Sean D. Keohane - 28 Aug 2026 Form 4 Insider Report for CABOT CORP (CBT)

Reporting relationship: President and CEO, Director
Issuer ticker: CBT
Reported as of: 28 Aug 2026
Net transaction value: -$11,466,075
SEC form: 4
Accepted by SEC: 31 Aug 2026, 19:00:03 UTC
Prior SEC filing: 26 Aug 2026
Source filing: View source filing
Reporting owner signature: By: Jennifer M. Lombardi, pursuant to a power of attorney from Sean D. Keohane

Key filing fact

Sean D. Keohane filed Form 4 for CABOT CORP (CBT) on 31 Aug 2026.

Key facts

This page summarizes Sean D. Keohane's Form 4 filing for CABOT CORP (CBT).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 31 Aug 2026, 19:00.

Change

Previous filing in this sequence was filed on 26 Aug 2026.
Current net transaction value: -$11,466,075.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001435737 Primary reporting owner

Keohane Sean D

Relationship: President and CEO, Director
Address: C/O CABOT CORPORATION, TWO SEAPORT LANE, SUITE 1400, BOSTON
Signature: By: Jennifer M. Lombardi, pursuant to a power of attorney from Sean D. Keohane
Signature date: 31 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CBT transaction

Common Stock

Options Exercise

Transaction value
Shares: +134,895
Change %: +33%
Price: $50.00^*
Shares after: 539,029
Date: 28 Aug 2026
Ownership: Direct

CBT transaction

Common Stock

Sale

Transaction value: $11,466,075
Shares: -134,895
Change %: -25%
Price: $85.00
Shares after: 404,134
Date: 28 Aug 2026
Ownership: Direct

CBT holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 14,264
Date: 28 Aug 2026
Ownership: Through the Trustee for the Corporation's 401(k) Plan

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

CBT transaction Derivative

Employee Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -134,895
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 28 Aug 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 134,895
Exercise price: $50.00
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

137,674 shares were subject to the option. The option vested over a three year period as follows: 30% on November 9, 2019, 30% on November 9, 2020, and 40% on November 9, 2021.