# Onex Partners Manager LP

> Onex Partners Manager LP is an SEC-registered investment advisory firm in Toronto, Canada, registered since 2012, reporting over $5 billion in regulatory assets under management in its Form ADV filing dated August 27, 2026.

- CRD: 160923
- Filed as: ONEX PARTNERS MANAGER LP
- Registration: SEC-registered investment adviser (status as filed: Approved)
- Location: Toronto, Canada
- Filing period: October 2026
- Form ADV filing dated: August 27, 2026
- SEC record (IAPD): https://adviserinfo.sec.gov/firm/summary/160923
- AdvisorCensus page: https://advisorcensus.com/firm/onex-partners-manager-lp-toronto-160923

## Quick answers

**How is Onex Partners Manager LP compensated?**
On its Form ADV (Item 5.E, October 2026), Onex Partners Manager LP reports these compensation arrangements: a percentage of assets under its management; performance-based fees. The amounts are in Item 5 of its Form ADV Part 2A brochure.

**Where is Onex Partners Manager LP located?**
Onex Partners Manager LP's principal office is in Toronto, Canada, according to its Form ADV; the September 2026 filing also lists 2 other offices (Schedule D, Section 1.F).

**Is Onex Partners Manager LP registered with the SEC or a state?**
Onex Partners Manager LP is an SEC-registered investment advisory firm, registered since 2012. Status as filed: Approved. CRD 160923.

**How much does Onex Partners Manager LP manage?**
Onex Partners Manager LP reports $22,473,000,000 in regulatory assets under management in its Form ADV filing dated August 27, 2026 (100% discretionary).

**How have Onex Partners Manager LP's assets and staff changed since 2021?**
In the Form ADV data for Onex Partners Manager LP: Regulatory assets under management: $17,644,000,000 in the October 2021 data and $22,473,000,000 in the October 2026 data, up 27%. Total employees: 245 in October 2021 and 180 in October 2026. Assets under management move with markets as well as with clients coming and going.

**What types of clients does Onex Partners Manager LP serve?**
By number of clients on Form ADV Item 5.D: pooled investment vehicles (other than investment companies and business development companies) (35).

**Does Onex Partners Manager LP report any disciplinary disclosures?**
Reports no disclosure items on Form ADV Item 11. The detail of any item is on the firm's SEC record: https://adviserinfo.sec.gov/firm/summary/160923

**What changed in Onex Partners Manager LP's recent Form ADV filings?**
In the June 2026 filing data: Updated its list of owners and control persons (Schedule A).

## From the Form ADV filing

### Compensation (Item 5.E)
- A percentage of assets under your management
- Performance-based fees

### Regulatory assets under management (Item 5.F)
- Total: $22,473,000,000
- Discretionary: $22,473,000,000
- Non-discretionary: $0

### Clients (Item 5.D)

| Client type | Clients | Assets |
| --- | --- | --- |
| Individuals (other than high net worth individuals) | 0 | $0 |
| High net worth individuals | 0 | $0 |
| Banking or thrift institutions | 0 | $0 |
| Investment companies | 0 | $0 |
| Business development companies | 0 | $0 |
| Pooled investment vehicles (other than investment companies and business development companies) | 35 | $22,473,000,000 |
| Pension and profit sharing plans (but not the plan participants or government pension plans) | 0 | $0 |
| Charitable organizations | 0 | $0 |
| State or municipal government entities (including government pension plans) | 0 | $0 |
| Other investment advisers | 0 | $0 |
| Insurance companies | 0 | $0 |
| Sovereign wealth funds and foreign official institutions | 0 | $0 |
| Corporations or other businesses not listed above | 0 | $0 |
| Other | 0 | $0 |

### Advisory services (Item 5.G)
- Portfolio management for pooled investment vehicles (other than investment companies)

### Firm details
- Registered since: 2012 (14 years)
- Employees: 180 total, 39 performing advisory functions
- Wrap fee program participation: No
- Disclosures (Item 11): Reports no disclosure items on Form ADV Item 11.

### Other offices (Schedule D, Section 1.F), as of the September 2026 filing
- London
- New York, NY

### Websites listed on Form ADV (Item 1.I)
- onex.com
- LinkedIn @onex

## Assets and staff over time

| Data period | Regulatory assets under management | Employees | Filing dated |
| --- | --- | --- | --- |
| October 2021 | $17,644,000,000 | 245 | March 31, 2021 |
| October 2022 | $19,645,000,000 | 278 | March 31, 2022 |
| October 2023 | $19,054,000,000 | 311 | March 31, 2023 |
| October 2024 | $20,860,000,000 | 257 | March 28, 2024 |
| October 2025 | $20,645,000,000 | 218 | March 28, 2025 |
| October 2026 | $22,473,000,000 | 180 | August 27, 2026 |

Regulatory assets under management: $17,644,000,000 in the October 2021 data and $22,473,000,000 in the October 2026 data, up 27%.
Total employees: 245 in October 2021 and 180 in October 2026.

## Changes in the filing (last 12 months)

### June 2026
- Updated its list of owners and control persons (Schedule A).

### April 2026
- Employees performing advisory functions went from 50 to 39.
- Updated its list of owners and control persons (Schedule A).

## Source

Form ADV as filed, October 2026. Values appear as filed. Cite as: AdvisorCensus. Onex Partners Manager LP (CRD 160923): Form ADV filing data as of October 2026.