ThZeal - The Zeal

BLACKROCK EUROFUND

OCTOBER 28, 2024

Summary Prospectus

BlackRock EuroFund | Investor, Institutional and Class R Shares

Investor A: MDEFX • Investor C: MCEFX • Institutional: MAEFX • Class R: MREFX

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), reports to shareholders and other information about the Fund, including the Fund’s statement of additional information, online at https://www.blackrock.com/prospectus. You can also get this information at no cost by calling (800) 441-7762 or by sending an e-mail request to prospectus.request@blackrock.com, or from your financial professional. The Fund’s prospectus and statement of additional information, both dated October 28, 2024, as amended and supplemented from time to time, are incorporated by reference into (legally made a part of) this Summary Prospectus.

This Summary Prospectus contains information you should know before investing, including information about risks. Please read it before you invest and keep it for future reference.

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

Not FDIC Insured ● May Lose Value ● No Bank Guarantee

Summary Prospectus

Key Facts About BlackRock EuroFund

Investment Objective

The investment objective of BlackRock EuroFund (the “Fund”) is to seek capital appreciation primarily through investment in equities of corporations domiciled in European countries.

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 your financial professional or your selected securities dealer, broker, investment adviser, service provider or industry professional (including BlackRock Advisors, LLC (“BlackRock”) and its affiliates) (each, a “Financial Intermediary”), which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the fund complex advised by BlackRock or its affiliates. More information about these and other discounts is available from your Financial Intermediary and in the “Details About the Share Classes” and the “Intermediary-Defined Sales Charge Waiver Policies” sections on pages 25 and A-1, respectively, of the Fund’s prospectus and in the “Purchase of Shares” section on page II-93 of Part II of the Fund’s Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)	Investor A Shares	Investor C Shares	Institutional Shares	Class R Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.25%	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	None1	1.00%2	None	None
Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)	Investor A Shares	Investor C Shares	Institutional Shares	Class R Shares
Management Fee3	0.75%	0.75%	0.75%	0.75%
Distribution and/or Service (12b-1) Fees	0.25%	1.00%	None	0.50%
Other Expenses	0.50%	0.59%	0.52%	0.67%
Total Annual Fund Operating Expenses	1.50%	2.34%	1.27%	1.92%
Fee Waivers and/or Expense Reimbursements3,4	(0.16)%	(0.25)%	(0.18)%	(0.33)%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements3,4	1.34%	2.09%	1.09%	1.59%

A contingent deferred sales charge (“CDSC”) of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1,000,000 or more.

There is no CDSC on Investor C Shares after one year.

As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 41, BlackRock has contractually agreed to waive the management fee with respect to any portion of the Fund’s assets estimated to be attributable to investments in other equity and fixed-income mutual funds and exchange-traded funds (“ETFs”) managed by BlackRock or its affiliates that have a contractual management fee, through June 30, 2026. In addition, BlackRock has contractually agreed to waive its management fees by the amount of investment advisory fees the Fund pays to BlackRock indirectly through its investment in money market funds managed by BlackRock or its affiliates, through June 30, 2026. The contractual agreements may be terminated upon 90 days’ notice by a majority of the non-interested trustees of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.

As described in the “Management of the Fund” section of the Fund’s prospectus beginning on page 41, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 1.29% (for Investor A Shares), 2.04% (for Investor C Shares), 1.04% (for Institutional Shares) and 1.54% (for Class R Shares) of average daily net assets through June 30, 2026. The contractual agreement may be terminated upon 90 days’ notice by a majority of the non-interested trustees of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. 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:

	1 Year	3 Years	5 Years	10 Years
Investor A Shares	$654	$959	$1,286	$2,209
Investor C Shares	$312	$707	$1,228	$2,447
Institutional Shares	$111	$385	$680	$1,518
Class R Shares	$162	$571	$1,006	$2,217

You would pay the following expenses if you did not redeem your shares:

	1 Year	3 Years	5 Years	10 Years
Investor C Shares	$212	$707	$1,228	$2,447

Portfolio Turnover:

The Fund pays 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 shares are held in a taxable account. These costs, which are not reflected in 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 32% of the average value of its portfolio.

Principal Investment Strategies of the Fund

Under normal circumstances, the Fund will invest at least 80% of its net assets in equity securities, including common stock and convertible securities, of companies located in Europe. For these purposes, “net assets” include any borrowings for investment purposes. Equity securities include common stock, preferred stock or securities or other instruments whose price is linked to the value of common stock. Common stock are securities representing shares of ownership of a corporation. Convertible securities are securities, such as corporate bonds or preferred stock, that are exchangeable for shares of common stock of the issuer or another company. The Fund may also purchase convertible securities.

The Fund may invest in companies of any size. The Fund has no limits on the geographic asset distribution of its investments within Europe. However, the Fund currently expects that a majority of the Fund’s assets will be invested in equity securities of companies located in countries participating in the European Monetary Union (the “Eurozone”). Other exposure may include, without limitation, investments in companies located in European Union Member States that Fund management believes are likely to join the Eurozone in the foreseeable future and in companies based elsewhere that exercise the predominant part of their economic activity in Eurozone countries.

Principal Risks of Investing in the Fund

Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of the principal risks of investing in the Fund. The relative significance of each risk factor below may change over time and you should review each risk factor carefully.

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Equity Securities Risk — Stock markets are volatile. The price of equity securities fluctuates based on changes in a company’s financial condition and overall market and economic conditions.

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Foreign Securities Risk — Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:

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The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.

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Changes in foreign currency exchange rates can affect the value of the Fund’s portfolio.

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The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.

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The governments of certain countries, or the U.S. Government with respect to certain countries, may prohibit or impose substantial restrictions through capital controls and/or sanctions on foreign investments in the capital markets or certain industries in those countries, which may prohibit or restrict the ability to own or transfer currency, securities, derivatives or other assets.

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Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.

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Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.

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The Fund’s claims to recover foreign withholding taxes may not be successful, and if the likelihood of recovery of foreign withholding taxes materially decreases, due to, for example, a change in tax regulation or approach in the foreign country, accruals in the Fund’s net asset value for such refunds may be written down partially or in full, which will adversely affect the Fund’s net asset value.

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The European financial markets have recently experienced volatility and adverse trends due to concerns about economic downturns in, or rising government debt levels of, several European countries as well as acts of war in the region. These events may spread to other countries in Europe and may affect the value and liquidity of certain of the Fund’s investments.

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Geographic Concentration Risk — From time to time the Fund may invest a substantial amount of its assets in issuers located in a single country or a limited number of countries. If the Fund concentrates its investments in this manner, it assumes the risk that economic, political and social conditions in those countries will have a significant impact on its investment performance. The Fund’s investment performance may also be more volatile if it concentrates its investments in certain countries, especially emerging market countries.

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Convertible Securities Risk — The market value of a convertible security performs like that of a regular debt security; that is, if market interest rates rise, the value of a convertible security usually falls. In addition, convertible securities are subject to the risk that the issuer will not be able to pay interest, principal or dividends when due, and their market value may change based on changes in the issuer’s credit rating or the market’s perception of the issuer’s creditworthiness. Since it derives a portion of its value from the common stock into which it may be converted, a convertible security is also subject to the same types of market and issuer risks that apply to the underlying common stock, including the potential for increased volatility in the price of the convertible security.

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Focus Risk — Under normal circumstances, the Fund focuses its investments in the securities of a limited number of issuers. This may subject the Fund to greater issuer-specific risk and potential losses than a fund that invests in the securities of a greater number of issuers.

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Industrials Sector Risk — Companies in the industrials sector may be adversely affected by changes in the supply of and demand for products and services, product obsolescence, claims for environmental damage or product liability and changes in general economic conditions, among other factors.

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Investment in a Particular Geographic Region or Country Risk — France — The Fund’s investment in French issuers subjects the Fund to legal, regulatory, political, currency, security, and economic risks specific to France. Ongoing concerns in relation to the economic health of the European Union (the “EU”) continue to constrain the economic resilience of certain EU member states, including France. Interest rates on France’s debt may rise to levels that make it difficult for it to service high debt levels without significant financial help from, among others, the European Central Bank and could potentially result in default. In addition, the French economy is dependent to a significant extent on the economies of certain key trading partners, including Germany and other Western European countries. Reduction in spending on French products and services, or changes in any of the economies may cause economic adversity in France. In addition, France has been subject to acts of terrorism, which has created a climate of insecurity that has been detrimental to tourism and may lead to further adverse economic consequences. The French economy is dependent on exports from the agricultural sector. Leading agricultural exports include dairy products, meat, wine, fruit and vegetables, and fish. As a result, the French economy is susceptible to fluctuations in demand for agricultural products. In addition, Russia launched a large-scale invasion of Ukraine on February 24, 2022. The extent and duration of the military action, resulting sanctions and resulting future market disruptions in the region are impossible to predict, but could be significant and have a severe adverse effect on the region, including significant negative impacts on the economy and the markets for certain securities and commodities, such as oil and natural gas, as well as other sectors.

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Investment in a Particular Geographic Region or Country Risk — Germany —Investment in German issuers subjects the Fund to legal, regulatory, political, currency, security, and economic risks specific to Germany. Ongoing concerns in relation to the economic health of the EU continue to constrain the economic resilience of certain EU member states, including Germany. Germany has a large export-reliant manufacturing and industrials sector, and

the German economy is dependent to a significant extent on the economies of certain key trading partners, including the Netherlands, China, the United States, the United Kingdom, France, Italy and other European countries. A reduction in spending on German products and services or a decline in any of the economies may have an adverse impact on the German economy. Heavy regulation of labor, energy and product markets in Germany may have an adverse impact on German issuers. Such regulations may negatively impact economic growth or cause prolonged periods of recession. In addition, Russia launched a large-scale invasion of Ukraine on February 24, 2022. The extent and duration of the military action, resulting sanctions and resulting future market disruptions in the region are impossible to predict, but could be significant and have a severe adverse effect on the region, including significant negative impacts on the economy and the markets for certain securities and commodities, such as oil and natural gas, as well as other sectors.

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Investment in a Particular Geographic Region or Country Risk — Netherlands — Investment in Dutch issuers may subject the Fund to regulatory, political, currency, security, and economic risk specific to the Netherlands and the countries that use the euro. Among other things, the Netherlands’ economy is heavily dependent on trading relationships with certain key trading partners, including Germany, Belgium, the U.K., France and Italy. Future changes in the price or the demand for Dutch products or services by these countries or changes in these countries’ economies, trade regulations or currency exchange rates could adversely impact the Dutch economy and the issuers to which the Fund has exposure. The Dutch economy relies on export of financial services to other European countries. European financial markets have from time to time been adversely affected by fiscal crises in other European nations, including Greece, Ireland, Italy, Portugal and Spain. As a result, the Netherlands may have trouble accessing capital markets and may be forced to pay higher interest rates on its debt than if it did not use the euro as its currency. In addition, the Netherlands may be indirectly exposed to the debt of the aforementioned countries through its banking sector. Any default by a country that uses the euro may therefore have a material adverse effect on the Dutch economy. In addition, Russia launched a large-scale invasion of Ukraine on February 24, 2022. The extent and duration of the military action, resulting sanctions and resulting future market disruptions in the region are impossible to predict, but could be significant and have a severe adverse effect on the region, including significant negative impacts on the economy and the markets for certain securities and commodities, such as oil and natural gas, as well as other sectors.

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Market Risk and Selection Risk — Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. The value of a security or other asset may decline due to changes in general market conditions, economic trends or events that are not specifically related to the issuer of the security or other asset, or factors that affect a particular issuer or issuers, exchange, country, group of countries, region, market, industry, group of industries, sector or asset class. Local, regional or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues like pandemics or epidemics, recessions, or other events could have a significant impact on the Fund and its investments. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.

An outbreak of an infectious coronavirus (COVID-19) that was first detected in December 2019 developed into a global pandemic that has resulted in numerous disruptions in the market and has had significant economic impact leaving general concern and uncertainty. Although vaccines have been developed and approved for use by various governments, the duration of the pandemic and its effects cannot be predicted with certainty. The impact of this coronavirus, and other epidemics and pandemics that may arise in the future, could affect the economies of many nations, individual companies and the market in general ways that cannot necessarily be foreseen at the present time.

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Preferred Securities Risk — Preferred securities may pay fixed or adjustable rates of return. Preferred securities are subject to issuer-specific and market risks applicable generally to equity securities. In addition, a company’s preferred securities generally pay dividends only after the company makes required payments to holders of its bonds and other debt. For this reason, the value of preferred securities will usually react more strongly than bonds and other debt to actual or perceived changes in the company’s financial condition or prospects. Preferred securities of smaller companies may be more vulnerable to adverse developments than preferred securities of larger companies.

Performance Information

The information shows you how the Fund’s performance has varied year by year and provides some indication of the risks of investing in the Fund. The Fund’s returns prior to October 23, 2018 shown below are the returns of the Fund when it followed different investment strategies. The table compares the Fund’s performance to that of the MSCI EMU Index. To the extent that dividends and distributions have been paid by the Fund, the performance information for the

Fund in the chart and table assumes reinvestment of the dividends and distributions. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund’s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund’s returns would have been lower. Updated information on the Fund’s performance, including its current net asset value, can be obtained by visiting www.blackrock.com or can be obtained by phone at (800) 882-0052.

Investor A Shares
ANNUAL TOTAL RETURNS
BlackRock EuroFund
As of 12/31

During the ten-year period shown in the bar chart, the highest return for a quarter was 23.46% (quarter ended June 30, 2020) and the lowest return for a quarter was -23.26% (quarter ended March 31, 2020). The year-to-date return as of September 30, 2024 was 15.36%.

For the periods ended 12/31/23 Average Annual Total Returns	1 Year	5 Years	10 Years
BlackRock EuroFund — Investor A Shares
Return Before Taxes	14.05 %	8.99 %	2.26 %
Return After Taxes on Distributions	13.73 %	8.99 %	2.14 %
Return After Taxes on Distributions and Sale of Fund Shares	8.53 %	7.20 %	1.85 %
BlackRock EuroFund — Investor C Shares
Return Before Taxes	18.51 %	9.35 %	2.16 %
BlackRock EuroFund — Institutional Shares
Return Before Taxes	20.69 %	10.41 %	3.03 %
BlackRock EuroFund — Class R Shares
Return Before Taxes	20.01 %	9.73 %	2.35 %
MSCI EMU Index (Reflects no deduction for fees, expenses or taxes)	22.94 %	8.79 %	4.03 %

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor C, Institutional and Class R Shares will vary.

Investment Manager

The Fund’s investment manager is BlackRock Advisors, LLC (previously defined as “BlackRock”). The Fund’s sub-adviser is BlackRock International Limited. Where applicable, the use of the term BlackRock also refers to the Fund’s sub-adviser.

Portfolio Managers

Portfolio Manager	Portfolio Manager of the Fund Since	Title
Andreas Zoellinger, CFA1	2018	Managing Director of BlackRock, Inc.
Tom Joy, CFA	2019	Director of BlackRock, Inc.

1 On or about December 31, 2024, Andreas Zoellinger, CFA will no longer serve as a portfolio manager of the Fund.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of the Fund each day the New York Stock Exchange is open. To purchase or sell shares you should contact your Financial Intermediary, or, if you hold your shares through the Fund, you should contact the Fund by phone at (800) 441-7762, by mail (c/o BlackRock Funds, P.O. Box 534429, Pittsburgh, Pennsylvania 15253-4429), or by the Internet at www.blackrock.com. The Fund’s initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases:

	Investor A and Investor C Shares	Institutional Shares	Class R Shares
Minimum Initial Investment	$1,000 for all accounts except: •$50, if establishing an Automatic Investment Plan. •There is no investment minimum for employer- sponsored retirement plans (not including SEP IRAs, SIMPLE IRAs or SARSEPs). •There is no investment minimum for certain fee- based programs.	There is no minimum initial investment for: •Employer-sponsored retirement plans (not including SEP IRAs, SIMPLE IRAs or SARSEPs), state sponsored 529 college savings plans, collective trust funds, investment companies or other pooled investment vehicles, unaffiliated thrifts and unaffiliated banks and trust companies, each of which may purchase shares of the Fund through a Financial Intermediary that has entered into an agreement with the Fund’s distributor to purchase such shares. •Clients of Financial Intermediaries that: (i) charge such clients a fee for advisory, investment consulting, or similar services or (ii) have entered into an agreement with the Fund’s distributor to offer Institutional Shares through a no- load program or investment platform. •Clients investing through a self-directed IRA brokerage account program sponsored by a retirement plan record- keeper, provided that such program offers only mutual fund options and that the program maintains an account with the Fund on an omnibus basis. $2 million for individuals and “Institutional Investors,” which include, but are not limited to, endowments, foundations, family offices, local, city, and state governmental institutions, corporations and insurance company separate accounts who may purchase shares of the Fund through a Financial Intermediary that has entered into an agreement with the Fund’s distributor to purchase such shares. $1,000 for: •Clients investing through Financial Intermediaries that offer such shares on a platform that charges a transaction	$100 for all accounts.

	Investor A and Investor C Shares	Institutional Shares	Class R Shares
Minimum Initial Investment (continued)		based sales commission outside of the Fund. •Tax-qualified accounts for insurance agents that are registered representatives of an insurance company’s broker-dealer that has entered into an agreement with the Fund’s distributor to offer Institutional Shares, and the family members of such persons.
Minimum Additional Investment	$50 for all accounts (with the exception of certain employer-sponsored retirement plans which may have a lower minimum).	No subsequent minimum.	No subsequent minimum.

Tax Information

The Fund’s dividends and distributions may be subject to U.S. federal income taxes and may be taxed as ordinary income or capital gains, unless you are a tax-exempt investor or are investing through a qualified tax-exempt plan described in section 401(a) of the Internal Revenue Code of 1986, as amended, in which case you may be subject to U.S. federal income tax when distributions are received from such tax-deferred arrangements.

Payments to Broker/Dealers and Other Financial Intermediaries

If you purchase shares of the Fund through a Financial Intermediary, the Fund and BlackRock Investments, LLC, the Fund’s distributor, or its affiliates may pay the Financial Intermediary for the sale of Fund shares and related services.

These payments may create a conflict of interest by influencing the Financial Intermediary and your individual financial professional to recommend the Fund over another investment.

Ask your individual financial professional or visit your Financial Intermediary’s website for more information.

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INVESTMENT COMPANY ACT FILE # 811-4612

SPRO-EF-1024