The 2017 annual report of Bank of Montreal contained the following excerpt in the "Independent Auditors' Report of Registered Public Accounting Firm." We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Bank's internal control over the financial reporting as at October 31, 2017, based on the criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated December 5, 2017, expressed an unmodified (unqualified) opinion on the effectiveness of the Bank's internal control over financial reporting. Why is this a requirement of a Canadian company? to now inspect The Dodd-Frank Act amended the Sarbanes-Oxley Act (SOX), granting the authority for the that practise in the US or have US clients. Since Bank of Montreal is a Canadian company listed on the New York stock exchange and has operations in the US, it these regulations