---
title: "GRUENBERG DON — Ownership Dossier"
canonical: https://whiteintel.dev/entity/877929a0-fd24-5125-8bb2-4dc6dfd5d7db
json: https://whiteintel.dev/api/public/dossier/877929a0-fd24-5125-8bb2-4dc6dfd5d7db
identifier: sec:0001244977
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# GRUENBERG DON

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001244977`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/877929a0-fd24-5125-8bb2-4dc6dfd5d7db  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/877929a0-fd24-5125-8bb2-4dc6dfd5d7db  

## Ownership & control

### Holdings / subsidiaries

- **Perma-Pipe International Holdings, Inc.** (officer) — https://whiteintel.dev/entity/a8ff8cd3-d66a-5811-a717-5da8152316fb

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **GRUENBERG DON**. Human view: https://whiteintel.dev/entity/877929a0-fd24-5125-8bb2-4dc6dfd5d7db · Structured JSON: https://whiteintel.dev/api/public/dossier/877929a0-fd24-5125-8bb2-4dc6dfd5d7db._

_Risk levels are heuristic investigative leads, not legal determinations of beneficial ownership. Every claim carries a source; an absent edge means "not yet observed in current sources", not "does not exist"._