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iShares Trust

Supplement dated October 15, 2026 to the currently effective Summary Prospectus, Prospectus and Statement of Additional Information (the “SAI”) for the iShares ® iBonds ® Dec 2026 Term Corporate ETF* (IBDR) iShares ® iBonds ® Dec 2026 Term Treasury ETF* (IBTG) iShares ® iBonds ® 2026 Term High Yield and Income ETF* (IBHF) (each a “Fund” and together the “Funds”)

*The iShares iBonds Dec 2026 Term Corporate ETF, iShares iBonds Dec 2026 Term Treasury ETF and iShares iBonds 2026 Term High Yield and Income ETF may also conduct business as, respectively, the iBonds Dec 2026 Term Corporate ETF, iBonds Dec 2026 Term Treasury ETF and iBonds 2026 Term High Yield and Income ETF.

Shares of each Fund are listed and trade on a national securities exchange, as stated below (each a “Listing Exchange”):

Fund Listing Exchange iShares iBonds Dec 2026 Term Corporate ETF NYSE Arca, Inc.

iShares iBonds Dec 2026 Term Treasury ETF The Nasdaq Stock Market LLC

iShares iBonds 2026 Term High Yield and Income ETF Cboe BZX Exchange, Inc.

On June 23, 2016, December 3, 2019 and June 10, 2020, respectively, in connection with the establishment of the iShares iBonds Dec 2026 Term Corporate ETF, iShares iBonds Dec 2026 Term Treasury ETF and iShares iBonds 2026 Term High Yield and Income ETF, the Board of Trustees of the Trust approved the planned liquidation, dissolution and termination of the Funds. As a result, the last day of trading in each Fund on its Listing Exchange will be December 15, 2026. The Listing Exchanges will suspend trading in the Funds before the open of trading on December 16, 2026, and shares of the Funds will no longer be available for new investments as of this date. Proceeds of the liquidation are currently scheduled to be sent to shareholders on December 18, 2026. Each Fund’s final net asset value, as calculated on December 15, 2026, will include any costs associated with the liquidation expected to be borne by the Fund.

Because shares of each Fund will not be traded on its Listing Exchange during the period between December 16, 2026 and December 18, 2026, we cannot assure you that there will be a trading market for your shares. Further, during this period, each Fund will be in the process of closing down and liquidating its portfolio, which may result in the Fund not being able to track its Underlying Index (by December 16, 2026, the Underlying Index value will be represented almost entirely by cash as no securities will remain in the Underlying Index). After December 15, 2026, shareholders that remain invested in a Fund will receive the entire amount of their pro rata share of the liquidation proceeds on or about December 18, 2026, subject to their brokerage firm’s processes.

Shareholders may sell their holdings of a Fund prior to December 16, 2026 and may incur the usual and customary brokerage commissions associated with the sale of the Fund shares. If you still hold shares of a Fund on December 18, 2026, the Fund will automatically redeem your shares for cash based on the net asset value as of the close of business on December 15, 2026, which will include any dividends or distributions calculated as of that date.

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If you are subject to federal income tax, the liquidation of a Fund will result in one or more taxable events for you. A sale or exchange of Fund shares prior to the liquidation will generally give rise to a capital gain or loss to you for federal income tax purposes. In connection with the liquidation, a Fund may declare tax exempt or taxable distributions of its investment income and/or taxable distributions of its net capital gain. Any liquidation proceeds paid to you should generally be treated as received by you in exchange for your shares and will therefore generally give rise to a capital gain or loss depending on your tax basis. Please refer to the “Taxes” disclosure beginning on page 122 of each Fund’s SAI and consult your own tax advisor about the potential tax consequences of a Fund’s liquidation, including any state, local, foreign or other tax consequences.

If you have any questions, please call 1-800-iShares (1-800-474-2737).

iShares ® is a registered trademark of BlackRock Fund Advisors or its affiliates. IS-A-IBDR-IBTG-IBHF-1026

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

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iShares ®

iShares Trust Supplement dated June 23, 2026 to the currently effective Summary Prospectus, Prospectus and Statement of Additional Information (“SAI”) for the Funds listed in Appendix A (each a “Fund” and collectively, the “Funds”)

The following changes will take effect on or around June 30, 2026:

For the iShares iBonds 2026 Term High Yield and Income ETF, iShares iBonds 2027 Term High Yield and Income ETF, iShares iBonds 2028 Term High Yield and Income ETF, iShares iBonds 2029 Term High Yield and Income ETF, iShares iBonds 2030 Term High Yield and Income ETF, iShares iBonds 2031 Term High Yield and Income ETF, iShares iBonds 2032 Term High Yield and Income ETF and iShares iBonds 2033 Term High Yield and Income ETF, the following changes apply:

1. The last sentence of the fifth paragraph of the Principal Investment Strategies section of each Fund’s Summary Prospectus and Prospectus will be deleted and replaced with the following sentence:

In the final year of the Underlying Index’s term, any principal and interest paid by index constituents is treated as follows: (1) during the first six months of the final year, the Underlying Index reinvests proceeds pro-rata into the remaining bonds in the Underlying Index, and (2) during the last six months of the final year, interest and principal cash flows are not reinvested and are presumed to be held in cash while earning no interest.

2. The third sentence of the fourth paragraph of the section entitled “Bloomberg Index(es)” of the Construction and Maintenance of the Underlying Index section of each Fund’s SAI is deleted and replaced with the following sentence:

During the final six months of the final year, interest and principal cash flows are not reinvested and are assumed to be held in cash while earning no interest.

For the iShares iBonds Dec 2026 Term Corporate ETF, iShares iBonds Dec 2027 Term Corporate ETF, iShares iBonds Dec 2028 Term Corporate ETF, iShares iBonds Dec 2029 Term Corporate ETF, iShares iBonds Dec 2030 Term Corporate ETF and iShares iBonds Dec 2031 Term Corporate ETF, the following changes apply to each Fund’s Summary Prospectus and Prospectus:

1. The third and fourth sentences of the fifth paragraph and the entire sixth paragraph of the Principal Investment Strategies section will be deleted and replaced with the following sentences:

During this final six month period, the Underlying Index will no longer be updated or rebalanced and existing bond weights will be allowed to float based on changes in market value. During this period, interest and principal cash flows are not reinvested and are presumed to be held in cash while earning no interest throughout the remaining life of the Underlying Index.

For the iShares iBonds Dec 2032 Term Corporate ETF, iShares iBonds Dec 2033 Term Corporate ETF, iShares iBonds Dec 2034 Term Corporate ETF, iShares iBonds Dec 2035 Term Corporate ETF and iShares iBonds Dec 2036 Term Corporate ETF, the following changes apply to each Fund’s Summary Prospectus and Prospectus:

1. The third, fourth and fifth sentences of the fourth paragraph of the Principal Investment Strategies section will be deleted and replaced with the following sentences:

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For the iShares iBonds Dec 2026 Term Corporate ETF, iShares iBonds Dec 2027 Term Corporate ETF, iShares iBonds Dec 2028 Term Corporate ETF, iShares iBonds Dec 2029 Term Corporate ETF, iShares iBonds Dec 2030 Term Corporate ETF, iShares iBonds Dec 2031 Term Corporate ETF, the iShares iBonds Dec 2032 Term Corporate ETF, iShares iBonds Dec 2033 Term Corporate ETF, iShares iBonds Dec 2034 Term Corporate ETF and iShares iBonds Dec 2035 Term Corporate ETF, the following changes apply to each Fund’s SAI:

1. The third, fourth and fifth sentences of the second paragraph of the section entitled “Index Methodology for the iBonds Term Corporate ETFs’ Indexes” of the “Construction and Maintenance of the Underlying Index” section are deleted and replaced with the following sentences:

For the iShares iBonds Dec 2036 Term Corporate ETF, the following changes apply to the Fund’s SAI:

1. The third, fourth and fifth sentence of the second paragraph of the section entitled “Index Methodology” of the “Construction and Maintenance of the Underlying Index” section are deleted and replaced with the following sentences:

Appendix A

iShares iBonds 2026 Term High Yield and Income ETF iShares iBonds 2027 Term High Yield and Income ETF iShares iBonds 2028 Term High Yield and Income ETF iShares iBonds 2029 Term High Yield and Income ETF iShares iBonds 2030 Term High Yield and Income ETF iShares iBonds 2031 Term High Yield and Income ETF iShares iBonds 2032 Term High Yield and Income ETF iShares iBonds 2033 Term High Yield and Income ETF

iShares iBonds Dec 2026 Term Corporate ETF iShares iBonds Dec 2027 Term Corporate ETF iShares iBonds Dec 2028 Term Corporate ETF iShares iBonds Dec 2029 Term Corporate ETF iShares iBonds Dec 2030 Term Corporate ETF iShares iBonds Dec 2031 Term Corporate ETF iShares iBonds Dec 2032 Term Corporate ETF iShares iBonds Dec 2033 Term Corporate ETF iShares iBonds Dec 2034 Term Corporate ETF iShares iBonds Dec 2035 Term Corporate ETF iShares iBonds Dec 2036 Term Corporate ETF

If you have any questions, please call 1-800-iShares (1-800-474-2737).

iShares ® is a registered trademark of BlackRock Fund Advisors and its affiliates. IS-A-SUPP-iBonds-0626

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

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FEBRUARY 27, 2026

Summary Prospectus

• iShares iBonds 2026 Term High Yield and Income ETF* | IBHF | Cboe BZX

Before you invest, you may want to review the Fund’s prospectus, which contains more information about the Fund and its risks. You can find the Fund’s prospectus (including amendments and supplements) and other information about the Fund, including the Fund’s statement of additional information and shareholder reports, online at https://www.blackrock.com/prospectus. You can also get this information at no cost by calling 1-800-iShares (1-800-474-2737) or by sending an e-mail request to iSharesETFs@blackrock.com, or from your financial professional. The Fund’s prospectus and statement of additional information, both dated February 27, 2026, as amended and supplemented from time to time, are incorporated by reference into (legally made a part of) this Summary Prospectus. Information on the Fund’s net asset value, market price, premiums and discounts, and bid-ask spreads can be found at https://www.iShares.com.

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

*The iShares iBonds 2026 Term High Yield and Income ETF may also conduct business as the iBonds 2026 Term High Yield and Income ETF.

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iSHARES ® iBONDS ® 2026 TERM HIGH YIELD AND INCOME ETF

Ticker: IBHF Stock Exchange: Cboe BZX

Investment Objective

The iShares iBonds 2026 Term High Yield and Income ETF (the “Fund”) seeks to track the investment results of an index composed of U.S. dollar-denominated, high yield and other income generating corporate bonds maturing in 2026.

Fees and Expenses

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. Amounts in the table are rounded to the nearest basis point, which in some cases may be “0.00.” The investment advisory agreement between iShares Trust (the “Trust”) and BlackRock Fund Advisors (“BFA”) (the “Investment Advisory Agreement”) provides that BFA will pay all operating expenses of the Fund, except: (i) the management fees, (ii) interest expenses, (iii) taxes, (iv) expenses incurred with respect to the acquisition and disposition of portfolio securities and the execution of portfolio transactions, including brokerage commissions, (v) distribution fees or expenses, and (vi) litigation expenses and any extraordinary expenses.

The Fund may incur “Acquired Fund Fees and Expenses.” Acquired Fund Fees and Expenses reflect the Fund’s pro rata share of the fees and expenses incurred indirectly by the Fund as a result of investing in other investment companies. The impact of Acquired Fund Fees and Expenses is included in the Fund’s total return but is not included in the Fund’s ratio of expenses to average net assets. Both figures are shown in the Financial Highlights section of the Fund’s prospectus (the “Prospectus”). BFA, the investment adviser to the Fund, has contractually agreed to waive a portion of its management fees in an amount equal to the Acquired Fund Fees and Expenses, if any, attributable to investments by the Fund in other funds advised by BFA or its affiliates through the termination date of the Fund, on or about December 15, 2026. The contractual waiver may be terminated prior to the Fund’s termination only upon the written agreement of the Trust and BFA.

You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Annual Fund Operating Expenses (ongoing expenses that you pay each year as a 1 percentage of the value of your investments) 1

Management Fees

Distribution and Service (12b-1) Fees Other Expenses

Acquired Fund Fees and Expenses

Total Annual Fund Operating Expenses

Fee Waiver and/or Expense Reimbursement

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement 0.35% None 0.00% 0.00% 0.35% (0.00)% 0.35%

1 Operating expenses paid by BFA under the Investment Advisory Agreement exclude Acquired Fund Fees and Expenses, if any. Example. This Example is intended to help you compare the cost of owning shares of the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. Fund expenses (and any applicable waivers) are calculated only through December 15, 2026 because the Fund is scheduled to cease operations and liquidate by that date. The 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, based on these assumptions, your costs would be:

Maturity $29

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Portfolio Turnover. The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 70% of the average value of its portfolio.

Principal Investment Strategies

The Fund seeks to meet its investment objective generally by investing in component securities of the Bloomberg 2026 Term High Yield and Income Index (the “Underlying Index”). The Fund may also invest in U.S. government securities, short-term paper, cash and cash equivalents, including shares of money market funds advised by BFA or its affiliates.

The Fund is a term fund that will terminate on or about December 15, 2026, at which time it will distribute its remaining net assets to shareholders pursuant to a plan of liquidation. The Fund does not seek to return any predetermined amount at maturity or in periodic distributions. The Underlying Index is composed of U.S. dollar-denominated, taxable, fixed-rate, high yield (which are considered below investment-grade) and BBB or equivalently rated (as determined by Bloomberg Index Services Limited (the “Index Provider” or “Bloomberg”)) corporate bonds scheduled to mature between January 1, 2026 and December 15, 2026, inclusive. Securities eligible for inclusion in the Underlying Index are selected from a universe of corporate issuers ( e.g., industrial, financial institutions, utilities) determined by Bloomberg. As of October 31, 2025, a significant portion of the Underlying Index is represented by securities of companies in the consumer goods and services and industrial industries or sectors. The components of the Underlying Index are likely to change over time.

The bonds in the Underlying Index have $250 million or more of outstanding face value at the time of inclusion. The non-U.S. corporate issuers included in the Underlying Index consist primarily of corporate bonds issued by companies domiciled in developed countries. The Fund will invest in non-U.S. issuers to the extent necessary for it to track the Underlying Index. Each bond included in the Underlying Index must be registered with the SEC, have been exempt from registration at issuance, or have been offered pursuant to Rule 144A under the Securities Act of 1933, as amended (the “1933 Act”). Subject to the methodology of the Underlying Index discussed below, the securities in the Underlying Index may carry a coupon that steps-up according to a predetermined schedule ( i.e., the interest rate paid on such securities will increase over time). Securities are market-cap weighted within the Underlying Index, with a 3% cap typically imposed on any one issuer, and a pro rata distribution of any excess weight across the remaining issuers in the Underlying Index.

The securities in the Underlying Index are updated on the last calendar day of each month until six months before maturity, with the last rebalance date on June 30, 2026.

The Underlying Index consists of bonds chosen from two sub indices, the Bloomberg U.S. High Yield Index (the “High Yield Index”) and the Bloomberg U.S. Corporate Index (the “Corporate

Index”), both of which are stripped of securities maturing outside of the maturity range defined above. BBB-rated bonds from the Corporate Index will be introduced to the Underlying Index under the following conditions: (1) in the last 1.5 years but before the last 6 months of the Underlying Index’s term, the Underlying Index will introduce BBB-rated bonds (which are considered investment grade) as constituent high yield bonds (which are considered below investment-grade) are called, no longer qualify for inclusion (due to, among other factors, sector reclassifications of issuers, changes in the credit rating of bonds included in the Underlying Index or rebalances to maintain issuer limits), or decline in value compared to a reference point set at 1.5 years from the Underlying Index’s term or (2) if, prior to the last 1.5 years remaining in the Underlying Index’s term, the market value of the high yield bonds in the Underlying Index declines below $30 billion, the Underlying Index will add BBB-rated bonds to maintain a $30 billion minimum market value for the Underlying Index. In the final year of the Underlying Index’s term, any principal and interest paid by index constituents is treated as follows: (1) during the first six months of the final year, the Underlying Index reinvests proceeds pro-rata into the remaining bonds in the Underlying Index, and (2) during the last six months of the final year, principal is not reinvested and is presumed to be held in cash while earning no interest.

Bonds with a clean price ( i.e ., the price does not include accrued interest between coupon payments) below $60 are excluded from the Underlying Index and subject to a 3 month lock-out period before they are eligible for inclusion again at rebalance. During the final 1.5 years of the maturity of the index, bonds that fall below $60 at rebalance will be permanently ineligible for the Underlying Index.

In addition, to be included in the Underlying Index, securities that are rated by all three of the rating agencies named below must be rated “high yield” to be selected from the High Yield Index and “BBB” to be selected from the Corporate Index. The bonds from the High Yield Index must have a rating equal to or below “Ba1”/”BB+”/”BB+” and above “CC”. The bonds from the Corporate Index must have a rating of “BBB” (or equivalent). The Index Provider will use the middle rating of Moody’s Investors Service, Inc. (“Moody’s”), Standard & Poor’s ® Global Ratings, a subsidiary of S&P Global (“S&P Global Ratings”) and Fitch Ratings, Inc. (“Fitch”); when a rating from only two agencies is available, the lower is used; when only one agency rates a bond, that rating is used. In cases where ratings are not available, other sources may be used to classify bonds by investment quality.

The Fund is a series of the iShares iBonds fixed maturity series of bond ETFs sponsored by BlackRock, Inc. (“BlackRock”). The Fund does not invest in U.S. savings bonds or other U.S. government bonds (except to the extent the Fund holds cash equivalent instruments consistent with its investment objective) and is not designed to provide protection against inflation.

BFA uses an indexing approach to try to achieve the Fund’s investment objective. The Fund does not try to “beat” the index it tracks and does not seek temporary defensive positions when markets decline or appear overvalued.

Indexing may eliminate the chance that the Fund will substantially outperform the Underlying Index but also may reduce some of the risks of active management, such as poor security selection.

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Indexing seeks to achieve lower costs and better after-tax performance by aiming to keep portfolio turnover low in comparison to actively managed investment companies.

BFA uses a representative sampling indexing strategy to manage the Fund. “Representative sampling” is an indexing strategy that involves investing in a representative sample of securities or other instruments that collectively has an investment profile similar to that of an applicable underlying index. The instruments selected are expected to have, in the aggregate, investment characteristics (based on factors such as market value and industry weightings), fundamental characteristics (such as return variability, duration ( i.e. , an instrument’s price sensitivity to a change in interest rates), maturity or credit ratings and yield) and liquidity measures similar to those of an applicable underlying index. The Fund may or may not hold all of the components of the Underlying Index.

The Fund will invest at least 80% of its assets in the component instruments of the Underlying Index, and (except during the last twelve months of the Fund’s operations) the Fund will invest at least 90% of its assets in fixed income securities of the types included in the Underlying Index that BFA believes will help the Fund track the Underlying Index. The Fund will invest no more than 10% of its assets in futures, options and swaps contracts that BFA believes will help the Fund track the Underlying Index as well as in fixed income securities other than the types included in the Underlying Index, but which BFA believes will help the Fund track the Underlying Index. Cash and cash equivalent investments associated with a derivative position will be treated as part of that position for the purposes of calculating the percentage of investments included in the Underlying Index.

In the last six months of operation, as the bonds held by the Fund mature, the proceeds may not be reinvested by the Fund in bonds but instead will be held in cash and cash equivalents. By fifteen days prior to maturity, the Underlying Index is expected to consist almost entirely of cash and cash equivalents. On or around this date, the Fund will wind up and terminate. After appropriate provision is made for any Fund liabilities, its net assets will be distributed to then-current shareholders pursuant to a plan of liquidation. The Fund’s termination was approved by a majority of the Trust’s Board of Trustees (the “Board”) and does not require additional approval by Fund shareholders. The Board may extend the termination date if a majority of the Board determines the extension to be in the best interest of the Fund.

The Fund seeks to track the investment results of the Underlying Index before fees and expenses of the Fund. To the extent that the Fund invests in money market or similar funds, it will incur the fees and expenses of such funds.

The Fund should not be confused with a target date fund, which has assets that are managed according to a particular investment strategy that converts fund assets to conservative investments over time.

The Fund may lend securities representing up to one-third of the value of the Fund’s total assets (including the value of any collateral received).

The Underlying Index is sponsored by Bloomberg, which is independent of the Fund and BFA. The Index Provider determines the composition and relative weightings of the

components of the Underlying Index and publishes information regarding the market value of the Underlying Index.

Industry Concentration Policy. The Fund will concentrate its investments ( i.e. , hold 25% or more of its total assets) in a particular industry or group of industries to approximately the same extent that the Underlying Index is concentrated. For purposes of this limitation, securities of the U.S. government (including its agencies and instrumentalities), repurchase agreements collateralized by U.S. government securities, and securities of state or municipal governments and their political subdivisions are not considered to be issued by members of any industry.

Summary of Principal Risks

As with any investment, you could lose all or part of your investment in the Fund, and the Fund’s performance could trail that of other investments. The Fund is subject to certain risks, including the principal risks noted below, any of which may adversely affect the Fund’s net asset value per share (“NAV”), trading price, yield, total return and ability to meet its investment objective. Certain key risks are prioritized below (with others following in alphabetical order), but the relative significance of any risk is difficult to predict and may change over time. You should review each risk factor carefully.

High Yield Securities Risk. Debt securities that are rated below investment grade (commonly referred to as “junk bonds”) and debt securities that are unrated are generally considered to be speculative. Compared to higher-quality debt securities, high yield securities are subject to a greater risk of default, illiquidity, price volatility and valuation uncertainty. Such investments may be subject to additional risks including subordination to other creditors, no collateral or limited rights in collateral, lack of a regular trading market, prepayment risk, and lack of publicly available information.

Credit Risk . Credit risk is the risk that an issuer, guarantor or liquidity provider of a fixed-income security may be unable or unwilling, or may be perceived as unable or unwilling, to make timely principal and/or interest payments or to otherwise honor its obligations. The credit rating assigned to a security or its issuer does not necessarily reflect the issuer’s current financial condition or an investment’s volatility or liquidity. An actual or perceived decline in an issuer’s creditworthiness may result in a decrease in the value and liquidity of its securities as well as greater price volatility, which may make it difficult to sell the securities. The Fund may be adversely affected if an investment that it holds experiences a downgrade or a default.

Income Risk. The Fund’s income may decline due to falling interest rates or other factors. This can occur because the Fund may be required to invest in lower-yielding bonds when a bond in the Fund’s portfolio matures, is near maturity, is called or is prepaid, when bonds in the Underlying Index are substituted, or when the Fund otherwise needs to purchase additional bonds. The Index Provider’s substitution of bonds in the Underlying Index may occur, for example, when the time to maturity for the bond no longer matches the Underlying Index’s stated maturity guidelines.

Market Risk . The Fund could lose money over short periods due to short-term market movements and over longer periods during

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more prolonged market downturns. Local, regional or global events such as war, acts of terrorism, pandemics or other public health issues, recessions, the prospect or occurrence of a sovereign default or other financial crisis, or other events could have a significant impact on the Fund and its investments and could result in increased premiums or discounts to the Fund’s NAV.

Index-Related Risk. The Index Provider may rely on various sources of information to assess the criteria of components of the Underlying Index, including information that may be based on assumptions and estimates. Neither the Fund nor BFA can offer assurances that the Index Provider’s methodology or sources of information will provide an accurate assessment of included components or will result in the Fund meeting its investment objective. Errors in index data, index computations or the construction of the Underlying Index in accordance with its methodology may occur, and the Index Provider may not identify or correct them promptly or at all, which may have an adverse impact on the Fund and its shareholders. Unusual market conditions or other unforeseen circumstances (such as natural disasters, political unrest or war) may impact the Index Provider or a third-party data provider and could cause the Index Provider to postpone a scheduled rebalance. This could cause the Underlying Index to vary from its normal or expected composition.

Asset Class Risk. The securities and other assets in the Underlying Index or in the Fund’s portfolio may underperform in comparison to financial markets generally, a particular financial market, another index, or other asset classes.

Authorized Participant Concentration Risk. An “Authorized Participant” is a member or participant of a clearing agency registered with the SEC, which has a written agreement with the Fund or one of its service providers that allows the Authorized Participant to place orders for the purchase and redemption of creation units (“Creation Units”). Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund. There are a limited number of institutions that may act as Authorized Participants for the Fund, including on an agency basis on behalf of other market participants. No Authorized Participant is obligated to engage in creation or redemption transactions. To the extent that Authorized Participants exit the business or do not place creation or redemption orders for the Fund and no other Authorized Participant places orders, Fund shares are more likely to trade at a premium or discount to NAV and possibly face trading halts or delisting.

Call Risk . During periods of falling interest rates, an issuer of a callable debt obligation held by the Fund may “call” or repay the debt obligation before its stated maturity, and the Fund may have to reinvest the proceeds in instruments with lower yields, which would result in a decline in the Fund’s income, or in instruments with greater risks or with other less favorable features.

Cash Management Risk . If a significant amount of the Fund’s assets is invested in cash and cash equivalents, the Fund may underperform other funds that do not similarly invest in cash and cash equivalents for investment purposes and/or to collateralize derivative instruments. Further, the Fund may face increased credit risk with respect to the bank or other counterparty holding such assets and the risk that the counterparty may be unable or unwilling (or perceived as such) to honor its obligations.

Concentration Risk. The Fund may be susceptible to an increased risk of loss, including losses due to adverse events that affect the Fund’s investments more than the market as a whole, to the extent that the Fund’s investments are concentrated in the securities or other assets of one or more issuers, countries or other geographic units, markets, industries, project types, or asset classes.

Consumer Goods and Services Companies Risk. Consumer goods and services companies face risks related to changes in consumer preferences and disposable income, commodity prices, government regulation, supply chain disruptions, damage to brand or reputation, economic slowdown and labor shortages, among other things.

Declining Yield Risk. In the months leading up to the Fund’s planned termination date, the Fund’s yield may move toward prevailing money market rates and may be lower than the yields of the bonds previously held by the Fund and lower than prevailing yields for bonds in the market.

Fluctuation of Yield and Liquidation Amount Risk . The Fund, unlike a direct investment in a bond that has a level coupon payment and a fixed payment at maturity, will make distributions of income that vary over time. It is expected that an investment in the Fund, if held through maturity, will produce aggregate returns comparable to a direct investment in a group of bonds of similar credit quality and maturity. Unlike a direct investment in bonds, the breakdown of returns between Fund distributions and liquidation proceeds are not predictable at the time of your investment. For example, at times during the Fund’s existence it may make distributions at a greater (or lesser) rate than the coupon payments received on the Fund’s portfolio, which would result in the Fund returning a lesser (or greater) amount on liquidation than would otherwise be the case. The rate of Fund distribution payments may adversely affect the tax characterization of your returns from an investment in the Fund relative to a direct investment in bonds. If the amount you receive as liquidation proceeds upon the Fund’s termination is higher or lower than your cost basis, you may experience a gain or loss for tax purposes.

Illiquid Investments Risk . An illiquid investment is any investment that the Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without significantly changing the market value of the investment. To the extent the Fund holds illiquid investments, the illiquid investments may reduce its returns because the Fund may be unable to transact at advantageous times or prices. In addition, if the Fund is limited in its ability to sell illiquid investments during periods when shareholders are redeeming their shares, it will need to sell liquid securities to meet redemption requests and illiquid securities will become a larger portion of the Fund’s holdings. During periods of market volatility, liquidity in the market for Fund shares may be impacted by the liquidity in the market for the underlying securities or other assets held by the Fund, which could lead to Fund shares trading at a premium or discount to the Fund’s NAV.

Industrial Companies Risk. Industrial companies face a number of risks, including supply chain and distribution disruptions, business interruptions, product obsolescence, third-party vendor risks, cyber attacks, trade disputes, product recalls, liability

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claims, scarcity of materials or parts, excess capacity, changes in consumer preferences, and volatility in commodity prices and currencies. The performance of such companies may also be affected by technological developments, labor relations, legislative and regulatory changes, government spending policies, and changes in domestic and international economies.

Interest Rate Risk . Interest rate risk refers to the risk of fluctuations in the value of a fixed-income security due to changes in the general level of interest rates. Interest rate changes can be sudden and unpredictable and are influenced by a number of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, and supply and demand for fixed-income securities. An increase in interest rates generally will cause the value of fixed-income securities to decline. Securities with longer maturities generally are more sensitive to interest rate changes and subject to greater fluctuations in value. Changes in interest rates may have unpredictable effects on fixed-income markets and result in heightened volatility and lower liquidity for certain instruments, which may adversely affect a Fund’s performance. During periods of very low or negative interest rates, a Fund may be unable to maintain positive returns or pay dividends to shareholders.

Issuer Risk . The performance of the Fund depends on the performance of individual securities or other assets to which the Fund has exposure. The value of securities or other assets may decline, or perform differently from the market as a whole, due to changes in the financial condition or credit rating of the issuer or counterparty.

Management Risk . The Fund generally does not attempt to take defensive positions under any market conditions, including declining markets. As the Fund will not fully replicate the Underlying Index and may hold securities or other assets not included in the Underlying Index, it is subject to the risk that the investment strategy of BFA may not produce the intended results. There is no guarantee that the Fund’s investment results will have a high degree of correlation to those of the Underlying Index or that the Fund will achieve its investment objective.

Market Trading Risk . The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares (including through a trading halt), losses from trading in secondary markets, periods of high volatility, and disruptions in the process of creating and redeeming Fund shares. Any of these factors, among others, may lead to the Fund’s shares trading in the secondary market at a premium or discount to NAV or to the intraday value of the Fund’s portfolio holdings. If you buy Fund shares at a time when the market price is at a premium to NAV or sell Fund shares at a time when the market price is at a discount to NAV, you may pay significantly more or receive significantly less than the underlying value of the Fund shares.

Operational and Technology Risks . The Fund is directly and indirectly susceptible to operational and technology risks, including those related to human errors, processing errors, communication errors, systems failures, cybersecurity incidents, and the use of artificial intelligence and machine learning (“AI”), which may result in losses for the Fund and its shareholders or may impair the Fund’s operations. While the Fund’s service providers are required to have appropriate operational, information security and cybersecurity risk management policies

and procedures, their methods of risk management may differ from those of the Fund. Operational and technology risks for the issuers in which the Fund invests could also result in material adverse consequences for such issuers and may cause the Fund’s investments in such issuers to lose value.

Privately Issued Securities Risk. Privately issued securities are securities that have not been registered under the 1933 Act. Such securities typically are subject to legal restrictions on resale and generally are not traded in established public markets. As a result, privately issued securities may be deemed to be illiquid investments, may be more difficult to value than publicly traded securities, may be subject to wide fluctuations in value and may have higher transaction costs. There can be no assurance that a trading market will exist at any time for any particular privately issued security. Difficulty in selling such securities at a desirable time or price may result in a loss to the Fund.

Reinvestment Risk . The Fund may invest a portion of its assets in short-term fixed-income instruments and, as a result, may be adversely affected if interest rates fall because it may have to invest in lower-yielding instruments as bonds in the Fund’s portfolio mature.

Reliance on Trading Partners Risk . The Fund invests in countries or regions whose economies are heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund’s investments. Through its holdings of securities of certain issuers, the Fund is specifically exposed to Asian Economic Risk and North American Economic Risk . Risk of Investing in the U.S . Investing in U.S. issuers subjects the Fund to legal, regulatory, political, currency, security, and economic risks that are specific to the U.S. Certain changes in the U.S., such as a weakening of the U.S. economy or a decline in its financial markets, may have an adverse effect on U.S. issuers.

Securities Lending Risk. The Fund may engage in securities lending. Securities lending involves the risk that the Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. The Fund could also lose money in the event of a decline in the value of collateral provided for loaned securities or a decline in the value of any investments made with cash collateral. These events could also trigger adverse tax consequences for the Fund.

Tracking Error Risk . The Fund may be subject to “tracking error,” which is the divergence of the Fund’s performance from that of the Underlying Index. Tracking error may occur due to a number of factors, including differences between the securities and other assets held in the Fund’s portfolio and those included in the Underlying Index; differences in the timing and methodologies used to value securities and other assets; transaction costs and other expenses incurred by the Fund that the Underlying Index does not incur; the Fund’s holding of uninvested cash; differences in the timing of the accrual or the valuation of dividends or interest received by the Fund or distributions paid to Fund shareholders; tax gains or losses; differences between the amount and/or timing of withholding taxes on dividends reflected in the Underlying Index from the Fund’s obligation, if any, for foreign withholding taxes; the requirements for the Fund to maintain pass-through tax treatment; portfolio transactions carried out to minimize the distribution of capital gains to

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shareholders; the acceptance of custom baskets; changes to the Underlying Index; and impacts to the Fund of complying with certain regulatory requirements or limits. Tracking error risk may be heightened during times of increased market volatility or other unusual market conditions. A Fund that tracks an index where high yield securities are an investment focus may experience higher tracking error than ETFs that do not track such indexes. A Fund that tracks an index with exposure to non-U.S. issuers may experience higher tracking error than ETFs that do not track such indexes.

Valuation Risk . The price that the Fund could receive upon the sale (or other disposition) of a security or other asset may differ from the Fund’s valuation of the security or other asset, particularly for securities or other assets that trade in low volume

or volatile markets or that are valued using a fair value methodology. The price received by the Fund also may differ from the value used by the Underlying Index. In addition, the value of the securities or other assets in the Fund’s portfolio may change on days or during time periods when investors are not able to purchase or sell Fund shares. Authorized Participants that create or redeem Fund shares on days when the Fund is holding fair valued securities or other assets may receive fewer or more shares, or lower or higher redemption proceeds, than they would have received had the securities or other assets not been fair valued or been valued using a different methodology. The ability to value investments may be impacted by technological issues or errors by pricing services or other third-party service providers.

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Performance Information

The performance information below illustrates how the Fund’s performance has varied over different periods and provides some indication of the risks of investing in the Fund. The bar chart shows how the performance of the Fund has varied from one calendar year to another over the periods shown. The table compares the Fund’s performance to that of an appropriate broad-based securities market index and the Underlying Index. Returns assume the reinvestment of any dividends and distributions. The Fund’s returns reflect the impact of any agreements to waive or reimburse expenses, which would reduce performance if not in effect. Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information, including the Fund’s current NAV, may be obtained by visiting www.iShares.com or by calling 1-800-iShares (1-800-474-2737) (toll free).

Calendar Year-by-Year Returns

15% 10% 5% 0% -5% -10%

2 0 21 2 0 22 2 0 2 3 2 0 2 4 2 0 2 5

4.77%

-7.01%

10.96% 8.45% 6.65%

Return (%) Period Ended During the periods shown in the chart: Best Quarter 4.26% December 31, 2023 Worst Quarter -8.13% June 30, 2022

Average Annual Total Returns (for the periods ended December 31, 2025)

One Year Five Years

Since Fund Inception (Inception Date: 11/10/2020) Return Before Taxes 6.65% 4.57% 4.82% Return After Taxes on Distributions 3.78% 1.90% 2.17% Return After Taxes on Distributions and Sale of Fund Shares 3.89% 2.30% 2.50% Bloomberg U.S. Universal Index (Returns do not reflect deductions for fees, expenses or taxes) 7.58% 0.06% 0.33% Bloomberg 2026 Term High Yield and Income Index (Returns do not reflect deductions for fees, expenses or taxes) 7.16% 4.92% 5.21%

After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to tax-exempt investors or investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). Fund returns after taxes on distributions and sales of Fund shares are calculated assuming that an investor has sufficient capital gains of the same character from other investments to offset any capital losses from the sales of Fund shares. As a result, Fund returns after taxes on distributions and sales of Fund shares may exceed Fund returns before taxes and/or returns after taxes on distributions.

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Management

Investment Adviser. BlackRock Fund Advisors.

Portfolio Managers. Jonathan Graves, James Mauro and Marcus Tom (the “Portfolio Managers”) are primarily responsible for the day-to-day management of the Fund. Each Portfolio Manager supervises a portfolio management team. Mr. Graves, Mr. Mauro and Mr. Tom have been Portfolio Managers of the Fund since 2025, 2020 and 2025, respectively.

Purchase and Sale of Fund Shares

The Fund is an ETF. Individual shares of the Fund may only be bought and sold in the secondary market through a broker-dealer. Because ETF shares trade at market prices rather than at NAV, shares may trade at a price greater than NAV (a premium) or less than NAV (a discount). An investor may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase shares of the Fund (bid) and the lowest price a seller is willing to accept for shares of the Fund (ask) when buying or selling shares in the secondary market (the “bid-ask spread”).

Tax Information

The Fund intends to make distributions that may be taxable to you as ordinary income or capital gains, unless you are investing through a tax-deferred arrangement such as a 401(k) plan or an IRA, in which case, your distributions generally will be taxed when withdrawn.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase shares of the Fund through a broker-dealer or other financial intermediary (such as a bank), BFA or other related companies may pay the intermediary for marketing activities and presentations, educational training programs, conferences, the development of technology platforms and reporting systems or other services related to the sale or promotion of the Fund. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

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For more information visit www.iShares.com or call 1-800-474-2737

Investment Company Act file No.: 811-09729

IS-SP-IBHF-0226

Go paperless. . . It’s Easy, Economical and Green! Go to www.icsdelivery.com

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        "text": "Because shares of each Fund will not be traded on its Listing Exchange during the period between"
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        "text": "2026, the Underlying Index value will be represented almost entirely by cash as no securities will remain"
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        "text": "Shareholders may sell their holdings of a Fund prior to December 16, 2026 and may incur the usual and"
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        "text": "customary brokerage commissions associated with the sale of the Fund shares. If you still hold shares of"
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        "text": "distributions calculated as of that date."
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        "id": "31bb90b1-182f-4743-8489-2eb2834cb106",
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