---
title: "NEW MOUNTAIN PARTNERS II (AIV-B) L.P. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/5d37dff0-3f1e-5705-8daa-e8786eaa590b
json: https://whiteintel.dev/api/public/dossier/5d37dff0-3f1e-5705-8daa-e8786eaa590b
identifier: sec:0001631815
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# NEW MOUNTAIN PARTNERS II (AIV-B) L.P.

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001631815`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/5d37dff0-3f1e-5705-8daa-e8786eaa590b  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/5d37dff0-3f1e-5705-8daa-e8786eaa590b  

## Ownership & control

### Holdings / subsidiaries

- **BELLEROPHON THERAPEUTICS LLC** (tenpercentowner) — https://whiteintel.dev/entity/312fbbb3-d819-59dd-89ca-335115384f70

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **NEW MOUNTAIN PARTNERS II (AIV-B) L.P.**. Human view: https://whiteintel.dev/entity/5d37dff0-3f1e-5705-8daa-e8786eaa590b · Structured JSON: https://whiteintel.dev/api/public/dossier/5d37dff0-3f1e-5705-8daa-e8786eaa590b._

_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"._