Net Income/(Loss) per Share
Basic and diluted net income/(loss) per share are calculated by dividing net income/(loss) by the number of basic and diluted weighted-average ordinary shares outstanding during the period. For the years ended December 31, 2025, 2024, and 2023, the weighted-average ordinary shares outstanding used to calculate basic and diluted net income/(loss) per share were as follows:
For the year ended December 31,
(In millions)
202520242023
Basic weighted-average ordinary shares outstanding146.5 150.4 152.1 
Dilutive effect of stock options
— — — 
Dilutive effect of unvested restricted securities
0.6 0.3 — 
Diluted weighted-average ordinary shares outstanding147.1 150.7 152.1 
Net income/(loss) and net income/(loss) per share are presented in the consolidated statements of operations.
Certain potential ordinary shares were excluded from our calculation of diluted weighted-average ordinary shares outstanding because either they would have had an anti-dilutive effect on net income/(loss) per share or they related to equity awards that were contingently issuable for which the contingency had not been satisfied. Refer to Note 4: Share-Based Compensation for additional information related to our equity awards. These potential ordinary shares are as follows:
For the year ended December 31,
(In millions)
202520242023
Anti-dilutive shares excluded1.0 1.3 2.9 
Contingently issuable shares excluded0.9 0.9 1.2 

About Earnings Per Share Disclosures

The earnings per share disclosure breaks down the calculation from net income to both basic and diluted EPS, revealing the full impact of a company's capital structure on per-share economics. The reconciliation between basic and diluted share counts exposes how many stock options, RSUs, convertible securities, and warrants are potentially dilutive to existing shareholders.

Key signals: a widening gap between basic and diluted shares indicates growing dilution from equity compensation or convertible instruments. Anti-dilutive securities excluded from the diluted calculation deserve attention — they represent latent dilution that will materialize if the stock price rises. Watch for the effect of share buybacks on per-share metrics: EPS growth driven primarily by repurchases rather than income growth signals weakening fundamentals. Compare year-over-year changes in the diluted share count against equity compensation expense to assess whether management is effectively managing dilution.