Exhibit 11THE INTERPUBLIC GROUP OF COMPANIES, INC. AND ITS SUBSIDIARIESCOMPUTATION OF EARNINGS PER SHARE (Dollars in Thousands Except Per Share Data) Three Months Ended September 30 Basic 1998 1997 <F1> Net income $ 45,162 $ 31,083 Weighted average number of common shares outstanding 132,792,504 127,078,261 Earnings per common share $ .34 $ .24 Three Months Ended September 30 Diluted 1998 1997 <F1> Net income $ 45,162 $ 31,083 Add: Dividends paid net of related income tax applicable to restricted stock 129 125 Net income, as adjusted $ 45,291 $ 31,208 Weighted average number of common shares outstanding 132,792,504 127,078,261 Weighted average number of incremental shares in connection with restricted stock and assumed exercise of stock options 4,774,537 5,103,420 Total 137,567,041 132,181,681 Earnings per common and common equivalent share $ .33 $ .24 Note: The computation of diluted EPS for 1998 and 1997 excludes the assumed conversion of the Convertible Subordinated Debentures and Notes because they were anti-dilutive. <F1> Restated to reflect the aggregate effect of acquisitions accounted for as poolings of interests. See Note (c). Exhibit 11 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 1998 1997 <F1> Net income $ 197,355 $ 153,734 Weighted average number of common shares outstanding 132,704,118 126,991,427 Earnings per common share $ 1.49 $ 1.21 Nine Months Ended September 30 Diluted 1998 1997 <F1> Net income $ 197,355 $ 153,734 Add: After tax interest savings on assumed conversion of subordinated debentures and notes - 5,192 Dividends paid net of related income tax applicable to restricted stock 405 331 Net income, as adjusted $ 197,760 $ 159,257 Weighted average number of common shares outstanding 132,704,118 126,991,427 Weighted average number of incremental shares in connection with restricted stock and assumed exercise of stock options 5,076,151 4,486,147 Assumed conversion of subordinated debentures and notes 3,547 4,807,874 Total 137,783,816 136,285,448 Earnings per common and common equivalent share $ 1.44 $ 1.17 Note: The computation of diluted EPS for 1998 excludes the assumed conversion of the 1.8% Convertible Subordinated Notes because they were anti-dilutive. <F1> Restated to reflect the aggregate effect of acquisitions accounted for as poolings of interests. See Note (c).