---
title: "PORTER MICHAEL E — Ownership Dossier"
canonical: https://whiteintel.dev/entity/27536e41-d3fc-5a2e-b3fb-292f73695c38
json: https://whiteintel.dev/api/public/dossier/27536e41-d3fc-5a2e-b3fb-292f73695c38
identifier: sec:0001108494
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# PORTER MICHAEL E

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001108494`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/27536e41-d3fc-5a2e-b3fb-292f73695c38  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/27536e41-d3fc-5a2e-b3fb-292f73695c38  

## Ownership & control

### Holdings / subsidiaries

- **PTC INC.** (director) — https://whiteintel.dev/entity/5dd099f5-3f5f-5d73-b582-8539e100f3be
- **MERRIMACK PHARMACEUTICALS INC** (director) — https://whiteintel.dev/entity/4d45c6ce-b63c-5b85-b216-6bbbb5f8a83b
- **SCOTTS MIRACLE-GRO CO** (director) — https://whiteintel.dev/entity/458165e2-283f-56a1-a985-f7a4fa3fbf9c
- **THERMO FISHER SCIENTIFIC INC.** (director) — https://whiteintel.dev/entity/ccfdd37f-d6b8-5bb6-a381-c9ed8c362994

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **PORTER MICHAEL E**. Human view: https://whiteintel.dev/entity/27536e41-d3fc-5a2e-b3fb-292f73695c38 · Structured JSON: https://whiteintel.dev/api/public/dossier/27536e41-d3fc-5a2e-b3fb-292f73695c38._

_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"._