STT State Street Corporation

State Street Corporation (NYSE: STT) today began sending precautionary notifications to employees and some customers of the former Investors Financial Services Corp. (�IBT�) that computer equipment containing certain personal data was stolen from a vendor�s facility. IBT had engaged the vendor for legal support services. There is no evidence to date to suggest that the data has been misused or that legacy State Street customers or employees are impacted. As a precaution, State Street is notifying legacy IBT employees and certain legacy IBT customers whose personal data was on the stolen computer equipment. This notification process is expected to be completed shortly. State Street has developed a dedicated section of its website with more details for the legacy IBT customers and employees who will receive these precautionary notifications. This information can be found at www.statestreet.com/notification and includes detail about a number of credit monitoring services being made available by State Street at no cost for two years. About State Street Corporation State Street Corporation (NYSE: STT) is the world's leading provider of financial services to institutional investors including investment servicing, investment management and investment research and trading. With $15 trillion in assets under custody and $2 trillion in assets under management at March 31, 2008, State Street operates in 26 countries and more than 100 geographic markets worldwide. For more information, visit State Street�s website at www.statestreet.com. Forward-Looking Statements This news announcement contains forward-looking statements as defined by United States securities laws, including statements about State Street�s goals, opportunities and business environment. These statements are not guarantees of future performance, are inherently uncertain, are based on current assumptions that are difficult to predict and involve a number of risks and uncertainties. Therefore, actual outcomes and results may differ materially from what is expressed in those statements, and those statements should not be relied upon as representing State Street's expectations or beliefs as of any date subsequent to the date of this release. Important factors that may affect future results and outcomes include State Street�s ability to obtain quality and timely services from third parties with which it contracts and the other financial, market, competitive, regulatory and business factors set forth in State Street's Quarterly Report on Form 10-Q for the quarter ended March 31, 2008 and its subsequent SEC filings. State Street encourages investors to read this 10-Q, particularly the section on Risk Factors, its Annual Report on Form 10-K for the year ended December 31, 2007 and its subsequent SEC filings for additional information with respect to any forward-looking statements and prior to making any investment decision. The forward-looking statements contained in this press release speak only as of the date hereof, May 29, 2008, and State Street will not undertake efforts to revise those forward-looking statements to reflect events after this date.