---
title: "Onex Partners VI B LP SEC filings"
url: https://altstreet.investments/edgar/2163262
kind: edgar-entity
updated: 2026-11-03
publisher: AltStreet (https://altstreet.investments)
license: Public factual pages may be read, quoted and cited with attribution and a link. Bulk redistribution is not permitted.
---

# Onex Partners VI B LP: SEC filings and what they report

Onex Partners VI B LP is a Delaware-organized pooled investment fund vehicle filed under Form D by Onex Partners, claiming Rule 506(b) and Section 3(c)(1) exemptions for a private offering of equity interests. The filing is pre-open with no disclosed total amount sold, investor count, or first sale date, consistent with an original (non-amended) filing for a fund still in formation. Related persons include executive officers tied to the Onex Partners VI B GP structure and Amir Motamedi as director, with Matthew Murphy listed as an executive officer/promoter.

| Field | Value |
| --- | --- |
| Entity | Onex Partners VI B LP |
| CIK | 2163262 |
| Filing family | 506(b), 3(c)(1) |
| Entity type | fund vehicle |
| Manager (as filed) | Onex Partners |
| Newest fact-bearing filing | November 2, 2026, accession 0002163262-26-000001 |
| Total sold (as reported) | $0 |
| Vintage | 2026 |

## Related persons (Form D Item 3)

| Name | Relationship |
| --- | --- |
| MATTHEW MURPHY | Executive Officer, Promoter |
| N/A ONEX PARTNERS VI B GP LP | Executive Officer |
| N/A ONEX PARTNERS VI B GP LLC | Executive Officer |
| N/A ONEX PARTNERS MANAGER LP | Executive Officer |
| AMIR MOTAMEDI | Director |


## More

- Entity page (HTML, with events, parties and the platform record): https://altstreet.investments/edgar/2163262
- SEC EDGAR filing index: https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0002163262&owner=include&count=40
- Signal history, evidence passages and the entity graph are AltStreet Terminal features: https://altstreet.investments/terminal

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Source page: https://altstreet.investments/edgar/2163262
Machine index: https://altstreet.investments/llms.txt
AltStreet reads what platforms, funds and issuers file with the SEC and what they tell investors, and publishes the difference. Figures are as filed or as captured on the date stated; nothing here is investment advice.