485APOS

Harbor Active Commodity ETF

Fund Summary

Investment Objective

The Fund seeks total return.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Management Fees	[XX]%
Distribution and Service (12b-1) Fees	[XX]
Other Expenses1,2	[XX]%
Total Annual Fund Operating Expenses	[XX]%

1 Pursuant to the Investment Advisory Agreement, the Advisor pays all of the operating expenses of the Fund (inclusive of any expenses of a wholly owned subsidiary of the Fund), except for (i) the fee payment under the Investment Advisory Agreement; (ii) payments under the Fund’s 12b-1 plan (if any); (iii) the costs of borrowing, including interest and dividend expenses; (iv) taxes and governmental fees; (v) acquired fund fees and expenses; (vi) brokers’ commissions and any other transaction-related expenses and fees arising out of transactions effected on behalf of the Fund; (vii) costs of holding shareholder meetings; and (viii) litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of the Fund’s business.

2 “Other Expenses” are estimated for the current fiscal year.

Expense Example

This Expense Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other exchange-traded funds. The Expense Example assumes that you invest $10,000 in the Fund for the time periods indicated. The Expense Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, under these assumptions, your costs would be:

One Year	Three Years
$[XX]	$[XX]

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities or other financial instruments (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Expense Example, do affect the Fund’s performance. The Fund had not commenced operations as of the date of this Prospectus and no portfolio turnover rate existed at the time of this publication.

Principal Investment Strategy

The Fund seeks to provide exposure to commodities markets through actively managed investments in commodities instruments, including futures contracts whose values are linked to commodities or commodity indices, options on commodity futures contracts, over-the-counter swaps whose underlying components are comprised of commodity derivatives or reference commodity derivatives, or other commodity-linked derivative instruments (“Commodities Instruments”). The Fund may invest, either directly or through its Subsidiary (as defined below) in a range of Commodities Instruments and markets as determined by Quantix Commodities LP (the “Subadviser”), the Fund’s investment subadviser. Under normal circumstances, the Fund invests at least 80% of its net assets, plus borrowings for investment purposes, in instruments that provide exposure to commodities. The Fund typically invests in Commodities Instruments denominated in U.S. dollars and traded on U.S. and U.K. exchanges. The Subadviser, on behalf of the Fund, may also engage in trading on other commodity exchanges outside of the U.S. and U.K., and the Fund may have exposure to investments denominated in non-U.S. currencies.

The Subadviser takes various factors into account in its investment process, such as (without limitation) proprietary model outputs, market conditions, and the relative cost of holding a “rolling” futures position (as described below), as well as the diversification and overall risk properties of the portfolio. The Subadvisor generally targets commodities with high expected inflation sensitivity and a low cost of carry in constructing the Fund’s portfolio. The Subadviser typically evaluates sensitivity to inflation by considering the extent to which increased prices of raw materials (like agricultural products, oil or metals) are passed on to consumers in the prices of finished goods and services. Those commodities with higher pass-through costs are considered more sensitive to inflation. The Subadviser typically combines inflation sensitivity with other factors, such as roll yields. Roll yield is the gain or loss that comes from “rolling” a futures position from a contract that is about to expire into a contract with a later date. If the price for the new futures contract is lower than the price of the expiring contract, then the market for the commodity is said to be in “backwardation.” In these markets, roll returns are positive. The term “contango” is used to describe a market in which the price for a new futures contract is higher than the price of the expiring contract. In these markets, roll returns are negative, which may result in a loss to the Fund. The Subadviser’s investment process also determines the weight of debasement commodities (the price of which is driven primarily by weakening currency), such as gold, relative to scarcity commodities (the price of which is primarily driven by the commodity itself), to incorporate the macroeconomic environment. The Subadviser’s Fund portfolio construction process will generally result in the Fund having diversified, long-only or long-biased exposure to commodities. In constructing the Fund’s portfolio, the Subadviser generally invests in a universe of commodities which largely consist of liquid exchange-traded contracts. As a result of the Fund’s strategy, the Fund may have significant exposure to particular sectors or commodities at times.

As collateral for the Fund’s derivatives holdings or to generate interest income and capital appreciation on the cash balances arising from its use of derivatives, the Fund will invest primarily in U.S. Treasury bills.

The Fund will invest up to 25% of its total assets, as determined at the end of each fiscal quarter, in a wholly owned and controlled subsidiary (the “Subsidiary”) organized under the laws of the

Fund Summary

Harbor Active Commodity ETF

Cayman Islands. The Fund’s investment in the Subsidiary is expected to provide the Fund with exposure to commodity returns within the limits of the federal tax laws, which limit the ability of investment companies such as the Fund to invest directly in such instruments. The Subsidiary has the same investment objective and will follow the same general investment policies and restrictions as the Fund. Unlike the Fund, the Subsidiary may invest without limitation in Commodities Instruments. Except as noted, references to the Fund’s investment strategies and risks include those of its Subsidiary. The Subsidiary is advised by Harbor Capital Advisors, Inc. (“Harbor Capital” or the “Advisor”) and subadvised by the Subadvisor.

While the Fund does not engage in borrowing for investment purposes, the Commodities Instruments in which the Fund invests are inherently leveraged so that small changes in the underlying commodity prices result in disproportionate changes in the value of the instruments. Such investments will therefore have a leveraging effect on the Fund’s portfolio. Neither the Fund nor any of the Subsidiaries is expected to invest directly in any physical commodities.

The Fund is classified as non-diversified, which means the Fund may invest in the securities of a smaller number of issuers than a diversified fund.

Principal Risks

Investors considering an investment in the Fund should be prepared to accept significant volatility in the Fund’s performance, particularly over shorter time periods. The Fund is not intended to serve as a core holding in an investor’s portfolio but instead should represent only a small portion of an investor’s overall diversified portfolio. Investors considering an investment in this Fund should be sure they carefully read and understand the investment strategies employed and the heightened risks associated with those strategies.

There is no guarantee that the investment objective of the Fund will be achieved. Commodities and commodity-linked derivative instruments can be significantly more volatile than other investments, such as stocks or bonds. The value of your investment in the Fund may go down, which means that you could lose money on your investment in the Fund or the Fund may not perform as well as other possible investments. Principal risks impacting the Fund (in alphabetical order after the first [6]) include:

Commodity Risk: The Fund has exposure to commodities through investments (either directly or through the Subsidiary) in commodity-linked derivative instruments. Commodity prices are generally affected by, among other factors, the cost of producing, transporting and storing commodities, changes in consumer or commercial demand for commodities, the hedging and trading strategies of producers and consumers of commodities, speculative trading in commodities by commodity pools and other market participants, disruptions in commodity supply, weather, political and other global events, global economic factors and government intervention in or regulation of the commodity or commodity futures markets. The Fund may concentrate its assets in a particular sector of the commodities market (such as oil, metal or agricultural products). As a result, the Fund may be more susceptible to risks associated with those sectors.

Commodity Futures Contract Risk: Like investments in other commodity-linked derivative instruments, investments in commodity futures contracts may subject the Fund to significantly greater volatility than investments in traditional securities. If all or a significant portion of the futures contracts were to reach a negative price, you could lose your entire investment. Each trading facility on which the commodity futures contracts are traded has the right to suspend or limit trading in the instruments that it lists. Certain

of the futures contracts in which the Fund may invest trade on non-U.S. exchanges that impose different requirements than U.S. exchanges. These futures contracts may be subject to additional risks, including greater price volatility, temporary price aberrations and the potential imposition of limits that constrain appreciation or cause depreciation of the prices of such futures contracts, as well as different and longer settlement periods. As futures contracts approach expiration, they may be replaced by similar contracts that have a later expiration through “rolling.” If the market for these contracts is in “contango,” meaning that the prices of futures contracts in the nearer months are lower than the prices of contracts in the distant months, the sale of the near-term month contract would be at a lower price than the longer-term contract, resulting in a cost to “roll” the futures contract that may negatively impact returns.

Commodity-Linked Derivatives Risk: The Fund’s investments in commodity-linked derivative instruments (either directly or through the Subsidiary) may subject the Fund to significantly greater volatility than investments in traditional securities. The value of commodity-linked derivative instruments may be affected by prevailing spot prices (the price at which a commodity can be bought or sold for immediate delivery) for the underlying commodity, supply and demand, market activity, liquidity, economic, financial, political regulatory, geographical, biological or judicial events, and the general interest rate environment. Commodity-linked derivatives are subject to the risk that the counterparty to the transaction, the exchange or trading facility on which they trade, or the applicable clearing house may default or otherwise fail to perform. The Fund will incur certain costs as a result of its use of derivatives and is required to post margin in respect to certain of its holdings in derivatives. Costs incurred by the Fund as a result of its use of derivatives will ultimately be borne by shareholders.

The Fund’s use of commodity-linked derivatives will have a leveraging effect on the Fund’s portfolio. Leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the Fund otherwise would have had. The Fund’s exposure to leverage can substantially increase the adverse impact to which the Fund’s investment portfolio may be subject and make the Fund more volatile.

Authorized Participant Concentration/Trading Risk: Only authorized participants (“APs”) may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of institutions that may act as APs and such APs have no obligation to submit creation or redemption orders. Consequently, there is no assurance that APs will establish or maintain an active trading market for the shares. This risk may be heightened to the extent that securities or other financial instruments held by the Fund are traded outside a collateralized settlement system. In that case, APs may be required to post collateral on certain trades on an agency basis (i.e., on behalf of other market participants), which only a limited number of APs may be able to do. In addition, to the extent that APs exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other AP is able to step forward to create or redeem Creation Units (as defined below), this may result in a significantly diminished trading market for shares, and shares may be more likely to trade at a premium or discount to the Fund’s net asset value and to face trading halts and/or delisting. This risk may be heightened during periods of volatility or market disruptions.

Cash Transactions Risk: The Fund will effect some or all of its creations and redemptions for cash rather than in-kind. As a result,

Fund Summary

Harbor Active Commodity ETF

an investment in the Fund may be less tax-efficient than an investment in an ETF that effects all of its creations and redemptions in-kind. Because the Fund may effect redemptions for cash, it may be required to sell portfolio securities or other financial instruments in order to obtain the cash needed to distribute redemption proceeds. A sale of portfolio securities or other financial instruments may result in capital gains or losses and may also result in higher brokerage costs. To the extent costs are not offset by transaction fees charged by the Fund to APs, the costs of cash transactions will be borne by the Fund.

Premium/Discount Risk: The market price of the Fund’s shares will generally fluctuate in accordance with changes in the Fund’s net asset value as well as the relative supply of and demand for shares on the Exchange. The Advisor cannot predict whether shares will trade below, at or above their net asset value because the shares trade on the Exchange at market prices and not at net asset value. Price differences may be due, in large part, to the fact that supply and demand forces at work in the secondary trading market for shares will be closely related, but not identical, to the same forces influencing the prices of the holdings of the Fund trading individually or in the aggregate at any point in time. This may result in the Fund’s shares trading significantly above (premium) or below (discount) the Fund’s net asset value, which will be reflected in the intraday bid/ask spreads and/or the closing price of shares as compared to net asset value. During stressed market conditions, the market for the Fund’s shares may become less liquid in response to deteriorating liquidity in the market for the Fund’s underlying portfolio holdings, which could in turn lead to differences between the market price of the Fund’s shares and their net asset value.

Counterparty Risk: A counterparty, including a counterparty to an over-the-counter derivative instrument, may be unwilling or unable to meet its contractual obligations. If the counterparty or its affiliate becomes insolvent, bankrupt or defaults ion its payment obligations to the Fund, the value of an investment held by the Fund may decline. The Fund may also not be able to exercise remedies, such as the termination of transactions, netting of obligations and realization on collateral if such remedies are stayed or eliminated under special resolutions adopted in the United States or other jurisdictions.

In addition, the Fund may enter into swap agreements with a limited number of counterparties, which may increase the Fund’s exposure to counterparty credit risk. Counterparties may be less willing to enter into transactions in stressed or volatile market conditions or may alter the terms they are willing to accept in such conditions. Further, there is a risk that no suitable counterparties will be willing to enter into, or continue to enter into, transactions with the Fund, which may cause the Fund not to be able to achieve its investment objective or to change its investment objective.

Foreign Currency Risk: As a result of the Fund’s investments in securities or other financial instruments denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected.

Interest Rate Risk: As interest rates rise, the values of fixed income securities held by the Fund are likely to decrease and reduce the value of the Fund’s portfolio. Securities with longer durations tend to be more sensitive to changes in interest rates and are usually more volatile than securities with shorter durations. For example, a 5 year average duration generally means the price of a fixed income security will decrease in value by 5% if interest rates rise

by 1%. Rising interest rates may lead to increased redemptions, increased volatility and decreased liquidity in the fixed income markets, making it more difficult for the Fund to sell its fixed income securities when the Subadvisor may wish to sell or must sell to meet redemptions. During periods when interest rates are low or there are negative interest rates, the Fund’s yield (and total return) also may be low or the Fund may be unable to maintain positive returns or minimize the volatility of the Fund’s net asset value per share. Changing interest rates may have unpredictable effects on the markets, may result in heightened market volatility and may detract from Fund performance. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates.

Market Risk: Securities markets are volatile and can decline significantly in response to adverse market, economic, political, regulatory or other developments, which may lower the value of securities or other financial instruments held by the Fund, sometimes rapidly or unpredictably. Events such as war, acts of terrorism, social unrest, natural disasters, recessions, inflation, rapid interest rate changes, supply chain disruptions, sanctions, the spread of infectious illness or other public health threats could also significantly impact the Fund and its investments.

New Fund Risk: There can be no assurance that the Fund will grow to or maintain an economically viable size, in which case the Board of Trustees may determine to liquidate the Fund. The Board of Trustees may liquidate the Fund at any time in accordance with the Declaration of Trust and governing law. As a result, the timing of the Fund’s liquidation may not be favorable.

Non-Diversification Risk: Because the Fund is non-diversified and may invest a greater percentage of its assets in securities of a single issuer, and/or invest in a relatively small number of issuers, it is more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio.

Precious Metals Investment Risk: Prices of precious metals, including gold and silver, and of precious metal-related financial instruments historically have been very volatile and may fluctuate sharply over short periods of time. The high volatility of precious metals prices may adversely affect the prices of financial instruments that derive their value from the price of underlying precious metals. The production and sale of precious metals by governments or central banks or other larger holders can be affected by various economic, financial, social and political factors, which may be unpredictable and may have a significant impact on the prices of precious metals.

Sector Risk: To the extent that the Fund has significant exposure to a particular sector or commodity, the Fund will be subject to the risk that economic, political or other conditions that have a negative effect on that sector or commodity will negatively impact the Fund to a greater extent than if the Fund’s assets were invested in a wider variety of sectors or commodities.

Selection Risk: The Subadvisor’s judgment about the attractiveness, value and growth potential of a particular security or financial instrument may be incorrect, which may cause the Fund to underperform. Additionally, the Subadvisor potentially will be prevented from executing investment decisions
at an advantageous time or price as a result of domestic or global market disruptions, particularly disruptions causing heightened market volatility and reduced market liquidity, as well as increased or changing regulations. Thus, investments that a Subadvisor believes represent an attractive opportunity or in which the Fund seeks to obtain exposure may be unavailable entirely or in the specific quantities or prices sought by a Subadvisor and the Fund

Fund Summary

Harbor Active Commodity ETF

may need to obtain the exposure through less advantageous or indirect investments or forgo the investment at the time.

Subsidiary Risk: By investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. The derivatives and other investments held by the Subsidiary are the same as those that are permitted to be held by the Fund and are subject to the same risks that apply to similar investments if held directly by the Fund. The Subsidiary is not registered under the Investment Company Act of 1940 (the “Investment Company Act”), and, unless otherwise noted in this prospectus, is not subject to all of the investor protections of the Investment Company Act. In addition, changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as described in this Prospectus and the Statement of Additional Information and could adversely affect the Fund.

Tax Risk: The ability of the Fund to gain commodity exposure as contemplated may be adversely affected by future legislation, regulatory developments, interpretive guidance or other actions by the Internal Revenue Service (“IRS”) or the U.S. Department of the Treasury.

U.S. Treasury Obligations Risk: U.S. Treasury obligations may differ from other securities in their interest rates, maturities, times of issuance and other characteristics. Similar to other issuers, changes to the financial condition or credit rating of the U.S. government may cause the value of the Fund’s exposure to U.S. Treasury obligations to decline.

Performance

Because the Fund is newly organized and does not yet have a complete calendar year of performance history, the bar chart and total return tables are not provided. Once the Fund has operated for at least one calendar year, a bar chart and performance table will be included in the prospectus to show the performance of the Fund. When such information is included, this section will provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance history from year to year and showing how the Fund’s average annual total returns compare with those of a broad measure of market performance and an additional index.Please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. To obtain performance information, please visit the Fund’s website at harborcapital.com or call 800-422-1050.

Portfolio Management

Investment Advisor

Harbor Capital Advisors, Inc.

Subadvisor

Quantix Commodities LP (“Quantix”) has subadvised the Fund since [ ].

Portfolio Managers

The portfolio managers are jointly and primarily responsible for the day-to-day investment decision making of the Fund.

Don Casturo

Quantix Commodities LP

Mr. Casturo is a Founding Partner and Chief Investment Officer at Quantix and has served as a portfolio manager for the Fund since 2026.

Daniel Cepeda

Quantix Commodities LP

Mr. Cepeda is a Founding Partner and Portfolio Manager at Quantix and has served as a portfolio manager for the Fund since 2026.

Tom Glanfield

Quantix Commodities LP

Mr. Glanfield is a Founding Partner and Portfolio Manager at Quantix and has served as a portfolio manager for the Fund since 2026.

Marta Kavchak

Quantix Commodities LP

Ms. Kavchak is a Portfolio Manager at Quantix and has served as a portfolio manager for the Fund since 2026.

Buying and Selling Fund Shares

Individual Fund shares may only be bought and sold in the secondary market through a broker or dealer at a market price. Shares of the Fund are listed and traded on an exchange at market price throughout the day rather than at NAV and may trade at a price greater than the Fund’s NAV (premium) or less than the Fund’s NAV (discount). An investor may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase shares (bid) and the lowest price a seller is willing to accept for shares (ask) when buying or selling Fund shares in the secondary market (the “bid-ask spread”). Recent information, including information regarding the Fund’s NAV, market price, premiums and discounts, and bid-ask spread, is available at harborcapital.com.

Additional Information about the Fund’s Investments

Investment Objective

The Fund seeks total return. The Board of Trustees (the “Board of Trustees”) of Harbor ETF Trust may change the Fund’s investment objective without shareholder approval.

Principal Investments

The Fund’s principal investment strategies and the principal associated risks are described in the Fund Summary section at the front of this Prospectus.

More detailed descriptions of certain of the principal risks of the Fund are described below.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Fund shares will go up and down in price, meaning that you could lose money by investing in the Fund. Many factors influence the Fund’s performance and the Fund’s investment strategy may not produce the intended results.

A new fund or a fund with fewer assets under management may be more significantly affected by purchases and redemptions of its Creation Units than a fund with relatively greater assets under management would be affected by purchases and redemptions of its shares. As compared to a larger fund, a new or smaller fund is more likely to sell a comparatively large portion of its portfolio to meet significant Creation Unit redemptions, or invest a comparatively large amount of cash to facilitate Creation Unit purchases, in each case when the fund otherwise would not seek to do so. Such transactions may cause funds to make investment decisions at inopportune times or prices or miss attractive investment opportunities. Such transactions may also accelerate the realization of taxable income if sales of securities result in gains and the fund redeems Creation Units for cash, or otherwise cause a fund to perform differently than intended. While such risks may apply to funds of any size, such risks are heightened in funds with fewer assets under management. In addition, new funds may not be able to fully implement their investment strategy immediately upon commencing investment operations, which could reduce investment performance.

FIXED INCOME SECURITIES

The Fund invests in the following fixed income securities as part of its principal investment strategy:

■

securities issued or guaranteed by the U.S. government, its agencies or government-sponsored enterprises;

■

corporate debt securities of U.S. and non-U.S. issuers, including corporate commercial paper, issued publicly or through private placements, including Rule 144A securities and Regulation S bonds; and

■

repurchase agreements on fixed income instruments (i.e., the purchase of securities by the Fund subject to the seller’s agreement to repurchase the securities at a mutually agreed upon date and price).

Securities issued by U.S. government agencies or government-sponsored enterprises may not be guaranteed by the U.S. Treasury.

The fixed income securities in which the Fund invests have all types of interest rate payment and reset terms, including fixed rate, adjustable rate, inflation indexed, zero coupon, contingent, deferred, payment in-kind and auction rate features.

CREDIT QUALITY

The Fund invests in investment-grade fixed income securities.

Securities are investment-grade if:

■

They are rated in one of the top four long-term rating categories (which are ratings assigned to securities based on an assessment of the issuer’s risk of default) of a nationally recognized statistical rating organization (i.e., Moody’s Investor Service, Inc., Standard & Poor’s Rating Services or Fitch, Inc.). For example, the Fund will consider a security to be investment grade if it is rated AAA, AA, A or BBB by Standard & Poor’s Rating Services.

■

They have received a comparable short-term rating.

■

They are unrated securities that the Subadvisor believes to be of comparable quality to rated investment-grade securities.

If a security receives different ratings, the Fund will treat the security as being rated in the highest rating category. The Fund may choose not to sell securities that are downgraded below investment grade after their purchase. Credit ratings may not be an accurate assessment of liquidity or credit risk. Securities with lower investment grade ratings have speculative characteristics.

GOVERNMENT SECURITIES

“Government securities,” as defined under the Investment Company Act of 1940 and interpreted, include securities issued or guaranteed by the United States or certain U.S. government agencies or instrumentalities. There are different types of government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. For example, a U.S. government-sponsored entity, such as Federal National Mortgage Association or Federal Home Fixed income securities, as used, although chartered or sponsored by an Act of Congress, may issue securities that are neither insured nor guaranteed by the U.S. Treasury and are therefore riskier than those that are insured or guaranteed by the U.S. Treasury.

Additional Information about the Fund’s Investments

Fixed Income Securities Risks

Changing interest rates may have unpredictable effects on the markets, may result in heightened market volatility and may detract from Fund performance. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates. A sudden or unpredictable increase in interest rates may cause volatility in the market and may decrease liquidity in the fixed-income securities markets, making it harder for the Fund to sell its fixed-income investments at an advantageous time. Decreased market liquidity also may make it more difficult to value some or all of the Fund’s fixed-income securities holdings. Certain countries have experienced negative interest rates on certain fixed-income securities. A low or negative interest rate environment may pose additional risks to the Fund because low or negative yields on the Fund’s portfolio holdings may have an adverse impact on the Fund’s ability to provide a positive yield to its shareholders, pay expenses out of Fund assets, or minimize the volatility of the Fund’s net asset value per share. It is difficult to predict the magnitude, timing or direction of interest rate changes and the impact these changes will have on the Fund’s investments and the markets where it trades. Securities issued by U.S. government agencies or government-sponsored enterprises may not be guaranteed by the U.S. Treasury.

DERIVATIVE INSTRUMENTS

In general, a derivative instrument will obligate or entitle the Fund to deliver or receive an asset or a cash payment that is based on the change in value of a designated security, index, or other asset.

The Fund seeks to gain exposure to the commodity markets primarily through investments in commodity futures and commodity-linked swap agreements. Swaps are derivative contracts between two parties to exchange the cash flows or returns from a financial asset between them. One party (the Fund or the Subsidiary) makes payments based on a set rate. The counterparty makes payments based on the cash flow or return of an underlying asset, such as a commodity or commodity index. Commodity futures are agreements to purchase or sell a specific quantity of a physical commodity at a specified price on a particular date in the future.

These derivatives expose the Fund economically to movements in commodity prices. A Fund’s investments in commodity-linked derivatives are leveraged, which means that the Fund receives the return on the commodity or other financial instrument at less cost than purchasing the underlying commodity or instrument. This has the effect of increasing the volatility of each contract’s value relative to changes in the underlying commodity or instrument. The use of over-the-counter derivative contracts exposes a Fund to counterparty risk (the risk that the other party in the contract may default on its contractual obligations).

Even a small investment in certain types of derivatives can have a big impact on the Fund’s portfolio interest rate, stock market or currency exposure. Therefore, using derivatives can disproportionately increase the Fund’s portfolio losses and reduce opportunities for gains when interest rates, stock prices or currency rates are changing. The Fund may not fully benefit from or may lose money on derivatives if changes in their value do not correspond as expected to changes in the value of the Fund’s portfolio holdings.

Counterparties to over-the-counter derivative contracts present the same types of credit risk as issuers of fixed income securities. Derivatives also can make the Fund’s portfolio less liquid and harder to value, especially in declining markets. In addition, government legislation or regulation may make derivatives more costly, may limit the availability of derivatives, or may otherwise adversely affect the use, value or performance of derivatives.

ROLLING FUTURES CONTRACTS

As part of its strategy for the Fund, the Subadvisor will engage in “rolling” of futures contracts. As the exchange-traded futures contracts held by the Fund approach expiration, they will be sold prior to their expiration date and similar contracts that have a later expiration date will be purchased. Thus, for example, a futures contract purchased and held in August may specify an October expiration. As time passes, the contract expiring in October may be replaced by a contract for delivery in November. Any difference between the price for the nearer delivery month contract and the price for the distant month contract is known as a “roll yield” and can be either a positive amount or a negative amount. If the market for these contracts is (putting aside other considerations) in “backwardation”, which means that the prices are lower in the distant delivery months than in the nearer delivery months, the sale of the October contract would take place at a price that is higher than the price of the November contract, thereby creating a “roll yield.” While some of the contracts the Fund may hold have historically exhibited consistent periods of backwardation, backwardation may not exist at all times. Moreover, certain commodities, such as gold, have historically traded in “contango” markets. Contango markets are those in which the prices of contracts are higher in the distant delivery months than in the nearer delivery months. The absence of backwardation and presence of contango in a particular commodity market could result in negative “roll yields,” which could adversely affect the value of the Fund. However, the existence of contango (or backwardation) in a particular commodity market does not automatically result in negative (or positive) “roll yields.” The actual realization of a potential roll yield will be dependent upon the shape of the futures curve. The term “futures curve” refers to the relationship between the price of futures contracts over different futures contract maturity dates when plotted in a graph. If the relevant part of the commodity

Additional Information about the Fund’s Investments

futures curve is in backwardation — a downward sloping futures curve — then, all other factors being equal, the price of a product or index holding that future will tend to rise over time as lower futures prices converge to higher spot prices. The opposite effect would occur for contango.

COMMODITY-RELATED INVESTMENTS RISKS

The Fund principally invests in instruments that expose it to commodity risks. Exposure to commodities often involves higher volatility than traditional securities. Their value can fluctuate based on market trends, commodity index changes, interest rates, and industry-specific factors like supply and demand, weather, and global economic or political developments. These investments may also react to perceived instability in the economy, even if unwarranted. Rising interest rates may negatively impact commodity prices by increasing the cost of carrying or financing physical commodities. Events such as natural disasters, droughts, floods or pandemics can disrupt supply chains and affect commodity availability. Regulatory and political factors such as embargoes, tariffs, sanctions or changes in international trade agreements can impact supply and demand. Certain commodities or related instruments may lack active trading markets and sudden market closures or interruptions can prevent timely liquidation of investments. Shifts in commodity market regulations, including margin requirements or trading restrictions, could adversely affect investments. While commodities can diversify a portfolio due to low correlation with traditional assets, this benefit is not guaranteed. During periods of market stress, correlations may increase, reducing diversification advantages. Extraction, production, and use of commodities may face increasing scrutiny due to environmental and social concerns, potentially impacting prices or limiting investment opportunities.

NON-DIVERSIFICATION RISK

The Fund is classified as non-diversified, meaning that it may invest a greater percentage of its assets in securities of a single issuer, and/or invest in relatively small number of issuers. As a result, the Fund may be more susceptible to the risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio. Some of these issuers may also present substantial credit or other risks.

INVESTMENTS IN A WHOLLY OWNED SUBSIDIARY

The Fund obtains exposure to the commodity markets within the limitations of Subchapter M of the Internal Revenue Code through investments in a wholly owned subsidiary (the “Subsidiary”), as discussed under “Dividends, Distributions and Taxes — A Note on Wholly Owned Subsidiary Investments.”

The Subsidiary invests primarily in exchange-traded products backed by or linked to physical commodities or commodity-linked derivative instruments, including swap agreements, commodity options, futures and options on futures. Although the Fund may enter into commodity-linked derivative instruments directly, subject to certain limitations, the Fund likely will gain exposure to these derivative instruments indirectly by investing in the Subsidiary. The Subsidiary also invests in U.S. Treasury securities, cash, and money market funds, which are intended to serve as margin or collateral for the Subsidiary’s derivatives positions. The Fund invests in the Subsidiary and is subject to the risks associated with those derivative instruments and other securities, which are discussed elsewhere in this Prospectus, as if the Fund were investing in those derivative instruments and other securities directly rather than through the Subsidiary.

The Subsidiary is not registered under the Investment Company Act and, unless otherwise noted in this Prospectus, is not subject to all of the investor protections of the Investment Company Act. However, the Subsidiary has adopted the same investment objective and substantially the same investment policies and restrictions as the Fund, except that the Subsidiary may invest without limit in commodity-linked derivative instruments. The Fund wholly owns and controls the Subsidiary, and both the Fund and the Subsidiary have the same investment adviser and subadviser. In addition, the Fund complies with the provisions of the Investment Company Act governing investment policies (Section 8) and capital structure and leverage on an aggregate basis with the Subsidiary. The Subsidiary will comply with the provisions of the Investment Company Act pertaining to affiliated transactions and custody.

Because the Subsidiary is organized under the laws of the Cayman Islands, the Subsidiary is subject to the risk that changes in those laws could adversely affect the Subsidiary’s ability to operate in the manner described in this Prospectus and Statement of Additional Information which, in turn, would adversely affect the Fund. Similarly, changes in the laws of the United States, including tax laws, could restrict the Fund’s ability to invest in the Subsidiary in such a manner and to such a degree that the Fund would no longer be able to gain sufficient exposure to the commodities market to implement its investment strategy.

RISKS RELATED TO DATA PROVIDERS AND DATA ACCURACY

The Subadvisor relies on third-party data providers for various types of financial, market, and index data used in the Fund’s investment process. These data providers may experience errors, omissions, or delays in the collection, processing, and dissemination of data. While the Subadvisor seeks to identify and correct such errors, there is no guarantee that all inaccuracies will be detected in a timely manner or at all.

Errors in third-party data may affect the calculation of the Fund’s net asset value, portfolio composition, risk metrics or other aspects of Fund performance. In some cases, these errors may result in trading losses,

Additional Information about the Fund’s Investments

misallocation of assets, or unintended exposures. The Fund, the Advisor and the Subadvisor do not independently verify third-party data and rely on the accuracy of the information provided.

Additionally, if a data provider restates or revises historical data after the Fund has made investment decisions based on such information, the Fund may suffer losses or underperform its benchmark.

OPERATIONAL RISKS

An investment in the Fund, like any fund, can involve operational risks arising from factors such as processing errors, inadequate or failed processes, failure in systems and technology, cybersecurity breaches, changes in personnel and errors caused by third-party service providers. These errors or failures as well as other technological issues may adversely affect the Fund’s ability to calculate its net asset value in a timely manner, including over a potentially extended period, or may otherwise adversely affect the Fund and its shareholders. While the Fund seeks to minimize such events through controls and oversight, there may still be failures that could cause losses to the Fund. In addition, similar incidents affecting issuers of securities or other financial instruments held by the Fund may negatively impact Fund performance.

Non-Principal Investments

In addition to the investment strategies described in this Prospectus, the Fund may also make other types of investments, and, therefore, may be subject to other risks. For additional information about the Fund, its investments and related risks, please see the Fund’s Statement of Additional Information.

TEMPORARY DEFENSIVE POSITIONS

The Fund may take temporary defensive positions that are inconsistent with its normal investment policies and strategies—for instance, by allocating substantial assets to cash equivalent investments or other less volatile instruments—in response to adverse market, economic, political, or other conditions. In doing so, the Fund may succeed in avoiding losses but may otherwise fail to achieve its investment objective.

Exchange-Traded Fund Structure

Shares can be purchased and redeemed directly from the Fund at NAV only by authorized participants in large increments (Creation Units). The Fund’s shares are listed on an exchange and can be bought and sold in the secondary market at market prices. The market price of the Fund’s shares, like other exchange-traded securities, may include a “bid-ask spread” (the difference between the price at which investors are willing to buy shares and the price at which investors are willing to sell shares). The Fund’s market price per share will generally fluctuate with changes in the market value of the Fund’s portfolio holdings and as a result of the supply and demand for shares of the Fund on the listing exchange.

There is no guarantee that the Fund will be able to attract market makers and authorized participants. Market makers and authorized participants are not obligated to make a market in the Fund’s shares or to engage in purchase or redemption transactions. Decisions by market makers or authorized participants to reduce their role with respect to market making or creation and redemption activities during times of market stress, or a decline in the number of authorized participants due to decisions to exit the business, bankruptcy, or other factors, could inhibit the effectiveness of the arbitrage process in maintaining the relationship between the underlying value of the Fund’s portfolio holdings and the market price of Fund shares. To the extent no other authorized participants are able to step forward to create or redeem, shares may trade at a discount to NAV and possibly face delisting. The authorized participant concentration risk may be heightened during market disruptions or periods of market volatility and in scenarios where authorized participants have limited or diminished access to the capital required to post collateral.

Investors may sustain losses if they pay more than the Fund’s NAV per share when purchasing shares or receive less than the Fund’s NAV per share when selling shares in the secondary market. In addition, trading of shares of the Fund in the secondary market may be halted, for example, due to activation of marketwide “circuit breakers.” If trading halts or an unanticipated early closing of the listing exchange occurs, an investor may be unable to purchase or sell shares of the Fund. Shares of the Fund, similar to shares of other issuers listed on a stock exchange, may be sold short and are therefore also subject to the risk of increased volatility and price decreases associated with being sold short. There are various methods by which investors can purchase and sell shares and various orders that may be placed. Investors should consult their financial intermediary before purchasing or selling shares of the Fund.

Certain accounts or Advisor affiliates, including other funds advised by the Advisor or third parties, may from time to time own (beneficially or of record) or control a substantial amount of the Fund’s shares, including through seed capital arrangements. Such shareholders may at times be considered to control the Fund. Dispositions of a large number of shares of the Fund by these shareholders may adversely affect the Fund’s liquidity and net assets to the extent such transactions are executed directly with the Fund in the form of redemptions through an authorized participant, rather than executed in the secondary market. These redemptions may also force the Fund to sell securities or other financial instruments, which may increase the Fund’s brokerage costs. To the extent these large shareholders transact in shares of the Fund on the secondary market, such transactions may account for a large percentage of the trading volume on the listing exchange and may, therefore, have a material effect (upward or downward), on the market price of the Fund’s shares.

The Advisor

Harbor Capital Advisors, Inc.

Harbor Capital Advisors, Inc. (“Harbor Capital” or the “Advisor”) is the investment adviser to Harbor ETF Trust. The Advisor, located at 111 South Wacker Drive, 34th Floor, Chicago, Illinois 60606-4302, is a wholly owned subsidiary of ORIX Corporation (“ORIX”), a global financial services company based in Tokyo, Japan. ORIX provides a range of financial services to corporate and retail customers around the world, including financing, leasing, real estate and investment banking services. The stock of ORIX trades publicly on both the New York (through American Depositary Receipts) and Tokyo Stock Exchanges.

The combined assets of Harbor ETF Trust and the other products managed by the Advisor were approximately [$XX billion] as of [XXXX].

The Advisor may manage funds directly or employ a “manager-of-managers” approach in selecting and overseeing investment subadvisers (each, a “Subadvisor”). The Advisor makes day-to-day investment decisions with respect to each fund that it directly manages, such as the Fund. In the case of subadvised funds, the Advisor allocates fund assets to one or more Subadvisors. Each Subadvisor is responsible for the day-to-day management of the assets allocated to it.

Subject to the approval of the Board of Trustees, the Advisor establishes, and may modify whenever deemed appropriate, the investment strategy of the Fund. The Advisor also is responsible for overseeing each Subadvisor and recommending the selection, termination and replacement of Subadvisors.

The Advisor also:

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Seeks to ensure quality control in each Subadvisor’s investment process with the objective of adding value compared with returns of an appropriate risk and return benchmark or tracking an index, as applicable.

■

Monitors and measures risk and return results against appropriate benchmarks and recommends whether the Subadvisor should be retained or changed.

■

Focuses on cost control.

In order to more effectively manage the Fund, Harbor Funds and the Advisor have been granted an order from the Securities and Exchange Commission (“SEC”), which extends to Harbor ETF Trust, permitting the Advisor, subject to the approval of the Board of Trustees, to select Subadvisors not affiliated with the Advisor to serve as portfolio managers for the Harbor funds, and to enter into new subadvisory agreements and to materially modify existing subadvisory agreements with such unaffiliated subadvisors, all without obtaining shareholder approval.

In addition to its investment management services, the Advisor administers the business affairs of Harbor ETF Trust. Pursuant to the Investment Advisory Agreement between the Trust and the Advisor with respect to the Fund, and subject to the general supervision of the Board of Trustees, the Advisor provides or causes to be furnished, all supervisory and other services reasonably necessary for the operation of the Fund and also bears the costs of various third-party services required by the Funds, including administration, certain custody, audit, legal, transfer agency, and printing costs. The Advisor pays all other expenses of the Fund except for (i) the fee payment under the Investment Advisory Agreement; (ii) payments under the Fund’s 12b-1 plan (if any); (iii) the costs of borrowing, including interest and dividend expenses; (iv) taxes and governmental fees; (v) acquired fund fees and expenses; (vi) brokers’ commissions and any other transaction-related expenses and fees arising out of transactions effected on behalf of the Fund; (vii) costs of holding shareholder meetings; (viii) any gains or losses attributable to investments under a deferred compensation plan for Trustees who are not “interested persons” of the Trust; and (ix) litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of a Fund’s business. The Advisor pays a subadvisory fee to each Subadvisor out of its own assets. The Funds are not responsible for paying any portion of the subadvisory fee to a Subadvisor.

Annual Advisory Fee Rates

(annual rate based on the Fund’s average net assets)

	Actual Advisory Fee Paid	Contractual Advisory Fee
Harbor Active Commodity ETF	N/A 1	[ ]
1 Had not commenced operations as of the date of this Prospectus

A discussion of the factors considered by the Board of Trustees when approving the investment advisory and subadvisory agreement of the Fund will be available in the Fund’s first Form N-CSR filing following the Fund’s commencement of operations.

From time to time, the Advisor or its affiliates may invest “seed” capital in a fund, typically to enable a fund to commence investment operations and/or achieve sufficient scale. The Advisor and its affiliates may hedge such seed capital exposure by investing in derivatives or other instruments expected to produce offsetting exposure. Such hedging transactions, if any, would occur outside of a fund.

The Subadvisor

The Statement of Additional Information provides additional information about portfolio manager compensation, other accounts managed by each portfolio manager and each portfolio manager’s ownership of shares in the Fund.

Harbor Active Commodity ETF

Quantix Commodities LP, located at 16 Old Track Road, Suite A, Greenwich, CT 06830, serves as Subadvisor to Harbor Active Commodity ETF. The portfolio managers are jointly and primarily responsible for the day-to-day investment decision making for the Fund.

PORTFOLIO MANAGERS		PROFESSIONAL EXPERIENCE
Don Casturo		Mr. Casturo is a Founding Partner and Chief Investment Officer at Quantix. He had a 20-year career at Goldman Sachs where he was a Partner in the commodity group. From 2015-2018 he was Head of Commodity Trading for all of EMEA. Prior to that he served as Global Commodities COO and managed the Global Investor Products Desk from 2007-2013. In addition, he was the lead Crude Derivatives trader from 1998-2006, member of the LME User Committee, member of the CFTC Market Advisory Committee and speaker at the Position Limit Hearing in 2008. Mr. Casturo began his investment career in 1995.
Daniel Cepeda		Mr. Cepeda is a Founding Partner and Portfolio Manager at Quantix. During his career at Goldman Sachs, Mr. Cepeda was Head of Commodity Structured Products, Head of Commodity Index Options and Head of Base Metal Derivatives. Mr. Cepeda started his Goldman Sachs career as an Associate in New York, spent two years in London restructuring the Base Metals Derivatives business and was a Managing Director in Commodities for five years. He began his investment career in 1999.
Tom Glanfield		Mr. Glanfield is a Founding Partner and Portfolio Manager at Quantix. During his career at Goldman Sachs, he was the Global Head of Investor Swaps Trading, Lead Index Options and Commodity Structured Products Trader, Head of European Oil Products and Global Head of Oil Derivatives. Mr. Glanfield started his Goldman Sachs career in Commodity Investor Products business with a focus on new product development before moving to the trading side of the business where he ultimately ran the largest commodity index swaps book and oversaw index futures trading for Goldman Sachs. Mr. Glanfield was a Managing Director in commodities for six years and worked in both New York and London. He began his investment career in 2002.
Marta Kavchak		Ms. Kavchak is a Portfolio Manager – Investor Solutions Group at Quantix. Her experience in the commodity markets spans across trading, portfolio management, and risk management in the physical markets. After starting her career as a trader at Goldman Sachs in New York, Ms. Kavchak was a Portfolio Manager at Gresham Investment Management for 8 years, where she managed long-only / long-biased portfolios within Gresham’s actively managed commodity fund. Ms. Kavchak also spent over 3 years at Archer Daniels Midland as a senior trader, risk manager, and investor for their global commodities businesses. She began her investment career in 2010.

Shareholder Information

Valuing Fund Shares

The Fund’s net asset value (“NAV”) per share, is generally calculated each day the NYSE is open for trading as of the close of regular trading on the NYSE, generally 4:00 p.m. Eastern time. The NAV per share is computed by dividing the net assets of the Fund by the number of Fund shares outstanding. The prices at which creations and redemptions occur are based on the next calculation of NAV after a creation or redemption order is received in an acceptable form. The time at which shares and transactions are priced and until which orders are accepted may vary to the extent permitted by the Securities and Exchange Commission and applicable regulations.

Shares of the Fund may be purchased through a broker in the secondary market by individual investors at market prices which may vary throughout the day and may differ from NAV.

On holidays or other days when the NYSE is closed, the NAV is not calculated and the Fund does not transact purchase or redemption requests. Trading of securities that are primarily listed on foreign exchanges may take place on weekends and U.S. business holidays on which the Fund’s NAV is not calculated. Consequently, the Fund’s portfolio securities or other financial instruments may trade and the NAV of the Fund’s shares may be significantly affected on days when a shareholder will not be able to purchase or sell shares of the Fund.

Investments are valued pursuant to valuation procedures approved by the Board of Trustees. The valuation procedures permit the Advisor to use a variety of valuation methodologies, consider a number of subjective factors, analyze applicable facts and circumstances and, in general, exercise judgment, when valuing Fund investments. The methodology used for a specific type of investment may vary based on the circumstances and relevant considerations, including available market data. As a general matter, accurately fair valuing investments is difficult and can be based on inputs and assumptions that may not always be correct.

The Fund generally values portfolio securities or other financial instruments and other assets for which market quotes are readily available at market value for purposes of calculating the Fund’s NAV. In the case of equity securities, market value is generally determined on the basis of last reported sales prices, or if no sales are reported, on quotes obtained from a quotation reporting system, established market makers, or independent pricing vendors. In the case of fixed income securities and non-exchange traded derivative instruments, fair value is generally determined using prices provided by independent pricing vendors. The prices provided by independent pricing vendors reflect the pricing vendor’s assessment using various market inputs of what it believes are the fair values of the securities or other financial instruments at the time of pricing. Those market inputs include recent transaction prices and dealer quotations for the securities or other financial instruments, transaction prices for what the independent pricing vendor believes are similar securities and various relationships between factors such as interest rate changes and security prices that are believed to affect the prices of individual securities or other financial instruments. Because many fixed income securities trade infrequently, the independent pricing vendor often does not have as a market input, current transaction price information when determining a price for a particular security on any given day. When current transaction price information is available, it is one input into the independent pricing vendor’s evaluation process, which means that the price supplied by the pricing vendor may differ from that transaction price. Short-term fixed income investments having a maturity of 60 days or less are generally valued at amortized cost, which approximates fair value. Exchange-traded options, futures and options on futures are generally valued at the settlement price determined by the relevant exchange.

When reliable market quotations or prices supplied by an independent pricing vendor are not readily available or are not believed to accurately reflect fair value, securities or other financial instruments are generally priced at their fair value, determined according to fair value pricing procedures adopted by the Board of Trustees. The Fund may also use fair value pricing if the value of some or all of the Fund’s securities or other financial instruments have been materially affected by events occurring before the Fund’s pricing time but after the close of the primary markets or exchanges on which the security is traded. This most commonly occurs with foreign securities, but may occur with other securities or other financial instruments as well. When fair value pricing is employed, the prices of securities or other financial instruments used by the Fund to calculate its NAV may differ from market quotations, official closing prices or prices supplied by an independent pricing vendor for the same securities. This means the Fund may value those securities or other financial instruments higher or lower than another given fund that uses market quotations, official closing prices or prices supplied by an independent pricing vendor. The fair value prices used by the Fund may also differ from the prices that the Fund could obtain for those securities or other financial instruments if the Fund were to sell those securities or other financial instruments at the time the Fund determines its NAV.

Shareholder Information

Buying and Selling Shares

The Fund issues and redeems shares only in Creation Units at the NAV per share next determined after receipt of an order from an authorized participant. Authorized participants must be a member or participant of a clearing agency registered with the SEC and must execute a Participant Agreement that has been agreed to by the Distributor, and that has been accepted by the Transfer Agent, with respect to purchases and redemptions of Creation Units. Only authorized participants may acquire shares directly from the Fund, and only authorized participants may tender their shares for redemption directly to the Fund, at NAV. Once created, shares trade in the secondary market in quantities less than a Creation Unit.

These transactions are made at market prices that may vary throughout the day and may be greater than the Fund’s NAV (premium) or less than the Fund’s NAV (discount). As a result, you may pay more than NAV when you purchase shares, and receive less than NAV when you sell shares, in the secondary market. If you buy or sell shares in the secondary market, you will generally incur customary brokerage commissions and charges and you may also incur the cost of the spread between the price at which a dealer will buy shares of the Fund and the somewhat higher price at which a dealer will sell shares. Due to such commissions and charges and spread costs, frequent trading may detract significantly from investment returns.

The Fund may impose a creation transaction fee and a redemption transaction fee to offset transfer and other transaction costs associated with the issuance and redemption of Creation Units of shares. Information about the procedures regarding creation and redemption of Creation Units and the applicable transaction fees is included in the Statement of Additional Information.

Distribution and Service (12b-1) Fees

Harbor ETF Trust has adopted a distribution plan for the Fund in accordance with Rule 12b-1 under the Investment Company Act. Under its plan, the Fund is authorized to pay distribution and service fees to the Distributor for the sale, distribution and servicing of shares. No Rule 12b-1 fees are currently paid by the Fund, and there are no current plans to impose these fees. However, in the event Rule 12b-1 fees are charged in the future, because these fees are paid out of the Fund’s assets on an ongoing basis, these fees will increase the cost of your investment in the Fund may cost you more than certain other types of sales charges.

Investing Through a Financial Intermediary

The Advisor and/or its related companies have in the past and could in the future pay intermediaries, which may include banks, broker-dealers, or financial professionals, for marketing activities and presentations, educational training programs, conferences, the development of technology platforms and reporting systems and data or other services related to the sale of Fund shares and related services, including making shares of the Fund and certain other Harbor funds available to their customers generally and in certain investment programs. Such payments, which may be significant to the intermediary or its representatives, are not made by the Fund. Rather, such payments are made by the Advisor or its affiliates from their own resources, which come directly or indirectly in part from fees paid by the Harbor fund complex. Payments of this type are sometimes referred to as revenue-sharing payments.

A financial intermediary may make decisions about which investment options it recommends or makes available, or the level of services provided, to its customers based on the payments or financial incentives it is eligible to receive. Therefore, such payments or other financial incentives offered or made to an intermediary create conflicts of interest between the intermediary (or its representatives) and its customers and may cause the intermediary to recommend the Fund or other Harbor funds over another investment. See the Statement of Additional Information for more information. Ask your sales representative or visit your financial intermediary’s website for more information.

Book Entry

Shares of the Fund are held in book-entry form, which means that no stock certificates are issued. The Depository Trust Company (DTC), or its nominee, is the registered owner of all outstanding shares of the Fund. Your ownership of shares will be shown on the records of DTC and the DTC participant broker-dealer through which you hold the shares. Your broker-dealer will provide you with account statements, confirmations of your purchases and sales, and tax information. Your broker-dealer will also be responsible for distributing income and capital gain distributions and for sending you shareholder reports and other information as may be required.

Frequent Purchases and Redemptions of Shares

The Fund accommodates frequent purchases and redemptions of Creation Units by authorized participants and does not place a limit on purchases or redemptions of Creation Units by these investors. The Fund

Shareholder Information

reserves the right, but does not have the obligation, to reject any purchase or redemption transaction (subject to legal and regulatory limits regarding redemption transactions) at any time.

Shareholder Actions

With the exception of any claims under the federal securities laws, any suit, action or proceeding brought by or in the right of any shareholder or any person claiming any interest in any Fund shares seeking to enforce any provision of, or based on any matter arising out of, or in connection with, Harbor ETF Trust’s By-Laws or Harbor ETF Trust or any Fund, including any claim of any nature against Harbor ETF Trust, a Fund, the Trustees or officers or employees of Harbor ETF Trust, shall be brought exclusively in the Court of Chancery of the State of Delaware to the extent there is subject matter jurisdiction in such court for the claims asserted or, if not, then in the Superior Court of the State of Delaware. Any suits, actions or proceedings arising under the federal securities laws shall be exclusively brought in the federal district courts of the United States of America. As a result of these provisions, shareholders may have to bring suit in an inconvenient and less favorable forum. There is a question regarding the enforceability of these provisions since the Securities Act of 1933 (the “1933 Act”) and the 1940 Act permit shareholders to bring claims arising from these Acts in both state and federal courts.

Investments by Registered Investment Companies

Section 12(d)(1) of the Investment Company Act restricts investments by registered investment companies in the securities of other investment companies, including shares of the Fund. Registered investment companies are permitted to invest in the Fund beyond the limits of Section 12(d)(1), subject to certain terms and conditions, including the requirement to enter into an agreement with the Fund.

Note to Authorized Participants Regarding Continuous Offering

Certain legal risks may exist that are unique to authorized participants purchasing Creation Units directly from the Fund. Because new Creation Units may be issued on an ongoing basis, at any point a “distribution," as such term is used in the 1933 Act, could be occurring. As a broker-dealer, certain activities that you perform may, depending on the circumstances, result in your being deemed a participant in a distribution, in a manner which could render you a statutory underwriter and subject you to the prospectus delivery and liability provisions of the 1933 Act.

For example, you may be deemed a statutory underwriter if you purchase Creation Units from the Fund, break them down into individual Fund shares, and sell such shares directly to customers, or if you choose to couple the creation of a supply of new Fund shares with an active selling effort involving solicitation of secondary market demand for Fund shares. A determination of whether a person is an underwriter for purposes of the 1933 Act depends upon all of the facts and circumstances pertaining to that person’s activities, and the examples mentioned here should not be considered a complete description of all the activities that could lead to a categorization as an underwriter.

Dealers who are not “underwriters” but are participating in a distribution (as opposed to engaging in ordinary secondary market transactions), and thus dealing with shares as part of an “unsold allotment” within the meaning of Section 4(a)(3)(C) of the 1933 Act, will be unable to take advantage of the prospectus delivery exemption provided by Section 4(a)(3) of the 1933 Act.

This is because the prospectus delivery exemption in Section 4(a)(3) of the 1933 Act is not available in respect of such transactions as a result of Section 24(d) of the 1940 Act. As a result, you should note that dealers who are not underwriters but are participating in a distribution (as opposed to engaging in ordinary secondary market transactions) and thus dealing with the shares that are part of an overallotment within the meaning of Section 4(a)(3)(A) of the 1933 Act would be unable to take advantage of the prospectus delivery exemption provided by Section 4(a)(3) of the 1933 Act. Firms that incur a prospectus-delivery obligation with respect to shares of the Fund are reminded that, under Rule 153 under the 1933 Act, a prospectus delivery obligation under Section 5(b)(2) of the 1933 Act owed to an exchange member in connection with a sale on an exchange is satisfied by the fact that the prospectus is available at the exchange upon request. The prospectus delivery mechanism provided in Rule 153 is only available with respect to transactions on an exchange. Certain Fund affiliates may purchase and resell Fund shares pursuant to this prospectus.

Shareholder and Account Policies

This Prospectus provides general tax information only. You should consult your tax adviser about particular federal, state, local or foreign taxes that may apply to you.

Dividends, Distributions and Taxes

The Fund expects to distribute all or substantially all of its net investment income and realized capital gains, if any, each year. The Fund declares and pays any dividends from net income and capital gains at least annually in December. The Fund may also pay dividends and capital gain distributions at other times if necessary, to avoid federal income or excise tax. The Fund expects distributions, if any, to be from net investment income and/or capital gains. If you purchased your shares in the secondary market, your broker is responsible for distributing the income and capital gains distributions to you.

For U.S. federal income tax purposes, distributions of net long-term capital gains are taxable as long-term capital gains which may be taxable at different rates depending on their source and other factors. Distributions of net short-term capital gains are taxable as ordinary income. Dividends from net investment income are taxable either as ordinary income or, if so reported by the Fund and certain other conditions (including holding period requirements) are met by the Fund and the shareholder, as “qualified dividend income” (“QDI”). QDI is taxable to individual shareholders at a maximum rate of 15% or 20% for U.S. federal income tax purposes (depending on whether the individual’s income exceeds certain threshold amounts). Since the Fund derives its income primarily from sources that do not pay “qualified dividend income,” dividends from the Fund generally will not qualify for taxation at the maximum 15% or 20% U.S. federal income tax rate available to individuals on qualified dividend income. More information about QDI is included in the Fund’s Statement of Additional Information. Dividends and capital gains distributions are taxable whether you receive them in cash or reinvest them in additional Fund shares.

Generally, you should avoid investing in the Fund shortly before an anticipated dividend or capital gain distribution. If you purchase shares of the Fund just before the distribution, you will pay the full price for the shares and receive a portion of the purchase price back as a taxable distribution. Dividends paid to you may be included in your gross income for tax purposes, even though you may not have participated in the increase in the NAV of the Fund. This is referred to as “buying a dividend.”

When you sell Fund shares, you generally will realize a capital gain or capital loss in an amount equal to the difference between the net amount of the sale proceeds you receive and your tax basis for the shares that you sell or exchange. Character and tax status of distributions will be available to shareholders after the close of each calendar year.

An additional 3.8% Medicare tax is imposed on certain net investment income (including ordinary dividends and capital gains distributions received from the Fund and net gains from redemptions or other taxable dispositions of Fund shares) earned by U.S. individuals, estates and trusts to the extent that such person’s “modified adjusted gross income” (in the case of an individual) or “adjusted gross income” (in the case of an estate or trust) exceeds a threshold amount.

If you do not provide your correct social security number or other taxpayer identification number, along with certifications required by the Internal Revenue Service (“IRS”), you may be subject to a backup withholding tax, currently at a rate of 24%, on any dividends and capital gain distributions, and any other payments to you. Investors other than U.S. persons may be subject to different U.S. federal income tax treatment, including withholding tax at the rate of 30% (or lower applicable treaty rate) on amounts treated as ordinary dividends or otherwise “withholdable payments” from the Fund, as discussed in more detail in the Fund’s Statement of Additional Information.

Taxes on Creations and Redemptions of Creation Units

An authorized participant who exchanges securities for Creation Units generally will recognize a gain or loss. The gain or loss will be equal to the difference between the market value of the Creation Units at the time of exchange and the sum of the exchanger’s aggregate basis in the securities surrendered and the amount of any cash paid for such Creation Units. An authorized participant who exchanges Creation Units for securities will generally recognize a gain or loss equal to the difference between the exchanger’s basis in the Creation Units and the sum of the aggregate market value of the securities received. The IRS, however, may assert that a loss realized upon an exchange of primarily securities for Creation Units cannot be deducted currently under the rules governing “wash sales,” or on the basis that there has been no significant change in economic position. Authorized participants exchanging securities for Creation Units or redeeming Creation Units should consult their own tax advisers with respect to whether wash sale rules apply and when a loss might be deductible and the tax treatment of any creation or redemption transaction.

Under current U.S. federal income tax laws, any capital gain or loss realized upon a redemption (or creation) of Creation Units held as capital assets is generally treated as long-term capital gain or loss if the Shares (or securities surrendered) have been held for more than one year and as a short-term capital gain or loss if the Shares (or securities surrendered) have been held for one year or less.

If you create or redeem Creation Units, you will be sent a confirmation statement showing how many Shares you created or sold and at what price.

Shareholder and Account Policies

A Note on Wholly Owned Subsidiary Investments. One of the requirements for favorable tax treatment as a regulated investment company under the Internal Revenue Code is that the Fund derive at least 90% of gross income from certain qualifying. Income and gains from direct investments by the Fund in commodity-related instruments generally would not be treated as qualifying income. The IRS has issued final regulations that generally treat the Fund’s income inclusion with respect to the Subsidiary as qualifying income if either (A) there is a current-year distribution out of the earnings and profits of the Subsidiary that are attributable to such income inclusion or (B) such inclusion is derived with respect to the Fund’s business of investing in stock, securities, or currencies. Based upon these Treasury Regulations, income and gains derived from the Subsidiary are expected to constitute qualifying income.

A Subsidiary generally will not be subject to U.S. federal income tax. A Subsidiary will, however, be considered a controlled foreign corporation, and the investing Fund will be treated as a “U.S. shareholder” of such Subsidiary. As a result, the Fund will be required to include in its annual income, income earned by the respective Subsidiary during the applicable year, whether or not such income is distributed by the Subsidiary. Furthermore, the Fund will be subject to the distribution requirement applicable to open-end management investment companies on such Subsidiary income, whether or not the Subsidiary actually makes a distribution to the Fund during the taxable year. If a net loss is realized by a Subsidiary, such loss is not generally available to offset the income earned by the investing Fund, and such loss would not be carried forward to offset taxable income of the Fund or the Subsidiary in future periods.

Future legislation, Treasury Regulations, court decisions and/or guidance issued by the IRS could limit the circumstances in which income and gains derived from a Subsidiary would be considered qualifying income under Subchapter M of the Internal Revenue Code or otherwise affect the character, timing and/or amount of the Fund’s taxable income or any gains and distributions made by the Fund.

If the Fund fails to qualify as a regulated investment company for any taxable year, such Fund’s taxable income would be subject to tax at the Fund level and to a further tax at the shareholder level when such income is distributed. In such event, in order to re-qualify for taxation as a regulated investment company, the Fund may be required to recognize unrealized gains, pay substantial taxes and interest and make certain distributions.

Cost Basis

The cost basis of Shares acquired by purchase will generally be based on the amount paid for the Shares subject to adjustments as required by the Internal Revenue Code. The difference between the selling price and the cost basis of Shares generally determines the amount of the capital gain or loss realized on the sale or exchange of Shares. The cost basis information for sale transactions is generally required to be reported to the IRS and the shareholders. You may elect to have one of several cost basis methods applied to your account and should consult with your tax adviser regarding your specific situation. You should contact your financial intermediary through whom you purchased your Shares to obtain information with respect to the available cost basis reporting methods and elections for your account.

	For more information
	For investors who would like more information about the Fund, the following documents are available upon request:

Annual/Semi-Annual Shareholder Reports and Form N-CSRs

Additional information about the Fund’s investments is available in the Fund’s annual and semi-annual reports to shareholders and in Form N-CSR. The Fund’s annual shareholder report contains a discussion of the market conditions and investment strategies that significantly affected the Fund’s performance during its last fiscal year. In Form N-CSR, you will find the Fund’s annual and semi-annual financial statements.

Statement of Additional Information (SAI)

The SAI provides more detailed information about the Fund and is incorporated into this prospectus by reference and therefore is legally part of this prospectus.

This prospectus is not an offer to sell securities in places other than the United States, its territories, and those countries where shares of a Fund are registered for sale.

Investment Adviser

Harbor Capital Advisors, Inc.
111 South Wacker Drive, 34th Floor
Chicago, IL 60606-4302
312-443-4400

Distributor

Foreside Fund Services, LLC
Three Canal Plaza, Suite 100
Portland, ME 04101
484-320-6239

Shareholder Inquiries

P.O. Box 804660
Chicago, IL 60680-4108
800-422-1050

Obtain Documents

Free copies of the annual and semi-annual shareholder reports, the SAI, and other information, such as the Fund’s financial statements, are available:

	harborcapital.com
	800-422-1050
	Harbor ETF Trust P.O. Box 804660 Chicago, IL 60680-4108

Investors may get text-only copies:

	sec.gov
	[email protected] (for a fee)

Trustees & Officers

Charles F. McCain

Chairman, President & Trustee

Anne F. Ackerley

Trustee

Scott M. Amero

Trustee

Donna J. Dean

Trustee

Robert Kasdin

Trustee

Kathryn L. Quirk

Trustee

Douglas J. Skinner

Trustee

Ann M. Spruill

Trustee

Landis Zimmerman

Trustee

Diana R. Podgorny

Chief Legal Officer and

Chief Compliance Officer

Howard M. Reich

Treasurer

Ryan Elve

Vice President and

AML Compliance Officer

Walt O. Breuninger

Vice President

Kristof M. Gleich

Vice President

Diane J. Johnson

Vice President

Lora A. Kmieciak

Vice President

Dana Steiner

Vice President

Meredyth A. Whitford-Schultz

Secretary

Meredith S. Dykstra

Assistant Secretary

Lana M. Lewandowski

Assistant Secretary

Investment Company Act File No. 811-23661

ETF.PRO.[ ].[XX.XX]

CUSIP NUMBER	TICKER SYMBOL
Harbor Active Commodity ETF
[ ]	[ACOM]

Fund	Exchange	Ticker

Harbor Active Commodity ETF	NYSE Arca, Inc.	[ACOM]

Fund Summary
Harbor Active Commodity ETF	1
Additional Information about the Fund’s Investments
Investment Objective	6
Principal Investments	6
Non-Principal Investments	9
Exchange-Traded Fund Structure	9
Portfolio Turnover	10
Portfolio Holdings Disclosure Policy	10
The Advisor
Harbor Capital Advisors, Inc.	11
The Subadvisor
The Subadvisor	12
Shareholder Information
Valuing Fund Shares	13
Buying and Selling Shares	14
Distribution and Service (12b-1) Fees	14
Investing Through a Financial Intermediary	14
Book Entry	14
Frequent Purchases and Redemptions of Shares	14
Shareholder Actions	15
Investments by Registered Investment Companies	15
Note to Authorized Participants Regarding Continuous Offering	15

Shareholder and Account Policies
Dividends, Distributions and Taxes	16
Taxes on Creations and Redemptions of Creation Units	16
Cost Basis	17
For More Information
Fund Details	18