SEC Filing Summary

William F. Masterson III, Senior Vice President of Cabot Corp, acquired 3.3701 phantom stock units with a price per share of $69.49. These units are part of a supplemental 401(k) plan and will be settled upon retirement or termination of employment. The transaction occurred on March 13, 2026. Following this acquisition, Mr. Masterson now owns 523.7950 phantom stock units. The underlying security for these units is Cabot Corp common stock.