2 institutions reported holding $514,710 of COMPOSECURE INC (CMPOW) in SEC 13F filings for 2026-03-31. Largest institutional holders: SIMPLEX TRADING, LLC ($511,290), GROUP ONE TRADING LLC ($3,420). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $511,290 | 29,900 | Trimmed |
| 2 | GROUP ONE TRADING LLC | $3,420 | 200 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31