Onex to Announce First-Quarter Results on May 9, 2012

TORONTO, ONTARIO--(Marketwire - April 11, 2012) -

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, 2012 on May 9, 2012. A live broadcast of Onex' conference call to discuss the results will begin at 4:30 p.m. ET on May 9, 2012.

Onex' Annual General Meeting of shareholders will be held on Thursday, May 10, 2012 at 10:00 a.m. ET at The Hazelton Hotel, Yorkville Room, 118 Yorkville Avenue, Toronto, Ontario.

A link to these events and their 90-day on-line 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 $9 billion is third-party capital. As well, Onex invests its own capital directly and as a substantial limited partner in its Funds.

Onex' businesses have assets of $41 billion, generate annual revenues of $37 billion and employ approximately 246,000 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.