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Earnings (Loss) per Share | 9 Months Ended
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Sep. 28, 2025
Earnings (Loss) per Share [Abstract] |
Earnings (Loss) per Share | Note 3. Earnings (loss) per Share (EPS) Basic earnings (loss) per share are based upon the weighted average number of common shares outstanding during the period. Diluted earnings (loss) per share are based upon the weighted average number of common shares outstanding during the period, assuming the issuance of common shares for all potentially dilutive common shares outstanding. The following table sets forth the computation of basic and diluted earnings (loss) per share:
| Three Months Ended |  | Nine Months Ended
|  | Sep. 28, |  |  |  | Sep. 29, |  |  |  | Sep. 28, |  |  |  | Sep. 29, |
(in millions of dollars, except per share data) |  | 2025 |  |  |  | 2024 |  |  |  | 2025 |  |  |  | 2024 |
Net income (loss) attributable to Minerals Technologies Inc. | $ | 43.0 |  |  | $ | 46.7 |  |  | $ | (55.6 | ) |  | $ | 113.1 |
Weighted average shares outstanding |  | 31.3 |  |  |  | 32.1 |  |  |  | 31.6 |  |  |  | 32.2 |
Dilutive effect of stock options and deferred restricted stock units |  | - |  |  |  | 0.2 |  |  |  | - |  |  |  | 0.2 |
Weighted average shares outstanding, adjusted |  | 31.3 |  |  |  | 32.3 |  |  |  | 31.6 |  |  |  | 32.4 |
Basic earnings (loss) per share attributable to Minerals Technologies Inc. | $ | 1.37 |  |  | $ | 1.45 |  |  | $ | (1.76 | ) |  | $ | 3.51 |
Diluted earnings (loss) per share attributable to Minerals Technologies Inc. | $ | 1.37 |  |  | $ | 1.45 |  |  | $ | (1.76 | ) |  | $ | 3.49 |
Of the options outstanding of 1,582,083 and 1,466,366 for the three-month and nine-month periods ended September 28, 2025 and September 29, 2024, respectively, options to purchase 1,209,857 shares and 660,373 shares of common stock for the three-month and nine-month periods ending September 28, 2025 and September 29, 2024, respectively, were not included in the computation of diluted earnings (loss) per share because they were anti-dilutive, as the exercise prices of the options were greater than the average market price of the common shares. Due to our net loss in the nine month period ended September 28, 2025, all options to purchase shares were anti-dilutive and were excluded.

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