Latest IRS filing: 2025 · Current application dates need confirmation.
Most reported giving: TX, VA
- Typical grant
- $1M
- Total giving
- $218.8M
- Grants reported
- 43
Foundation directoryO'Donnell Foundation Open Society Institute Otto Bremer Trust One8 Foundation The O Wayne Rollins Foundation C/O Rfa Management Co LLC Omidyar Network Fund Inc Oberndorf Family Foundation Orland Bethel Family Foundation Osteopathic Heritage Foundation The Oprah Winfrey Charitable Foundation Open Doors International Inc Oneroot Foundation The Otis Booth Foundation The Oak Foundation USA C/O Kemnay Advisory Services Inc The Orokawa Foundation Inc C/O Martin J Eby Once Upon A Time Foundation Onesight Essilorluxottica Foundation Fund Offutt Family Foundation October Mountain Foundation Inc O'Neill Family Charitable Trust The Overbrook Foundation The Oak Hill Fund Otto Schoitz Foundation Oakwood Foundation Charitable Trust
Foundations starting with O
160 private foundations with profiled giving history. Figures from IRS 990-PF filings.
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Typical grant is the median of grants reported in the filing data.
1–24 of 160 foundations in this list
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: NY, DC, CA
- Typical grant
- $15K
- Total giving
- $146.9M
- Grants reported
- 559
Latest IRS filing: 2025 · Current application dates need confirmation.
Most reported giving: MN, WI, ND
- Typical grant
- $55K
- Total giving
- $125.8M
- Grants reported
- 1,063
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: MA, NY, CA
- Typical grant
- $50K
- Total giving
- $48.8M
- Grants reported
- 188
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: GA, KY, FL
- Typical grant
- $2K
- Total giving
- $39.5M
- Grants reported
- 29
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: DC, NY, CA
- Typical grant
- $100K
- Total giving
- $38.1M
- Grants reported
- 242
Latest IRS filing: 2025 · Current application dates need confirmation.
Most reported giving: CA, TX, OH
- Typical grant
- $25K
- Total giving
- $36M
- Grants reported
- 112
Latest IRS filing: 2025 · Current application dates need confirmation.
Most reported giving: PA, NY, MA
- Typical grant
- $7.5K
- Total giving
- $27.8M
- Grants reported
- 10
Latest IRS filing: 2025 · Current application dates need confirmation.
Most reported giving: OH, MD, IL
- Typical grant
- $47.5K
- Total giving
- $24.5M
- Grants reported
- 129
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: CA, IL, MD
- Typical grant
- $150K
- Total giving
- $23.4M
- Grants reported
- 25
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: JOHANNESBURG, HARDERWIJK, QUEZON CITY
- Typical grant
- $611.7K
- Total giving
- $22.6M
- Grants reported
- 9
Latest IRS filing: 2025 · Current application dates need confirmation.
Most reported giving: CA, CO, NY
- Typical grant
- $25K
- Total giving
- $15.1M
- Grants reported
- 104
Latest IRS filing: 2023 · Current application dates need confirmation.
Most reported giving: CA, NY, ID
- Typical grant
- $25K
- Total giving
- $14.4M
- Grants reported
- 140
Latest IRS filing: 2025 · Current application dates need confirmation.
Most reported giving: HI, MA, NY
- Typical grant
- $400.8K
- Total giving
- $14.3M
- Grants reported
- 16
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: MD, NY, IL
- Typical grant
- $50K
- Total giving
- $11.1M
- Grants reported
- 115
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: TX, NC, DC
- Typical grant
- $350
- Total giving
- $10.7M
- Grants reported
- 1,039
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: GASABO, KIGALI CI, CHENNAI, JOHANNESBURG
- Typical grant
- $27.7K
- Total giving
- $10.3M
- Grants reported
- 79
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: MN, ND, NY
- Typical grant
- $5K
- Total giving
- $9.6M
- Grants reported
- 114
Latest IRS filing: 2025 · Current application dates need confirmation.
Most reported giving: NY, MI, MA
- Typical grant
- $30K
- Total giving
- $9.4M
- Grants reported
- 141
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: NY, VA, MA
- Typical grant
- $20K
- Total giving
- $8.5M
- Grants reported
- 149
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: NY, DC, CA
- Typical grant
- $47.5K
- Total giving
- $8.3M
- Grants reported
- 160
Latest IRS filing: 2025 · Current application dates need confirmation.
Most reported giving: VA, CO, FL
- Typical grant
- $25K
- Total giving
- $8M
- Grants reported
- 206
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: IA, MA
- Typical grant
- $25K
- Total giving
- $7.2M
- Grants reported
- 108
Latest IRS filing: 2024 · Current application dates need confirmation.
Most reported giving: VA, NC, DC
- Typical grant
- $10K
- Total giving
- $6.9M
- Grants reported
- 46
| Foundation | Typical grant | Total giving | Grants reported |
|---|---|---|---|
| O'Donnell Foundation IRS filing 2025 · Most giving: TX, VA | $1M | $218.8M | 43 |
| Open Society Institute IRS filing 2024 · Most giving: NY, DC, CA | $15K | $146.9M | 559 |
| Otto Bremer Trust IRS filing 2025 · Most giving: MN, WI, ND | $55K | $125.8M | 1,063 |
| One8 Foundation IRS filing 2024 · Most giving: MA, NY, CA | $50K | $48.8M | 188 |
| The O Wayne Rollins Foundation C/O Rfa Management Co LLC IRS filing 2024 · Most giving: GA, KY, FL | $2K | $39.5M | 29 |
| Omidyar Network Fund Inc IRS filing 2024 · Most giving: DC, NY, CA | $100K | $38.1M | 242 |
| Oberndorf Family Foundation IRS filing 2025 · Most giving: CA, TX, OH | $25K | $36M | 112 |
| Orland Bethel Family Foundation IRS filing 2025 · Most giving: PA, NY, MA | $7.5K | $27.8M | 10 |
| Osteopathic Heritage Foundation IRS filing 2025 · Most giving: OH, MD, IL | $47.5K | $24.5M | 129 |
| The Oprah Winfrey Charitable Foundation IRS filing 2024 · Most giving: CA, IL, MD | $150K | $23.4M | 25 |
| Open Doors International Inc IRS filing 2024 · Most giving: JOHANNESBURG, HARDERWIJK, QUEZON CITY | $611.7K | $22.6M | 9 |
| Oneroot Foundation IRS filing 2025 · Most giving: CA, CO, NY | $25K | $15.1M | 104 |
| The Otis Booth Foundation IRS filing 2023 · Most giving: CA, NY, ID | $25K | $14.4M | 140 |
| The Oak Foundation USA C/O Kemnay Advisory Services Inc IRS filing 2025 · Most giving: HI, MA, NY | $400.8K | $14.3M | 16 |
| The Orokawa Foundation Inc C/O Martin J Eby IRS filing 2024 · Most giving: MD, NY, IL | $50K | $11.1M | 115 |
| Once Upon A Time Foundation IRS filing 2024 · Most giving: TX, NC, DC | $350 | $10.7M | 1,039 |
| Onesight Essilorluxottica Foundation Fund IRS filing 2024 · Most giving: GASABO, KIGALI CI, CHENNAI, JOHANNESBURG | $27.7K | $10.3M | 79 |
| Offutt Family Foundation IRS filing 2024 · Most giving: MN, ND, NY | $5K | $9.6M | 114 |
| October Mountain Foundation Inc IRS filing 2025 · Most giving: NY, MI, MA | $30K | $9.4M | 141 |
| O'Neill Family Charitable Trust IRS filing 2024 · Most giving: NY, VA, MA | $20K | $8.5M | 149 |
| The Overbrook Foundation IRS filing 2024 · Most giving: NY, DC, CA | $47.5K | $8.3M | 160 |
| The Oak Hill Fund IRS filing 2025 · Most giving: VA, CO, FL | $25K | $8M | 206 |
| Otto Schoitz Foundation IRS filing 2024 · Most giving: IA, MA | $25K | $7.2M | 108 |
| Oakwood Foundation Charitable Trust IRS filing 2024 · Most giving: VA, NC, DC | $10K | $6.9M | 46 |
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