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Earnings Per Share | 9 Months Ended
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Jun. 30, 2026
Earnings Per Share [Abstract] |
Earnings Per Share | H. Earnings Per Share The following tables summarize the components of the basic and diluted earnings (loss) per common share (“EPS”) computations:
|  | Three Months Ended June 30 |  |  | Nine Months Ended June 30 |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
|  | (In millions, except per share amounts) |
Basic EPS: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Cabot Corporation |  | $ | 6 |  |  | $ | 101 |  |  | $ | 147 |  |  | $ | 288 |
Less: Dividends and dividend equivalents to participating securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |
Less: Undistributed earnings allocated to participating securities(1) |  |  | — |  |  |  | 1 |  |  |  | 2 |  |  |  | 3 |
Earnings (loss) allocated to common stockholders (numerator) |  | $ | 6 |  |  | $ | 100 |  |  | $ | 145 |  |  | $ | 284 |
Weighted average common shares and participating securities outstanding |  |  | 52.3 |  |  |  | 54.2 |  |  |  | 52.9 |  |  |  | 54.7 |
Less: Participating securities(1) |  |  | 0.7 |  |  |  | 0.7 |  |  |  | 0.8 |  |  |  | 0.8 |
Adjusted weighted average common shares (denominator) |  |  | 51.6 |  |  |  | 53.5 |  |  |  | 52.1 |  |  |  | 53.9 |
Earnings (loss) per common share - basic: |  | $ | 0.12 |  |  | $ | 1.87 |  |  | $ | 2.79 |  |  | $ | 5.27 |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) allocated to common stockholders |  | $ | 6 |  |  | $ | 100 |  |  | $ | 145 |  |  | $ | 284 |
Plus: Earnings allocated to participating securities |  |  | — |  |  |  | 1 |  |  |  | 2 |  |  |  | 4 |
Less: Adjusted earnings allocated to participating securities(2) |  |  | — |  |  |  | 1 |  |  |  | 2 |  |  |  | 4 |
Earnings (loss) allocated to common stockholders (numerator) |  | $ | 6 |  |  | $ | 100 |  |  | $ | 145 |  |  | $ | 284 |
Adjusted weighted average common shares outstanding |  |  | 51.6 |  |  |  | 53.5 |  |  |  | 52.1 |  |  |  | 53.9 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Common shares issuable(3) |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.3 |  |  |  | 0.5 |
Adjusted weighted average common shares (denominator) |  |  | 52.0 |  |  |  | 53.8 |  |  |  | 52.4 |  |  |  | 54.4 |
Earnings (loss) per common share - diluted: |  | $ | 0.12 |  |  | $ | 1.86 |  |  | $ | 2.77 |  |  | $ | 5.22 |
(1) Participating securities consist of shares underlying unvested time-based restricted stock units (the "TSUs"), earned and unvested performance-based restricted stock units (the "PSUs", and referred to in this note collectively with the TSUs as the "RSUs"), stock units accounted for under the Supplemental 401(k) Plan portion of the Company’s Deferred Compensation and Supplemental Retirement Plan, and stock units and phantom stock units accounted for under the Company’s Non-Employee Directors’ Deferral Plan. The holders of RSUs are entitled to receive dividend equivalents, payable in cash, to the extent dividends are paid on the outstanding shares of Common Stock, and equal in value to the dividends that would have been paid in respect of the Common Stock underlying the RSU. The accounts of holders of stock units and phantom stock units are credited with dividend equivalents, which are payable, in stock or cash, as the case may be, with the distribution of account balances. Undistributed earnings are the earnings which remain after dividends declared during the period are assumed to be distributed to the common shares and participating securities. Undistributed earnings are allocated to common stockholders and participating security holders on the same basis as dividend distributions. The calculation of undistributed earnings is as follows:
|  | Three Months Ended June 30 |  |  | Nine Months Ended June 30 |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
|  | (In millions) |
Calculation of undistributed earnings (loss): |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Cabot Corporation |  | $ | 6 |  |  | $ | 101 |  |  | $ | 147 |  |  | $ | 288 |
Less: Dividends declared on common stock |  |  | 24 |  |  |  | 24 |  |  |  | 72 |  |  |  | 70 |
Less: Dividends declared on participating securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |
Undistributed earnings (loss) |  | $ | (18 | ) |  | $ | 77 |  |  | $ | 75 |  |  | $ | 217 |
Allocation of undistributed earnings (loss): |  |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings (loss) allocated to common stockholders |  | $ | (18 | ) |  | $ | 76 |  |  | $ | 73 |  |  | $ | 214 |
Undistributed earnings allocated to participating security holders |  |  | — |  |  |  | 1 |  |  |  | 2 |  |  |  | 3 |
Undistributed earnings (loss) |  | $ | (18 | ) |  | $ | 77 |  |  | $ | 75 |  |  | $ | 217 |
(2) Undistributed earnings are adjusted for the assumed distribution of dividends to the dilutive securities, which are described in (3) below, and then reallocated to participating securities. (3) Represents incremental shares of common stock from the assumed exercise of stock options issued under Cabot’s equity incentive plans. For the three and nine months ended June 30, 2026, 107,275 and 623,823 incremental shares of common stock, respectively, were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive. For the three and nine months ended June 30, 2025, 284,730 and 93,576 incremental shares of common stock, respectively, were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive.

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