Onex Corporation to Announce Second Quarter Results on August 12, 2009

TORONTO, ONTARIO, Jul 30 (MARKET WIRE) --
All amounts in Canadian dollars unless otherwise stated

Onex Corporation (TSX: OCX) announced that it will release its results
for the second quarter and six months ended June 30, 2009 on August 12,
2009. A live broadcast of Onex Corporation's conference call to discuss
the results will begin at 4:30 pm EDT on August 12, 2009. A 90-day
on-line replay will be available following the conclusion of the live
broadcast. A link to the call and the replay can be found under the
Investor Information section of the company's website at www.onex.com and
is available in a listen-only mode.

About Onex

Onex is one of North America's oldest and most successful private equity
firms. Onex makes private equity investments through the Onex Partners
and ONCAP families of Funds. Onex also manages investment platforms
focused on real estate and credit securities. In total, the Company
manages approximately US$10 billion. Onex generates annual management fee
income and is entitled to a carried interest on approximately US$7
billion of third-party capital, and also invests its own capital directly
and as a substantial limited partner in its Funds.

Onex' businesses generate annual revenues of $33 billion, have assets of
$40 billion and employ 211,000 people worldwide. Onex shares trade on the
Toronto Stock Exchange under the stock symbol OCX. For more information
on Onex, visit its website www.onex.com. The Company's security filings
can also be accessed at www.sedar.com.

Contacts:
Onex Corporation
Michael G. Locke
Director, Investor Relations
416-362-7711
www.onex.com

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