Press Release

Cabot Corporation to Increase Prices in EMEA for Rubber Carbon Black Products

BOSTON – May 12, 2017 - Effective for all shipments  made on or after June 12, 2017, or as customer contracts allow, Cabot Corporation is increasing prices on  all carbon black products in its Reinforcement Materials segment sold in the  Europe, Middle East and Africa (EMEA) region.

As the carbon black industry continues to transform, Cabot  is experiencing significant cost pressures due to high utilization rates,  increased requirements to meet new regulations and sourcing challenges for  feedstock that is specifically selected for the production of carbon black in  the EMEA region. Despite ongoing efforts to offset these costs, price  adjustments will be implemented in the range of 50 to 80 €/MT, in addition to  any applicable feedstock index-related adjustments, for rubber carbon black  products.

The increase is necessary to ensure Cabot remains a  reliable, long-term supplier of high quality carbon black products, and ensures  continued investment in new products and applications development to support  customers.

ABOUT CABOT CORPORATION

Cabot Corporation (NYSE:  CBT) is a global specialty chemicals and performance materials company,  headquartered in Boston, Massachusetts. The company is a leading provider of rubber and specialty carbons, activated carbon, inkjet colorants, cesium formate drilling fluids, fumed silica, and aerogel. For more information on Cabot, please visit the  company’s website at: http://www.cabotcorp.com.

Safe  Harbor Statement under the Private Securities Litigation Reform Act of 1995:  Statements in the press release regarding Cabot’s business that are not  historical facts are forward looking statements that involve risks and  uncertainties. For a discussion of such risks and uncertainties, which could  cause actual results to differ from those contained in the forward looking  statements, see “Risk Factors” in the Company's Annual Report on Form 10-K.