Muriel F Siebert Foundation Inc
Invitation OnlySouthampton, New York · EIN 13-6266367 · Private foundation
Grants paid (2025)$2.3M
Organizations funded90
Typical grant$10,000
Total assets$43.5M
Half of its grants to organizations were between $10,000 and $20,000.
From the return
How to apply
On its return for tax year 2025 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
65% of grants went outside New York.
Grants paid in tax year 2025
| Recipient | Location | Purpose | Amount |
|---|---|---|---|
| Lewis Clark College | Portland, OR | General Support | $165,000 |
| Trustees of Columbia University | New York, NY | Department of Cardiology | $150,000 |
| Women's Forum of New York Inc | New York, NY | General Support | $150,000 |
| Texas AM San Antonio Foundation | San Antonio, TX | General Support | $70,000 |
| After-School All-Stars | Los Angeles, CA | General Support | $50,000 |
| New York-Presbyterian Fund Inc | New York, NY | Department of Cardiology | $50,000 |
| Champions Scholarship Fund | Malta, IL | General Support | $47,500 |
| Harper's Chapel Ministries | San Antonio, TX | General Support | $45,000 |
| San Antonio Little Theater Inc | San Antonio, TX | San Pedro Playhouse | $40,000 |
| Briscoe Western Art Museum | San Antonio, TX | General Support | $37,500 |
| University of New Hampshire Fdn | Durham, NH | General Support | $35,000 |
| Alamo Colleges Foundation | San Antonio, TX | General Support | $25,000 |
| Anti Defamation League | New York, NY | General Support | $25,000 |
| Ballet San Antonio | San Antonio, TX | General Support | $25,000 |
| Bexar County Family Justice Ctr Fdn | San Antonio, TX | General Support | $25,000 |
| COPS Metro Foundation | San Antonio, TX | General Support | $25,000 |
| NYC Outward Bound Center Inc | Long Island City, NY | General Support | $25,000 |
| Riverside Church in the City of NY | New York, NY | General Support | $25,000 |
| Schwarzman Animal Medical Center | New York, NY | General Support | $25,000 |
| Special Reach Inc | San Antonio, TX | General Support | $25,000 |
| Trustees of Columbia University | New York, NY | Colins Wagner Scholarship Fund | $25,000 |
| Classic Theatre of San Antonio | San Antonio, TX | General Support | $22,500 |
| Accion International | Washington, DC | General Support | $20,000 |
| All Star Orchestra Summit | Larchmont, NY | General Support | $20,000 |
| ForeBatten Foundation | Chapel Hill, NC | General Support | $20,000 |
| JA Worldwide Inc | Boston, MA | General Support | $20,000 |
| Roger's Memorial Library Foundation | Southampton, NY | General Support | $20,000 |
| The Leadership Foundation | Washington, DC | International Womens Forum | $20,000 |
| Hampton Bays Beautification Assn | Hampton Bays, NY | General Support | $15,000 |
| Network For Young Artists | San Antonio, TX | General Support | $15,000 |
| State of Texas Kidney Foundation | San Antonio, TX | General Support | $15,000 |
| The Economic Club of New York | New York, NY | General Support | $15,000 |
| As One Chicago Inc | Chicago, IL | General Support | $10,000 |
| Berkshire Taconic Community Fdn | Sheffield, MA | Helga S. Orthofer Memorial Fund | $10,000 |
| Catholic Charities of San Antonio | San Antonio, TX | General Support | $10,000 |
| Cisneros Scholars Program | San Antonio, TX | General Support | $10,000 |
| Fairplay Inc | Boston, MA | General Support | $10,000 |
| Girls Scouts of Southwest Texas | San Antonio, TX | General Support | $10,000 |
| Madonna Center | San Antonio, TX | General Support | $10,000 |
| Magik Theatre | San Antonio, TX | General Support | $10,000 |
| Metropolitan Museum of Art | New York, NY | General Support | $10,000 |
| Mind Science Foundation | San Antonio, TX | General Support | $10,000 |
| Monmouth University | West Long Branch, NJ | General Support | $10,000 |
| Music Center Foundation | Los Angeles, CA | General Support | $10,000 |
| Outward Bound Inc | Boulder, CO | General Support | $10,000 |
| Phelps Memorial Hospital Assn | Westbury, NY | General Support | $10,000 |
| Reflection Ministries of Texas Inc | Midland, TX | General Support | $10,000 |
| Rey Feo Scholarship Foundation | San Antonio, TX | General Support | $10,000 |
| SA Mexico Friendship Council Inc | San Antonio, TX | General Support | $10,000 |
| SA Women's Chamber of Commerce Fdn | San Antonio, TX | General Support | $10,000 |
| San Antonio After School All Stars | San Antonio, TX | General Support | $10,000 |
| San Antonio Museum of Art | San Antonio, TX | General Support | $10,000 |
| San Antonio Zoological Society | San Antonio, TX | General Support | $10,000 |
| Southampton Arts Center | Southampton, NY | General Support | $10,000 |
| Southampton Playhouse Inc | Southampton, NY | General Support | $10,000 |
| Southern Poverty Law Center Inc | Montgomery, AL | General Support | $10,000 |
| Stonewood Community Project Inc | Millbrook, NY | General Support | $10,000 |
| The Bowery Mission | New York, NY | General Support | $10,000 |
| The Trust for Public Land | San Francisco, CA | General Support | $10,000 |
| Tobin Center for Performing Arts | San Antonio, TX | General Support | $10,000 |
Showing the 60 largest of 90 grants to organizations.
The return also lists 36 grants to individuals ($494,900). We do not publish the names of individual recipients.
Giving by year
| Tax year | Grants paid | Grant lines |
|---|---|---|
| 2025 | $2,251,900 | 126 |
| 2024 | $1,212,695 | 102 |
| 2023 | $916,560 | 92 |
Sources
- IRS Form 990-PF, tax year 2025, filed May 12, 2026 - IRS e-file batch, object ID 202641329349100539
- IRS Tax Exempt Organization Search for EIN 13-6266367
- Profile updated Nov 5, 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.