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Earnings (Loss) per Share
 6 Months Ended
Jun. 29, 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
    
Six Months Ended
  
(in millions of dollars, except per share data)
  
Jun. 29,
2025
    
Jun. 30,
2024
    
Jun. 29,
2025
    
Jun. 30,
2024
  
Net income (loss) attributable to Minerals Technologies Inc.
  
$
45.4
    
$
19.7
    
$
(98.6
)
  
$
66.4
  
                                 
Weighted average shares outstanding
    
31.6
      
32.2
      
31.7
      
32.3
  
Dilutive effect of stock options and deferred restricted stock units
    
—
      
0.2
      
—
      
0.1
  
Weighted average shares outstanding, adjusted
    
31.6
      
32.4
      
31.7
      
32.4
  
                                 
Basic earnings (loss) per share attributable to Minerals Technologies Inc.
  
$
1.44
    
$
0.61
    
$
(3.11
)
  
$
2.06
  
                                 
Diluted earnings (loss) per share attributable to Minerals Technologies Inc.
  
$
1.44
    
$
0.61
    
$
(3.11
)
  
$
2.05
  


Of the options outstanding of 1,594,166 and 1,482,563 for the three-month and six-month periods ended June 29, 2025 and June 30, 2024, respectively, options to purchase 1,387,282 shares and 196,471 shares of common stock for the three-month and six-month periods ending June 29, 2025 and June 30, 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 six month period ended June 29, 2025, all options to purchase shares were anti-dilutive and were excluded.