Summary Prospectus by Investment Company (Form 497K)

Before you invest, you may want to review the Portfolio's prospectus, which contains more information about the Portfolio and its risks. You can find the Portfolio's prospectus and other information about the Portfolio online at www.hardingloevnerfunds.com. You can also get this information at no cost by calling (877) 435-8105 or by sending an e-mail request to [email protected]. If you purchase shares of the Portfolio through a financial intermediary, the prospectus and other information will also be available from your financial intermediary. The current prospectus and statement of additional information, dated February 28, 2026, and as each may be supplemented thereafter, are incorporated by reference into this summary prospectus and may be obtained, free of charge, at the website, phone number or e-mail address noted above.

Investment Objective

The International Small Companies Portfolio (the "Portfolio") seeks long-term capital appreciation through investments in equity securities of small companies based outside the United States.

Portfolio Fees and Expenses

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of Institutional Class Z shares of the Portfolio. 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.

¹Expense information in this table has been restated to reflect current fees. Therefore, the expenses in this table will not correlate to the expenses shown in the Financial Highlights of the Portfolio.

Example:

This example is intended to help you compare the cost of investing in Institutional Class Z of the Portfolio with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in Institutional Class Z of the Portfolio 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 Institutional Class Z's operating expenses remain the same. The example does not take into

account brokerage commissions that you may pay on your purchases and sales of Institutional Class Z shares of the Portfolio. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio Turnover

The Portfolio 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in annual portfolio operating expenses or in the example, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 31% of the average value of its portfolio.

Principal Investment Strategies

The Portfolio invests primarily in small companies based outside the United States, including companies in emerging and frontier as well as in developed markets. Harding Loevner LP ("Harding Loevner"), the Portfolio's investment adviser, undertakes fundamental research in an effort to identify companies that are well managed, financially sound, fast growing, and strongly competitive, and whose shares are reasonably priced relative to estimates of their value.

Companies considered to be small are those having a market capitalization, at time of purchase, within the range of the market capitalization of companies in the Portfolio's benchmark index, currently the MSCI All Country World ex US Small Cap Index (the "Index"). As of December 31, 2025, the range of market capitalization of companies in the Index was US $155.82 million to US $13.07 billion. To reduce its volatility, the Portfolio is diversified across dimensions of geography, industry, and currency. The Portfolio normally holds investments across at least 15 countries.

Factors bearing on whether a company is considered to be "based" outside the United States may include: (1) it is legally domiciled outside the United States; (2) it conducts at least 50% of its business, as measured by the location of its sales, earnings, assets, or production, outside the United States; or (3) it has the principal exchange listing for its securities outside the United States.

The Portfolio will normally invest broadly in equity securities of small companies domiciled in the following countries and regions: (1) Europe; (2) the Pacific Rim; (3) Canada and Mexico; and (4) countries with emerging or frontier markets. At least 65% of the Portfolio's total assets will be denominated in at least three currencies other than the U.S. dollar. For purposes of compliance with this restriction, American Depositary Receipts ("ADRs"), Global Depositary Receipts ("GDRs"), and European Depositary

Receipts ("EDRs") will be considered to be denominated in the currency of the country where the securities underlying the depositary receipts are principally traded.

The Portfolio invests, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in common stocks, preferred stocks, rights, and warrants issued by small companies that are based outside the United States, securities convertible into such securities (including depositary receipts), and investment companies that invest in the types of securities in which the Portfolio would normally invest. If the Portfolio continues to hold securities of small companies whose market capitalization, subsequent to purchase, grows to exceed the upper range of the market capitalization of the Index, it may continue to treat them as small for the purposes of the 80% requirement. The Portfolio also may invest in securities of small U.S. companies that derive, or are expected to derive, a significant portion of their revenues from their foreign operations, although under normal circumstances not more than 15% of the Portfolio's total assets will be invested in securities of U.S. companies.

Because some emerging market countries may present difficulties for efficient foreign investment, the Portfolio may use equity derivative securities to gain exposure to issuers in those countries.

Principal Risks

The Portfolio is subject to numerous risks, any of which could cause an investor to lose money. The principal risks of the Portfolio are as follows:

Market Risk. The value of investments in the Portfolio may fluctuate suddenly and unexpectedly as a result of various market and economic factors, including those affecting individual companies, issuers or particular industries.

Currency Risk. Foreign currencies may experience steady or sudden devaluation relative to the U.S. dollar, adversely affecting the value of the Portfolio's investments. Because the Portfolio's net asset value is determined on the basis of U.S. dollars, if the local currency of a foreign market depreciates against the U.S. dollar, you may lose money even if the foreign market prices of the Portfolio's holdings rise.

Foreign Investment Risk. Securities issued by foreign entities involve risks not associated with U.S. investments. These risks include additional taxation, political, economic, social, geopolitical or diplomatic instability, and the above-mentioned possibility of changes in foreign currency exchange rates. There may also be less publicly-available information about a foreign issuer. Such risks may be magnified with respect to securities of issuers in frontier emerging markets.

Emerging and Frontier Market Risk. Emerging and frontier market securities involve certain risks, such as exposure to economies less diverse and mature than that of the United States or more established foreign markets. Economic or political instability may cause larger price changes in emerging or frontier market securities than in securities of issuers based in more developed foreign countries. The smaller size and lower levels of liquidity in emerging markets, as well as other factors, contribute to greater volatility. Because of this volatility, this Portfolio is better suited for long-term investors.

Small Company Risk. The securities of small companies have historically exhibited more volatility with a lower degree of liquidity than larger companies.

NAV Risk. The net asset value of the Portfolio and the value of your investment will fluctuate.

Portfolio Performance

The following bar chart shows the investment results of the Portfolio's Institutional Class Z shares for the prior year.

The table that follows shows how the average annual returns of the Portfolio's Institutional Class Z shares compare with a broad measure of market performance. Together, these provide an indication of the risks of investing in the Portfolio. How the Institutional Class Z shares of the Portfolio have performed in the past (before and after taxes) is not necessarily an indication of how they will perform in the future. In accordance with new regulatory requirements, the Portfolio has selected the MSCI All Country World ex US Index as the Portfolio's broad-based securities market index. The Portfolio has selected the MSCI All Country World ex US Small Cap Index as a secondary benchmark.

Once available, updated Portfolio performance information will be available at www.hardingloevnerfunds.com or by calling (877) 435-8105.

International Small Companies Portfolio - Institutional Class Z

The best calendar quarter return during the period shown above was 16.61% in the second quarter of 2025; the worst was -10.58% in the fourth quarter of 2024.

¹After-tax returns in the table above 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 an investor's tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Portfolio shares through tax-deferred arrangements, such as 401(k) plans or Individual Retirement Accounts.

Management

Investment Adviser

Harding Loevner serves as investment adviser to the Portfolio.

Portfolio Managers

Jafar Rizvi, Anix Vyas and Samuel Hosseini serve as the portfolio managers of the International Small Companies Portfolio. Mr. Rizvi has held his position since June 2011, Mr. Vyas has held his position since April 2018 and Mr. Hosseini has held his position since September 2024. Messrs. Rizvi and Vyas are co-lead portfolio managers.

Purchase and Sale of Portfolio Shares

Institutional Class Z shares are only available to certain eligible investors and the minimum initial investment is $5 million. Additional purchases may be for any amount. Please see the description of eligible investors under the section called "Shareholder Information." You may purchase, redeem (sell) or exchange shares of the Portfolio on any business day through certain authorized brokers and other financial intermediaries or directly from the Portfolio by mail, telephone, or wire.

Tax Considerations

The Portfolio's distributions are generally taxable to you as ordinary income, capital gains, or a combination of the two, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or an individual retirement account. Upon withdrawal, your investment through a tax-deferred arrangement may become taxable.

Payments to Brokers-Dealers and Other Financial Intermediaries

If you purchase Institutional Class Z shares through a broker-dealer or other financial intermediary (such as a bank), the Portfolio will not pay the intermediary for the sale of Institutional Class Z shares or any other related services. If a related company of the Portfolio does make such payments, such payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Portfolio over another investment. Ask your salesperson or visit your financial intermediary's website for more information.