ONEX PARTNERS MANAGER LP
ONEX PARTNERS MANAGER LP is a Series C+, buyout and debt fund in the US and Europe writing $200M–$750M checks into Fintech, aerospace-aviation, business-services and packaging-industrials.
- Stages
- Series C+, buyout, debt
- Sectors
- Fintech, aerospace-aviation, business-services, packaging-industrials
- Check size
- $200M–$750M
- Invests in
- US-wide, Europe
- Round role
- Leads rounds
- Actively investing
- Yes
- Founded
- 1984
- Assets under management
- $24B
- Website
- onex.com
Thesis
Onex Partners Manager LP is a private equity firm established in 1984, with headquarters in Toronto, Canada, and offices in New York and London. The firm focuses on upper-middle-market buyout strategies, making control equity investments in North America and Europe. They target businesses with an EBITDA greater than $30 million and specialize in the Aerospace & Aviation, Business Services, Financial Services, and Packaging & Industrials sectors. Their investment approach involves active partnership with management teams to drive long-term value through operational execution and strategic growth. Onex Partners is known for handling complex transactions, including corporate carve-outs and divisions, and employs a value-oriented acquisition strategy with a focus on downside protection and credit selection in direct lending. As of May 15, 2026, the firm reported approximately $22.47 billion in Assets Under Management (AUM). For its Onex Partners platform, the typical transaction size requires between $200 million to $750 million of equity. The firm manages a significant number of private funds, ranging from 21 to 48.
Common questions
Does ONEX PARTNERS MANAGER LP invest at the Series C+ stage?
Yes. ONEX PARTNERS MANAGER LP lists Series C+, buyout and debt among the stages it invests in.
What check size does ONEX PARTNERS MANAGER LP write?
ONEX PARTNERS MANAGER LP writes $200M–$750M checks.
Where does ONEX PARTNERS MANAGER LP invest?
ONEX PARTNERS MANAGER LP invests in the US and Europe.