Tandem Philanthropies Fka the Ark Foundation
Invitation OnlyMenlo Park, California · EIN 38-4055324 · Private foundation
Grants paid (2024)$3.9M
Organizations funded11
Typical grant$350,000
Total assets$76.3M
Half of its grants to organizations were between $100,000 and $500,000.
From the return
How to apply
On its return for tax year 2024 the foundation checked the box saying it only makes contributions to preselected charitable organizations and does not accept unsolicited requests for funds.
What it funds
Share of grant lines on the latest return, classified from the purpose each grant states.
Where it gives
45% of grants went outside California.
Grants paid in tax year 2024
| Recipient | Location | Purpose | Amount |
|---|---|---|---|
| United States Energy Foundation | San Francisco, CA | To provide general support | $750,000 |
| Arizona State University Foundation | Tempe, AZ | To provide general support | $500,000 |
| Ceres | Boston, MA | To provide general support | $500,000 |
| Health Care Without Harm | Reston, VA | To provide general support | $500,000 |
| Silicon Schools Fund Inc | Oakland, CA | To provide general support | $500,000 |
| Educators for Excellence Inc | New York, NY | To provide general support | $350,000 |
| Transcend Inc | Hastings on Hudson, NY | To provide general support | $250,000 |
| Alder Graduate School of Education | Redwood City, CA | To provide general support | $200,000 |
| Bay Education Fund | Oakland, CA | To provide general support | $100,000 |
| Edvoice Institute | Sacramento, CA | To provide general support | $100,000 |
| New Schools Fund | Oakland, CA | To provide general support | $100,000 |
Giving by year
| Tax year | Grants paid | Grant lines |
|---|---|---|
| 2024 | $3,850,000 | 11 |
| 2023 | $2,750,800 | 8 |
Sources
- IRS Form 990-PF, tax year 2024, filed Nov 17, 2025 - IRS e-file batch, object ID 202533219349101883
- IRS Tax Exempt Organization Search for EIN 38-4055324
- Profile updated Nov 8, 2026
Facts on this page come from the foundation's own IRS Form 990-PF filings as published by the IRS. Grantvello does not know whether a foundation is accepting proposals right now: a past grant is not an open opportunity. Always confirm current guidelines with the funder before applying.