Marinus and Minna B Koster Foundation

POTOMAC FALLS, VA EIN: 27-1533411

Marinus and Minna B Koster Foundation is a private foundation focused on Philanthropy, Voluntarism & Grantmaking, based in POTOMAC FALLS, VA. IRS filing data is available from 2020 through 2024. As of 2024, the organization holds $7.0M in total assets. In 2024, it awarded 19 grants totaling $205K. Net investment income was $436K.

Financial Overview

From 2024 IRS Form 990-PF · View filing

Total Assets

$7.0M

+10.7% YoY

Annual Giving

$205K

+10.8% YoY

Grant Count

+11.8% YoY

Avg Grant Size

$11K

-0.9% YoY

Under IRS private-foundation payout rules, Marinus and Minna B Koster Foundation reported a distributable amount of $320K for 2024 — the minimum it must pay out in qualifying distributions.

About Marinus and Minna B Koster Foundation

Based on IRS filings

Focus Areas

Philanthropy, Voluntarism & Grantmaking

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Geographic Focus

Where this funder awards grants

Grant Distribution by State

District of Columbia $451K (43%)

New York $294K (28%)

Maryland $133K (13%)

Pennsylvania $83K (8%)

Virginia $83K (8%)

States

District of Columbia Maryland New York Pennsylvania Virginia

Cities

AnnandaleArlingtonBethesdaCollege ParkNew YorkNorth BethesdaPittsburghRockvilleSilver SpringStaten IslandWashington

Financial History

Multi-year comparison from IRS filings

Revenue

Expenses

Qualifying Distributions

Net Investment Income

Metric	2024	2023	2022
Total Assets	$6,992,775	$6,319,551	$5,824,634
Revenue	$463,944	$212,480	$289,287
Expenses	$329,891	$325,598	$398,032
Qualifying Distributions	$301,791	$293,050	$359,629
Net Investment Income	$435,844	$179,932	$250,884
Distributable Amount	$320,432	$293,884	$330,245

Giving Over Time

Total grant dollars and number of grants per year

Grant Insights

How this funder distributes its grants

Top Recipients

Top 10 recipients in 2024

Grant Size Distribution

94 grants across all recorded years

Open Grants

1 open opportunity from Marinus and Minna B Koster Foundation

Foundation

Koster Foundation Grant

MARINUS AND MINNA B KOSTER FOUNDATION

Amount

US $5,000 - US $50,000

Deadline

Rolling / Open

Giving History

Grant recipients and amounts by year

Among its reported 2024 grants, the largest include Edlavitch Jewish Community Center of Washington Dc ($26,000), Dc Youth Orchestra Progam ($15,000), Pennsylvania Women Work ($15,000).

Recipient	Purpose	Amount
AMERICAN UNIVERSITY WASHINGTON, DC	SUMMER MUSIC STUDY FOR AU MUSIC MAJORS TO BE DONE OFF CAMPUS.	$10,000
AMERICAN YOUTH PHILHARMONIC ORCHESTRA ANNANDALE, VA	TUITION ASSISTANCE PROGRAM FOR LOW-INCOME STUDENTS IN NORTHERN VIRGINIA.	$10,000
AVODAH - THE JEWISH SERVICE CORPS NEW YORK, NY	SUPPORT FOR THE SERVICE CORPS IMMERSIVE PROGRAM	$10,000
CENTER FOR TRADITIONAL MUSIC & DANCE NEW YORK, NY	TO HELP PROMOTE/FUND MUSIC AND DANCE PROJECTS FOR JEWISH CULTURE.	$10,000
DC YOUTH ORCHESTRA PROGAM WASHINGTON, DC	SUPPORT FOR THE TALENT DEVELOPMENT PROGRAM; OFFERING PRIVATE LESSONS, MENTORSHIP, PERFOMANCE OPPORTUNITIES, AND SUMMER LEARNING OPPORTUNITIES.	$15,000
DI GOLDENE KEYT LTD NEW YORK, NY	GENERAL SUPPORT FOR MUSIC AND DANCE PROJECTS FROM YIDDISH CULTURE.	$7,000
EDLAVITCH JEWISH COMMUNITY CENTER OF WASHINGTON DC WASHINGTON, DC	TO SUPPORT THE FOURTH YEAR OF THEATER J'S YIDDISH THEATER LAB, A PROGRAM DEVOTED TO DEVELOPING NEW AUDIENCES FOR, NEW ADAPTATIONS OF, AND NEW DIRECTORIAL APPROACHES TO WORK FROM THE YIDDISH THEATER CANON.	$26,000
EDU-FUTURO ARLINGTON, VA	TO SUPPORT FOR THE EMERGING LEADERS PROGRAM	$8,000
HIAS SILVER SPRING, MD	TO SUPPORT VITAL SERVICES FOR REFUGEES AND ASYLUM SEEKERS WORLDWIDE, PROVIDING THEM WITH THE NECESSARY RESOURCES AND ADVOCACY TO REBUILD THEIR LIVES WITH DIGNITY AND SECURITY, IN LINE WITH JEWISH VALUES AND HISTORICAL COMMITMENT TO PROTECTING THE VULNERABLE.	$5,000
IN GEVEB INC NEW YORK, NY	GENERAL OPERATIONAL SUPPORT FOR THE CONTINUED PUBLICATION OF IN GEVEB: A JOURNAL OF YIDDISH STUDIES.	$8,000

Leadership & Key People

Officers and directors from IRS filings

Compensation Overview

From 2024 IRS filing

From 2024 filing

Name	Title	Hours	Compensation
ROSETTE M WILLS	PRESIDENT	2	$17,500
BARBARA FREEDMAN	SECRETARY	2	$17,500
MICHAEL T FLYNN	TREASURER	2	$17,500
STERLING E SCROGGINS	ADVISOR	1	$3,500
MIRIAM ISAACS	ADVISOR	1	$3,500

Subject Areas

Focus areas based on grantmaking activity

Philanthropy, Voluntarism & Grantmaking

Frequently Asked Questions

What is Marinus and Minna B Koster Foundation?

Marinus and Minna B Koster Foundation is a private foundation focused on Philanthropy, Voluntarism & Grantmaking, based in POTOMAC FALLS, VA. It holds $7.0M in total assets as of 2024.

How large is Marinus and Minna B Koster Foundation?

As of 2024, Marinus and Minna B Koster Foundation holds $7.0M in total assets with $464K in annual revenue. It awarded 19 grants totaling $205K in 2024.

Where does Marinus and Minna B Koster Foundation operate?

Marinus and Minna B Koster Foundation has awarded grants in District of Columbia, Maryland, New York, Pennsylvania, Virginia.

What size grants does Marinus and Minna B Koster Foundation award?

In 2024, Marinus and Minna B Koster Foundation awarded 19 grants totaling $205K — an average of about $11K per grant, based on its IRS Form 990 filings.

How much is Marinus and Minna B Koster Foundation required to give away each year?

Private foundations must generally distribute about 5% of their assets annually. For 2024, Marinus and Minna B Koster Foundation reported a distributable amount of $320K on its IRS Form 990-PF — the minimum it must pay out in qualifying distributions.

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 2020–2024.