Tranche Update on Cabot Corporation's Equity Buyback Plan announced on January 13, 2015.

Cabot Corporation is a global specialty chemicals and performance materials company. The Company operates through two segments: Reinforcement Materials and Performance Chemicals. The Reinforcement Materials segment combines reinforcing carbons, engineered elastomer composites and EVOLVE Sustainable Solutions product. The reinforcing carbons products are used in tires and industrial products. In Performance Chemicals, it designs, manufacture and sell materials that deliver performance in a range of customer applications across the automotive, construction, infrastructure, inkjet printing, electronics, and consumer products sectors and in applications related to the generation, transmission and storage of energy. The Performance Chemicals segment combine specialty carbons, specialty compounds, battery materials, fumed metal oxides, aerogel and inkjet product lines. Its products include Carbon black, specialty carbons, battery materials, fumed silica, aerogel and inkjet colorants.