5 institutions reported holding $97.7M of FLAGSTAR BANK NATIONAL ASSOC (NYCB-PA) in SEC 13F filings for 2026-06-30. Largest institutional holders: GROUP ONE TRADING LLC ($68.9M), IMC-Chicago, LLC ($16.4M), SIMPLEX TRADING, LLC ($12.4M), KELLEHER FINANCIAL ADVISORS ($0), Golden State Equity Partners ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GROUP ONE TRADING LLC | $68.9M | 4.6M | Trimmed |
| 2 | IMC-Chicago, LLC | $16.4M | 1.1M | Added |
| 3 | SIMPLEX TRADING, LLC | $12.4M | 832,400 | Trimmed |
| 4 | KELLEHER FINANCIAL ADVISORS | $0 | 0 | Exited |
| 5 | Golden State Equity Partners | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30