---
title: "STEINHARDT JOHN — Ownership Dossier"
canonical: https://whiteintel.dev/entity/06fef076-475e-5168-816c-e9b30bcabefc
json: https://whiteintel.dev/api/public/dossier/06fef076-475e-5168-816c-e9b30bcabefc
identifier: sec:0001296971
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# STEINHARDT JOHN

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001296971`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/06fef076-475e-5168-816c-e9b30bcabefc  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/06fef076-475e-5168-816c-e9b30bcabefc  

## Ownership & control

### Holdings / subsidiaries

- **MARKETAXESS HOLDINGS INC** (director) — https://whiteintel.dev/entity/cf5476e6-7e0f-51de-9545-b9a37df80887

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **STEINHARDT JOHN**. Human view: https://whiteintel.dev/entity/06fef076-475e-5168-816c-e9b30bcabefc · Structured JSON: https://whiteintel.dev/api/public/dossier/06fef076-475e-5168-816c-e9b30bcabefc._

_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"._