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 March 31 --------------------------- Basic 1999 1998 ---- ---- Net income $ 44,785 $ 37,739 Weighted average number of common shares Outstanding 136,266,930 135,187,048 Earnings per common and common equivalent share $ .33 $ .28 ============ ============ Three Months Ended March 31 ---------------------------- Diluted (1) 1999 1998 ------------ ------------ Net income $ 44,785 $ 37,739 Add: Dividends paid net of related income tax applicable to restricted stock 143 123 ------------ ------------ Net income, as adjusted $ 44,928 $ 37,862 ============ ============ Weighted average number of common shares Outstanding 136,266,930 135,187,048 Weighted average number of incremental shares in connection with restricted stock and assumed exercise of stock options 5,407,842 5,051,940 ------------ ------------ Total 141,674,772 140,238,988 ============ ============ Earnings per common and common equivalent share $ .32 $ .27 ============ ============ (1) The computation of diluted EPS for 1999 and 1998 excludes the assumed conversion of the 1.80% Convertible Subordinated Notes because they were anti-dilutive.