---
title: "OHALLERAN MICHAEL D — Ownership Dossier"
canonical: https://whiteintel.dev/entity/7fbfd752-6417-57c8-9c10-3774551e9d85
json: https://whiteintel.dev/api/public/dossier/7fbfd752-6417-57c8-9c10-3774551e9d85
identifier: sec:0001023265
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# OHALLERAN MICHAEL D

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001023265`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/7fbfd752-6417-57c8-9c10-3774551e9d85  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/7fbfd752-6417-57c8-9c10-3774551e9d85  

## Ownership & control

### Holdings / subsidiaries

- **Aon plc** (officer) — https://whiteintel.dev/entity/7d82fcf4-534b-5951-ae0e-a5564e1020cf
- **RYAN SPECIALTY HOLDINGS, INC.** (director) — https://whiteintel.dev/entity/7c0097b7-7234-5396-bf57-cbcddf16cc8c
- **NUVASIVE INC** (director) — https://whiteintel.dev/entity/e70b41e0-3c84-5a41-bed1-c539fdf0927f
- **CAREFUSION CORP** (director) — https://whiteintel.dev/entity/f98a8613-8300-50fb-a06b-7d9eb5d6264e
- **CARDINAL HEALTH INC** (other) — https://whiteintel.dev/entity/f76741ec-df12-50e0-beba-d14a1f37c978
- **CARDINAL HEALTH INC** (director) — https://whiteintel.dev/entity/f76741ec-df12-50e0-beba-d14a1f37c978

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **OHALLERAN MICHAEL D**. Human view: https://whiteintel.dev/entity/7fbfd752-6417-57c8-9c10-3774551e9d85 · Structured JSON: https://whiteintel.dev/api/public/dossier/7fbfd752-6417-57c8-9c10-3774551e9d85._

_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"._