5 institutions reported holding $37.8M of ZIONS BANCORPORATION NATL AS (ZIONW) in SEC 13F filings for 2026-06-30. Largest institutional holders: Optiver Holding B.V. ($14.4M), IMC-Chicago, LLC ($10.5M), SIMPLEX TRADING, LLC ($8.3M), GROUP ONE TRADING LLC ($4.6M), SG Americas Securities, LLC ($0). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Optiver Holding B.V. | $14.4M | 207,800 | Trimmed |
| 2 | IMC-Chicago, LLC | $10.5M | 152,100 | Trimmed |
| 3 | SIMPLEX TRADING, LLC | $8.3M | 119,400 | Added |
| 4 | GROUP ONE TRADING LLC | $4.6M | 66,500 | Added |
| 5 | SG Americas Securities, LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30