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After-Tax Returns

William Blair Family of Funds After-Tax Returns - N
   (For the Period ending 12/31/2007)
Domestic Equity Funds1 Yr.5 Yrs.10 Yrs.Life of Fund*
Growth Fund  
  Return Before Taxes: 13.17% 13.14% 5.31% --
  After Taxes on Distributions: 11.48% 12.08% 4.02% --
  After Taxes on Distributions
  and Sale of Fund Shares:
10.58% 11.19% 4.35% --
Tax-Managed Growth Fund  
  Return Before Taxes: 9.96% 11.89% -- 2.33%
  After Taxes on Distributions: 9.96% 11.89% -- 2.33%
  After Taxes on Distributions
  and Sale of Fund Shares:
5.55% 10.41% -- 2.01%
Large Cap Growth Fund  
  Return Before Taxes: 9.30% 9.39% -- -3.48%
  After Taxes on Distributions: 9.30% 9.39% -- -3.48%
  After Taxes on Distributions
  and Sale of Fund Shares:
6.05% 8.18% -- -2.91%
Small Cap Growth Fund  
  Return Before Taxes: -2.15% 18.40% -- 16.03%
  After Taxes on Distributions: -3.73% 16.99% -- 15.02%
  After Taxes on Distributions
  and Sale of Fund Shares:
-0.86% 15.87% -- 14.06%
Mid Cap Growth Fund  
  Return Before Taxes: 14.62% -- -- 9.93%
  After Taxes on Distributions: 13.23% -- -- 9.24%
  After Taxes on Distributions
  and Sale of Fund Shares:
10.25% -- -- 8.26%
Small-Mid Cap Growth Fund  
  Return Before Taxes: 12.34% -- -- 11.32%
  After Taxes on Distributions: 10.13% -- -- 10.55%
  After Taxes on Distributions
  and Sale of Fund Shares:
9.73% -- -- 9.67%
Value Discovery Fund  
  Return Before Taxes: -5.54% 12.53% 9.16% --
  After Taxes on Distributions: -12.34% 8.91% 7.21% --
  After Taxes on Distributions
  and Sale of Fund Shares:
-1.73% 10.01% 7.56% --
International Equity Funds1 Yr.5 Yrs.10 Yrs.Life of Fund*
International Growth Fund  
  Return Before Taxes: 18.13% 24.40% 15.93% --
  After Taxes on Distributions: 15.91% 23.20% 14.38% --
  After Taxes on Distributions
  and Sale of Fund Shares:
13.98% 21.49% 13.67% --
International Equity Fund  
  Return Before Taxes: 17.68% -- -- 17.93%
  After Taxes on Distributions: 15.89% -- -- 17.28%
  After Taxes on Distributions
  and Sale of Fund Shares:
12.76% -- -- 15.43%
International Small Cap Growth Fund  
  Return Before Taxes: 13.06% -- -- 21.22%
  After Taxes on Distributions: 11.31% -- -- 20.29%
  After Taxes on Distributions
  and Sale of Fund Shares:
9.61% -- -- 18.00%
Emerging Markets Growth Fund  
  Return Before Taxes: 37.75% -- -- 47.18%
  After Taxes on Distributions: 32.37% -- -- 44.83%
  After Taxes on Distributions
  and Sale of Fund Shares:
27.59% -- -- 40.72%
Global Funds1 Yr.5 Yrs.10 Yrs.Life of Fund*
Global Growth Fund  
  Return Before Taxes: -- -- -- -1.10%
  After Taxes on Distributions: -- -- -- --
  After Taxes on Distributions
  and Sale of Fund Shares:
-- -- -- --
Fixed Income Funds1 Yr.5 Yrs.10 Yrs.Life of Fund*
Bond Fund  
  Return Before Taxes: -- -- -- 3.38%
  After Taxes on Distributions: -- -- -- --
  After Taxes on Distributions
  and Sale of Fund Shares:
-- -- -- --
Income Fund  
  Return Before Taxes: 1.08% 2.66% 4.54% --
  After Taxes on Distributions: -0.95% 0.78% 2.42% --
  After Taxes on Distributions
  and Sale of Fund Shares:
0.70% 1.17% 2.59% --

*The Funds’ dates of inception were as follows: Tax-Managed Growth, Large Cap Growth and Small Cap Growth, December 27, 1999; International Growth, October 1, 1992; Value Discovery, December 23, 1996.

Past performance does not guarantee future results. Returns shown are average annual total returns, which assume reinvestment of dividends and capital gains. Investment returns and principal will fluctuate and you may have a gain or loss when you sell shares.

From time to time, the investment adviser may waive fees or reimburse expenses for the Tax-Managed Growth, Large Cap Growth, Small Cap Growth and Value Discovery Funds. Without these waivers, performance would be lower.

William Blair Funds past performance, before and after taxes, does not guarantee future results. After-tax returns are calculated using the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
 
An investment in the Ready Reserves Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund.

International investing involves special risk considerations, includingcurrency fluctuations, lower liquidity, economic and political risk.

Investments in initial public offerings (IPOs) during favorable market conditions have significantly contributed to the Emerging Markets Growth Fund's performance since its inception.  As the Fund grows in size or as market conditions for IPOs become less favorable, the impact of IPOs is likely to diminish.


Investing in smaller companies involves special risks, including higher volatility and lower liquidity.Although initial public offerings (IPOs) had an insignificant effect on the Small Cap Growth Fund's Year-to-Date and One-Year performance during 2001, the Fund's performance during 2000 was primarily attributable to investments in IPOs during a rising market. As the Fund grows, the impact of IPOs is likely to diminish.