The Frank B Mazer Foundation

Private foundation · Grantmaker Cambridge, MA EIN: 04-6875253

The Frank B Mazer Foundation is a private foundation, based in Cambridge, MA. IRS filing data is available from 2019 through 2025. As of 2025, the organization holds $180K in total assets. In 2025, it awarded 5 grants totaling $3K. Net investment income was $311.

Key facts about The Frank B Mazer Foundation

In short: The Frank B Mazer Foundation gave $3K across 5 grants in 2025 (avg $558), top state Maine. Source: 2025 IRS Form 990-PF.

EIN
04-6875253
Latest 990 filing
Form 990-PF, 2025
Annual giving (2025)
$2,790
Grants made (2025)
5
Average grant
$558
Median grant
$500
Total assets
$180,455
Primary geography
Maine (38% of itemized 2025 grant dollars)

Data from IRS Form 990-PF, 2025; updated September 2026.

Financial Overview

From 2025 IRS Form 990-PF · View filing

Total Assets

$180K

-62.9% YoY

Annual Giving

$3K

-62.8% YoY

Grant Count

5

+66.7% YoY

Avg Grant Size

$558

-77.7% YoY

How The Frank B Mazer Foundation gives

  • Giving fell 80% from 2022 to 2025. Method

From the foundation's IRS Form 990-PF filings. Methodology.

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Geographic Focus

Where this funder awards grants

Grant Distribution by State

12states

Share of all 5 itemized 2025 grant dollars.

Cities

IslesboroWashingtonBostonWatertownBrooklineCambridgeJenkintownDenverNew YorkPrescottAmericusArlingtonAshlandConcordFairfieldIsleboroIslesboroughLincolnLittle RockMilford

Giving Over Time

Total grant dollars and number of grants per year

$0$20K$40K$60K$80K10 grants201925 grants20209 grants20214 grants20225 grants20233 grants20245 grants2025

From 2019 to 2025, annual grant giving ranged from $3K (2025) to $65K (2020). In 2025 it made 5 grants totaling $3K.

Grant Insights

How this funder distributes its grants

Top Recipients

Top 5 recipients in 2025

WGBH Educational Foundation: $1KWGBH Educational Foundation$1KGlen Dubose: $650Glen Dubose$650USA for UNHCR: $500USA for UNHCR$500Islesboro Historical Society: $400Islesboro Historical Society$400AmerSocietyPreventionCrueltyAnimals: $240AmerSocietyPreventionCrueltyA…$240

The largest 2025 recipient was WGBH Educational Foundation ($1K). Together the top 5 received $3K.

Grant Size Distribution

26 grants across all recorded years

26<$50K$50–100K$100–250K$250–500K$500K–1M$1–5M$5M+

The most common grant size was under $50K: 26 grants of 26 (100%).

Giving History

Grant recipients and amounts by year

RecipientPurposeAmount
WGBH Educational Foundation Boston, MAEducational purposes$1,000
Glen Dubose Islesboro, MEGrant Recipient in a Music Documentary Project$650
USA for UNHCR Washington, DCRefugee Assistance;UN Refugee Agency$500
Islesboro Historical Society Islesboro, MEEducational Purposes$400
AmerSocietyPreventionCrueltyAnimals New York, NYPrevention of Cruelty to Animals$240

Financial History

Multi-year comparison from IRS filings

Revenue
Expenses
Qualifying Distributions
Net Investment Income
$0$50K$100K$150K$200K2019202020212022202320242025
Metric202520242023
Total Assets$180,455$486,084$584,723
Revenue$346$4,836$28,646
Expenses$2,825$10,844$18,458
Qualifying Distributions$2,790$7,500$15,000
Net Investment Income$311$4,456$28,188
Distributable Amount———

Data update history

When this profile's IRS filing data changed on Grantable

  1. Added Form 990-PF for fiscal year 2019 (received by the IRS August 6, 2020)
  2. Added Form 990-PF for fiscal year 2025 (received by the IRS July 18, 2026)
  3. IRS filings on file for fiscal years 2020–2024

Leadership & Key People

Officers and directors from IRS filings

The Frank B Mazer Foundation is led by Frank B. Mazer, Trustee on every filing since 2019 — the only officer listed, and uncompensated.

Officers on the 2025 filing

  • Frank B. Mazer

    Trustee

    On filings since 2019

    1 hr/week

    $40K (2019) → $0 (2025)

Data from IRS Form 990 filings, 2019–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.

Compensation Overview

No officer or director reported compensation in the available filings.

Frequently asked questions about The Frank B Mazer Foundation

How much does The Frank B Mazer Foundation give each year?

The Frank B Mazer Foundation gave $3K across 5 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $8K across 3 grants.

What is The Frank B Mazer Foundation's typical grant size?

The Frank B Mazer Foundation's median grant in 2025 was $500, and its average grant was $558, across 5 grants on its 2025 IRS Form 990-PF.

Where does The Frank B Mazer Foundation give grants?

The Frank B Mazer Foundation's top state is Maine, with 38% of the grant dollars itemized on its 2025 IRS Form 990-PF. The next largest states were Massachusetts (36%) and District of Columbia (18%). The most frequent recipient cities were Islesboro, ME (2 grants).

Does The Frank B Mazer Foundation give general operating support?

Not in 2025: none of the 5 grants with a stated purpose on The Frank B Mazer Foundation's 2025 IRS Form 990-PF were described as general or operating support.

Who are The Frank B Mazer Foundation's largest grantees?

The Frank B Mazer Foundation's largest 2025 grantees include WGBH Educational Foundation ($1,000), Glen Dubose ($650) and USA for UNHCR ($500), according to its 2025 IRS Form 990-PF. Together they received 77% of its itemized 2025 grant dollars.

How large is The Frank B Mazer Foundation?

The Frank B Mazer Foundation reported $180K in total assets on its 2025 IRS Form 990-PF. Its revenue that year was $346.

What is The Frank B Mazer Foundation's EIN?

The Frank B Mazer Foundation's EIN (Employer Identification Number) is 04-6875253. IRS Form 990 filing data is available on this page for 2019–2025.

Data last updated September 2026. Sourced from IRS Form 990-PF filings.

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