Olsen and Tang Family Foundation
Olsen and Tang Family Foundation is a private foundation, based in Scottsdale, AZ. IRS filing data is available from 2021 through 2025. As of 2025, the organization holds $373K in total assets. In 2025, it awarded 4 grants totaling $35K. Net investment income was $85K.
Olsen and Tang Family Foundation at a glance
In short: Olsen and Tang Family Foundation gave $35K across 4 grants in 2025 (avg $9K), mostly in Arizona. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $35,000
- -30.0% vs 2024
- Grants made (2025)
- 4
- +33.3% vs 2024
- Average grant
- $8,750
- -47.5% vs 2024
- Median grant
- $5,000
- Total assets
- $373,008
- +12.7% vs 2024
- Primary geography
- Arizona (86% 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 Olsen and Tang Family Foundation funds
How this funder distributes its grants
Top Recipients
Top 4 recipients in 2025
The largest 2025 recipient was Mayo Clinic ($20K). Together the top 4 received $35K.
Grant Size Distribution
11 grants across all recorded years
The most common grant size was under $50K: 10 grants of 11 (91%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 4 itemized grants.
Cities
How Olsen and Tang Family Foundation gives
- Giving grew 75% from 2022 to 2025. Method
- In 2025 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 2021 to 2025, annual grant giving ranged from $20K (2022) to $491K (2021). In 2025 it made 4 grants totaling $35K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Mayo Clinic Scottsdale, AZ | Charitable/Health | $20,000 |
| United Food Bank Mesa, AZ | Charitable/Health | $5,000 |
| Arizona PBS Phoenix, AZ | Educational | $5,000 |
| NPR Washington DC, DC | Education | $5,000 |
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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 | $373,008 | $84,757 | $42,594 | $35,000 | 4 | $35,000 | $84,757 | $25,308 |
| 2024 | $330,845 | $184,063 | $55,602 | $50,000 | 3 | $50,000 | $179,978 | $22,894 |
| 2023 | $202,384 | $104,221 | $27,089 | $25,000 | 2 | $25,000 | $104,221 | $20,653 |
| 2022 | $125,252 | $161,896 | $36,644 | $20,000 | 1 | $20,000 | $9,726 | $22,109 |
| 2021 | $74,627 | $1,542,664 | $495,159 | $491,182 | 1 | $491,182 | $1,047,505 | — |
Under IRS private-foundation payout rules, Olsen and Tang Family Foundation reported a distributable amount of $25K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Olsen and Tang Family Foundation's 2025 filing lists 2 officers; none of the 2 officers listed in 2025 report compensation.
Officers on the 2025 filing
Wanda Tang
Director
On filings since 2021
No compensation reported
William R. Olsen
Director
On filings since 2021
No compensation reported
Data from IRS Form 990 filings, 2021–2025. "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 Olsen and Tang Family Foundation
How much does Olsen and Tang Family Foundation give each year?
Olsen and Tang Family Foundation gave $35K across 4 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $50K across 3 grants.
What is Olsen and Tang Family Foundation's typical grant size?
Olsen and Tang Family Foundation's median grant in 2025 was $5,000, and its average grant was $8,750, across 4 grants on its 2025 IRS Form 990-PF.
Where does Olsen and Tang Family Foundation give grants?
Olsen and Tang Family Foundation gives mostly in Arizona: 86% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest state was District of Columbia (14%).
Does Olsen and Tang Family Foundation give general operating support?
Not in 2025: none of the 4 grants with a stated purpose on Olsen and Tang Family Foundation's 2025 IRS Form 990-PF were described as general or operating support.
How large is Olsen and Tang Family Foundation?
Olsen and Tang Family Foundation reported $373K in total assets on its 2025 IRS Form 990-PF. It paid out $35K in qualifying distributions that year, against a required minimum of $25K (roughly 5% of its investment assets).
What is Olsen and Tang Family Foundation's EIN?
Olsen and Tang Family Foundation's EIN (Employer Identification Number) is 87-1181099. IRS Form 990 filing data is available on this page for 2021–2025.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Data update history
(2)
When this profile's IRS filing data changed on Grantable
- Added Form 990-PF for fiscal year 2025 (received by the IRS April 29, 2026)
- IRS filings on file for fiscal years 2021–2024
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