STT State Street Corporation

State Street Corporation (NYSE: STT) will host an Internet broadcast of its first-quarter earnings conference call on Tuesday, April 18, 2006 at 9:30 a.m. EDT, following the release of the Company's quarterly financial results. The call will be accessible on State Street's investor relations home page, at www.statestreet.com/stockholder, and by telephone at +1 719/457-2617 (Confirmation Code 4414294). Recorded replays of the earnings conference call will be available on the web site, and by telephone at +1 402/220-4230, beginning at 2:00 p.m. that day. State Street (NYSE: STT) is the world's leading specialist in providing institutional investors with investment servicing, investment management and investment research and trading services. With $10.1 trillion in assets under custody and $1.4 trillion in assets under management (as of December 31, 2005), State Street operates in 26 countries and more than 100 geographic markets worldwide and employs 20,965 worldwide. For more information, visit State Street's web site at www.statestreet.com or call 877/639-7788 (NEWS STT) toll-free in the United States and Canada, or +1 202/266-3340 outside those countries.