Shareholder Services

Stock Listing
Cabot Corporation common stock is listed on the New York Stock Exchange under the symbol CBT.

Stock Transfer Agent and Registrar
Registered shareholders may contact the transfer agent by Internet or by phone for information or assistance with receiving proxy materials electronically by Internet, direct deposit of dividend payments, dividend check replacements, account history, lost stock certificates, taxable income or to report address changes. The transfer agent provides telephone assistance Monday through Friday, 9:00 a.m. to 5:00 p.m. (Eastern Time). Extended service is available 24 hours a day, seven days a week to callers with touch-tone telephones via the transfer agent's Interactive Voice Response System.

Please mention Cabot Corporation, your name as printed on your stock certificates or account, your Social Security number and your address and telephone number in all correspondences with the transfer agent.

Computershare Trust Company, N.A.
c/o Computershare Investor Services
P.O. Box 43078
Providence, Rhode Island 02940-3078

Stockholder inquiries: (781) 575-3170 or (800) 730-4001
For the hearing impaired: (800) 952-9245 (TTY/TDD)
Web site: www.computershare.com/investor