Company Update

Securities and Exchange Commission on August 11, 2016. The Notes were issued pursuant to an indenture dated September 15, 2016 (the “Base Indenture”), as supplemented by the Second Supplemental Indenture dated June 20, 2019 (the “Second Supplemental Indenture”), by and between Cabot and U.S. Bank National Association, as trustee. Cabot is filing the executed Second Supplemental Indenture as Exhibit 4.1 to this Current Report on Form 8-K. Cabot intends to use the net proceeds of the offering to repay a portion of its outstanding commercial paper and the remainder, if any, for working capital and other general corporate purposes. Item 9.01 Financial Statements and Exhibits. (d) Exhibits . Exhibit 4.1 Second Supplemental Indenture, dated June 20, 2019, between Cabot Corporation and U.S. Bank National Association, including the form of Global Note attached as Annex A thereto. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. CABOT CORPORATION By: /s/ Erica McLaughlin Erica McLaughlin Senior Vice President and Chief Financial Officer Date: June 20, 2019