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Significant Subsidiaries (Tables)
12 Months Ended
Oct. 31, 2025
Text Block [Abstract]  
Summary of Significant Operating Subsidiaries
As at October 31, 2025, the bank, either directly or indirectly through its subsidiaries, controls the following significant operating subsidiaries.
 
Significant subsidiaries (1) (2)   Head or principal office      Book value of shares owned by the
bank (Canadian $ in millions)
 
AIR MILES Loyalty Inc.
    Toronto, Canada        $             19  
Bank of Montreal (China) Co. Ltd.
    Beijing, China        497  
Bank of Montreal Europe Public Limited Company
    Dublin, Ireland        1,391  
Bank of Montreal Holding Inc. and subsidiaries, including:
    Toronto, Canada        35,455  
Bank of Montreal Mortgage Corporation
    Calgary, Canada     
BMO Mortgage Corp.
    Vancouver, Canada     
BMO Investments Inc.
    Toronto, Canada     
BMO InvestorLine Inc.
   
Toronto, Canad
a
    
BMO Nesbitt Burns Inc.
    Toronto, Canada     
BMO Private Investment Counsel Inc.
    Toronto, Canada     
 
 
 
BMO Private Equity (Canada) Inc.
    Toronto, Canada     
BMO Capital Markets Limited
    London, England        434  
BMO Capital Partners Inc.
    Toronto, Canada        1,067  
BMO Financial Corp. and subsidiaries, including:
    Chicago, United States        60,146  
BMO Bank National Association
    Chicago, United States     
BMO Capital Markets Corp.
    New York, United States     
BMO Japan Securities Ltd.
    Tokyo, Japan        6  
BMO Life Insurance Company and subsidiary
    Toronto, Canada        1,430  
BMO Life Assurance Company
    Toronto, Canada     
BMO Trust Company
    Toronto, Canada        630  
 
  (1)
Each subsidiary is incorporated or organized under the laws of the state or country in which the principal office is situated, except for BMO Financial Corp. and BMO Capital Markets Corp., which are incorporated under the laws of the state of Delaware, United States.
  (2)
Unless otherwise noted, the bank, either directly or indirectly through its subsidiaries, owns 100% of the outstanding voting shares of each subsidiary.