The Globe and Mail reports in its Monday edition that top Bay Street executives are receiving notifications that their personal information may have been accessed during a recent data breach at Canada's investment industry regulator. The Globe's Clare O'Hara writes that on Tuesday, the Canadian Investment Regulatory Organization (CIRO) began sending out letters to its member firms and registered individuals to alert them that their personal data may have been breached on Aug. 11 when hackers targeted the self-regulatory organization. The list of those being notified not only includes financial advisers, but other roles that also require registration with CIRO, including executives, supervisors, traders or investors -- which could be someone who owns equity in a registered company. The various levels of registration mean some of the biggest names in Canada's financial services sector are among those at risk. They include executives at BMO, Scotiabank, CIBC, RBC and TD Bank. Many of the banks' senior level executives who work in capital markets, wealth management and investment brokerages are among those receiving CIRO letters. Several of Canada's independent wealth management firms are also registered with CIRO.