Performance data shown represents past performance, which is no guarantee of future results. Current performance may be higher or lower than the past performance data shown. Investment returns and the value of an investment will fluctuate, and an investor's shares, when sold, may be worth more or less than their original cost. You can obtain performance data current to the most recent month-end (available within seven business days after the most recent month-end) by calling 800-422-1050 or visiting harborfunds.com.

The Harbor Funds performance shown assumes the reinvestment of dividend and capital gain distributions and is net of management fees and expenses. Returns for periods less than one year are not annualized.

From time to time, certain fees and/or expenses have been voluntarily or contractually waived or reimbursed, which has resulted in higher returns. Without these waivers or reimbursements, the returns would have been lower. Voluntary waivers or reimbursements may be applied or discontinued at any time without notice. Only the Board of Trustees may modify or terminate contractual fee waivers or expense reimbursements.

There is no guarantee that the investment objective of the Fund will be achieved. Stock markets are volatile and equity values can decline significantly in response to adverse issuer, political, regulatory, market and economic conditions. Stocks of mid cap companies pose special risks, including possible illiquidity and greater price volatility than stocks of larger, more established companies.

The Russell Midcap® Index is an unmanaged index generally representative of the U.S. market for medium capitalization stocks. This unmanaged index does not reflect fees and expenses and is not available for direct investment. The Russell Midcap® Index and Russell® are trademarks of Frank Russell Company.