Tidemark 10 Foundation
Tidemark 10 Foundation is a private foundation based in Wilmington, Delaware. Its 2025 filing reports $1,396,970 in grants to 16 organizations, including support for the Center for Ocean Solutions at Stanford University and grants designated for Los Angeles wildfire relief.
Tidemark 10 Foundation at a glance
In short: Tidemark 10 Foundation gave $1.4M across 16 grants in 2025 (avg $87K), mostly in California. Source: 2025 IRS Form 990-PF.
- Annual giving (2025)
- $1,396,970
- +16005.3% vs 2024
- Grants made (2025)
- 16
- +700.0% vs 2024
- Average grant
- $87,311
- +1913.2% vs 2024
- Median grant
- $7,860
- Total assets
- $9,377,937
- +20.5% vs 2024
- Primary geography
- California (73% of itemized 2025 grant dollars)
- Latest 990 filing
- Form 990-PF, 2025 View filing
Data from IRS Form 990-PF, 2025; updated October 2026.
How to apply to Tidemark 10 Foundation
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation states that it makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds.
- Contact
Mailing address: Foundation Source 501 Silverside Rd, Wilmington, DE 19809-1377
Phone: (800) 839-1754
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who Tidemark 10 Foundation funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2025
The largest 2025 recipient was Stanford University ($1.0M). Together the top 10 received $1.4M.
Grant Size Distribution
21 grants across all recorded years
The most common grant size was under $50K: 18 grants of 21 (86%).
Geographic Focus
Where this funder awards grants
In 2025, 73% of grant dollars went to recipients in California and 22% to recipients in Massachusetts. The remaining grant dollars went to recipients in Virginia (2%), the District of Columbia (1%), and New York (1%).
Grant Distribution by State
Share of 2025 grant dollars across all 16 itemized grants.
States
Cities
How Tidemark 10 Foundation gives
- Giving grew 3349% from 2022 to 2025. Method
- In 2025 it paid out 340% 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 2025, annual grant giving ranged from $9K (2024) to $1.4M (2025). In 2025 it made 16 grants totaling $1.4M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Stanford University Stanford, CA | For the Center for Ocean Solutions | $1,000,000 |
| Fidelity Investments Charitable Gift Fund Boston, MA | General & Unrestricted | $300,000 |
| Nature Conservancy Arlington, VA | California Oceans Program | $20,000 |
| Carnegie Endowment for International Peace Washington, DC | General & Unrestricted | $10,000 |
| Kqed Inc San Francisco, CA | General & Unrestricted | $10,000 |
| Natural Resources Defense Council Inc New York, NY | General & Unrestricted | $10,000 |
| PBS Foundation Arlington, VA | General & Unrestricted | $10,000 |
| Refed Inc Chicago, IL | General & Unrestricted | $10,000 |
| Sustainable Surf Manhattan BCH, CA | General & Unrestricted | $5,720 |
| Los Angeles Fire Department Foundation Los Angeles, CA | LA Wildfire Relief | $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 | $9,377,937 | $3,054,106 | $1,458,189 | $1,396,970 | 16 | $1,429,854 | $9,017,367 | $420,976 |
| 2024 | $7,782,020 | $6,297,278 | $24,450 | $8,674 | 2 | $23,550 | $11,678 | $214,684 |
| 2023 | $1,509,192 | $63,202 | $1,014,571 | $1,000,000 | 1 | $1,014,371 | $63,202 | $106,629 |
| 2022 | $2,460,561 | $-9,054 | $55,893 | $40,500 | 2 | $55,886 | $13,943 | $102,575 |
| 2021 | $2,525,508 | $1,536,912 | $52,045 | — | — | $17,045 | $2,518,494 | $68,258 |
| 2020 | $1,040,641 | $1,040,641 | — | — | — | — | — | $3,023 |
Under IRS private-foundation payout rules, Tidemark 10 Foundation reported a distributable amount of $421K for 2025 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement for the foundation is provided. Its 2025 grants include a $1,000,000 grant to Stanford University for the Center for Ocean Solutions and a $20,000 grant to The Nature Conservancy for its California Oceans Program. Other grants included support for public media, food-waste reduction, international peace, and wildfire relief.
Grantee descriptions illustrate the range of organizations supported. Sustainable Surf describes its mission as protecting and restoring blue-carbon ecosystems and creating educational stories to inspire action. ReFED says it catalyzes evidence-based action to stop food waste. KQED describes serving Northern California through community-supported media, education, and arts programming. These are the grantees’ stated missions, not statements of the foundation’s own mission.
Grantmaking
In 2025, the foundation reported 16 grants totaling $1,396,970. Grant amounts ranged from $1,000 to $1,000,000, with a median grant of $7,860.
The largest grants included $1,000,000 to Stanford University for the Center for Ocean Solutions and $300,000 to Fidelity Investments Charitable Gift Fund for general and unrestricted purposes. Other reported grants included $20,000 to The Nature Conservancy for its California Oceans Program; $10,000 each to Carnegie Endowment for International Peace, KQED, Natural Resources Defense Council, PBS Foundation, and ReFED; and $5,720 to Sustainable Surf. The Los Angeles Fire Department Foundation and World Central Kitchen each received $5,000 for Los Angeles wildfire relief.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2025 filing lists David Li Yuan as director and Grace Yuan as director, president, secretary, and treasurer.
Tidemark 10 Foundation is led by Grace Yuan, Director, President, Secretary & Treasurer on every filing since 2020; none of the 2 officers listed in 2025 report compensation.
Officers on the 2025 filing
Grace Yuan
Director, President, Secretary & Treasurer
On filings since 2020
5 hrs/week
No compensation reported
David Li Yuan
Director
On filings since 2021
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 Tidemark 10 Foundation
How much does Tidemark 10 Foundation give each year?
Tidemark 10 Foundation gave $1.4M across 16 grants in 2025, according to its 2025 IRS Form 990-PF. In 2024 it gave $9K across 2 grants.
What is Tidemark 10 Foundation's typical grant size?
Tidemark 10 Foundation's median grant in 2025 was $7,860, and its average grant was $87,311, across 16 grants on its 2025 IRS Form 990-PF.
Where does Tidemark 10 Foundation give grants?
Tidemark 10 Foundation gives mostly in California: 73% of the grant dollars itemized on its 2025 IRS Form 990-PF went to recipients there. The next largest state was Massachusetts (22%). The most frequent recipient cities were Boston, MA (2 grants), Arlington, VA (2 grants), Washington, DC (2 grants) and San Francisco, CA (2 grants).
Does Tidemark 10 Foundation give general operating support?
Yes: 69% of Tidemark 10 Foundation's 2025 grants with a stated purpose (11 of 16) were for general or operating support, per its 2025 IRS Form 990-PF. Recurring purposes include "LA Wildfire Relief" (3 grants).
Who are Tidemark 10 Foundation's largest grantees?
Tidemark 10 Foundation's largest 2025 grantees include Stanford University ($1,000,000), Fidelity Investments Charitable Gift Fund ($300,000) and Nature Conservancy ($20,000), according to its 2025 IRS Form 990-PF. Together they received 94% of its itemized 2025 grant dollars.
How large is Tidemark 10 Foundation?
Tidemark 10 Foundation reported $9.4M in total assets on its 2025 IRS Form 990-PF. It paid out $1.4M in qualifying distributions that year, against a required minimum of $421K (roughly 5% of its investment assets).
What does Tidemark 10 Foundation fund?
No mission statement for the foundation is provided. Its 2025 grants include a $1,000,000 grant to Stanford University for the Center for Ocean Solutions and a $20,000 grant to The Nature Conservancy for its California Oceans Program. See mission & focus areas ↑
How do I apply for a grant from Tidemark 10 Foundation?
The foundation states that it makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is Tidemark 10 Foundation's EIN?
Tidemark 10 Foundation's EIN (Employer Identification Number) is 85-4039046. IRS Form 990 filing data is available on this page for 2020–2025.
Does Tidemark 10 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 September 2026.
Data update history
(6)
When this profile's IRS filing data changed on Grantable
- Updated Form 990-PF for fiscal year 2020 (received by the IRS March 22, 2022)
- Updated Form 990-PF for fiscal year 2021 (received by the IRS May 19, 2022)
- Updated Form 990-PF for fiscal year 2022 (received by the IRS November 13, 2023)
- Updated Form 990-PF for fiscal year 2023 (received by the IRS August 29, 2024)
- Updated Form 990-PF for fiscal year 2024 (received by the IRS May 9, 2025)
- Added Form 990-PF for fiscal year 2025 (received by the IRS May 1, 2026)
Live grants for the work Tidemark 10 Foundation funds
Philanthropy, Voluntarism & Grantmaking Open opportunities, soonest deadline first.
Explore Open Grants
Browse active grant opportunities in Tidemark 10 Foundation's focus areas in our free grants database
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Cite this profile
Grantable. (2026). Tidemark 10 Foundation funder profile. GrantGraph. Retrieved October 16, 2026, from https://grantable.co/funders/tidemark-10-foundation-morg_586a0981d8ea4802b147f06ee962fc1d
BibTeX
@misc{grantable_854039046_2026,
author = {{Grantable}},
title = {{Tidemark 10 Foundation funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/tidemark-10-foundation-morg_586a0981d8ea4802b147f06ee962fc1d},
note = {Accessed 2026-10-16. 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 Tidemark 10 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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