Onex Corporation to Announce Second-Quarter Results on August 10, 2011

TORONTO, ONTARIO--(Marketwire - July 20, 2011) -

All amounts in U.S. 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, 2011 on August 10, 2011. A live broadcast of Onex' conference call to discuss the results will begin at 4:30 p.m. ET on August 10, 2011. A 90-day on-line replay will be available following the conclusion of the live broadcast. A link to the call and the replay will be available under the Investor Information section of Onex' website at www.onex.com.

About Onex

Onex is one of North America's oldest and most successful investment firms committed to acquiring and building high-quality businesses in partnership with talented management teams. Onex manages investment platforms focused on private equity, credit securities and real estate. In total, the company manages approximately $15 billion, of which $10 billion is third-party capital. As well, Onex invests its own capital directly and as a substantial limited partner in each of its Funds.

Onex' businesses generate annual revenues of $35 billion, have assets of $39 billion and employ approximately 210,000 people worldwide. Onex shares trade on the Toronto Stock Exchange under the stock symbol OCX. For more information on Onex, visit its website at www.onex.com. The Company's security filings can also be accessed at www.sedar.com.