1 institutions reported holding $35,438 of GATX CORP (GMTA) in SEC 13F filings for 2026-06-30. Largest institutional holders: SIMPLEX TRADING, LLC ($35,438). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $35,438 | 200 | Trimmed |
Source: SEC Form 13F filings · as of 2026-06-30