<PAGE>
Filed Pursuant to Rule 497(k)(1)(iii)(B)
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AVERAGE ANNUAL TOTAL RETURNS FOR THE PERIOD ENDING 9/30/99
<TABLE>
<CAPTION>
Since
Fund and Inception Date 1 Year 5 Years Inception
<S> <C> <C> <C>
Oakmark 8/5/91 7.98% 15.10% 22.93%
S&P 500 Index* 27.80% 25.02% 18.53%
</TABLE>
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AVERAGE ANNUAL TOTAL RETURNS FOR THE PERIOD ENDING 9/30/99
<TABLE>
<CAPTION>
Since
Fund and Inception Date 1 Year 5 Years Inception
<S> <C> <C> <C>
Oakmark Select 11/1/96 30.07% n/a 31.12%
S&P 500 Index* 27.80% n/a 24.74%
</TABLE>
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AVERAGE ANNUAL TOTAL RETURNS FOR THE PERIOD ENDING 9/30/99
<TABLE>
<CAPTION>
Since
Fund and Inception Date 1 Year 5 Years Inception
<S> <C> <C> <C>
Oakmark Small Cap 11/1/95 10.56% n/a 13.74%
Russell 2000 Index* 19.07% n/a 11.30%
</TABLE>
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AVERAGE ANNUAL TOTAL RETURNS FOR THE PERIOD ENDING 9/30/99
<TABLE>
<CAPTION>
Since
Fund and Inception Date 1 Year 5 Years Inception
<S> <C> <C> <C>
Oakmark Equity and Income 11/1/95 15.32% n/a 15.39%
Lipper Balanced Fund Index* 13.48% n/a 13.95%
</TABLE>
- -------------------------------------------------------------------------------
AVERAGE ANNUAL TOTAL RETURNS FOR THE PERIOD ENDING 9/30/99
<TABLE>
<CAPTION>
Since
Fund and Inception Date 1 Year 5 Years Inception
<S> <C> <C> <C>
Oakmark International 9/30/92 46.41% 9.35% 13.25%
M.S. World ex U.S. Index* 31.28% 9.26% 11.58%
</TABLE>
- -------------------------------------------------------------------------------
AVERAGE ANNUAL TOTAL RETURNS FOR THE PERIOD ENDING 9/30/99
<TABLE>
<CAPTION>
Since
Fund and Inception Date 1 Year 5 Years Inception
<S> <C> <C> <C>
Oakmark International Small Cap 11/1/95 88.02% n/a 11.72%
M.S. World ex U.S. Index* 31.28% n/a 11.12%
</TABLE>
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