Provisional. Ranked October 7, 2026 from the filings the IRS had published by then. Organizations have up to 10½ months after their year ends to file, so the list will change as the rest arrive.
| Rank | National | Organization | Growth | Revenue |
|---|---|---|---|---|
| 1 | 321 | Museum Alliance of Rapid City INC Rapid City, SD · Arts and culture | 528% | $662K → $4.2M |
| 2 | 420 | Wambli Ska Society Rapid City, SD · Arts and culture | 437% | $685K → $3.7M |
| 3 | 428 | The Lakota Fund Incorporated Kyle, SD · Community improvement | 424% | $1.6M → $8.3M |