Oakmark Bond

Beta vs. Benchmark

The Beta shown is for the Investor Share Class. Beta is a measure of the magnitude of a portfolio's past share-price fluctuations in relation to the ups and downs of the overall market (or appropriate market index). The market, or index, is assigned a beta of 1.00. A portfolio with a beta of greater than 1 would generally see its share price rise or fall by more than the market, while a portfolio with a beta of less than 1 would have less share price volatility than the market. For Oakmark Equity and Income Fund, beta is measured against the S&P 500 Index. The beta presented is since the inception of each Fund with the exception of The Oakmark International Small Cap Fund, which shows 10-year beta versus the benchmark.

Standard Deviation

The Standard Deviation shown is for the Investor Share Class. Standard Deviation is a measure of the degree to which a fund's return varies from its previous returns, or from the average of all similar funds. The larger the standard deviation, the greater the likelihood (and risk) that a security's performance will fluctuate from the average return. The standard deviation presented is since the inception of the Fund.

30-Day Unsubsidized SEC Yield

Reflects the 30-day yield if the investment advisor were not waiving all or part of its fee or reimbursing the fund for part of its expenses. Total return would have also been lower in the absence of these temporary reimbursements or waivers.

30-Day Subsidized SEC Yield

Duration

Duration is a measure of the sensitivity of bond prices or a bond portfolio to interest rate movements. Stated in years, duration is a weighted measure of the length of time the bond will pay out. Investors use duration to measure the volatility of the bond or a bond portfolio. The shorter the duration (and the less time an investor needs to wait to receive the bond's payments), the less the bond's price will rise or fall in value when interest rates change.

For example, a 3-year duration means a bond will decrease in value by 3% if interest rates rise one percent, or increase in value by 3% if interest rates fall one percent. Duration is affected by maturity, the bond's coupon, and the time interval between payments.