Cabot Corporation Voluntarily Delists From Discontinued Boston Stock Exchange

May 15, 2009

BOSTON, May 15 /PRNewswire-FirstCall/ -- On Friday, May 15, 2009, Cabot Corporation (NYSE: CBT) announced that it will voluntarily withdraw its common stock from NASDAQ OMX BX (formerly, the Boston Stock Exchange). Cabot has decided to voluntarily withdraw the listing in connection with the termination by the Exchange of its programs for listing and trading cash equities. Cabot's common stock continues to be listed on the New York Stock Exchange, its principal listing exchange.

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About Cabot Corporation

Cabot Corporation is a global performance materials company and is headquartered in Boston, MA. Cabot's major products are carbon black, fumed silica, inkjet colorants, capacitor materials, and cesium formate drilling fluids.

SOURCE: Cabot Corporation

CONTACT: Susannah R. Robinson, Director, Investor Relations of Cabot Corporation, +1-617-342-6129
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Web Site: http://www.cabot-corp.com