Costolo Family Foundation
Costolo Family Foundation is a private foundation, based in Wilmington, DE. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $10.7M in total assets. In 2025, it awarded 7 grants totaling $625K. Net investment income was $1.1M.
Costolo Family Foundation at a glance
In short: Costolo Family Foundation gave $625K across 7 grants in 2025 (avg $89K), top state Wyoming. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $625,000
- +48.8% vs 2024
- Grants made (2025)
- 7
- +0.0% vs 2024
- Average grant
- $89,286
- +48.8% vs 2024
- Median grant
- $100,000
- Total assets
- $10,687,642
- +4.0% vs 2024
- Primary geography
- Wyoming (28% 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 Costolo Family Foundation funds
How this funder distributes its grants
Top Recipients
Top 7 recipients in 2025
The largest 2025 recipient was Grand Teton National Park Foundation ($150K). Together the top 7 received $625K.
Grant Size Distribution
22 grants across all recorded years
The most common grant size was in the $100–250K range: 12 grants of 22 (55%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 7 itemized grants.
Cities
How Costolo Family Foundation gives
- Giving grew 150% from 2022 to 2025. Method
- In 2025 it paid out 114% 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 2022 to 2025, annual grant giving ranged from $250K (2022) to $625K (2025). In 2025 it made 7 grants totaling $625K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Grand Teton National Park Foundation Moose, WY | General & Unrestricted | $150,000 |
| Conservation International Foundation Boston, MA | General & Unrestricted | $100,000 |
| Elephant Havens Wildlife Foundation Inc Dallas, TX | General & Unrestricted | $100,000 |
| Pacific Wild Alliance Issaquah, WA | General & Unrestricted | $100,000 |
| The Nature Conservancy Cold Spring Harbor, NY | General & Unrestricted | $100,000 |
| Sarara Institute Denver, CO | General & Unrestricted | $50,000 |
| Teton County Search & Rescue Foundation Jackson, WY | General & Unrestricted | $25,000 |
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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 | $10,687,642 | $1,122,478 | $713,973 | $625,000 | 7 | $661,034 | $1,075,922 | $578,838 |
| 2024 | $10,279,137 | $778,127 | $505,411 | $420,000 | 7 | $454,026 | $356,440 | $558,896 |
| 2023 | $9,996,421 | $1,614,343 | $357,872 | $270,000 | 5 | $299,832 | $226,988 | $447,761 |
| 2022 | $8,739,950 | $-2,727 | $329,177 | $250,000 | 3 | $279,624 | $156,444 | $404,806 |
| 2021 | $9,071,854 | $9,205,050 | $133,196 | — | — | $17,814 | $7,910,402 | $173,430 |
Under IRS private-foundation payout rules, Costolo Family Foundation reported a distributable amount of $579K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Costolo Family Foundation is led by Lorin Costolo, Director & President on every filing since 2020; none of the 3 officers listed in 2025 report compensation.
Officers on the 2025 filing
Lorin Costolo
Director & President
On filings since 2020
1 hr/week
No compensation reported
Richard Costolo
Director, Secretary & Treasurer
On filings since 2020
1 hr/week
No compensation reported
Rose Costolo
Director
On filings since 2020
1 hr/week
No compensation reported
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 Costolo Family Foundation
How much does Costolo Family Foundation give each year?
Costolo Family Foundation gave $625K across 7 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $420K across 7 grants.
What is Costolo Family Foundation's typical grant size?
Costolo Family Foundation's median grant in 2025 was $100,000, and its average grant was $89,286, across 7 grants on its 2025 IRS Form 990-PF.
Where does Costolo Family Foundation give grants?
Costolo Family Foundation's top state is Wyoming, with 28% of the grant dollars itemized on its 2025 IRS Form 990-PF. The next largest states were Massachusetts (16%) and Texas (16%).
Does Costolo Family Foundation give general operating support?
Yes: 100% of Costolo Family Foundation's 2025 grants with a stated purpose (7 of 7) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are Costolo Family Foundation's largest grantees?
Costolo Family Foundation's largest 2025 grantees include Grand Teton National Park Foundation ($150,000), Conservation International Foundation ($100,000) and Elephant Havens Wildlife Foundation Inc ($100,000), according to its 2025 IRS Form 990-PF. Together they received 56% of its itemized 2025 grant dollars.
How large is Costolo Family Foundation?
Costolo Family Foundation reported $10.7M in total assets on its 2025 IRS Form 990-PF. It paid out $661K in qualifying distributions that year, against a required minimum of $579K (roughly 5% of its investment assets).
What is Costolo Family Foundation's EIN?
Costolo Family Foundation's EIN (Employer Identification Number) is 86-1199543. 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
(2)
When this profile's IRS filing data changed on Grantable
- Added Form 990-PF for fiscal year 2025 (received by the IRS July 24, 2026)
- IRS filings on file for fiscal years 2020–2024
Live grants for the work Costolo Family Foundation funds
Philanthropy, Voluntarism & Grantmaking Open opportunities, soonest deadline first.
Explore Open Grants
Browse active grant opportunities in Costolo Family Foundation's focus areas in our free grants database
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