3 institutions reported holding $808,772 of CULLEN FROST BANKERS INC (CFR-PA) in SEC 13F filings for 2026-03-31. Largest institutional holders: IMC-Chicago, LLC ($781,356), SIMPLEX TRADING, LLC ($27,416), GROUP ONE TRADING LLC ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $781,356 | 5,700 | New |
| 2 | SIMPLEX TRADING, LLC | $27,416 | 200 | New |
| 3 | GROUP ONE TRADING LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31