C Stone Foundation
C Stone Foundation is a private foundation, based in San Antonio, TX. IRS filing data is available from 2020 through 2025. As of 2025, the organization holds $1.8M in total assets. In 2025, it awarded 8 grants totaling $205K. Net investment income was $367K.
C Stone Foundation at a glance
In short: C Stone Foundation gave $205K across 8 grants in 2025 (avg $26K), mostly in Montana. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $205,000
- -90.9% vs 2024
- Grants made (2025)
- 8
- +14.3% vs 2024
- Average grant
- $25,625
- -92.0% vs 2024
- Median grant
- $20,000
- Total assets
- $1,751,409
- +6.7% vs 2024
- Primary geography
- Montana (98% 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 C Stone Foundation funds
How this funder distributes its grants
Top Recipients
Top 8 recipients in 2025
The largest 2025 recipient was Central Montana Medical Facilities Inc (dba Central Montana Medical Cent ($50K). Together the top 8 received $205K.
Grant Size Distribution
44 grants across all recorded years
The most common grant size was under $50K: 26 grants of 44 (59%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2025 grant dollars across all 8 itemized grants.
Cities
How C Stone Foundation gives
- Giving fell 35% from 2022 to 2025. Method
- In 2025 it paid out 123% 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 2020 to 2025, annual grant giving ranged from $205K (2025) to $2.2M (2024). In 2025 it made 8 grants totaling $205K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Central Montana Medical Facilities Inc (dba Central Montana Medical Cent Lewistown, MT | General Purpose | $50,000 |
| ExplorationWorks Inc Helena, MT | General Purpose | $50,000 |
| Rocky Mountain College Billings, MT | General Purpose | $50,000 |
| The Myrna Loy (Myrna Loy Center) Helena, MT | General Purpose | $30,000 |
| Montana History Foundation Inc Helena, MT | General Purpose | $10,000 |
| Kakenya's Dream Arlington, VA | General Purpose | $5,000 |
| Gods Love Inc (God's Love Homeless Shelter) Helena, MT | General Purpose | $5,000 |
| Max S Baucus Institute Bozeman, MT | General Purpose | $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 |
|---|---|---|---|---|---|---|---|---|
| 2025 | $1,751,409 | $372,969 | $262,739 | $205,000 | 8 | $205,000 | $366,699 | $167,005 |
| 2024 | $1,641,179 | $1,959,560 | $2,263,837 | $2,244,390 | 7 | $2,244,390 | $1,939,085 | $185,420 |
| 2023 | $2,756,028 | $10,123 | $301,260 | $275,000 | 10 | $275,000 | $21,500 | $233,751 |
| 2022 | $3,047,165 | $-10,528 | $337,826 | $315,000 | 11 | $315,000 | $27,553 | $240,756 |
| 2021 | $3,395,519 | $258,065 | $340,683 | $320,000 | 8 | $320,000 | $238,382 | $261,636 |
| 2020 | $3,478,120 | $145,547 | $293,630 | $270,000 | 8 | — | $121,917 | $225,570 |
Under IRS private-foundation payout rules, C Stone Foundation reported a distributable amount of $167K for 2025 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
C Stone Foundation's 2025 filing lists 3 officers; none of the 3 officers listed in 2025 report compensation.
Officers on the 2025 filing
Catherine S Campbell
Trustee
On filings since 2020
No compensation reported
Eloise D Austin
Trustee
On filings since 2020
No compensation reported
Ruth C Austin
Trustee
On filings since 2020
No compensation reported
Former officers (1)
- Former: Sara T Campbell (2020) — Trustee
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 C Stone Foundation
How much does C Stone Foundation give each year?
C Stone Foundation gave $205K across 8 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $2.2M across 7 grants.
What is C Stone Foundation's typical grant size?
C Stone Foundation's median grant in 2025 was $20,000, and its average grant was $25,625, across 8 grants on its 2025 IRS Form 990-PF.
Where does C Stone Foundation give grants?
C Stone Foundation gives mostly in Montana: 98% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The most frequent recipient cities were Helena, MT (4 grants).
Does C Stone Foundation give general operating support?
Yes: 100% of C Stone Foundation's 2025 grants with a stated purpose (8 of 8) were for general or operating support, per its 2025 IRS Form 990-PF.
Who are C Stone Foundation's largest grantees?
C Stone Foundation's largest 2025 grantees include Central Montana Medical Facilities Inc (dba Central Montana Medical Cent ($50,000), ExplorationWorks Inc ($50,000) and Rocky Mountain College ($50,000), according to its 2025 IRS Form 990-PF. Together they received 73% of its itemized 2025 grant dollars.
How large is C Stone Foundation?
C Stone Foundation reported $1.8M in total assets on its 2025 IRS Form 990-PF. It paid out $205K in qualifying distributions that year, against a required minimum of $167K (roughly 5% of its investment assets).
What is C Stone Foundation's EIN?
C Stone Foundation's EIN (Employer Identification Number) is 20-8134458. IRS Form 990 filing data is available on this page for 2020–2025.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Data update history
(2)
When this profile's IRS filing data changed on Grantable
- Added Form 990-PF for fiscal year 2025 (received by the IRS July 15, 2026)
- IRS filings on file for fiscal years 2020–2024
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