Exhibit 21

Subsidiaries of Cabot Corporation (as of September 30, 2022)*

Subsidiary	State/Jurisdiction of Incorporation
Cabot Argentina S.A.I.C.	Argentina
Cabot Australia Holdings Pty. Ltd.	Australia
Cabot Plastics Belgium S.A.	Belgium
Cabot Performance Materials Belgium S.P.R.L.	Belgium
Cabot Brasil Industria e Comércio Ltda.	Brazil
Cabot Canada Ltd.	Ontario, Canada
8755329 Canada, Inc.	Quebec, Canada
Tech Blend Corporation	Quebec, Canada
Cabot Plastics Canada LP	Quebec, Canada
Cabot Plastics Hong Kong Limited	China
Shanghai Cabot Chemical Company Ltd.	China
Cabot Trading (Shanghai) Company Ltd.	China
Cabot (China) Limited	China
Cabot Advanced Battery Materials (Tianjin) Co., Ltd	China
Cabot Bluestar Chemical (Jiangxi) Co., Ltd.	China
Cabot Chemical (Tianjin) Co., Ltd.	China
Cabot Performance Materials (Shenzhen) Co., Ltd.	China
Cabot Performance Materials (Zhuhai) Co., Ltd.	China
Cabot Performance Products (Tianjin) Co., Ltd.	China
Cabot Risun Chemical (Xingtai) Co., Ltd.	China
Cabot HengYeCheng Performance Materials (Inner-Mongolia) Company Limited	China
Cabot Performance Materials (Xuzhou) Co., Ltd. (fka NSCC Carbon (Jiangsu) Co., Ltd.)	China
Cabot Colombiana S.A.	Colombia
CS Cabot spol, s.r.o.	Czech Republic
Cabot Czech Holding Company s.r.o.	Czech Republic
Cabot France S.A.S.	France
Cabot Carbone S.A.S.	France
Cabot GmbH	Germany
Cabot Holdings I GmbH	Germany
Cabot Holdings II GmbH	Germany
Cabot Aerogel GmbH	Germany
Cabot India Limited	India
P.T. Cabot Indonesia	Indonesia
PT Cabot Asia Pacific South	Indonesia
Cabot Italiana S.p.A.	Italy

Subsidiary	State/Jurisdiction of Incorporation
Cabot Performance Materials Italy S.r.l	Italy
Aizu Holdings G.K.	Japan
Cabot Japan K.K.	Japan
Cabot Supermetals K.K.	Japan
Cabot Korea Y.H.	Korea
SIA Cabot Latvia	Latvia
Cabot Luxembourg Holdings S.à.r.l.	Luxembourg
Cabot Luxembourg Holdings II S.à.r.l.	Luxembourg
Cabot Luxembourg Investments S.à.r.l.	Luxembourg
Cabot Luxembourg TC S.à.r.l.	Luxembourg
Cabot NHUMO Holdings I S.à.r.l.	Luxembourg
Cabot Asia Sdn. Bhd.	Malaysia
Cabot Materials Research Sdn Bhd.	Malaysia
Cabot (Malaysia) Sdn. Bhd.	Malaysia
CMHC, Inc.	Mauritius
Cabot Singapore Pte. Ltd.	Singapore
Cabot NHUMO Holding S.A.P.I., de C.V.	Mexico
Cabot Specialty Chemicals Mexico S.A.P.I. de C.V.	Mexico
Cabot S.A.	Spain
Cabot International GmbH	Switzerland
Cabot Switzerland GmbH	Switzerland
Cabot B.V.	The Netherlands
Cabot Finance B.V.	The Netherlands
Cabot Performance Materials Netherlands B.V.	The Netherlands
Cabot Turkey Performans Malzemeleri Anonim Şirketi	Turkey
Black Rose Investments Limited	British Virgin Islands
Dragón Verde Investments Limited	British Virgin Islands
AHB Investments Limited	British Virgin Islands
HDF Investments Limited	British Virgin Islands
Ramaai Holdings Limited	British Virgin Islands
Cabot Performance Products FZE	Dubai, United Arab Emirates
Botsel Limited	United Kingdom (England)
Cabot Carbon Limited	United Kingdom (England)
Cabot G.B. Limited	United Kingdom (England)
Cabot Plastics Limited	United Kingdom (England)
Cabot U.K. Limited	United Kingdom (England)
Cabot UK Holdings Limited	United Kingdom (England)
Cabot Performance Materials UK Limited	United Kingdom (England)

Subsidiary	State/Jurisdiction of Incorporation
Cabot Activated Carbon Holdings UK Limited	United Kingdom (England)
Cabot Activated Carbon UK Limited	United Kingdom (England)
Applied NanoStructured Solutions, LLC	Delaware, United States
Beyond Lotus LLC	Delaware, United States
Cabot Asia Investments Corporation	Delaware, United States
Cabot Ceramics, Inc.	Delaware, United States
Cabot Corporation Foundation, Inc.	Massachusetts, United States
Cabot CSC LLC	Delaware, United States
Cabot Europe Limited	Delaware, United States
Cabot Holdings LLC	Delaware, United States
Cabot Insurance Co. Ltd. (Vermont)	Vermont, United States
Cabot International Capital Corporation	Delaware, United States
Cabot International Services Corporation	Massachusetts, United States
Cabot Specialty Chemicals, Inc.	Delaware, United States
CDE Company	Delaware, United States
Energy Transport Limited LLC	Delaware, United States
Kawecki Chemicals, Inc.	Delaware, United States
Cabot Activated Carbon LLC	Delaware, United States
Northeast Boulevard, LLC	Florida, United States
Representaciones 1, 2 y 3 C.A.	Venezuela
Valores Ramaai C.A.	Venezuela

*Note that the entities that were sold as a result of the divestiture of our Purification Solutions business on March 1, 2022 have been removed.  The three UK entities that entered into Member’s Voluntary Dissolution on September 15, 2022 have also been removed.