Performance data shown represents past performance and is no guarantee of future results. Past performance is net of management fees and expenses and reflects reinvested dividends and distributions. Past performance reflects the beneficial effect of any expense waivers or reimbursements, without which returns would have been lower. Investment returns and principal value will fluctuate and when redeemed may be worth more or less than their original cost. Returns for periods less than one year are not annualized. Current performance may be higher or lower and is available through the most recent month end at harborfunds.com or by calling 800-422-1050.

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.

The Harbor Target Retirement Income Fund is designed for investors currently in retirement, and its investments are expected to remain stable over time. The other Harbor Target Retirement Funds are designed for investors who plan to retire close to the year indicated in the Funds’ names. These Funds’ asset allocations will change over time and become more conservative as time elapses. The principal value of the Funds is not guaranteed at any time, including the target retirement date.

There is no guarantee that the investment objective of the Fund will be achieved. The principal value of the Fund is not guaranteed at any time, including the target date. The performance and risks of the Fund correspond directly to the performance and risks of the underlying Harbor funds in which the Fund invests. The Fund has partial exposure to the risks of many different market sectors and asset classes, any of which could cause an investor to lose money. The principal risk of the Fund is asset allocation risk, or the risk that the selection of the underlying Harbor funds and the allocation of the Fund's assets to those underlying Harbor funds will cause the Fund to underperform other similar target retirement funds. Other principal risks include selection risk (a subadviser of one of the underlying Harbor funds is incorrect in its judgment regarding the attractiveness, value and potential appreciation of a particular security) and market risk. A fund with significant exposure to equity securities is also subject to risks associated with investing in stocks which may fluctuate in price if affected by issuer-specific events and movements in the overall stock market in which those securities trade. A fund with significant exposure to international markets poses special risks including potentially greater price volatility due to social, political and economic factors, as well as currency exchange rate fluctuations. A fund with significant exposure to fixed income securities is also subject to risks associated with investing in fixed income securities which may fluctuate in price in response to changes in interest rates, market conditions and issuer-specific events.

The MSCI EAFE (ND) Index is an unmanaged index generally representative of major overseas stock markets. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Bloomberg Barclays U.S. Aggregate Bond Index is an unmanaged index of investment-grade fixed-rate debt issues with maturities of at least one year. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Russell 3000® Index is an unmanaged index that measures the performance of the largest 3000 U.S. companies representing approximately 98% of the investable U.S. equity market. The Russell 3000® Index is constructed to provide a comprehensive, unbiased and stable barometer of the broad market and is completely reconstituted annually to ensure new and growing equities are reflected. This unmanaged index does not reflect fees and expenses and is not available for direct investment. The Russell 3000® Index and Russell® are trademarks of Frank Russell Company.

The Composite Index 2035 is derived by applying the Harbor Target Retirement 2035 Fund’s (the “2035 Fund”) target asset allocation to the results of the underlying funds’ benchmarks: Russell 1000® Growth Index, Russell Midcap® Growth Index, Russell 2000® Growth Index, Russell 1000® Value Index, Russell Midcap® Value Index, Russell 2000® Value Index, MSCI EAFE (ND) Index, MSCI All Country World Ex. U.S. (ND) Index (with respect to Harbor International Growth Fund weightings, prior to May 28, 2013, the MSCI EAFE Growth (ND) Index), MSCI All Country World (ND) Index, ICE BofAML U.S. High Yield Index (H0A0), ICE BofAML U.S. Non-Distressed High Yield Index (with respect to the Harbor High-Yield Bond Fund; prior to March 31, 2015, the ICE BofAML U.S. High Yield Index (H0A0) was this fund’s benchmark and a component of the Composite Index), Bloomberg Barclays U.S. Aggregate Bond Index, Bloomberg Barclays U.S. TIPS Index. The weights of the Composite Index 2035 match the 2035 Fund’s historical target asset allocation and are adjusted as changes are made to this asset allocation. Refer to the Target Retirement Funds Prospectus for the 2035 Fund’s target asset allocation. This unmanaged index does not reflect fees and expenses and is not available for direct investment.