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Earnings per share
12 Months Ended
Dec. 31, 2024
Earnings per share [abstract]  
Earnings per share
4.6 Earnings per share
Basic earnings per share ("EPS") is calculated by dividing On’s net income for the period by the weighted average number of ordinary shares outstanding during the year.
Diluted EPS is calculated by dividing On’s net income for the period by the weighted average number of ordinary shares outstanding during the year plus the weighted average number of ordinary shares that would have been outstanding when assuming the conversion of all potentially dilutive share-based awards. Dilutive effects arise from equity settled shares associated with share-based compensation.
202420242023202320222022
Class AClass BClass AClass BClass AClass B
Weighted number of outstanding shares288,465,380 345,437,500 284,262,802 345,437,500 282,195,495 345,437,500 
Weighted number of shares with dilutive effects3,787,481 12,822,456 3,306,122 11,446,403 2,354,500 6,891,423 
Weighted number of outstanding shares (diluted and undiluted)292,252,861 358,259,956 287,568,924 356,883,903 284,549,995 352,328,923 
Net income (CHF in millions)216.3 25.9 70.9 8.6 51.4 6.3 
Basic EPS (CHF)0.75 0.07 0.25 0.02 0.18 0.02 
Diluted EPS (CHF)0.74 0.07 0.25 0.02 0.18 0.02