Officer Transactions Report

Karen A. Kalita, SVP and General Counsel of CABOT CORP, reported a transaction involving 28.4703 Phantom Stock Units with a per-share price of $87.65. The transaction, which occurred on June 12, 2026, resulted in a post-transaction holding of 5309.7899 units. These units are to be settled upon the reporting person's retirement or termination of employment, as per footnote F2. The report was signed on June 16, 2026, by Jennifer Lombardi under a power of attorney.