Onex Corporation to Announce First-Quarter Results on May 11, 2011

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

All amounts in U.S. dollars unless otherwise stated

Onex Corporation (TSX:OCX) announced that it will release its results for the three months ended March 31, 2011 on May 11, 2011. A live broadcast of Onex' conference call to discuss the results will begin at 4:30 p.m. ET on May 11, 2011. A 90-day on-line replay will be available following the conclusion of the live broadcast.

Onex' Annual General Meeting of shareholders will be held on Thursday, May 12, 2011 at 10:00 a.m. ET at The Hazelton Hotel, Yorkville Room, 118 Yorkville Avenue, Toronto, Ontario.

A link to these events and their replays 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, real estate and credit securities. In total, the company manages approximately $14 billion, of which $10 billion is third-party capital. As well, Onex invests its own capital directly and as a substantial limited partner in its Funds.

Onex' businesses generate annual revenues of C$36 billion, have assets of C$42 billion and employ more than 238,000 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.