CABOT CORP Auditor
The independent registered public accounting firm that signed the audit report in each annual report on Form 10-K, newest first. PCAOB firm ID and the internal-control attestation are as tagged on the cover from fiscal 2021; earlier rows come from the signed report text.
- 2025-11-24: Fiscal year end 2025-09-30; Auditor Deloitte & Touche LLP; PCAOB firm ID 34; Location Boston, Massachusetts.
- 2024-11-20: Fiscal year end 2024-09-30; Auditor Deloitte & Touche LLP; PCAOB firm ID 34; Location Boston, Massachusetts.
- 2023-11-22: Fiscal year end 2023-09-30; Auditor Deloitte & Touche LLP; PCAOB firm ID 34; Location Boston, Massachusetts.
- 2022-11-23: Fiscal year end 2022-09-30; Auditor Deloitte & Touche LLP; PCAOB firm ID 34; Location Boston, Massachusetts.
| Filed | Fiscal year end | Auditor | PCAOB firm ID | Location | Internal-control attestation |
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| 2025-11-24 | 2025-09-30 | Deloitte & Touche LLP | 34 | Boston, Massachusetts | Yes |
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| 2024-11-20 | 2024-09-30 | Deloitte & Touche LLP | 34 | Boston, Massachusetts | Yes |
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| 2023-11-22 | 2023-09-30 | Deloitte & Touche LLP | 34 | Boston, Massachusetts | Yes |
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| 2022-11-23 | 2022-09-30 | Deloitte & Touche LLP | 34 | Boston, Massachusetts | Yes |
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| 2021-11-29 | 2021-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | Yes |
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| 2020-11-25 | 2020-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2019-11-22 | 2019-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2018-11-21 | 2018-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2017-11-22 | 2017-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2016-11-23 | 2016-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2015-11-25 | 2015-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2014-11-26 | 2014-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2013-11-27 | 2013-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2012-11-29 | 2012-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2011-11-29 | 2011-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2010-11-29 | 2010-09-30 | Deloitte & Touche LLP | | Boston, Massachusetts | |
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| 2009-11-30 | 2009-09-30 | Deloitte & Touche LLP | | Boston, MA | |
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