EXHIBIT 21.1 SUBSIDIARIES OF STATE STREET BOSTON CORPORATION The following table sets forth the name of each subsidiary and the state or other jurisdiction of its organization. Certain subsidiaries of State Street have been omitted in accordance with the SEC rules because, when considered in the aggregate, they did not constitute a significant subsidiary of State Street. State or Jurisdiction Name of Organization State Street Bank and Trust Company Massachusetts State Street Bank and Trust Company, N.A. New York State Street Bank and Trust Company of New Hampshire, N.A. New Hampshire State Street Bank and Trust Company of Missouri, N.A. Missouri State Street Boston Capital Corporation Massachusetts State Street Boston Leasing Company, Inc. Massachusetts SPLS, Inc. Massachusetts State Street California, Inc. California State Street Massachusetts Securities Corporation Massachusetts State Street Bank International New York State Street Video Services, Inc. Massachusetts High Street Investments, Inc. Massachusetts Investors Fiduciary Trust Company Missouri Princeton Financial Systems, Inc. New Jersey Wendover Financial Services Corporation North Carolina State Street International Holdings Massachusetts State Street Australia Limited New South Wales State Street Bank GmbH Germany State Street Bank Luxembourg, S.A. Luxembourg State Street Banque, S.A. France State Street Gestion, S.A. France State Street Trust Company, Canada Canada State Street Trust and Banking Company Limited Japan European Financial Data Services Limited (50% owned) United Kingdom SSB Investments, Inc. Massachusetts SSB Realty, Inc. Massachusetts State Street Florida, Inc. Florida State Street Global Advisors, Inc. Delaware State Street Global Advisors, United Kingdom, Limited United Kingdom State Street Global Advisors, Australia, Limited New South Wales Boston Financial Data Services (50% owned) Massachusetts All of the above wholly-owned subsidiaries are included in the consolidated financial statements for State Street.