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Form 990-PFTax year 2025EIN 99-4031209

The Rhombus Foundation

A private foundation in Wilmington, DE. Its return for tax year 2025 lists 28 grants and $333,500 paid in grants.

See which foundations fund work like yours Matching by cause, place and grant size

Tax year 2025 (period ending Dec 31, 2025), read from the IRS e-file on Nov 11, 2026. Returns reach the IRS 5 to 18 months after the year they describe.

How to apply

Preselected only

The return checks the box saying the foundation gives only to preselected organizations and does not accept unsolicited requests.

Assets and giving by year

2 returns on file
Grants paid by tax year. The latest year is in blue.

  • Tax year 2025

    $333,500

    Grants listed
    28
    Assets, end of year
    $649,477

  • Tax year 2024

    $10,000

    Grants listed
    1
    Assets, end of year
    $980,261

Grants paid in 2025

28 grants, largest first

As listed on the return.

  1. St Vincents AcademyNewark, NJ

    General & Unrestricted

    $60,000
  2. Musical Dramatic Arts Foundation IncMarietta, GA

    General & Unrestricted

    $50,000
  3. Africa Research Excellence Fund (aref Africa)Fajara Banjul, The Gambia

    General & Unrestricted

    $40,000
  4. St Vincents AcademyNewark, NJ

    The Grace H. and Bernard A. Gay Scholarship fund

    $20,000
  5. Ebunjan Performing Arts AssociationSerekunda, The Gambia

    General & Unrestricted

    $15,000
  6. Try Association of Women Oyster SellersOld Jeshwang, The Gambia

    General & Unrestricted

    $12,000
  7. Atlas Economic Research Foundation - Atlas NetworkArlington, VA

    IMANI Africa

    $10,000
  8. Equal Justice InitiativeMontgomery, AL

    General & Unrestricted

    $10,000
  9. Hope for Haiti IncNaples, FL

    General & Unrestricted

    $10,000
  10. Human Rights Watch IncNew York, NY

    General & Unrestricted

    $10,000
  11. International Crisis GroupWashington, DC

    General & Unrestricted

    $10,000
  12. Medecins Sans Frontieres USA IncNew York, NY

    General & Unrestricted

    $10,000
  13. Panzi FoundationWashington, DC

    General & Unrestricted

    $10,000
  14. Sister to Sister of Montclair Mentoring Group IncMontclair, NJ

    College tours, workshops and CDBG

    $10,000
  15. Sister to Sister of Montclair Mentoring Group IncMontclair, NJ

    Mentor and Director stipends

    $10,000
  16. Sister to Sister of Montclair Mentoring Group IncMontclair, NJ

    General & Unrestricted

    $8,000
  17. Succeed 2GETHER IncMontclair, NJ

    General & Unrestricted

    $7,500
  18. International Rescue CommitteeNew York, NY

    To support the Committee's relief work

    $5,000
  19. KurandzaNovato, CA

    General & Unrestricted

    $5,000
  20. Mark Cares IncMontclair, NJ

    Kitchen project

    $5,000
  21. Better BurmaWoodland Park, CO

    General & Unrestricted

    $2,500
  22. Justice DefendersClaymont, DE

    General & Unrestricted

    $2,500
  23. Strategic MentoringGlen Ridge, NJ

    General & Unrestricted

    $2,500
  24. World Central Kitchen IncorporatedWashington, DC

    To support the organization's work in Jamaica

    $2,500
  25. Sister to Sister of Montclair Mentoring Group IncMontclair, NJ

    Nursing Scholarship Fund

    $2,000
  26. United Community CorporationNewark, NJ

    General & Unrestricted

    $2,000
  27. Mark Cares IncMontclair, NJ

    General & Unrestricted

    $1,000
  28. Start Out Fresh Intervention AdvocatesMontclair, NJ

    General & Unrestricted

    $1,000

Where the money goes

By cause: grants to organizations we matched to the IRS list of exempt organizations, by their category.

  1. International aid9 grants $57,50035% of the total
  2. Arts and culture1 grant $50,00030% of the total
  3. Human services6 grants $39,50024% of the total
  4. Civil rights1 grant $10,0006% of the total
  5. Community development2 grants $6,0004% of the total
  6. Youth development1 grant $2,5002% of the total
  7. 1 other causes1 grant $1,000<1% of the total

By State

Grants to organizations with a US address, latest year.

  1. New Jersey12 grants $129,000
  2. Georgia1 grant $50,000
  3. District of Columbia3 grants $22,500
  4. Alabama1 grant $10,000
  5. California2 grants $10,000
  6. Florida1 grant $10,000
  7. Maryland1 grant $10,000
  8. New York1 grant $10,000
  9. Virginia1 grant $10,000
  10. Colorado1 grant $2,500

Officers, directors and trustees

1 person as filed

As filed on the return, with average hours per week and pay from the foundation.

  • Omotunde AJ MahoneyResponsible Party, Pres, Dir, Hours 1Pay $0

The return

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