CBT · Cabot Corp

The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $85.970 to $86.815, inclusive. The reporting person undertakes to provide to the staff of the Securities and Exchange Commission, the Corporation or any security holder of the Corporation, upon request, full information regarding the number of shares sold at each separate price.

91,923 shares were subject to the option. The option vested over a three year period as follows: 30% on November 10, 2018, 30% on November 10, 2019, and 40% on November 10, 2020.

1 for 1

The phantom stock will be settled in cash either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Non-Employee Director's Deferral Plan and will be settled either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Non-Employee Director's Deferral Plan and will be settled either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

The phantom stock will be settled in cash either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Non-Employee Director's Deferral Plan and will be settled either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Non-Employee Director's Deferral Plan and will be settled either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

The shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan.

The shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan.

The shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan.

The shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan.

The shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan.

The shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan.

The shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan.

The shares have been deferred pursuant to Cabot's Non-Employee Directors' Deferral Plan.

1 for 1

The phantom stock will be settled in cash either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Disposition of phantom stock units in accordance with the distribution election of the reporting person under the Non-Employee Director's Deferral Plan.

1 for 1

The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service.

1 for 1

The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service.

1 for 1

The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service.

1 for 1

The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service.

1 for 1

The reported phantom stock units were acquired under the Corporation's supplemental 401(k) plan and are to be settled upon the reporting person's retirement or other termination of service.

1 for 1

The phantom stock will be settled in cash either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Non-Employee Director's Deferral Plan and will be settled either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Non-Employee Director's Deferral Plan and will be settled either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Non-Employee Director's Deferral Plan and will be settled either upon the reporting person's termination of service as a director or in accordance with the distribution election of the reporting person, whichever first occurs.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

1 for 1

Represents dividends paid on phantom stock units acquired under the Corporation's Supplemental 401(k) Plan and are to be settled upon the reporting person's retirement or other termination of employment.

The option vests over a three year period as follows: 30% on December 3, 2026, 30% on December 3, 2027 and 40% on December 3, 2028.