3 institutions reported holding $6.3M of MAIN STR CAP CORP (MSCA) in SEC 13F filings for 2026-06-30. Largest institutional holders: IMC-Chicago, LLC ($4.6M), SIMPLEX TRADING, LLC ($1.6M), GROUP ONE TRADING LLC ($202,332). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $4.6M | 88,000 | Added |
| 2 | SIMPLEX TRADING, LLC | $1.6M | 30,400 | Trimmed |
| 3 | GROUP ONE TRADING LLC | $202,332 | 3,900 | Trimmed |
来源：SEC 13F 申报文件 · 截至 2026-06-30