5 institutions reported holding $1.6M of CALAMOS ETF TR (CBOL) in SEC 13F filings for 2026-06-30. Largest institutional holders: CGN Advisors LLC ($525,169), ATX Financial Planning, LLC ($361,077), SUSQUEHANNA INTERNATIONAL GROUP, LLP ($313,547), JANE STREET GROUP, LLC ($285,930), Regatta Research & Money Management ($130,732). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | CGN Advisors LLC | $525,169 | 22,496 | Added |
| 2 | ATX Financial Planning, LLC | $361,077 | 15,467 | Added |
| 3 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $313,547 | 13,431 | Added |
| 4 | JANE STREET GROUP, LLC | $285,930 | 12,248 | Trimmed |
| 5 | Regatta Research & Money Management | $130,732 | 5,600 | New |
Source: SEC Form 13F filings · as of 2026-06-30