---
title: "TSONOS WILLIAM C — Ownership Dossier"
canonical: https://whiteintel.dev/entity/2fa52b93-3bad-5a93-9fdf-ce8c6ae1c2e2
json: https://whiteintel.dev/api/public/dossier/2fa52b93-3bad-5a93-9fdf-ce8c6ae1c2e2
identifier: sec:0001952114
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# TSONOS WILLIAM C

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001952114`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/2fa52b93-3bad-5a93-9fdf-ce8c6ae1c2e2  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/2fa52b93-3bad-5a93-9fdf-ce8c6ae1c2e2  

## Ownership & control

### Holdings / subsidiaries

- **BROOKLINE BANCORP INC** (officer) — https://whiteintel.dev/entity/576b8e74-5376-5d0f-8e07-c86c1760034d

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **TSONOS WILLIAM C**. Human view: https://whiteintel.dev/entity/2fa52b93-3bad-5a93-9fdf-ce8c6ae1c2e2 · Structured JSON: https://whiteintel.dev/api/public/dossier/2fa52b93-3bad-5a93-9fdf-ce8c6ae1c2e2._

_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"._