Mark and Carolyn Guidry Foundation
The Mark and Carolyn Guidry Foundation is a private foundation based in Los Altos, California. Its 2025 filing reports grants to universities, schools, and children’s museums, including organizations in California and other states.
Mark and Carolyn Guidry Foundation at a glance
In short: Mark and Carolyn Guidry Foundation gave $609K across 12 grants in 2025 (avg $51K), mostly in California. 8% of 2025 grantees were new. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $609,000
- +13.2% vs 2024
- Grants made (2025)
- 12
- +20.0% vs 2024
- Average grant
- $50,750
- -5.7% vs 2024
- Median grant
- $10,000
- Total assets
- $2,329,806
- +8.4% vs 2024
- New grantees (estimate)
- 8% first-time grantees (1 of 12, 2025; small sample)
- Primary geography
- California (96% 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 Mark and Carolyn Guidry Foundation
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation does not accept unsolicited requests for funds and makes contributions only to preselected charitable organizations.
- Contact
Mailing address: 44 Marvin Avenue, Los Altos, CA 94022
Phone: (650) 823-7768
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who Mark and Carolyn Guidry Foundation funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2025
The largest 2025 recipient was Sierra Nevada Children's Museum ($400K). Together the top 10 received $604K.
Grant Size Distribution
63 grants across all recorded years
The most common grant size was under $50K: 54 grants of 63 (86%).
Geographic Focus
Where this funder awards grants
The foundation’s 2025 filing reports grant dollars going primarily to California recipients: 96% of the total. It also reports shares for Iowa (2%), Washington (2%), and Louisiana (1%); the listed percentages total more than 100%.
Grant Distribution by State
Share of 2025 grant dollars across all 12 itemized grants.
Cities
Is Mark and Carolyn Guidry Foundation open to new grantees?
8%
first-time grantees, 2025
In 2025, 1 of 12 grantees (8%) were first-time recipients. With only 12 grantees, that is a small sample: one grantee more or less moves the share by about 8 points. First grants averaged $6K; repeat grants $55K. How we count
Medians: $6K first-time, $10K repeat.
- 83% of 2025 grantees were also funded in 2024. Method
- In 2025 it paid out 245% of its IRS minimum distribution (the 5% rule). Method
Estimate from itemized grant lists in IRS Form 990-PF filings (2020–2025). 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 2020 to 2025, annual grant giving ranged from $211K (2020) to $609K (2025). In 2025 it made 12 grants totaling $609K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Sierra Nevada Children's Museum Truckee, CA | Charitable Grant | $400,000 |
| San Jose State University San Jose, CA | Charitbale Grant | $75,000 |
| Chico State University Chico, CA | Charitable Grant | $40,000 |
| Raft San Jose, CA | Charitable Grant | $30,000 |
| Cal Poly San Luis Obispo San Luis Obispo, CA | Charitable Grant | $25,000 |
| Iowa State University Ames, IA | Charitable Grant | $10,000 |
| University of Washington Seattle, WA | Charitable Grant | $10,000 |
| California State University Long Beach Long Beach, CA | Charitable Grant | $6,000 |
| Lafourche Parish Schools Thibodaux, LA | Charitable Grant | $5,000 |
| Bitterwater Tully School King City, CA | Charitable Grant | $3,000 |
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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 | $2,329,806 | $794,636 | $613,479 | $609,000 | 12 | $610,357 | $794,297 | $249,354 |
| 2024 | $2,148,649 | $648,271 | $546,243 | $538,000 | 10 | $539,040 | $648,011 | $275,516 |
| 2023 | $2,046,721 | $459,487 | $562,161 | $553,000 | 11 | $554,767 | $457,717 | $234,403 |
| 2021 | $2,367,368 | $307,589 | $259,466 | $255,807 | 16 | $255,807 | $307,411 | $285,519 |
| 2020 | $2,329,063 | $156,160 | $226,107 | $211,000 | 14 | — | $146,661 | $224,945 |
Under IRS private-foundation payout rules, Mark and Carolyn Guidry Foundation reported a distributable amount of $249K for 2025 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated October 2026.
Mission & Focus Areas
No mission statement for the foundation is provided. Its 2025 grants show support for universities, schools, and children’s museums. Sierra Nevada Children’s Museum describes its mission as inspiring learning through creative play and discovery. Children’s Discovery Museum describes its mission as helping children and families learn through hands-on exhibits and programs that engage curiosity and creativity.
Grantmaking
In filing year 2025, the foundation reported 12 grants totaling $609,000. Grants ranged from $2,000 to $400,000, with a median of $10,000. The largest grants included $400,000 to Sierra Nevada Children’s Museum, $75,000 to San Jose State University, $40,000 to Chico State University, $30,000 to RAFT, and $25,000 to Cal Poly San Luis Obispo.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists Gayle G Dilley as president and secretary, David Guidry as treasurer, and Mike Guidry as vice president.
Mark and Carolyn Guidry Foundation is led by Gayle G. Dilley, President & Secretary since 2023 (on filings since 2020); none of the 3 officers listed in 2025 report compensation.
Officers on the 2025 filing
Gayle G. Dilley
President & Secretary
President → President & Secretary, 2023
On filings since 2020
1 hr/week
No compensation reported
David Guidry
Treasurer
On filings since 2023
1 hr/week
No compensation reported
Mike Guidry
Vice President
On filings since 2023
1 hr/week
No compensation reported
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 Carolyn Guidry Foundation
How much does Mark and Carolyn Guidry Foundation give each year?
Mark and Carolyn Guidry Foundation gave $609K across 12 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $538K across 10 grants.
What is Mark and Carolyn Guidry Foundation's typical grant size?
Mark and Carolyn Guidry Foundation's median grant in 2025 was $10,000, and its average grant was $50,750, across 12 grants on its 2025 IRS Form 990-PF. Organizations receiving their first grant from Mark and Carolyn Guidry Foundation that year got $6K on average.
Where does Mark and Carolyn Guidry Foundation give grants?
Mark and Carolyn Guidry Foundation gives mostly in California: 96% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The most frequent recipient cities were San Jose, CA (3 grants) and King City, CA (2 grants).
Does Mark and Carolyn Guidry Foundation give general operating support?
Not in 2025: none of the 12 grants with a stated purpose on Mark and Carolyn Guidry Foundation's 2025 IRS Form 990-PF were described as general or operating support. Recurring purposes include "Charitable Grant" (11 grants).
Who are Mark and Carolyn Guidry Foundation's largest grantees?
Mark and Carolyn Guidry Foundation's largest 2025 grantees include Sierra Nevada Children's Museum ($400,000), San Jose State University ($75,000) and Chico State University ($40,000), according to its 2025 IRS Form 990-PF. Together they received 85% of its itemized 2025 grant dollars.
How large is Mark and Carolyn Guidry Foundation?
Mark and Carolyn Guidry Foundation reported $2.3M in total assets on its 2025 IRS Form 990-PF. It paid out $610K in qualifying distributions that year, against a required minimum of $249K (roughly 5% of its investment assets).
What does Mark and Carolyn Guidry Foundation fund?
No mission statement for the foundation is provided. Its 2025 grants show support for universities, schools, and children’s museums. Sierra Nevada Children’s Museum describes its mission as inspiring learning through creative play and discovery. See mission & focus areas ↑
How do I apply for a grant from Mark and Carolyn Guidry Foundation?
The foundation does not accept unsolicited requests for funds and makes contributions only to preselected charitable organizations. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is Mark and Carolyn Guidry Foundation's EIN?
Mark and Carolyn Guidry Foundation's EIN (Employer Identification Number) is 94-3185161. IRS Form 990 filing data is available on this page for 2020–2025.
Does Mark and Carolyn Guidry Foundation accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated October 2026.
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 August 27, 2026)
- IRS filings on file for fiscal years 2020–2024
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Cite this profile
Grantable. (2026). Mark and Carolyn Guidry Foundation funder profile. GrantGraph. Retrieved October 11, 2026, from https://grantable.co/funders/mark-and-carolyn-guidry-foundation-morg_51b5bceb990f4859a48d63c75dc55986
BibTeX
@misc{grantable_943185161_2026,
author = {{Grantable}},
title = {{Mark and Carolyn Guidry Foundation funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/mark-and-carolyn-guidry-foundation-morg_51b5bceb990f4859a48d63c75dc55986},
note = {Accessed 2026-10-11. Data licensed CC BY 4.0}
}The figures on this page are open data under CC BY 4.0: reuse them with credit to Grantable and a link. Download the data.
Figures come from Mark and Carolyn Guidry Foundation's IRS filings (methodology). AI-written summaries, news items and logos are not covered by the open licence. Spot an error? Email hello@grantable.co.
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