reported
Former officers (1)
- Former: Molly Assenmacher (2020–2023) — Trustee
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.
Frequently asked questions about Assenmacher Foundation
How much does Assenmacher Foundation give each year?
Assenmacher Foundation gave $70K across 7 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $115K across 6 grants.
What is Assenmacher Foundation's typical grant size?
Assenmacher Foundation's median grant in 2025 was $7,500, and its average grant was $9,929, across 7 grants on its 2025 IRS Form 990-PF.
Where does Assenmacher Foundation give grants?
Assenmacher Foundation gives mostly in Arizona: 100% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The most frequent recipient cities were Tucson, AZ (7 grants).
Does Assenmacher Foundation give general operating support?
Not in 2025: none of the 7 grants with a stated purpose on Assenmacher Foundation's 2025 IRS Form 990-PF were described as general or operating support. Recurring purposes include "Program Support" (4 grants).
Who are Assenmacher Foundation's largest grantees?
Assenmacher Foundation's largest 2025 grantees include El Rio Foundation ($25,000), Centurion Foundation ($20,000) and University of Arizona Foundation ($11,000 across 2 grants), according to its 2025 IRS Form 990-PF. Together they received 81% of its itemized 2025 grant dollars.
How large is Assenmacher Foundation?
Assenmacher Foundation reported $320K in total assets on its 2025 IRS Form 990-PF. It paid out $70K in qualifying distributions that year, against a required minimum of $20K (roughly 5% of its investment assets).
What is Assenmacher Foundation's EIN?
Assenmacher Foundation's EIN (Employer Identification Number) is 83-2788578. 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
(7)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2020 (received by the IRS April 23, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS March 4, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS May 16, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS April 29, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS June 2, 2025)
- Updated Form 990-PF for fiscal year 2025 (received by the IRS March 30, 2026)
- IRS filings on file for fiscal years 2020–2025
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