Marinus and Minna B Koster Foundation
The Marinus and Minna B Koster Foundation is a private foundation based in Potomac Falls, Virginia. It supports scholarships and financial assistance for musically talented young people, preservation of Yiddish culture, and services for immigrants to the United States, especially Jewish immigrants.
Key facts about Marinus and Minna B Koster Foundation
In short: Marinus and Minna B Koster Foundation gave $225K across 18 grants in 2025 (avg $13K), top state District of Columbia. 12% of 2025 grantees were new. Source: 2025 IRS Form 990-PF.
- EIN
- 27-1533411
- Latest 990 filing
- Form 990-PF, 2025
- Annual giving (2025)
- $225,000
- Grants made (2025)
- 18
- Average grant
- $12,500
- Median grant
- $10,000
- New grantees (estimate)
- 12% first-time grantees (2 of 17, 2025)
- Total assets
- $7,538,830
- Primary geography
- District of Columbia (41% of itemized 2025 grant dollars)
- How to apply
- The 2024 filing says application instructions are available on the foundation’s website. Full details ↓
- Deadline
- The filing states that applications must be received by March 15 for each fiscal year ending June 30.
Data from IRS Form 990-PF, 2025; updated September 2026. New grantees are estimated by matching recipient names across years (methodology). Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Financial Overview
From 2025 IRS Form 990-PF · View filing
Total Assets
$7.5M
+7.8% YoY
Annual Giving
$225K
+9.8% YoY
Grant Count
18
-5.3% YoY
Avg Grant Size
$13K
+15.9% YoY
Under IRS private-foundation payout rules, Marinus and Minna B Koster Foundation reported a distributable amount of $356K for 2025 — the minimum it must pay out in qualifying distributions.
Is Marinus and Minna B Koster Foundation open to new grantees?
12%
first-time grantees, 2025
In 2025, 2 of 17 grantees (12%) were first-time recipients. First grants averaged $20K; repeat grants $12K. How we count
Medians: $20K first-time, $10K repeat.
- 71% of 2025 grantees were also funded in 2024. Method
- Giving held roughly steady from 2022 to 2025 (−10%). Method
- In 2025 it paid out 93% of its IRS minimum distribution (the 5% rule). Foundations have until the end of the next year to meet it. Method
Estimate from itemized grant lists in IRS Form 990-PF filings (2018–2025). Recipient names are matched across years, so a renamed or misspelled grantee can look new; grants to individuals are left out. Methodology.
Mission & Focus Areas
The foundation’s mission is to provide scholarships and financial assistance to musically talented children and young adults; promote the preservation of Yiddish culture, including its language, theater, and scholarship; and assist immigrants—especially Jewish immigrants—with housing, language, job training, and other services.
Its 2025 grants included support for youth orchestras, music education and scholarships, Yiddish theater and cultural programming, and immigrant employment and legal services. For example, DC Youth Orchestra Program describes its mission as empowering young people through music and community, while Pennsylvania Women Work says it helps women advance in their careers and achieve self-sufficiency through career development and mentorship. The Center for Traditional Music and Dance describes its work as partnering with New York City immigrant communities to sustain performing arts traditions.
The grant program is limited to organizations exempt under Section 501(c)(3) of the Internal Revenue Code. The program states that grants are not made to individuals.
Grantmaking
In filing year 2025, the foundation awarded 18 grants totaling $225,000. Grant amounts ranged from $5,000 to $30,000, with a median of $10,000. The grant program lists an award range of $5,000–$50,000.
Review Cycle
The filing states that applications must be received by March 15 for each fiscal year ending June 30. The March 15, 2026 deadline is past; the grant program says applications received after March 15 will be considered in the subsequent fiscal year.
Open Grants
1 open opportunity from Marinus and Minna B Koster Foundation
Ready to take the next step with Marinus and Minna B Koster Foundation?
Geographic Focus
Where this funder awards grants
The foundation is based in Potomac Falls, Virginia. In 2025, its grant dollars went to recipients in Washington, DC (41%), New York (26%), Maryland (16%), Virginia (9%), and Pennsylvania (8%).
Grant Distribution by State
Share of 2025 grant dollars across all 18 itemized grants.
Cities
Giving Over Time
Total grant dollars and number of grants per year
From 2018 to 2025, annual grant giving ranged from $180K (2018) to $250K (2022). In 2025 it made 18 grants totaling $225K.
Grant Insights
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2025
The largest 2025 recipient was Edlavitch Jewish Community Center of DC ($30K). Together the top 10 received $166K.
Grant Size Distribution
95 grants across all recorded years
The most common grant size was under $50K: 95 grants of 95 (100%).
Giving History
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Edlavitch Jewish Community Center of DC Washington, DC | Theater J'S Yiddish Theater Lab | $30,000 |
| DC Youth Orchestra Program Washington, DC | 2025-2026 Talent Development Program | $20,000 |
| Pennsylvania Women Work Pittsburgh, PA | Refugee & Immigrant Services for Employment | $18,000 |
| Sitar Arts Center Washington, DC | 2025-2026 Instrumental Music Academy | $18,000 |
| University of Maryland College Park Foundation College Park, MD | National Orchestral Institute +Festival Scholarships | $15,000 |
| Center for Traditional Music and Dance New York, NY | Yiddish New York | $13,000 |
| American Youth Philharmonic Orchestras Annandale, VA | 2025-2026 Tuition Assistance Program | $12,000 |
| American University Washington, DC | Summer Study Grants for Music Majors- Koster Fdn | $10,000 |
| Avodah the Jewish Service Corps New York, NY | Enhancing the Capacity of Immigration Nonprofits | $10,000 |
| End Sijs Backlog Coalition Washington, DC | National immigration project-national lawyers guild - immigrant youth program | $10,000 |
Financial History
Multi-year comparison from IRS filings
| Filing year | Assets | Revenue | Expenses | Grants |
|---|---|---|---|---|
| 2025 | $7,538,830 | $455,138 | $373,262 | $225,000 |
| 2024 | $6,992,775 | $463,944 | $329,891 | $205,000 |
| 2023 | $6,319,551 | $212,480 | $325,598 | $185,000 |
| Metric | 2025 | 2024 | 2023 |
|---|---|---|---|
| Total Assets | $7,538,830 | $6,992,775 | $6,319,551 |
| Revenue | $455,138 | $463,944 | $212,480 |
| Expenses | $373,262 | $329,891 | $325,598 |
| Qualifying Distributions | $332,803 | $301,791 | $293,050 |
| Net Investment Income | $415,014 | $435,844 | $179,932 |
| Distributable Amount | $356,333 | $320,432 | $293,884 |
Data update history
When this profile's IRS filing data changed on Grantable
- Added Form 990-PF for fiscal year 2018 (received by the IRS April 6, 2020)
- Added Form 990-PF for fiscal year 2019 (received by the IRS April 6, 2020)
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 12, 2026)
- IRS filings on file for fiscal years 2020–2024
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists Rosette M. Wills as president, Barbara Freedman as secretary, and Michael T. Flynn as treasurer. Sterling E. Scroggins and Miriam Isaacs are listed as advisors.
Marinus and Minna B Koster Foundation is led by Rosette M. Wills, President since 2019 (on filings since 2018); all 5 officers listed in 2025 are compensated.
Officers on the 2025 filing
Rosette M. Wills
President
Secretary → President, 2019
On filings since 2018
2 hrs/week
$10K (2018) → $18K (2025)
Barbara Freedman
Secretary
Treasurer → Secretary, 2019
On filings since 2018
2 hrs/week
$15K (2019) → $18K (2025)
Miriam Isaacs
Advisor
On filings since 2018
1 hr/week
$2K (2018) → $4K (2025)
Sterling E. Scroggins
Advisor
On filings since 2018
1 hr/week
$2K (2018) → $4K (2025)
Michael T. Flynn
Treasurer
On filings since 2023
2 hrs/week
$18K (2023) → $18K (2025)
Former officers (3)
- Former: Susan Gilbert (2018–2023) — Former Treasurer
- Former: David C. Metzler (2018–2019) — Former President
- Former: Alan I. Siegel (2019) — Former Treasurer
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.
Compensation Overview
From 2025 IRS filing
The highest reported compensation on the 2025 filing was $18K, to Rosette M Wills (President). 5 officers or directors reported compensation on that filing.
Contact
Application contact: Pnc Private Foundation Management S
Mailing address: Tower At Pnc Plaza 300 Fifth Ave, Pittsburgh, PA 15222
Phone: (412) 762-2083
Email: robert.trinkle@pnc.com
Website: https://themarinusandminnabkosterfoundation.org
Frequently asked questions about Marinus and Minna B Koster Foundation
How much does Marinus and Minna B Koster Foundation give each year?
Marinus and Minna B Koster Foundation gave $225K across 18 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $205K across 19 grants.
What is Marinus and Minna B Koster Foundation's typical grant size?
Marinus and Minna B Koster Foundation's median grant in 2025 was $10,000, and its average grant was $12,500, across 18 grants on its 2025 IRS Form 990-PF. Organizations receiving their first grant from Marinus and Minna B Koster Foundation that year got $20K on average.
Where does Marinus and Minna B Koster Foundation give grants?
Marinus and Minna B Koster Foundation's top state is District of Columbia, with 41% of the grant dollars itemized on its 2025 IRS Form 990-PF. The next largest states were New York (26%) and Maryland (16%). The most frequent recipient cities were Washington, DC (6 grants), New York, NY (6 grants) and North Bethesda, MD (2 grants).
Does Marinus and Minna B Koster Foundation give general operating support?
Not in 2025: none of the 18 grants with a stated purpose on Marinus and Minna B Koster Foundation's 2025 IRS Form 990-PF were described as general or operating support.
Who are Marinus and Minna B Koster Foundation's largest grantees?
Marinus and Minna B Koster Foundation's largest 2025 grantees include Edlavitch Jewish Community Center of DC ($30,000), DC Youth Orchestra Program ($20,000) and Strathmore Hall Foundation ($20,000 across 2 grants), according to its 2025 IRS Form 990-PF. Together they received 31% of its itemized 2025 grant dollars.
How large is Marinus and Minna B Koster Foundation?
Marinus and Minna B Koster Foundation reported $7.5M in total assets on its 2025 IRS Form 990-PF. It paid out $333K in qualifying distributions that year, against a required minimum of $356K (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 does Marinus and Minna B Koster Foundation fund?
The foundation’s mission is to provide scholarships and financial assistance to musically talented children and young adults; promote the preservation of Yiddish culture, including its language, theater, and scholarship; and assist immigrants—especially Jewish immigrants—with housing, language, job training, and other services. See mission & focus areas ↑
How do I apply for a grant from Marinus and Minna B Koster Foundation?
The 2024 filing says application instructions are available on the foundation’s website. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is Marinus and Minna B Koster Foundation's EIN?
Marinus and Minna B Koster Foundation's EIN (Employer Identification Number) is 27-1533411. 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. Research dossier generated September 2026.
Here's the math on researching Marinus and Minna B Koster Foundation by hand.
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