EXHIBIT 11
PAGE 1 OF 2
THE INTERPUBLIC GROUP OF COMPANIES, INC. AND ITS SUBSIDIARIES
COMPUTATION OF EARNINGS PER SHARE
(AMOUNTS IN THOUSANDS EXCEPT PER SHARE DATA)
<Table>
<Caption>
THREE MONTHS ENDED JUNE 30,
---------------------------
2001 2000
---- ----
BASIC
Net income (loss) $(110,158) $166,361
========= ========
Weighted average number of common shares Outstanding 368,911 356,680
========= ========
Earnings (loss) per common and common equivalent share $ (.30) $ .47
========= ========
</Table>
<Table>
<Caption>
THREE MONTHS ENDED JUNE 30,
---------------------------
2001 2000
---- ----
DILUTED (1)
Net income (loss) $(110,158) $166,361
Add:
After tax savings on assumed conversion
of subordinated debentures and notes -- 4,614
Dividends paid net of related income tax
applicable to restricted stock -- 173
--------- --------
Net income (loss), as adjusted $(110,158) $171,148
========= ========
Weighted average number of common shares Outstanding 368,911 356,680
Weighted average number of incremental shares
in connection with restricted stock
and assumed exercise of stock options -- 11,136
Assumed conversion of subordinated debentures and notes -- 13,053
--------- --------
Total 368,911 380,869
========= ========
Earnings (loss) per common and common equivalent share $ (.30) $ .45
========= ========
</Table>
(1) The computation of diluted EPS for 2001 excludes the assumed conversion of
the 1.80% and 1.87% Convertible Subordinated Notes, and the conversion of
restricted stock and assumed exercise of stock options because they were
antidilutive.
1
<Page>
EXHIBIT 11
PAGE 2 OF 2
THE INTERPUBLIC GROUP OF COMPANIES, INC. AND ITS SUBSIDIARIES
COMPUTATION OF EARNINGS PER SHARE
(AMOUNTS IN THOUSANDS EXCEPT PER SHARE DATA)
<Table>
<Caption>
SIX MONTHS ENDED JUNE 30
------------------------
2001 2000
---- ----
BASIC:
Net income (loss) $(138,829) $216,295
Weighted average number of common shares outstanding 367,520 356,148
Earnings (loss) per common share $ (.38) $ .61
========= ========
</Table>
<Table>
<Caption>
SIX MONTHS ENDED JUNE 30
------------------------
2001 2000
---- ----
DILUTED:
Net income (loss) $(138,829) $216,295
Add:
After tax savings on assumed
conversion of subordinated debentures and notes -- --
Dividends paid net of related income tax
applicable to restricted stock -- 335
--------- --------
Net income (loss), as adjusted $(138,829) $216,630
========= ========
Weighted average number of common shares outstanding 367,520 356,148
Weighted average number of incremental shares in connection with
restricted stock and assumed exercise of stock options -- 11,776
Assumed conversion of subordinated debentures and notes -- --
--------- --------
Total 367,520 367,924
========= ========
Earnings (loss) per common and common equivalent share $ (.38) $ .59
========= ========
</Table>
(1) The computation of diluted EPS for 2001 and 2000 excludes the assumed
conversion of the 1.87% and 1.8% Convertible Subordinated Notes, and for
2001 excludes the conversion of restricted stock and assumed exercise of
stock options because they were anti-dilutive.
2