Arboretum Foundation
THE ARBORETUM FOUNDATION PROMOTES, PROTECTS, AND ENHANCES THE WASHINGTON PARK ARBORETUM FOR CURRENT AND FUTURE GENERATIONS BY STRENGTHENING AND BUILDING A DIVERSE AND ENGAGED COMMUNITY OF DONORS, VOLUNTEERS, AND ADVOCATES.
Key facts about Arboretum Foundation
- EIN
- 91-0613583
- Latest 990 filing
- Form 990-PF, 2025
- Annual giving (2025)
- $1,004,070
- Grants made (2025)
- 2
- Average grant
- $502,035
- Median grant
- $502,035
- Total assets
- $14,446,067
- Primary geography
- Washington (100% of itemized 2025 grant dollars)
Data from IRS Form 990-PF, 2025; updated September 2026.
How Arboretum Foundation gives
- Giving fell 26% from 2022 to 2025. Method
From the foundation's IRS Form 990-PF filings. Methodology.
Next steps with Arboretum Foundation
- How to evaluate Arboretum Foundation as a funder
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Financial Overview
From 2025 IRS Form 990-PF · View filing
Total Assets
$14.4M
+23.5% YoY
Annual Giving
$1.0M
-35.8% YoY
Grant Count
2
+100.0% YoY
Avg Grant Size
$502K
-67.9% YoY
About Arboretum Foundation
Based on IRS filings
Arboretum Foundation is a nonprofit organization focused on Environment & Animals, based in Seattle, WA. IRS filing data is available from 2019 through 2025. As of 2025, the organization holds $14.4M in total assets. In 2025, it awarded 2 grants totaling $1.0M. Net investment income was $2.5M.
Focus Areas
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Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of all 2 itemized 2025 grant dollars.
States
Cities
Financial History
Multi-year comparison from IRS filings
| Metric | 2025 | 2024 | 2023 |
|---|---|---|---|
| Total Assets | $14,446,067 | $11,699,187 | $10,433,351 |
| Revenue | $7,864,410 | $4,043,563 | $4,785,446 |
| Expenses | $3,622,465 | $3,363,272 | $2,906,886 |
| Qualifying Distributions | — | — | — |
| Net Investment Income | $2,452,993 | $215,671 | $178,774 |
| Distributable Amount | — | — | — |
Data update history
When this profile's IRS filing data changed on Grantable
- IRS filings on file for fiscal years 2019–2025
Giving Over Time
Total grant dollars and number of grants per year
Grant Insights
How this funder distributes its grants
Top Recipients
Top 2 recipients in 2025
Grant Size Distribution
9 grants across all recorded years
Giving History
Grant recipients and amounts by year
Among its reported 2025 grants, the largest recipients include University of Washington ($965,552), City of Seattle - Seattle Parks and Recreation ($38,518).
| Recipient | Purpose | Amount |
|---|---|---|
| UNIVERSITY OF WASHINGTON Seattle, WA | CAPITAL PROJECTS, MAINTENANCE, EDUCATION, AND OTHER | $965,552 |
| CITY OF SEATTLE - SEATTLE PARKS AND RECREATION Seattle, WA | CAPITAL PROJECTS, MAINTENANCE, EDUCATION, AND OTHER | $38,518 |
Leadership & Key People
Officers and directors from IRS filings
Compensation Overview
From 2025 IRS filing
From 2025 IRS filing
| Name | Title | Hours | Compensation |
|---|---|---|---|
| Maribeth O'Connor | President | 10 | — |
| Jeff Lehman | Treasurer | 6 | — |
| Josh Dickson | Secretary | 6 | — |
| Peter Rees | Vice President | 4 | — |
| Mike Riley | Vice President | 4 | — |
| Alissa Rupp | Vice President | 4 | — |
| Scott Lindsay | Vice President | 4 | — |
| John Reed | Vice President | 2 | — |
| Thatcher Bailey | Board Member | 2 | — |
| Shaun Corry | Board Member | 2 | — |
| Joaquin Hernandez | Board Member | 2 | — |
| Larry Hubbell | Board Member | 2 | — |
| Barbara Jacobson | Board Member | 2 | — |
| Virginia Korycki | Board Member | 2 | — |
| Bill McGee | Board Member | 2 | — |
| Glenn Pinqul | Board Member | 2 | — |
| Lisa Vasser | Board Member | 2 | — |
| Missy Ward | Board Member | 2 | — |
| Kara Weaver | Board Member | 2 | — |
| Barbara Wright | Board Member | 2 | — |
| Jane Stonecipher | Executive Director Through December | 40 | $150,784 |
| Clare Hausmann | Advancement Director | 40 | $127,170 |
Subject Areas
Focus areas based on grantmaking activity
Frequently Asked Questions
What is Arboretum Foundation?
Arboretum Foundation is a nonprofit organization focused on Environment & Animals, based in Seattle, WA. It holds $14.4M in total assets as of 2025.
How large is Arboretum Foundation?
As of 2025, Arboretum Foundation holds $14.4M in total assets with $7.9M in annual revenue. It awarded 2 grants totaling $1.0M in 2025.
Where does Arboretum Foundation operate?
Arboretum Foundation has awarded grants in New Hampshire, Washington.
What size grants does Arboretum Foundation award?
In 2025, Arboretum Foundation awarded 2 grants totaling $1.0M — an average of about $502K per grant, based on its IRS Form 990 filings.
What is Arboretum Foundation's EIN?
Arboretum Foundation's EIN (Employer Identification Number) is 91-0613583. IRS Form 990 filing data is available on this page for 2019–2025.
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Data last updated September 2026. Sourced from IRS Form 990-PF filings.