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Class P2 Prospectus | UBS International Sustainable Equity Fund

UBS International Sustainable Equity Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and current income by investing primarily in the equity securities of non-US issuers.

Fees and expenses

These tables describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. Shares of Class P2 are available for purchase on behalf of clients of a fee-based program or certain other advisory programs in which UBS Asset Management (Americas) Inc., the Fund's investment advisor and administrator ("UBS AM (Americas)" or the "Advisor"), exercises investment discretion. Clients pay a wrap fee or a similar advisory fee to participate in such programs. Shares of Class P2 are also available for purchase on behalf of institutional clients with which the Advisor or its affiliates has signed a separate investment management agreement, pursuant to which such clients pay an advisory fee.

Shareholder fees (fees paid directly from your investment)

Shareholder Fees	Class P2 Prospectus UBS International Sustainable Equity Fund Class P2
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Class P2 Prospectus UBS International Sustainable Equity Fund Class P2
Management fees	0.79%
Distribution and/or service (12b-1) fees	none
Other expenses	0.33%	[1]
Total annual fund operating expenses	1.12%
Less management fee waiver/expense reimbursements	0.87%	[2]
Total annual fund operating expenses after management fee waiver/expense reimbursements	0.25%	[2]

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 sell all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The costs described in the example reflect the expenses of the Fund that would result from the contractual fee waiver and expense reimbursement agreement with the Advisor for the first year only. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example	1 year	3 years	5 years	10 years
Class P2 Prospectus | UBS International Sustainable Equity Fund | Class P2 | USD ($)	26	269	533	1,285

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 Fund 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 53% of the average value of its portfolio.

Principal strategies

Principal investments

Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in equity securities. Investments in equity securities may include, but are not limited to, dividend-paying securities, common stock and preferred stock of issuers located throughout the world and equity securities of real estate investment trusts ("REITs"). Under normal market conditions, the Fund invests primarily (at least 65% of its total assets) in issuers organized or having their principal place of business outside the United States or doing a substantial amount of business outside the United States. Up to 35% of the Fund's assets may be invested in US equity securities. The Fund may invest in issuers from both developed and emerging markets. The Fund's investments may include investments in China A-shares (shares of companies based in mainland China that trade on the Shanghai Stock Exchange and the Shenzhen Stock Exchange). The Fund may also invest in US- or Hong Kong-listed issuers that have entered into contractual relationships with a China-based business and/or individuals/entities affiliated with the business structured as a variable interest entity ("VIE"). In a VIE structure, instead of directly owning the equity interests in a Chinese company, the listed company has contractual arrangements with the Chinese company. These contractual arrangements are expected to provide the listed company (and investors in such company, such as the Fund) with exposure to the China-based company. These arrangements are often used because of Chinese governmental restrictions on non-Chinese ownership of companies in certain industries in China. The Advisor, on behalf of the Fund, intends to diversify broadly among countries, but reserves the right to invest a substantial portion of the Fund's assets in one or more countries if economic and business conditions warrant such investments. The Fund may invest in stocks of companies of any size.

The Fund may, but is not required to, use exchange-traded or over-the-counter ("OTC") derivative instruments for risk management purposes or as part of the Fund's investment strategies. Generally, derivatives are financial contracts whose value depends upon, or is derived from, the value of an underlying asset, reference rate, index or other market factor and may relate to stocks, bonds, interest rates, credit, currencies or currency exchange rates, commodities and related indexes. The derivatives in which the Fund may invest include futures, forward currency agreements and equity partici-

pation notes. All of these derivatives may be used for risk management purposes to manage or adjust the risk profile of the Fund. Futures on currencies and forward currency agreements may also be used to hedge against a specific currency. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments (except for forward currency agreements); or to obtain exposure to certain markets (except for forward currency agreements). The Fund also may use futures contracts on equity securities and indices to gain market exposure on its uninvested cash.

Under certain market conditions, the Fund may invest in companies at the time of their initial public offering ("IPO").

Management process

The Advisor's investment decisions are based upon price/value discrepancies as identified by the Advisor's fundamental valuation process and material sustainability factors across environmental, social and governance ("ESG") criteria.

In constructing the Fund's portfolio, the Advisor employs a positive screening process to identify equity securities of companies that are attractive based on their fundamental valuation profile in addition to evaluating specific sustainability factors. In selecting securities for the Fund, the Advisor focuses on, among other things, identifying discrepancies between a security's fundamental value and its market price. In this context, the fundamental value of a given security is the Advisor's assessment of what a security is worth. The Advisor will select a security whose fundamental value it estimates to be greater than its market value at any given time. For each stock under analysis, the Advisor bases its estimates of value upon country, economic, industry and company analysis, as well as upon a company's management team, competitive advantage and core competencies. The Advisor then compares its assessment of a security's value against the prevailing market prices, with the aim of constructing a portfolio of stocks across industries and countries with attractive relative price/value characteristics. Sustainability factors used by the Advisor in security selection are material factors that help the Advisor evaluate and compare the ESG performance relative to its industry and sector. This information is combined with additional financial analysis and research described above to identify companies the Advisor believes will provide attractively valued and sustainable investment opportunities.

In considering sustainability factors, the Advisor uses ESG tools such as an ESG Material Issues Framework to identify 3 to 5 of the most financially relevant factors, per sector, that can impact the investment thesis across different industry sectors. The universe of

sustainability issues includes environmental factors such as global greenhouse gas emissions and wastewater management; social factors such as customer privacy and product safety; and governance factors such as critical and systemic risk management.

The Advisor also uses a proprietary risk tool to combine scores and data points from a number of reputable external research providers together with the UBS ESG Score to form the UBS ESG Consensus Score. The ESG Consensus Score is a normalized weighted average of ESG Score data from internal and recognized external providers (on a scale of 1-10, with 10 having the best sustainability profile). In addition, absolute ESG risks such as poor corporate governance and high ESG controversy levels are included in the Advisor's risk tool. Collectively, these inputs may lead to an ESG Risk Signal which flags companies with high ESG risks. Once outliers are identified, the Advisor conducts more in-depth analysis to assess the material impact of the ESG risks.

The individual investments in the Fund have a UBS ESG Consensus Score (on a scale of 1-10, with 10 having the best sustainability profile). The Fund's sustainability profile is measured using the weighted average UBS ESG Consensus score. The Fund seeks to maintain a sustainability profile that is higher than its benchmark based on the Advisor's framework. The Fund's sustainability profile is measured by its benchmark profile and the corresponding results are calculated at least once a year. The Fund's sustainability profile calculation does not take account of cash and unrated investment instruments.

In addition, the Advisor excludes from the Fund's portfolio companies or sectors that manufacture products or engage in business activities viewed as having a negative social or environmental impact. Such products or business activities include certain controversial weapons, natural resource extraction activities, thermal coal power generation, and certain controversial behavior and business activities as well as the failure of a portfolio company to meet certain engagement objectives identified by the Advisor. The Advisor may modify the above list of negative screens at any time, without prior shareholder approval or notice.

Main risks

All investments carry a certain amount of risk, and the Fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Below are some of the specific risks of investing in the Fund.

Foreign investing risk: The value of the Fund's investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the

US dollar. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers.

Emerging market risk: There are additional risks inherent in investing in less developed countries that are applicable to the Fund. Compared to the United States and other developed countries, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Further, emerging countries may have economies based on only a few industries and securities markets that trade only a small number of securities and employ settlement procedures different from those used in the United States. Prices on these exchanges tend to be volatile and, in the past, securities in these countries have offered greater potential for gain (as well as loss) than securities of companies located in developed countries. Issuers may not be subject to uniform accounting, auditing and financial reporting standards and there may be less publicly available financial and other information about such issuers, comparable to US issuers. Further, investments by foreign investors are subject to a variety of restrictions in many emerging countries. Countries such as those in which the Fund may invest may experience high rates of inflation, high interest rates, exchange rate fluctuations or currency depreciation, large amounts of external debt, balance of payments and trade difficulties and extreme poverty and unemployment.

China risk: There are special risks associated with investments in China (including Chinese companies listed on US and Hong Kong exchanges), Hong Kong and Taiwan, including exposure to currency fluctuations, less liquidity, expropriation, confiscatory taxation, nationalization and exchange control regulations (including currency blockage). Inflation and rapid fluctuations in inflation and interest rates have had, and may continue to have, negative effects on the economy and securities markets of China, Hong Kong and Taiwan. In addition, investments in Taiwan and Hong Kong could be adversely affected by their respective political and economic relationship with China. China, Hong Kong and Taiwan are deemed by the investment manager to be emerging markets countries, which means an investment in these countries has more heightened risks than general foreign investing due to a lack of established legal, political, business and social frameworks and accounting standards or auditor oversight in these countries to support securities markets as well as the possibility for more widespread corruption and fraud. In addition, the standards for ESG matters in China, Hong Kong and Taiwan tend to be lower than such standards in more developed economies.

Certain securities issued by companies located or operating in China, such as China A-shares, are subject to trading restrictions, quota limitations and less market liquidity. For investments using a VIE structure, all or most of the value of such an investment depends on the enforceability of the contracts between the listed company and the China-based entity (and/or related persons). Investments through a VIE structure are subject to the risk that a counterparty will breach its contracts with the listed company that holds such contractual rights; that any breach of such contracts will likely be subject to Chinese law and jurisdiction; and that Chinese law may be interpreted or change in a way that affects the enforceability of such arrangements, or contracts between the China-based entity (and/or related persons) and the listed company may otherwise not be enforceable under Chinese law. As a result, the market value of the Fund's associated holdings would likely be significantly negatively impacted, which may result in significant losses with little or no recourse available. Further, investments in the listed company may be affected by conflicts of interest and duties between the legal owners of the China-based entity and the stockholders of the listed company, which may adversely impact the value of the investments of the listed company. Additionally, the Chinese economy is highly dependent on the property sector and exportation of products and services, and could experience a significant slowdown or otherwise be adversely impacted due to a slowdown in the housing construction and development markets, a reduction in global demand for Chinese exports, contraction in spending on domestic goods by Chinese consumers, the institution of tariffs or other trade barriers, trade or political disputes with China's major trading partners, natural disasters, or public health threats.

Additionally, emerging market countries, such as China, may subject the Fund's investments to a number of tax rules, and the application of many of those rules may be uncertain. Changes in applicable Chinese tax law could reduce the after-tax profits of the Fund, directly or indirectly, including by reducing the after-tax profits of companies in China in which the Fund invests. Uncertainties in Chinese tax rules could result in unexpected tax liabilities for the Fund.

Sustainability factor risk: Because the Fund uses sustainability factors to assess and exclude certain investments for non-financial reasons, the Fund may forego some market opportunities available to funds that do not use these factors. As a result, the Fund's sustainability factors used in its investment process will likely make the Fund perform differently from a fund that relies solely or primarily on financial metrics, and the Fund's sustainability factors may be linked to long-term rather than short-term returns. The sustainability factors may cause the Fund's industry allocation to deviate from that of funds without these considerations.

Small- and mid-capitalization risk: The risk that securities of smaller capitalization companies tend to be more volatile and less liquid than securities of larger capitalization companies. This can have a disproportionate effect on the market price of smaller capitalization companies and affect the Fund's ability to purchase or sell these securities. In general, smaller capitalization companies are more vulnerable than larger companies to adverse business or economic developments, and they may have more limited resources.

IPOs risk: The purchase of shares issued in IPOs may expose the Fund to the risks associated with issuers that have no operating history as public companies, as well as to the risks associated with the sectors of the market in which the issuer operates. The market for IPO shares may be volatile, and share prices of newly-public companies may fluctuate significantly over a short period of time.

Geographic concentration risk: The risk that if the Fund has most of its investments in a single country or region, its portfolio will be more susceptible to factors adversely affecting issuers located in that country or region than would a more geographically diverse portfolio of securities.

Market risk: The market value of the Fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole.

Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives used for investment (non-hedging) purposes, may cause the Fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the Fund that exceed the amount originally invested.

Derivatives risk: The value of "derivatives"—so called because their value "derives" from the value of an underlying asset, reference rate or index—may rise or fall more rapidly than other investments. It is possible for the Fund to lose more than the amount it invested in the derivative. The risks of investing in derivative instruments also include market risk, management risk, counterparty risk (which is the risk that a counterparty to a derivative contract is unable or unwilling to meet its financial obligations) and the risk that changes in the value of a derivative may not correlate perfectly with the underlying asset, rate, index or overall market securities. In addition, non-exchange traded derivatives may be subject to liquidity risk, credit risk and mispricing or valuation complexity. These derivatives risks are different from, and may be greater than, the risks associated with investing directly in securities and other instruments.

Real estate securities and REITs risk: The risk that the Fund's performance will be affected by adverse developments in the real estate industry. Real estate values may be affected by a variety of factors, including: local, national or global economic conditions; changes in zoning or other property-related laws; environmental regulations; interest rates; tax and insurance considerations; overbuilding; property taxes and operating expenses; or declining values in a neighborhood. Similarly, a REIT's performance depends on the types, values, locations and management of the properties it owns. In addition, a REIT may be more susceptible to adverse developments affecting a single project or market segment than a more diversified investment. Loss of status as a qualified REIT under the US federal tax laws could adversely affect the value of a particular REIT or the market for REITs as a whole.

Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.

Performance

Risk/return bar chart and table

The performance information that follows shows the Fund's Class P2 performance information in a bar chart and an average annual total returns table. The information provides some indication of the risks of investing in the Fund by showing the Fund's performance for 2021 and by showing how the Fund's average annual total returns compare with those of a broad measure of market performance. The MSCI ACWI ex-US Index reflects no deduction for fees, expenses or taxes but is net of dividend tax withholding. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance for the Fund is available at www.ubs.com/us-mutualfundperformance.

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 an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class P shares' after-tax returns shown.

Total return (Class P2)*

* 2021 is the Fund's Class P2 shares' first full year of operations

Total return January 1 - September 30, 2022: (26.26)%
Best quarter during calendar year shown—2Q 2021: 4.40%
Worst quarter during calendar year shown—3Q 2021: (1.83)%

Average annual total returns (for the periods ended December 31, 2021)

Average Annual Returns - Class P2 Prospectus - UBS International Sustainable Equity Fund	Average Annual Returns, 1 Year	Average Annual Returns, Since Inception	Average Annual Returns, Inception Date
Class P2	4.14%	20.34%	Oct. 30, 2020
After Taxes on Distributions | Class P2	1.76%	17.75%
After Taxes on Distributions and Sale of Fund Shares | Class P2	4.22%	15.62%
MSCI ACWI ex-US Index	7.82%	24.27%

[1] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.

[2] The Trust, with respect to the Fund, and the Advisor have entered into a written agreement pursuant to which the Advisor has agreed to waive its management fees and retained administration fees, and to reimburse expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions, dividend expense and security loan fees for securities sold short, and extraordinary expenses, such as proxy-related expenses) to the extent necessary so that the Fund's ordinary operating expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions, dividend expense and security loan fees for securities sold short, and extraordinary expenses, such as proxy-related expenses) through the period ending October 28, 2023 do not exceed 0.25%. Pursuant to the expense limitation agreement, the Advisor is entitled to be reimbursed for any expenses it reimburses to the extent such reimbursement can be made during the three years following the period during which such expense reimbursements were made, provided that the reimbursement of the Advisor by the Fund will not cause the Fund to exceed the lesser of any applicable expense limit that is in place for the Fund (i) at the time of the reimbursement or (ii) at the time of the recoupment. The expense limitation agreement may be terminated by the Fund's Board of Trustees at any time and also will terminate automatically upon the expiration or termination of the Fund's advisory contract with the Advisor. Upon termination of the expense limitation agreement, however, the Advisor's three year recoupment rights will survive.