UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ----------------------------------- FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (date of earliest event reported): August 5, 2002 CABOT CORPORATION - -------------------------------------------------------------------------------- (Exact name of registrant as specified in its charter) DELAWARE 1-5667 04-2271897 - ---------------------------- ------------------------ ------------------- (State or other jurisdiction (Commission File Number) (IRS Employer of incorporation) Identification No.) TWO SEAPORT LANE, SUITE 1300, BOSTON, MASSACHUSETTS 02210-2019 - -------------------------------------------------------------------------------- (Address of principal executive offices) (Zip Code) (617) 345-0100 - -------------------------------------------------------------------------------- (Registrant's telephone number, including area code) ----------------------------------- Page 1 of 5

Item 5. OTHER EVENTS AND REGULATION FD DISCLOSURE. On August 5, 2002, Cabot Corporation ("Cabot") issued a press release, announcing that one of its tantalum customers, AVX Corporation, filed a complaint against Cabot involving a supply agreement between Cabot and AVX. The text of Cabot's News Release, dated August 5, 2002, is attached as Exhibit 99.1 to this current report on Form 8-K. Item 7. FINANCIAL STATEMENTS AND EXHIBITS. (c) Exhibits The following exhibit is filed herewith: 99.1 Text of Cabot Corporation News Release, dated August 5, 2002. 2

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. CABOT CORPORATION Date: August 6, 2002 By: /s/ John A. Shaw ----------------------------------- John A. Shaw Executive Vice President and Chief Financial Officer 3

INDEX TO EXHIBIT EXHIBIT NUMBER TITLE - ------- ----- 99.1 News Release of Cabot Corporation, dated August 5, 2002. 4

Exhibit 99.1 FOR IMMEDIATE RELEASE Contact: James P. Kelly Director, Investor Relations (617) 342-6244 jim_kelly@cabot-corp.com Cabot Corporation and AVX in Tantalum Supply Dispute AVX Files Complaint in U.S. District Court BOSTON, MA - (August 5, 2002) - Cabot Corporation (NYSE: CBT) today announced that one of its tantalum customers, AVX Corporation (NYSE: AVX), filed a complaint against Cabot in U.S. District Court in Massachusetts on July 29, 2002. The complaint involves a supply agreement between Cabot and AVX entered into in January 2001 and claims unfair and deceptive trade practices, breach of contract, and other related matters. Cabot believes that AVX's complaint is not meritorious and that Cabot has valid defenses, which it intends to assert vigorously. AVX has indicated, however, that it intends to continue to purchase product under the supply agreement with Cabot. The parties are in discussions and Cabot is hopeful that an amicable resolution will be reached. CABOT CORPORATION IS A GLOBAL SPECIALTY CHEMICALS AND MATERIALS COMPANY AND IS HEADQUARTERED IN BOSTON, MASSACHUSETTS. CABOT'S MAJOR PRODUCTS ARE CARBON BLACK, FUMED SILICA, INKJET COLORANTS, AND CAPACITOR MATERIALS. CABOT HAS APPROXIMATELY 4,200 EMPLOYEES IN MORE THAN 45 MANUFACTURING PLANTS AND OFFICES LOCATED IN 23 COUNTRIES AROUND THE WORLD. THE WEBSITE ADDRESS IS www.cabot-corp.com. 5