Martha P Mack Foundation
Martha P Mack Foundation is a private foundation, based in Detroit, MI. IRS filing data is available from 2021 through 2024. As of 2024, the organization holds $23.1M in total assets. In 2024, it awarded 9 grants totaling $1.8M. Net investment income was $6.1M.
Martha P Mack Foundation at a glance
In short: Martha P Mack Foundation gave $1.8M across 9 grants in 2024 (avg $198K), mostly in California. Source: 2024 IRS Form 990-PF.
- Annual giving (2024)
- $1,785,000
- +55.2% vs 2023
- Grants made (2024)
- 9
- +125.0% vs 2023
- Average grant
- $198,333
- -31.0% vs 2023
- Median grant
- $100,000
- Total assets
- $23,114,274
- +18.4% vs 2023
- Primary geography
- California (99% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990-PF, 2024 View filing
Data from IRS Form 990-PF, 2024; updated October 2026.
Who Martha P Mack Foundation funds
How this funder distributes its grants
Top Recipients
Top 9 recipients in 2024
The largest 2024 recipient was Sanford Burnham Prebys Medical Discovery Institute ($500K). Together the top 9 received $1.8M.
Grant Size Distribution
19 grants across all recorded years
The most common grant size was in the $100–250K range: 9 grants of 19 (47%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2024 grant dollars across all 9 itemized grants.
States
Cities
How Martha P Mack Foundation gives
- In 2024 it paid out 176% 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 2022 to 2024, annual grant giving ranged from $456K (2022) to $1.8M (2024). In 2024 it made 9 grants totaling $1.8M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Sanford Burnham Prebys Medical Discovery Institute La Jolla, CA | For Support of Daily | $500,000 |
| Scripps Health Foundation La Jolla, CA | For Support of Daily | $500,000 |
| Uc San Diego Foundation La Jolla, CA | For Support of Daily | $405,000 |
| The Scripps Research Institute La Jolla, CA | For Support of Daily | $100,000 |
| Salk Institute for Biological Studies La Jolla, CA | For Support of Daily | $100,000 |
| Sharp Healthcare Foundation San Diego, CA | For Support of Daily | $100,000 |
| The Salvation Army Rancho Palos Verdes, CA | For Support of Daily | $50,000 |
| Southern Methodist University Dallas, TX | For Support of Daily | $25,000 |
| La Jolla Institute of Immunology La Jolla, CA | For Support of Daily | $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 |
|---|---|---|---|---|---|---|---|---|
| 2024 | $23,114,274 | $6,237,732 | $1,943,465 | $1,785,000 | 9 | $1,795,813 | $6,101,970 | $1,021,350 |
| 2023 | $19,525,151 | $12,238,487 | $1,273,344 | $1,150,000 | 4 | $1,216,778 | $420,511 | $672,970 |
| 2022 | $8,620,209 | $-292,601 | $614,432 | $456,000 | 6 | $502,475 | $198,430 | $424,586 |
| 2021 | $9,533,803 | $15,359,074 | $31,447 | — | — | $20,225 | $5,280,244 | $47,124 |
Under IRS private-foundation payout rules, Martha P Mack Foundation reported a distributable amount of $1.0M for 2024 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Martha P Mack Foundation's 2024 filing lists 2 officers; all 2 officers listed in 2024 are compensated.
Officers on the 2024 filing
Bank Of America NA
Prior Trustee
New on the 2024 filing
2 hrs/week
$101K (2024)
Comerica Bank
Trustee
New on the 2024 filing
2 hrs/week
$6K (2024)
Former officers (1)
- Former: Bank Of America N A (2021–2023) — Trustee
Data from IRS Form 990 filings, 2021–2024. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Compensation Overview
From 2024 IRS filing
The highest reported compensation on the 2024 filing was $101K, to Bank of America NA (Prior Trustee). 2 officers or directors reported compensation on that filing.
Frequently asked questions about Martha P Mack Foundation
How much does Martha P Mack Foundation give each year?
Martha P Mack Foundation gave $1.8M across 9 grants in 2024, according to its 2024 IRS Form 990-PF. In 2023 it gave $1.1M across 4 grants.
What is Martha P Mack Foundation's typical grant size?
Martha P Mack Foundation's median grant in 2024 was $100,000, and its average grant was $198,333, across 9 grants on its 2024 IRS Form 990-PF.
Where does Martha P Mack Foundation give grants?
Martha P Mack Foundation gives mostly in California: 99% of the grant dollars itemized on its 2024 IRS Form 990-PF went to recipients there. The most frequent recipient cities were La Jolla, CA (6 grants).
Does Martha P Mack Foundation give general operating support?
Not in 2024: none of the 9 grants with a stated purpose on Martha P Mack Foundation's 2024 IRS Form 990-PF were described as general or operating support. Recurring purposes include "For Support of Daily" (9 grants).
Who are Martha P Mack Foundation's largest grantees?
Martha P Mack Foundation's largest 2024 grantees include Sanford Burnham Prebys Medical Discovery Institute ($500,000), Scripps Health Foundation ($500,000) and Uc San Diego Foundation ($405,000), according to its 2024 IRS Form 990-PF. Together they received 79% of its itemized 2024 grant dollars.
How large is Martha P Mack Foundation?
Martha P Mack Foundation reported $23.1M in total assets on its 2024 IRS Form 990-PF. It paid out $1.8M in qualifying distributions that year, against a required minimum of $1.0M (roughly 5% of its investment assets).
What is Martha P Mack Foundation's EIN?
Martha P Mack Foundation's EIN (Employer Identification Number) is 30-6702159. IRS Form 990 filing data is available on this page for 2021–2024.
Data last updated October 2026. Sourced from IRS Form 990-PF filings.
Data update history
(2)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2024 (received by the IRS November 3, 2025)
- IRS filings on file for fiscal years 2021–2024
Live grants for the work Martha P Mack Foundation funds
Philanthropy, Voluntarism & Grantmaking Open opportunities, soonest deadline first.
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Browse active grant opportunities in Martha P Mack Foundation's focus areas in our free grants database
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