John P Calamos Sr Foundation
Grantmaking foundation in Naperville, Illinois · EIN 20-1383344
- Illinois
- Naperville
- Philanthropy, Voluntarism and Grantmaking Foundations
- Philanthropy, Voluntarism and Grantmaking Foundations in Illinois
- Grants itemized on the 990
- $1MTax year 2025
- Grants made
- 13Tax year 2025
- Total assets
- $57MLatest reported
- Latest IRS filing
- 2025Form 990 / 990-PF
Giving by year
Totals by tax year, rounded to two significant figures. Years without a reported total show the sum of grants itemized on the filing.
Top recipients
| Recipient | Amount | Tax year |
|---|---|---|
| National Hellenic Museum | $650K | 2025 |
| Assumption Greek Orthodox Church | $100K | 2025 |
| St Nicholas Greek Orthodox Church | $100K | 2025 |
| Hellenic Initiative Inc | $50K | 2025 |
| Washington Oxi Day Foundation | $50K | 2025 |
Amounts are rounded. The full grantee list (13 grants in 2025) is available with a free account.
Website: johnfoundation.org
See the full profile. All grants with amounts and years, board and officers, contact details, giving patterns and your organization's fit score are available with a free GrantAuthority account.
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Source: IRS Form 990 and 990-PF filings, tax year 2025. Also see this organization on ProPublica Nonprofit Explorer.