CHICAGO--(BUSINESS WIRE)--Fitch Ratings has assigned a final 'AAA' rating with Stable Outlook to the Bank of Montreal's (BMO; 'AA-'/Outlook Stable/'F1+') series CBL3 global registered covered bonds issued under its legislative program. The CBL3 bond has a par value of 325 million GBP and a three-year maturity with a 12-month extension. KEY RATING DRIVERS Rating Rationale: The 'AAA' rating on the series CBL3 issuance is based on BMO's long-term Issuer Default Rating (IDR) of 'AA-', an IDR uplift