Oosterhof Foundation Inc
Oosterhof Foundation Inc is a private foundation, based in Sammamish, WA. IRS filing data is available from 2023 through 2025. As of 2025, the organization holds $1.2M in total assets. In 2025, it awarded 6 grants totaling $32K. Net investment income was $28K.
Oosterhof Foundation Inc at a glance
In short: Oosterhof Foundation Inc gave $32K across 6 grants in 2025 (avg $5K), top state Washington. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $32,475
- Grants made (2025)
- 6
- Average grant
- $5,413
- Median grant
- $5,500
- Total assets
- $1,157,778
- -1.8% vs 2024
- Primary geography
- Washington (38% 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 Oosterhof Foundation Inc funds
How this funder distributes its grants
Top Recipients
Top 6 recipients in 2025
The largest 2025 recipient was Northwestern University ($10K). Together the top 6 received $32K.
Grant Size Distribution
6 grants across all recorded years
The most common grant size was under $50K: 6 grants of 6 (100%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 6 itemized grants.
States
Cities
How Oosterhof Foundation Inc gives
- In 2025 it paid out 57% of its IRS minimum distribution (the 5% rule). Foundations have until the end of the next year to meet it. 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
In 2025 it made 6 grants totaling $32K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Northwestern University Evanston, IL | General Purpose | $10,000 |
| Oklahoma State University Foundation Stillwater, OK | General Purpose | $10,000 |
| Seattle Children's Foundation Seattle, WA | General Purpose | $10,000 |
| Bloodworks Northwest Co Development Seattle, WA | General Purpose | $1,000 |
| Medic One Foundation Bellevue, WA | General Purpose | $1,000 |
| St Jude Catholic Church Redmond, WA | General Purpose | $475 |
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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 | $1,157,778 | $360,071 | $60,217 | $32,475 | 6 | $34,230 | $27,869 | $59,803 |
| 2024 | $1,178,629 | $1,098,290 | $14,796 | — | — | $6,933 | $1,090,427 | $40,188 |
| 2023 | $95,135 | $1,008,585 | — | — | — | — | — | $820 |
Under IRS private-foundation payout rules, Oosterhof Foundation Inc reported a distributable amount of $60K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Oosterhof Foundation Inc's 2025 filing lists 2 officers; none of the 2 officers listed in 2025 report compensation.
Officers on the 2025 filing
Ernst P. Oosterhof
Director
On filings since 2023
1 hr/week
No compensation reported
Kathy Oosterhof
Director
On filings since 2023
1 hr/week
No compensation reported
Data from IRS Form 990 filings, 2023–2025. "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 Oosterhof Foundation Inc
How much does Oosterhof Foundation Inc give each year?
Oosterhof Foundation Inc gave $32K across 6 grants in 2025, according to its 2025 IRS Form 990-PF.
What is Oosterhof Foundation Inc's typical grant size?
Oosterhof Foundation Inc's median grant in 2025 was $5,500, and its average grant was $5,413, across 6 grants on its 2025 IRS Form 990-PF.
Where does Oosterhof Foundation Inc give grants?
Oosterhof Foundation Inc's top state is Washington, with 38% of the grant dollars itemized on its 2025 IRS Form 990-PF. The next largest states were Illinois (31%) and Oklahoma (31%). The most frequent recipient cities were Seattle, WA (2 grants).
Does Oosterhof Foundation Inc give general operating support?
Yes: 100% of Oosterhof Foundation Inc's 2025 grants with a stated purpose (6 of 6) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are Oosterhof Foundation Inc's largest grantees?
Oosterhof Foundation Inc's largest 2025 grantees include Northwestern University ($10,000), Oklahoma State University Foundation ($10,000) and Seattle Children's Foundation ($10,000), according to its 2025 IRS Form 990-PF. Together they received 92% of its itemized 2025 grant dollars.
How large is Oosterhof Foundation Inc?
Oosterhof Foundation Inc reported $1.2M in total assets on its 2025 IRS Form 990-PF. It paid out $34K in qualifying distributions that year, against a required minimum of $60K (roughly 5% of its investment assets). Falling short in one year is not a violation: foundations have until the end of the next year to meet the minimum.
What is Oosterhof Foundation Inc's EIN?
Oosterhof Foundation Inc's EIN (Employer Identification Number) is 93-4298183. IRS Form 990 filing data is available on this page for 2023–2025.
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 May 8, 2026)
- IRS filings on file for fiscal years 2023–2024
Live grants for the work Oosterhof Foundation Inc funds
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