Onex to Host Annual Investor Day

TORONTO, ONTARIO--(Marketwire - June 4, 2012) -

All amounts in U.S. dollar unless otherwise stated

Onex (TSX:OCX) announced that it will host its annual Investor Day on June 7, 2012. The event will be webcast live beginning at 9:30 a.m. ET. Webcast participants will have the option to submit questions during the live event. A few days following the conclusion of the presentations, a replay will be available for 90 days. A link to the webcast and 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, real estate and credit securities. 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 its Funds.

Onex' businesses have assets of $42 billion, generate annual revenues of $36 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.