Cabot Corporation to Celebrate 35th Anniversary of Listing on the New York Stock Exchange

September 17, 2003
Chairman, President and CEO Kennett F. Burnes to Ring The Closing BellTM

Boston, MA - (September 17, 2003) - Cabot Corporation (NYSE:CBT) Chairman and CEO Kennett Burnes will mark 35 years of the Company's listing on the NYSE with a visit to Wall Street to ring the closing bell on Thursday, September 18, 2003 at 4:00 PM EST.

"Thirty-five years on the NYSE is an achievement that we are very proud of and that only a few companies have reached. We are looking forward to being represented on the NYSE for many years to come," said Mr. Burnes.

Joining Mr. Burnes on the podium for the bell ringing ceremony will be Executive Vice President and Chief Financial Officer John Shaw, Executive Vice President Bill Brady, Vice President Tom Odle, and Director of Investor Relations Jim Kelly. NYSE Executives will be present on the podium as well.

In recognition of this milestone anniversary, Mr. Burnes will present a donation from the Cabot Corporation Foundation to the NYSE's Fallen Heroes Fund.

Founded in 1882, Cabot Corporation is a global specialty chemicals and materials company headquartered in Boston, Massachusetts. Cabot's major products are carbon black, fumed silica, inkjet colorants, and capacitor materials. Cabot operates more than 45 manufacturing plants and offices located in 23 countries around the world.