O'grady Human Resources & Management Consulting Inc.
O'hagan Design Services Inc.
O'Hara Technologies Inc.
O'hearn Transportation Inc.
O'jie Lifestyle Inc.
O'keefe Foundation
O'keefe Printing (ontario) Limited
O'lattes Inc.
O'leary Painting Company Ltd.
O'leary Resources Inc.
O'leary's Limited
O'Mahony Menton & Associates Inc.
O'mao Holdings Limited
O'neil Cabinets Corporation
O'neils Gourmet Foods Inc.
O'nique Limited
O'Phaelan Consulting ltd.
O'reilly Engineering Inc.
O'Rourke Marketing Corporation Ltd.
O'spuds Fish And Chip Shops Canada Inc.