The Jacob & Ruth Mazer Foundation
The Jacob & Ruth Mazer Foundation is a private foundation based in Denver, Colorado. Its 2025 filing reports 20 grants totaling $37,550 to organizations in several states, including organizations working in areas such as reproductive health, civil liberties, community support, and environmental conservation.
The Jacob & Ruth Mazer Foundation at a glance
In short: The Jacob & Ruth Mazer Foundation gave $38K across 20 grants in 2025 (avg $2K), mostly in New York. 30% of 2025 grantees were new. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $37,550
- +2.0% vs 2024
- Grants made (2025)
- 20
- +81.8% vs 2024
- Average grant
- $1,878
- -43.9% vs 2024
- Median grant
- $1,000
- Total assets
- $347,469
- +3.1% vs 2024
- New grantees (estimate)
- 30% first-time grantees (6 of 20, 2025; small sample)
- Primary geography
- New York (51% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated October 2026. New grantees are estimated by matching recipient names across years (methodology).
How to apply to The Jacob & Ruth Mazer Foundation
- How to Apply
-
The foundation’s filing says applications must be in writing. It identifies Michael Mazer as the contact, states that there are no deadlines, and says awards are limited only by the Internal Revenue Code. The filing also says the foundation does not restrict giving to preselected organizations.
- Contact
Application contact: Michael Mazer
Mailing address: 375 Detroit Street, Denver, CO 80206
Phone: (720) 244-5216
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who The Jacob & Ruth Mazer Foundation funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2025
The largest 2025 recipient was Planned Parenthood ($9K). Together the top 10 received $32K.
Grant Size Distribution
62 grants across all recorded years
The most common grant size was under $50K: 62 grants of 62 (100%).
Geographic Focus
Where this funder awards grants
The foundation is based in Denver, Colorado. In 2025, 51% of grant dollars went to recipients in New York, 23% to Colorado, 12% to Maine, 4% to Connecticut, and 4% to California. The listed grants also include $500 to the Southern Poverty Law Center in Alabama.
Grant Distribution by State
Share of 2025 grant dollars across all 20 itemized grants.
States
Cities
Is The Jacob & Ruth Mazer Foundation open to new grantees?
30%
first-time grantees, 2025
In 2025, 6 of 20 grantees (30%) were first-time recipients. With only 20 grantees, that is a small sample: one grantee more or less moves the share by about 5 points. First grants averaged $867; repeat grants $2K. How we count
Medians: $850 first-time, $1K repeat.
- 45% of 2025 grantees were also funded in 2024. Method
- Giving held roughly steady from 2022 to 2025 (−4%). Method
- In 2025 it paid out 120% of its IRS minimum distribution (the 5% rule). Method
Estimate from itemized grant lists in IRS Form 990-PF filings (2019–2025). Recipient names are matched across years, so a renamed or misspelled grantee can look new; grants to individuals are left out. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2019 to 2025, annual grant giving ranged from $17K (2021) to $39K (2022). In 2025 it made 20 grants totaling $38K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Planned Parenthood New York, NY | General Grant | $8,500 |
| Civic Canopy Denver, CO | General Grant | $5,000 |
| ACLU Foundation New York, NY | General Grant | $5,000 |
| Yale Alumni New York, NY | General Grant | $3,000 |
| Osborne Association Bronx, NY | General Grant | $2,800 |
| Jewish Colorado Denver, CO | General Grant | $2,750 |
| Camp Kesem Covina, CA | General Grant | $1,500 |
| Greenwich Hospital Foundation Cos Cob, CT | General Grant | $1,000 |
| Denver Museum of Nature Science Denver, CO | General Grant | $1,000 |
| Friends of Casco Bay Portland, ME | General Grant | $1,000 |
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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 | $347,469 | $54,150 | $43,721 | $37,550 | 20 | $37,550 | $48,225 | $31,379 |
| 2024 | $337,040 | $23,732 | $43,053 | $36,800 | 11 | $36,800 | $17,670 | $29,277 |
| 2023 | $356,361 | $19,929 | $32,727 | $25,200 | 9 | $25,200 | $13,749 | $25,344 |
| 2022 | $369,159 | $35,251 | $45,578 | $39,250 | 10 | $39,250 | $30,337 | $24,995 |
| 2021 | $379,486 | $48,716 | $24,947 | $17,440 | 12 | $17,440 | $42,163 | $27,113 |
| 2020 | $355,717 | $14,026 | $44,450 | $38,800 | 24 | — | $9,259 | $22,275 |
| 2019 | $386,141 | $14,033 | $36,997 | $31,890 | 25 | — | $9,726 | $23,207 |
Under IRS private-foundation payout rules, The Jacob & Ruth Mazer Foundation reported a distributable amount of $31K for 2025 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement for the foundation is provided. Its 2025 grantees include organizations with varied missions. For example, Friends of Casco Bay says its mission is to improve and protect the environmental health of Casco Bay, Maine. The Maine People’s Resource Center describes its work as helping Maine people organize in their communities and build capacity to participate in decision-making and social-justice campaigns. The Royal River Conservation Trust says it stewards land and conservation easements to protect land and water resources for the public. The Southern Poverty Law Center describes its work as advancing racial justice and human rights and dismantling white supremacy.
Grantmaking
In 2025, the foundation made 20 grants totaling $37,550. Grant amounts ranged from $500 to $8,500, with a median of $1,000. Among the largest grants were $8,500 to Planned Parenthood in New York, $5,000 each to Civic Canopy in Denver and the ACLU Foundation in New York, $3,000 to Yale Alumni in New York, and $2,800 to the Osborne Association in the Bronx. These grants were listed as general grants. Other 2025 grants included $1,000 to Friends of Casco Bay, $500 to the Southern Poverty Law Center, $500 to the Maine People’s Resource Center, and $500 to the Royal River Conservation Trust.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists Michael Mazer as President and Harriet Mazer as Treasurer.
The Jacob & Ruth Mazer Foundation is led by Michael Mazer, President on every filing since 2019; none of the 2 officers listed in 2025 report compensation.
Officers on the 2025 filing
Michael Mazer
President
On filings since 2019
No compensation reported
Harriet Mazer
Treasurer
On filings since 2019
No compensation reported
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.
Frequently asked questions about The Jacob & Ruth Mazer Foundation
How much does The Jacob & Ruth Mazer Foundation give each year?
The Jacob & Ruth Mazer Foundation gave $38K across 20 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $37K across 11 grants.
What is The Jacob & Ruth Mazer Foundation's typical grant size?
The Jacob & Ruth Mazer Foundation's median grant in 2025 was $1,000, and its average grant was $1,878, across 20 grants on its 2025 IRS Form 990-PF. Organizations receiving their first grant from The Jacob & Ruth Mazer Foundation that year got $867 on average.
Where does The Jacob & Ruth Mazer Foundation give grants?
The Jacob & Ruth Mazer Foundation gives mostly in New York: 51% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest states were Colorado (23%) and Maine (12%). The most frequent recipient cities were New York, NY (3 grants), Denver, CO (3 grants), Portland, ME (3 grants) and Yarmouth, ME (2 grants).
Does The Jacob & Ruth Mazer Foundation give general operating support?
Yes: 100% of The Jacob & Ruth Mazer Foundation's 2025 grants with a stated purpose (20 of 20) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are The Jacob & Ruth Mazer Foundation's largest grantees?
The Jacob & Ruth Mazer Foundation's largest 2025 grantees include Planned Parenthood ($8,500), Civic Canopy ($5,000) and ACLU Foundation ($5,000), according to its 2025 IRS Form 990-PF. Together they received 49% of its itemized 2025 grant dollars.
How large is The Jacob & Ruth Mazer Foundation?
The Jacob & Ruth Mazer Foundation reported $347K in total assets on its 2025 IRS Form 990-PF. It paid out $38K in qualifying distributions that year, against a required minimum of $31K (roughly 5% of its investment assets).
What does The Jacob & Ruth Mazer Foundation fund?
No mission statement for the foundation is provided. Its 2025 grantees include organizations with varied missions. For example, Friends of Casco Bay says its mission is to improve and protect the environmental health of Casco Bay, Maine. See mission & focus areas ↑
How do I apply for a grant from The Jacob & Ruth Mazer Foundation?
The foundation’s filing says applications must be in writing. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is The Jacob & Ruth Mazer Foundation's EIN?
The Jacob & Ruth Mazer Foundation's EIN (Employer Identification Number) is 13-6115875. IRS Form 990 filing data is available on this page for 2019–2025.
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
Data update history
(7)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2024 (received by the IRS May 7, 2025)
- Updated Form 990-PF for fiscal year 2025 (received by the IRS May 7, 2026)
- Added Form 990-PF for fiscal year 2019 (received by the IRS June 22, 2020)
- Updated Form 990-PF for fiscal year 2020 (received by the IRS July 20, 2021)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS May 11, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS May 10, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS April 30, 2024)
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