Mark Diehl Trust
Mark Diehl Trust is a private foundation, based in Claremore, OK. IRS filing data is available from 2021 through 2025. As of 2025, the organization holds $705K in total assets. In 2025, it awarded 4 grants totaling $42K. Net investment income was $34K.
Mark Diehl Trust at a glance
In short: Mark Diehl Trust gave $42K across 4 grants in 2025 (avg $11K), mostly in Oklahoma. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $42,409
- +8.9% vs 2024
- Grants made (2025)
- 4
- +0.0% vs 2024
- Average grant
- $10,602
- +8.9% vs 2024
- Median grant
- $5,301
- Total assets
- $704,808
- -1.8% vs 2024
- Primary geography
- Oklahoma (100% 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 Diehl Trust funds
How this funder distributes its grants
Top Recipients
Top 4 recipients in 2025
The largest 2025 recipient was Oklahoma Medical Research Foundation ($28K). Together the top 4 received $42K.
Grant Size Distribution
20 grants across all recorded years
The most common grant size was under $50K: 20 grants of 20 (100%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 4 itemized grants.
States
Cities
How Mark Diehl Trust gives
- Giving held roughly steady from 2022 to 2025 (+12%). Method
- In 2025 it paid out 91% 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-PF filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2021 to 2025, annual grant giving ranged from $8K (2021) to $42K (2025). In 2025 it made 4 grants totaling $42K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Oklahoma Medical Research Foundation Oklahoma City, OK | General Purposes | $27,566 |
| Sacred Heart Catholic Church Fairfax, OK | General Purposes | $6,361 |
| Roman Catholic Diocese of Tulsa Tulsa, OK | General Purposes | $4,241 |
| Fairfax Public Library Fairfax, OK | General Purposes | $4,241 |
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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 | $704,808 | $44,292 | $57,035 | $42,409 | 4 | $46,524 | $34,322 | $51,151 |
| 2024 | $717,549 | $39,945 | $50,658 | $38,928 | 4 | $44,328 | $34,272 | $47,809 |
| 2023 | $728,081 | $34,771 | $48,273 | $37,940 | 4 | $42,962 | $29,477 | $43,950 |
| 2022 | $741,424 | $14,970 | $48,624 | $37,846 | 4 | $41,087 | $11,813 | $41,182 |
| 2021 | $775,264 | $20,250 | $20,078 | $7,922 | 4 | $11,435 | $11,600 | $49,280 |
Under IRS private-foundation payout rules, Mark Diehl Trust reported a distributable amount of $51K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Mark Diehl Trust's only listed officer is RCB Bank, Trustee on every filing since 2021 (compensated).
Officers on the 2025 filing
RCB Bank
Trustee
On filings since 2021
2 hrs/week
$5K (2021) → $8K (2025)
Data from IRS Form 990 filings, 2021–2025. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Compensation Overview
From 2025 IRS filing
The highest reported compensation on the 2025 filing was $8K, to RCB Bank (Trustee).
Frequently asked questions about Mark Diehl Trust
How much does Mark Diehl Trust give each year?
Mark Diehl Trust gave $42K across 4 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $39K across 4 grants.
What is Mark Diehl Trust's typical grant size?
Mark Diehl Trust's median grant in 2025 was $5,301, and its average grant was $10,602, across 4 grants on its 2025 IRS Form 990-PF.
Where does Mark Diehl Trust give grants?
Mark Diehl Trust gives mostly in Oklahoma: 100% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The most frequent recipient cities were Fairfax, OK (2 grants).
Does Mark Diehl Trust give general operating support?
Yes: 100% of Mark Diehl Trust's 2025 grants with a stated purpose (4 of 4) were for general or operating support, per its 2025 IRS Form 990-PF.
How large is Mark Diehl Trust?
Mark Diehl Trust reported $705K in total assets on its 2025 IRS Form 990-PF. It paid out $47K in qualifying distributions that year, against a required minimum of $51K (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 Diehl Trust's EIN?
Mark Diehl Trust's EIN (Employer Identification Number) is 73-6215491. IRS Form 990 filing data is available on this page for 2021–2025.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Data update history
(6)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2021 (received by the IRS November 21, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS May 17, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS May 9, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS April 30, 2025)
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 11, 2026)
- IRS filings on file for fiscal years 2021–2024
Explore Open Grants
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