10 institutions reported holding $3.7M of CALAMOS (CBOY) in SEC 13F filings for 2026-06-30. Largest institutional holders: SUSQUEHANNA INTERNATIONAL GROUP, LLP ($1.2M), Calamos Advisors LLC ($584,674), ATX Financial Planning, LLC ($424,562), JANE STREET GROUP, LLC ($403,915), Markin Asset Management, LP ($358,804). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1.2M | 50,111 | Added |
| 2 | Calamos Advisors LLC | $584,674 | 23,874 | Trimmed |
| 3 | ATX Financial Planning, LLC | $424,562 | 17,336 | Trimmed |
| 4 | JANE STREET GROUP, LLC | $403,915 | 16,493 | Trimmed |
| 5 | Markin Asset Management, LP | $358,804 | 14,651 | Hold |
| 6 | Cambridge Investment Research Advisors, Inc. | $312,000 | 12,723 | Trimmed |
| 7 | Advus Financial Partners, LLC | $224,207 | 9,155 | New |
| 8 | HARBOUR INVESTMENTS, INC. | $162,712 | 6,644 | Hold |
| 9 | Ankerstar Wealth, LLC | $6,098 | 249 | Trimmed |
| 10 | UBS Group AG | $0 | 0 | Exited |
来源：SEC 13F 申报文件 · 截至 2026-06-30