Mark and Martha Slaughter
Mark and Martha Slaughter is a private foundation focused on Science & Technology, based in Louisville, KY. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $481K in total assets. In 2025, it awarded 5 grants totaling $17K. Net investment income was $10K.
Mark and Martha Slaughter at a glance
In short: Mark and Martha Slaughter gave $17K across 5 grants in 2025 (avg $3K), top state Kentucky. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $17,000
- -20.6% vs 2024
- Grants made (2025)
- 5
- -28.6% vs 2024
- Average grant
- $3,400
- +11.2% vs 2024
- Median grant
- $5,000
- Total assets
- $480,902
- -1.8% vs 2024
- Primary geography
- Kentucky (41% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated September 2026.
Who Mark and Martha Slaughter funds
How this funder distributes its grants
Top Recipients
Top 5 recipients in 2025
The largest 2025 recipient was Bernheim Arboretum & Research Forest ($5K). Together the top 5 received $17K.
Grant Size Distribution
14 grants across all recorded years
The most common grant size was under $50K: 14 grants of 14 (100%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 5 itemized grants.
Cities
How Mark and Martha Slaughter gives
- In 2025 it paid out 66% of its IRS minimum distribution (the 5% rule). Foundations have until the end of the next year to meet it. Method
From the foundation's IRS Form 990 filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2023 to 2025, annual grant giving ranged from $11K (2023) to $21K (2024). In 2025 it made 5 grants totaling $17K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Bernheim Arboretum & Research Forest Clermont, KY | General Operating | $5,000 |
| Ishlt Foundation Chicago, IL | Francis D. Pagani, MD Endowed Mentorship Award | $5,000 |
| Purdue Research Foundation West Lafayette, IN | Lyles School of Civil and Construction Engineering | $5,000 |
| American Heart Association Louisville, KY | Jewish Hospital Aha Kentuckiana Heart Walk Team | $1,000 |
| Louisville Collegiate School Louisville, KY | Annual Fund | $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 | $480,902 | $14,301 | $23,245 | $17,000 | 5 | $18,500 | $10,052 | $27,876 |
| 2024 | $489,718 | $39,721 | $26,822 | $21,400 | 7 | $22,650 | $35,667 | $25,821 |
| 2023 | $476,829 | $13,396 | $25,511 | $11,000 | 2 | $20,360 | $8,512 | $24,314 |
| 2022 | $482,150 | — | $5,559 | — | — | — | — | — |
| 2021 | $487,709 | — | $23,871 | — | — | — | — | — |
| 2020 | $511,305 | $6,970 | $12,294 | — | — | — | — | — |
Under IRS private-foundation payout rules, Mark and Martha Slaughter reported a distributable amount of $28K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Mark and Martha Slaughter is led by Mark S. Slaughter, President on every filing since 2020; none of the 5 officers listed in 2025 report compensation.
Officers on the 2025 filing
Mark S. Slaughter
President
On filings since 2020
1 hr/week
No compensation reported
Martha W. Slaughter
President
Secretary → President, 2025
On filings since 2023
1 hr/week
No compensation reported
Ian Slaughter
Director
On filings since 2023
1 hr/week
No compensation reported
Jack Slaughter
Director
On filings since 2023
1 hr/week
No compensation reported
Katherine Slaughter
Director
On filings since 2023
1 hr/week
No compensation reported
Former officers (4)
- Former: Brian Ganzel (2020–2022) — Vice President
- Former: Steven Koening (2020–2022) — Director
- Former: Meghan Rozema (2021–2022) — Treasurer
- Former: Debra Riley (2020–2021) — Treasurer
Data from IRS Form 990 filings, 2020–2025. "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 Mark and Martha Slaughter
How much does Mark and Martha Slaughter give each year?
Mark and Martha Slaughter gave $17K across 5 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $21K across 7 grants.
What is Mark and Martha Slaughter's typical grant size?
Mark and Martha Slaughter's median grant in 2025 was $5,000, and its average grant was $3,400, across 5 grants on its 2025 IRS Form 990-PF.
Where does Mark and Martha Slaughter give grants?
Mark and Martha Slaughter's top state is Kentucky, with 41% of the grant dollars itemized on its 2025 IRS Form 990-PF. The next largest states were Illinois (29%) and Indiana (29%). The most frequent recipient cities were Louisville, KY (2 grants).
Does Mark and Martha Slaughter give general operating support?
Yes: 40% of Mark and Martha Slaughter's 2025 grants with a stated purpose (2 of 5) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are Mark and Martha Slaughter's largest grantees?
Mark and Martha Slaughter's largest 2025 grantees include Bernheim Arboretum & Research Forest ($5,000), Ishlt Foundation ($5,000) and Purdue Research Foundation ($5,000), according to its 2025 IRS Form 990-PF. Together they received 88% of its itemized 2025 grant dollars.
How large is Mark and Martha Slaughter?
Mark and Martha Slaughter reported $481K in total assets on its 2025 IRS Form 990-PF. It paid out $19K in qualifying distributions that year, against a required minimum of $28K (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 is Mark and Martha Slaughter?
Mark and Martha Slaughter is a private foundation focused on Science & Technology, based in Louisville, KY. It holds $481K in total assets as of 2025.
What is Mark and Martha Slaughter's EIN?
Mark and Martha Slaughter's EIN (Employer Identification Number) is 26-3109983. IRS Form 990 filing data is available on this page for 2020–2025.
Data last updated September 2026. Sourced from IRS Form 990 filings.
Data update history
(4)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2023 (received by the IRS June 13, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS April 11, 2025)
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 13, 2026)
- IRS filings on file for fiscal years 2020–2024
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