I dont think that they could hide the fact as per regulations below....
What you have to do when you become a 10% or greater shareholder depends on whether or not you are an eligible institutional investor. If you are, then unless you are disqualified,you are eligible to use Canada’s alternative monthly reporting system (AMR). You will have to file your initial AMR report with the Canadian securities regulators within 10 days of becoming a 10% shareholder.