The Robert and Diane Weissman Foundation
The Robert and Diane Weissman Foundation is a private foundation focused on Philanthropy, Voluntarism & Grantmaking, based in LOS ALTOS, CA. IRS filing data is available from 2021 through 2025. As of 2025, the organization holds $1.7M in total assets. In 2025, it awarded 4 grants totaling $3K. Net investment income was $456K.
Financial Overview
From 2025 IRS Form 990-PF · View filing
Total Assets
$1.7M
+25.4% YoY
Annual Giving
$3K
-62.7% YoY
Grant Count
4
+33.3% YoY
Avg Grant Size
$700
-72.0% YoY
About The Robert and Diane Weissman Foundation
Based on IRS filings
The Robert and Diane Weissman Foundation is a private foundation focused on Philanthropy, Voluntarism & Grantmaking, based in LOS ALTOS, CA. IRS filing data is available from 2021 through 2025. As of 2025, the organization holds $1.7M in total assets. In 2025, it awarded 4 grants totaling $3K. Net investment income was $456K.
Focus Areas
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Geographic Focus
Where this funder awards grants
Grant Distribution by State
States
Cities
Financial History
Multi-year comparison from IRS filings
| Metric | 2025 | 2024 | 2023 |
|---|---|---|---|
| Total Assets | $1,737,656 | $1,385,195 | $1,413,357 |
| Revenue | $465,686 | $64,420 | $26,344 |
| Expenses | $113,227 | $92,581 | $75,237 |
| Qualifying Distributions | $103,128 | $87,455 | $66,370 |
| Net Investment Income | $455,587 | $59,294 | $17,526 |
| Distributable Amount | — | — | — |
Giving Over Time
Total grant dollars and number of grants per year
Grant Insights
How this funder distributes its grants
Top Recipients
Top 4 recipients in 2025
Grant Size Distribution
8 grants across all recorded years
Giving History
Grant recipients and amounts by year
Among its reported 2025 grants, the largest include tiger Mountain Foundation ($1,000), Daughters of Cambodia ($1,000), Golden Eagle Foundation ($750).
| Recipient | Purpose | Amount |
|---|---|---|
| Golden Eagle Foundation Fountain Hills, AZ | Support of programs to support classroom teachers | $750 |
| Courtneys Place Scottsdale, AZ | Support of programs | $50 |
| tiger Mountain Foundation Phoenix, AZ | Support of Community Garden | $1,000 |
| Daughters of Cambodia | Program support | $1,000 |
Leadership & Key People
Officers and directors from IRS filings
Compensation Overview
From 2025 IRS filing
From 2025 filing
| Name | Title | Hours | Compensation |
|---|---|---|---|
| Robert Weissman | President | 12 | — |
| Diane Weissman | Treasurer Secretary | 4 | — |
| Robert Weissman | Director | 12 | — |
| Diane Weissman | Director | 4 | — |
Subject Areas
Focus areas based on grantmaking activity
Frequently Asked Questions
What is The Robert and Diane Weissman Foundation?
The Robert and Diane Weissman Foundation is a private foundation focused on Philanthropy, Voluntarism & Grantmaking, based in LOS ALTOS, CA. It holds $1.7M in total assets as of 2025.
How large is The Robert and Diane Weissman Foundation?
As of 2025, The Robert and Diane Weissman Foundation holds $1.7M in total assets with $466K in annual revenue. It awarded 4 grants totaling $3K in 2025.
Where does The Robert and Diane Weissman Foundation operate?
The Robert and Diane Weissman Foundation has awarded grants in Arizona, California.
What size grants does The Robert and Diane Weissman Foundation award?
In 2025, The Robert and Diane Weissman Foundation awarded 4 grants totaling $3K — an average of about $700 per grant, based on its IRS Form 990 filings.
What is The Robert and Diane Weissman Foundation's EIN?
The Robert and Diane Weissman Foundation's EIN (Employer Identification Number) is 77-0560173. IRS Form 990 filing data is available on this page for 2021–2025.
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Data last updated April 2026. Sourced from IRS Form 990-PF filings.
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