Press Release

Cabot Corporation to Increase Prices for Activated Carbon Globally

BOSTON – May 1, 2017– Effective for all shipments made on or after June 1, 2017, or as  customer contracts allow, Cabot Norit Activated Carbon is increasing prices  globally on all grades of activated carbon.  Average price increases will range from 5 to 10 percent, depending on the  specific activated carbon product and region. Currency fluctuations, certain feedstock  cost increases including coal, char, natural gas and utilities, higher freight  costs, and new environmental controls have led to significant cost increases  for the Cabot Norit Activated Carbon business. Due to the business’s global  footprint and rigorous focus on costs, it has been able to absorb cost increases  so far. However, these price increases are necessary to support Cabot’s  continued investment in product and application development. It will also help  to ensure that Cabot remains a reliable, long-term supplier of high quality activated  carbon products, and to enable Cabot to continue to deliver exceptional support  to its 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, fumed  metal oxides, masterbatches  and conductive compoundsinkjet colorantscesium formate  drilling fluids 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.