State Street Selected to Provide Global Custody Services for Banco de Guatemala; New Mandate Comes from Largest Monetary Authority in Central America.

BOSTON -- State Street Corporation (NYSE:STT), the world's leading provider of services to institutional investors, announced today that it has been appointed by Banco de Guatemala, Central America's largest monetary authority, to provide global custody, accounting, and performance measurement services for $3.3 billion in assets.

"We went through a rigorous selection process to consolidate our global custody services with one single provider," said Edwin Matul Ruano, general manager of Banco de Guatemala. "State Street's reputation, knowledge and experience, among other things, were clear differentiators for us in choosing a global provider."

State Street has seen a surge in new customer mandates in Latin America following its acquisition of Deutsche Bank's global securities services businesses in 2003. Earlier this year, State Street was appointed to provide a range of global investment services by Profuturo GNP, Mexico's largest locally-owned pension fund administrator and the third largest Mexican pension manager overall.

"We're delighted and honored to welcome Banco de Guatemala to our expanding roster of clients in Latin America," said Lee Jones, senior vice president of State Street Corporation. "This mandate is another testament to the value that we can deliver to our customers throughout this important region."

Banco de Guatemala is the Central Bank of the Republic of Guatemala and it is an autonomous institution, constituted in 1945, commissioned to execute monetary policy. Its fundamental objective is to contribute to the creation and maintenance of the most favorable conditions for the orderly development of the Guatemalan economy, propitiating the monetary, exchange and credit conditions that promote the stability in the general level of prices.

State Street Corporation (NYSE: STT) is the world's leading specialist in providing institutional investors with investment servicing, investment management and investment research and trading. With $9.6 trillion in assets under custody and $1.4 trillion in assets under management, as of June 30, 2005, State Street operates in 25 countries and more than 100 markets worldwide. For more information, visit State Street's web site at www.statestreet.com.