EXHIBIT 11 THE INTERPUBLIC GROUP OF COMPANIES, INC. AND ITS SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE (Dollars in Thousands Except Per Share Data) Three Months Ended September 30 ------------------------------- Basic 1999 1998<F1> ------------ ------------ Net income $ 59,044 $ 46,987 Weighted average number of common shares outstanding 274,301,278 270,915,168 Earnings per common and common equivalent share $ .22 $ .17 ============ ============ Three Months Ended September 30 ------------------------------- Diluted 1999 1998<F1> ------------ ------------ Net income $ 59,044 $ 46,987 Add: Dividends paid net of related income tax applicable to restricted stock 163 129 ------------ ------------ Net income, as adjusted $ 59,207 $ 47,116 ============ ============ Weighted average number of common shares outstanding 274,301,278 270,915,168 Weighted average number of incremental shares in connection with restricted stock and assumed exercise of stock options 10,442,297 9,549,074 ------------ ------------ Total 284,743,575 280,464,242 ============ ============ Earnings per common and common equivalent share $ .21 $ .17 ============ ============ Note: The computation of diluted EPS for 1999 excludes the assumed conversion of the 1.87% and 1.80% Convertible Subordinated Notes because they were antidilutive. Similarly, the computation of diluted EPS for 1998 excludes the assumed conversion of the 1.80% Convertible Subordinated Notes as they were antidilutive. <F1> All share data adjusted to reflect two-for-one stock split effective July 15, 1999. THE INTERPUBLIC GROUP OF COMPANIES, INC. AND ITS SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE (Dollars in Thousands Except Per Share Data) Nine Months Ended September 30 ------------------------------ Basic 1999 1998 <F1> ----------- ----------- Net income $ 243,238 $ 203,237 Weighted average number of common shares outstanding 273,565,998 270,908,867 Earnings per common share $ .89 $ .75 =========== =========== Nine Months Ended September 30 ------------------------------ Diluted 1999 1998 <F1> ----------- ----------- Net income $ 243,238 $ 203,237 Add: After tax interest savings on assumed conversion of subordinated debentures and notes - - Dividends paid net of related income tax applicable to restricted stock 466 405 ----------- ----------- Net income, as adjusted $ 243,704 $ 203,642 =========== =========== Weighted average number of common shares outstanding 273,565,998 270,908,867 Weighted average number of incremental shares in connection with restricted stock and assumed exercise of stock options 10,520,233 10,152,302 Assumed conversion of subordinated debentures and notes - 7,094 ----------- ----------- Total 284,086,231 281,068,263 =========== =========== Earnings per common and common equivalent share $ .86 $ .72 =========== =========== Note: The computation of diluted EPS for 1999 excludes the assumed conversion of the 1.87% and 1.80% Convertible Subordinated Notes because they were antidilutive. Similarly, the computation of diluted EPS for 1998 excludes the assumed conversion of the 1.80% Convertible Subordinated Notes as they were antidilutive. <F1> All share data adjusted to reflect two-for-one stock split effective July 15, 1999.