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.

The current yield more closely reflects the current earnings of the Harbor Money Market Fund than the total return. Current yield is annualized and excludes gains and losses as defined by the Securities and Exchange Commission.

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.

You could lose money by investing in the Harbor Money Market Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not insured or guaranteed by the FDIC or any other government agency. The Fund's sponsor has no legal obligation to provide financial support to the Fund and you should not expect the sponsor to provide financial support to the Fund at any time.

CUSIP identifiers have been provided by CUSIP Global Services, managed on behalf of the American Bankers Association by S&P Global Market Intelligence LLC, and are not for use or dissemination in a manner that would serve as a substitute for any CUSIP service. The CUSIP Database, © 2019 American Bankers Association. CUSIP is a registered trademark of the American Bankers Association.

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.

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

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.

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

The Russell 1000® Growth Index is an unmanaged index generally representative of the U.S. market for larger capitalization growth stocks. This unmanaged index does not reflect fees and expenses and is not available for direct investment. The Russell 1000® Growth Index and Russell® are trademarks of Frank Russell Company.

The Russell 1000® Value Index is an unmanaged index generally representative of the U.S. market for larger capitalization value stocks. This unmanaged index does not reflect fees and expenses and is not available for direct investment. The Russell 1000® Value Index and Russell® are trademarks of Frank Russell Company.

The Russell 2000® Growth Index is an unmanaged index representing the smallest 2000 stocks with the highest price-to-book ratio and future earnings. This unmanaged index does not reflect fees and expenses and is not available for direct investment. The Russell 2000® Growth Index and Russell® are trademarks of Frank Russell Company.

The Russell 2000® Value Index is an unmanaged index representing the smallest 2000 stocks with the lowest price-to-book ratio and future earnings. This unmanaged index does not reflect fees and expenses and is not available for direct investment. The Russell 2000® Value Index and Russell® are trademarks of Frank Russell Company.

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 ICE BofAML US 3-Month Treasury Bill Index is comprised of a single U.S. Treasury Bill issue purchased at the beginning of each month and held for a full month, at which time that issue is sold and rolled into a newly selected issue. The issue selected each month is that having a maturity date closest to, but not beyond 90 days from the rebalance date.

The ICE BofAML US High Yield Index (H0A0) Index is an unmanaged index that tracks the performance of below investment grade U.S. Dollar-denominated corporate bonds publicly issued in the U.S. domestic market. All bonds are U.S. dollar denominated and rated Split BBB and below. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The ICE BofAML US Non-Distressed High Yield Index is a subset of the ICE BofAML US High Yield Index (H0A0) including all securities with an option-adjusted spread less than 1,000 basis points. The ICE BofAML US High Yield Index (H0A0) is an unmanaged index that tracks the performance of below investment grade U.S. Dollar-denominated corporate bonds publicly issued in the U.S. domestic market. All bonds are U.S. Dollar-denominated and rated Split BBB and below. These unmanaged indices do not reflect fees and expenses and are not available for direct investment.

The ICE BofAML US Convertible Ex Mandatory Index is broadly representative of the U.S. convertible securities market, consisting of publicly traded issues, denominated in U.S. Dollars, of all credit qualities, and excluding mandatory (equity-linked) convertibles. 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 MSCI Emerging Markets (ND) Index is a market capitalization weighted index of equity securities in more than 20 emerging market economies. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Composite Index 2060 is derived by applying the Harbor Target Retirement 2060 Fund’s (the “2060 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), Bloomberg Barclays U.S. Aggregate Bond Index. The weights of the Composite Index 2060 match the 2060 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 2055 Fund’s target asset allocation. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Composite Index 2055 is derived by applying the Harbor Target Retirement 2055 Fund’s (the “2055 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), Bloomberg Barclays U.S. Aggregate Bond Index. The weights of the Composite Index 2055 match the 2055 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 2055 Fund’s target asset allocation. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Composite Index 2050 is derived by applying the Harbor Target Retirement 2050 Fund’s (the “2050 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), Bloomberg Barclays U.S. Aggregate Bond Index. The weights of the Composite Index 2050 match the 2050 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 2050 Fund’s target asset allocation. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Composite Index 2045 is derived by applying the Harbor Target Retirement 2045 Fund’s (the “2045 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. The weights of the Composite Index 2045 match the 2045 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 2045 Fund’s target asset allocation. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Composite Index 2040 is derived by applying the Harbor Target Retirement 2040 Fund’s (the “2040 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. The weights of the Composite Index 2040 match the 2040 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 2040 Fund’s target asset allocation. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

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.

The Composite Index 2030 is derived by applying the Harbor Target Retirement 2030 Fund’s (the “2030 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 2030 match the 2030 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 2030 Fund’s target asset allocation. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Composite Index 2025 is derived by applying the Harbor Target Retirement 2025 Fund’s (the “2025 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 2025 match the 2025 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 2025 Fund’s target asset allocation. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Composite Index 2020 is derived by applying the Harbor Target Retirement 2020 Fund’s (the “2020 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, ICE BofAML U.S. 3-Month Treasury Bill Index. The weights of the Composite Index 2020 match the 2020 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 2020 Fund’s target asset allocation. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The Composite Index Income is derived by applying the Harbor Target Retirement Income Fund’s (the “Income 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, 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 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, ICE BofAML 3-Month U.S. Treasury Bill Index. The weights of the Composite Index Income match the Income Fund’s historical target asset allocation and are adjusted as changes are made to this asset allocation.

The MSCI EAFE Small Cap (ND) Index is an equity index which captures small cap representation across developed market countries around the world, excluding the U.S. and Canada. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

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 MSCI All Country World Index (ND) is a free float-adjusted market capitalization weighted index that is designed to measure the equity market performance of developed and emerging markets. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The MSCI All Country World Ex. US (ND) Index is a free float-adjusted market capitalization weighted index that is designed to measure equity market performance in the global developed and emerging markets, excluding the U.S. This unmanaged index does not reflect fees and expenses and is not available for direct investment.

The S&P 500 Index is an unmanaged index generally representative of the U.S. market for large capitalization equities. This unmanaged index does not reflect fees and expenses and is not available for direct investment.