Calvert Mid Cap Value Fund (CMVAX)

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Modern Portfolio Theory Statistics^* as of 12/31/2009

Glossary of Terms:

In Modern Portfolio Theory statistical calculations are applied to an investment strategy to seek to construct an optimal portfolio by considering the relationship between risk and return.

Alpha is a measure of the difference between a fund's actual returns and its expected performance, given its level of risk as measured by beta. A positive alpha figure indicates the fund has performed better than its beta would predict. In contrast, a negative alpha indicates the fund's underperformance, given the expectations established by the fund's beta.

Beta is a measure of portfolio risk relative to the market or benchmark. A portfolio beta of 1.0 indicates a risk level equal to that of the fund's benchmark.

R-Squared is a statistical measure that represents the percentage of a fund's or security's movements that can be explained by movements in a benchmark index. R-squared values range from 0 to 100 percent. An R-squared of 100 percent means that all movements of a security are completely explained by movements in the index. A high R-squared (between 85 and 100 percent) indicates the fund's performance patterns have been in line with the index. A fund with a low R-squared (70 percent or less) doesn't act much like the index. A higher R-squared value will indicate a more useful beta figure. For example, if a fund has an R-squared value of close to 100 percent but has a beta below 1, it is most likely offering higher risk-adjusted returns.

Sharpe Ratio is calculated by using standard deviation and excess return to determine reward per unit of risk. The higher the Sharpe ratio, the better the fund's historical risk-adjusted performance.

Standard Deviation is a useful measure of a fund's risk. For example, a fund with a standard deviation of 10 can be expected to produce an annual return that is within 10 percentage points (plus or minus) of its average annual return two-thirds of the time.

Excess Return is return in excess of the risk-free rate or in excess of a benchmark.

Information Ratio is a measure of the consistency of excess return of a mutual fund as compared to its benchmark. The higher the Information Ratio of a Fund, the higher the active return of the Fund, given the amount of risk involved, and the more consistently the Fund manager beats the Fund's benchmark. 

Net expense ratio reflects contractual fee waiver and/or expense reimbursement through January 31, 2010.

Holdings are subject to change.

Annual fund operating expenses are based on expenses for the Fund's most recent fiscal year unless otherwise noted.

Calvert has agreed contractually to limit direct ordinary operating expenses for Calvert Mid Cap Value Fund through January 31, 2010. Direct ordinary operating expenses will not exceed 1.59% for Class A shares and 2.59% for Class C shares of the Fund. Only the Board of Trustees of the Fund may terminate the Fund’s expense cap during the contractual period. Under the terms of the contractual expense limitation, operating expenses do not include interest expense, brokerage commissions, extraordinary expenses and taxes.

Management fees include the advisory fee paid by the Fund to the Advisor, and the administrative fee paid by the Fund to Calvert Administrative Services Company, an affiliate of the Advisor.