Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the periods. Diluted earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average common shares and common share equivalents outstanding during the periods. The dilutive effect of common share equivalents is considered in the diluted earnings per share computation using the treasury stock method, which includes consideration of equity awards.
The following table sets forth the details of basic and diluted earnings per share:
 Year Ended December 31,
 202520242023
(In millions, except per share data)  
Net income attributable to WESCO International, Inc.$640.2 $717.6 $765.5 
Plus: Gain on redemption of Series A Preferred Stock32.9 — — 
Less: Preferred stock dividends27.3 57.4 57.4 
Net income attributable to common stockholders$645.8 $660.2 $708.1 
Weighted-average common shares outstanding used in computing basic earnings per share
48.7 49.8 51.1 
Common shares issuable upon exercise of dilutive equity awards0.8 0.8 1.2 
Weighted-average common shares outstanding and common share equivalents used in computing diluted earnings per share
49.5 50.6 52.3 
Earnings per share attributable to common stockholders 
Basic$13.26 $13.26 $13.86 
Diluted$13.05 $13.05 $13.54 
The computation of diluted earnings per share attributable to common stockholders excludes stock-based awards that would have had an antidilutive effect on earnings per share. For the years ended December 31, 2025, 2024, and 2023, there were approximately 0.1 million, 0.2 million and 0.2 million antidilutive stock-based awards, respectively.

Historical Timeline

Fiscal YearFiled
2025Feb 13, 2026Showing above
2024Feb 14, 2025
2023Feb 20, 2024
2022Feb 21, 2023
2021Feb 25, 2022
2020Mar 1, 2021
2019Feb 24, 2020
2018Feb 27, 2019
2017Feb 22, 2018
2016Feb 22, 2017
2015Feb 22, 2016

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.