6 institutions reported holding $41.3M of ZIONS BANCORPORATION NATL AS (ZIONW) in SEC 13F filings for 2026-03-31. Largest institutional holders: Optiver Holding B.V. ($24.3M), IMC-Chicago, LLC ($11.1M), SIMPLEX TRADING, LLC ($3.0M), GROUP ONE TRADING LLC ($2.9M), SG Americas Securities, LLC ($44,000). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Optiver Holding B.V. | $24.3M | 422,100 | Added |
| 2 | IMC-Chicago, LLC | $11.1M | 192,300 | Added |
| 3 | SIMPLEX TRADING, LLC | $3.0M | 52,000 | Trimmed |
| 4 | GROUP ONE TRADING LLC | $2.9M | 49,700 | Trimmed |
| 5 | SG Americas Securities, LLC | $44,000 | 58,200 | New |
| 6 | CenterStar Asset Management, LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31