Sandbrook William J
SEC-identified person · CIK 1527678 Identifier-verified
Public-company roles (from insider filings)
| Company | Capacity as filed | Filings |
|---|---|---|
| Knife River Holding Co KNF | Director | filed 2023 - 2026 |
| Comfort Systems USA INC FIX | Director | filed 2018 - 2026 |
| Andretti Acquisition Corp. II POLE | Director · Executive Chairman | filed 2024 - 2024 |
| Zapata Quantum, Inc. ZPTA | Director · See Remarks | filed 2022 - 2024 |
| US Concrete INC USCR.OB | Director · Vice Chairman, President & CEO | filed 2011 - 2021 |
All roles under one Commission-assigned identifier - the same person by the SEC's own record, not by name matching. From the SEC's insider-transaction filings (Forms 3, 4 and 5). Every reporting director and officer carries a Commission-assigned identifier (CIK), so these footprints are identifier-verified - no name matching involved. Insiders file when they transact, so dates are filing dates: "last filed" never means "served until". This layer is not yet joined to the nonprofit register - identity joins ship only after independent review.