The Millbrook Foundation
The Millbrook Foundation is a private foundation focused on Human Services, based in Gladwyne, PA. IRS filing data is available from 2018 through 2025. As of 2025, the organization holds $58K in total assets. In 2025, it awarded 2 grants totaling $15K. Net investment income was $4K.
The Millbrook Foundation at a glance
In short: The Millbrook Foundation gave $15K across 2 grants in 2025 (avg $8K), mostly in New York. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $15,000
- +50.0% vs 2024
- Grants made (2025)
- 2
- +0.0% vs 2024
- Average grant
- $7,500
- +50.0% vs 2024
- Median grant
- $7,500
- Total assets
- $58,282
- -15.4% vs 2024
- Primary geography
- New York (67% 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 The Millbrook Foundation funds
How this funder distributes its grants
Top Recipients
Top 2 recipients in 2025
The largest 2025 recipient was International AIDS Vaccine Initiative Inc ($10K). Together the top 2 received $15K.
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 2 itemized grants.
Cities
How The Millbrook Foundation gives
- Giving grew 200% from 2022 to 2025. Method
- In 2025 it paid out 444% 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 2018 to 2025, annual grant giving ranged from $5K (2018) to $15K (2025). In 2025 it made 2 grants totaling $15K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| International AIDS Vaccine Initiative Inc New York, NY | Unrestricted | $10,000 |
| Philabundance Philadelphia, PA | Unrestricted | $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 | $58,282 | $4,642 | $15,231 | $15,000 | 2 | $15,000 | $4,411 | $3,380 |
| 2024 | $68,871 | $3,389 | $10,255 | $10,000 | 2 | $10,000 | $3,071 | $3,775 |
| 2023 | $75,737 | $677 | $218 | — | — | — | $2,010 | $3,564 |
| 2022 | $75,278 | $3,930 | $5,312 | $5,000 | 1 | $5,000 | $3,718 | $3,716 |
| 2021 | $76,660 | $3,741 | $5,299 | $5,000 | 1 | $5,000 | $3,487 | $4,339 |
| 2020 | $78,218 | $213 | $5,237 | $5,000 | 1 | — | $3,064 | $4,066 |
| 2019 | $83,242 | $3,465 | $5,266 | $5,000 | 1 | — | $3,199 | $4,202 |
| 2018 | $85,043 | $1,245 | $6,223 | $5,000 | 1 | — | $22 | $4,414 |
Under IRS private-foundation payout rules, The Millbrook Foundation reported a distributable amount of $3K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
The Millbrook Foundation is led by Laura Tseng, President, Treasurer & Secretary on every filing since 2018; none of the 2 officers listed in 2025 report compensation.
Officers on the 2025 filing
Laura Tseng
President, Treasurer & Secretary
On filings since 2018
No compensation reported
Trey Katzenbach
Vice President
On filings since 2018
No compensation reported
Data from IRS Form 990 filings, 2018–2025. "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 The Millbrook Foundation
How much does The Millbrook Foundation give each year?
The Millbrook Foundation gave $15K across 2 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $10K across 2 grants.
How large is The Millbrook Foundation?
The Millbrook Foundation reported $58K in total assets on its 2025 IRS Form 990-PF. It paid out $15K in qualifying distributions that year, against a required minimum of $3K (roughly 5% of its investment assets).
What is The Millbrook Foundation?
The Millbrook Foundation is a private foundation focused on Human Services, based in Gladwyne, PA. It holds $58K in total assets as of 2025.
Where does The Millbrook Foundation operate?
The Millbrook Foundation has awarded grants in California, Colorado, Massachusetts, New Hampshire, New York, Pennsylvania.
What is The Millbrook Foundation's EIN?
The Millbrook Foundation's EIN (Employer Identification Number) is 61-1633896. IRS Form 990 filing data is available on this page for 2018–2025.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Data update history
(4)
When this profile's IRS filing data changed on Grantable
- Added Form 990-PF for fiscal year 2018 (received by the IRS November 7, 2019)
- Added Form 990-PF for fiscal year 2019 (received by the IRS August 24, 2020)
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 15, 2026)
- IRS filings on file for fiscal years 2020–2024
Live grants for the work The Millbrook Foundation funds
Human Services Open opportunities, soonest deadline first.
Explore Open Grants
Browse active grant opportunities in The Millbrook Foundation's focus areas in our free grants database
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