# EDGAR Filing Document

**Accession Number:** 0001413594
**File Stem:** 0001104659-26-024800
**Filing Date:** 2026-3
**Character Count:** 32537
**Document Hash:** fd497dc500d2da48321b7b4ba2b789a1
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-024800.hdr.sgml**: 20260306

**ACCESSION NUMBER**: 0001104659-26-024800

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260306

**DATE AS OF CHANGE**: 20260306

**EFFECTIVENESS DATE**: 20260306

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** abrdn Funds
- **CENTRAL INDEX KEY:** 0001413594

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-146680
- **FILM NUMBER:** 26732424

**BUSINESS ADDRESS:**
- **STREET 1:** 1900 MARKET STREET
- **STREET 2:** SUITE 200
- **CITY:** PHILADELPHIA
- **STATE:** PA
- **ZIP:** 19103
- **BUSINESS PHONE:** 215-405-5700

**MAIL ADDRESS:**
- **STREET 1:** 1900 MARKET STREET
- **STREET 2:** SUITE 200
- **CITY:** PHILADELPHIA
- **STATE:** PA
- **ZIP:** 19103

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Aberdeen Funds
- **DATE OF NAME CHANGE:** 20070926

## Series and Classes Contracts Data

### abrdn Ultra Short Municipal Income Fund (Series ID: S000061523)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000199221 | Class A             | ATOAX           |
| C000199222 | Institutional Class | ATOIX           |
| C000210496 | Class A1            | ATOBX           |

**abrdn Funds: Summary Prospectus**

**abrdn Ultra Short Municipal Income Fund**

February 28, 2026 (as amended and restated on March 6, 2026)

![](j2682323_ba001.jpg)

**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, Statement of Additional Information, shareholder reports and other information about the Fund online at https://www.aberdeeninvestments.com/us/literature. You can also get this information at no cost by e-mailing a request to Investor.Services.US@aberdeenplc.com, calling (866) 667-9231 or asking your financial advisor. The Fund's Prospectus and Statement of Additional Information, both dated February 28, 2026, as may be supplemented, and the independent registered public accounting firm's report and financial statements in the Fund's Form N-CSR, dated October 31, 2025, are incorporated by reference into this summary prospectus.**

**Fund Tickers**

Class A - ATOAX ■ Class A1 - ATOBX ■ Institutional Class - ATOIX

**Objective**

The abrdn Ultra Short Municipal Income Fund (the "Ultra Short Municipal Income Fund" or the "Fund") seeks high after-tax current income consistent with preservation of capital.

**Fees and Expenses of the Fund**

This table describes the fees and expenses that you may pay when you buy, hold and sell shares of the Ultra Short Municipal Income Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $250,000 in abrdn Funds. More information about these and other discounts is available from your financial advisor and in the "Reduction and Waiver of Class A and Class A1 Sales Charges" and "Broker-Defined Sales Charge Waiver Policies" sections on pages 112 and 152 of the Fund's prospectus, respectively, and in the "Additional Information on Purchases and Sales - Waiver of Class A and Class A1 Sales Charges" and "Reduction of Sales Charges" sections on pages 104 and 105 of the Fund's Statement of Additional Information, respectively. **You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below.**

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| | | | |
|:---|:---|:---|:---|
| **Shareholder Fees (fees paid directly from your investment)** | **Class A Shares** | **Class A1 Shares** | **Institutional**<br> **Class Shares** |
| Maximum Sales Charge (Load) imposed upon purchases <br>(as a percentage of offering price) |  | 0.50% |  |
| Maximum Deferred Sales Charge (Load) (as a percentage of offering <br>or sale price, whichever is less) |  | 0.25%<sup>(1)</sup> |  |
| Small Account Fee<sup>(2)</sup> | $20 | $20 | $20 |
| **Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)** |  |  |  |
| Management Fees<sup>(3)</sup> | 0.30% | 0.30% | 0.30% |
| Distribution and/or Service (12b-1) Fees | 0.25% | 0.25% |  |
| Other Expenses | 0.29% | 0.19% | 0.27% |
| Total Annual Fund Operating Expenses | 0.84% | 0.74% | 0.57% |
| Less: Amount of Fee Limitations/Expense Reimbursements<sup>(4)</sup> | 0.14% | 0.04% | 0.12% |
| Total Annual Fund Operating Expenses After Fee Limitations/Expense <br>Reimbursements | 0.70% | 0.70% | 0.45% |

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<sup>(1)</sup> Unless you are otherwise eligible to purchase Class A1 shares without a sales charge, a contingent deferred sales charge (CDSC) of up to 0.25% will be charged on Class A1 shares redeemed within 12 months of purchase if you paid no sales charge on the original purchase and a finder's fee was paid.

<sup>(2)</sup> Accounts with balances below $1,000 are generally subject to a $5 quarterly fee (with an annual maximum of $20 per account). Shares from such accounts are redeemed each quarter to cover the fee, which is returned to the Fund to offset small account expenses.

<sup>(3)</sup> Management fees have been restated to reflect current fees as a result of a reduction in the Fund's contractual management fee rate effective October 17, 2025.

<sup>(4)</sup> abrdn Funds (the "Trust") and abrdn Inc. (the "Adviser") have entered into a written contract limiting operating expenses to 0.70% for Class A shares, 0.70% for Class A1 shares and 0.45% for Institutional Class shares. This contractual limitation may not be terminated without the approval of the Independent Trustees before February 28, 2027. This limit includes Rule 12b-1 Fees, but excludes certain expenses, including any interest, brokerage commissions, expenses incurred indirectly by the Fund as a result of investments in other investment companies and pooled investment vehicles ("acquired fund fees and expenses" or "AFFE") (but includes AFFE for affiliated investment vehicles managed by the Adviser), and extraordinary expenses. The Trust is authorized to reimburse the Adviser for management fees previously limited and/or for expenses previously paid by the Adviser, provided, however, that any reimbursements must be paid at a date not more than three years after the date when the Adviser limited the fees or reimbursed the expenses and the reimbursements do not cause a Class to exceed the lesser of the applicable expense limitation in the contract at the time the fees were limited or expenses are paid or the applicable expense limitation in effect at the time the expenses are being recouped by the Adviser.

Fund Summary - abrdn Ultra Short Municipal Income Fund<br>1

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Fund Summary - abrdn Ultra Short Municipal Income Fund

**Example**

This Example is intended to help you compare the cost of investing in the Ultra Short Municipal Income 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. It assumes a 5% return each year and that the Fund's operating expenses remain the same (taking into account the contractual limitation until its expiration). Although your actual costs may be higher or lower, based on these assumptions your costs would be:

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| | | | | |
|:---|:---|:---|:---|:---|
| | **1 Year** | **3 Years** | **5 Years** | **10 Years** |
| Class A Shares | $72 | $254 | $452 | $1024 |
| Class A1 Shares | $121 | $281 | $455 | $960 |
| Institutional Class Shares | $46 | $171 | $306 | $702 |

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**Portfolio Turnover**

The Ultra Short Municipal Income 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 154% of the average value of its portfolio.

**Principal Strategies**

The Ultra Short Municipal Income Fund invests its assets in a combination of tax-exempt obligations and taxable debt obligations. As a fundamental policy, under normal circumstances the Fund invests at least 80% of its net assets in tax-exempt obligations. Net assets include the amounts of any borrowings for investment purposes. Tax-exempt obligations include municipal obligations that pay interest that is free from U.S. federal income tax (but may be subject to the federal alternative minimum tax ("AMT")).

In managing the Fund's investments, the Adviser seeks to capitalize on fundamental and technical opportunities in the debt obligations markets to enhance return. The obligations in which the Fund invests may be of any maturity.

Under normal market conditions, the Fund will generally maintain an investment portfolio with a weighted average effective duration of less than one year. The Adviser expects to increase or decrease the portfolio's effective duration based on its outlook for the market and interest rates. Duration measures the sensitivity of bond prices to changes in interest rates (for example, if interest rates were to rise 1%, a bond or bond fund with a duration of one year would be expected to lose approximately 1% of its value). The longer the duration of a bond, the longer it will take to repay the principal and interest obligations and the more sensitive it will be to changes in interest rates. Because of events affecting the bond markets and interest rate changes, the duration of the portfolio may not meet the target at all times.

The obligations in which the Fund invests must, at the time of investment, be rated investment grade, as determined by the various rating agencies, or if unrated, of comparable quality as determined by the Adviser. In the event that a security receives different ratings from different nationally recognized statistical rating organizations ("NRSROs"), the Adviser will treat the security as being rated in the highest rating category received from an NRSRO. In determining suitability of investment in a particular unrated security, the Adviser takes into consideration asset and debt service coverage, the purpose of the financing, history of the issuer, existence of other rated securities of the issuer, and other relevant conditions, such as comparability to other issuers. If an obligation's credit rating is downgraded after the Fund's investment, the Adviser monitors the situation to decide if the Fund needs to take any action such as selling the obligation.

The Fund may invest in municipal obligation-related underlying funds (such as exchange-traded funds) specific types of municipal obligations, including auction rate securities and tender option bonds. The Fund may invest in a combination of underlying funds that currently exist or that may become available for investment in the future for which abrdn Inc. or an affiliate now or in the future acts as investment adviser or principal underwriter without considering or canvassing the universe of unaffiliated funds available. Tender option bonds are created when a holder deposits tax-exempt or other bonds into a special purpose trust ("TOB trust"). The TOB trust issues two types of securities: floating rate notes ("floaters" or "TOBs") and a residual security junior to the floaters ("inverse floaters"). The Fund does not currently intend to deposit bonds into a TOB trust or invest in inverse floaters, but may invest in floaters issued by TOB trusts.

The Fund may invest in municipal obligations of any state, city, county or other governmental entity, including Puerto Rico and U.S. territories. The Fund currently anticipates that it will have significant exposure to Texas municipal securities.

In managing the Fund, the Adviser employs a process that combines sector allocation, fundamental research and duration management. In determining sector allocation, the Adviser analyzes the prevailing financial and investment characteristics of a broad range of sectors in which the Fund may invest and seeks to enhance performance and manage risk by underweighting or overweighting particular sectors. Based on fundamental research regarding

Fund Summary - abrdn Ultra Short Municipal Income Fund<br>2

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Fund Summary - abrdn Ultra Short Municipal Income Fund

securities, including fixed income research, credit analyses and use of sophisticated analytical systems, the Adviser makes decision to purchase and sell securities for the Fund. The Adviser examines the material risks of an investment across a spectrum of considerations including financial metrics, regional and national conditions and industry specific factors. The Adviser may also consider the most material potential ESG (Environmental, Social and Governance) risks and opportunities impacting issuers, where relevant. Not every ESG factor may be identified or evaluated for every investment. ESG characteristics are not the only factors considered and, as a result, the issuers in which the Fund invests may not be issuers with favorable ESG characteristics or high ESG ratings. As ESG information is just one investment consideration, ESG considerations generally are not solely determinative in any investment decision made by the Adviser. The relevance of ESG factors to the investment process varies across issuers and instrument types. The Adviser also considers economic factors to develop strategic forecasts as to the direction of interest rates which are then used to establish the Fund's target duration, a common measurement of a security's sensitivity to interest rate movements. For obligations owned by the Fund, duration measures the average time needed to receive the present value of all principal and interest payments by analyzing cash flows and interest rate movements. The Adviser closely monitors the Fund's portfolio and makes adjustments as necessary.

The Fund's investment strategies may result in a portfolio turnover rate in excess of 100% on an annual basis.

**Principal Risks**

The Ultra Short Municipal Income Fund cannot guarantee that it will achieve its investment objective.

As with any fund, the value of the Fund's investments – and therefore, the value of Fund shares – may fluctuate. The following is a list of the principal risks of investing in the Fund (in alphabetical order after the first five risks).

**Market Risk –** Deteriorating market conditions might cause a general weakness in the market that reduces the prices, or yield, of securities in those markets in which the Fund invests.

**Fixed Income Securities Risk –** Fixed income securities fluctuate in price based on changes in an issuer's financial condition and overall market and economic conditions. The value of a fixed income security may also fall due to specific conditions that affect a particular sector of the securities market or a particular issuer. Fixed income securities are subject to, among other risks, credit risk, extension risk, issuer risk, interest rate risk, market risk and prepayment risk.

**Active Management Risk –** The Fund is subject to the risk that the Adviser may make poor security selections. The Adviser and its portfolio managers apply their own investment techniques and risk analyses in making investment decisions for the Fund and there can be no guarantee that these decisions will achieve the desired results for the Fund. In addition, the Adviser may select securities that underperform the relevant market or other funds with similar investment objectives and strategies.

**Municipal Securities Risk –** Municipal bonds can be significantly affected by political and economic changes, including inflation, as well as uncertainties in the municipal market related to taxation, legislative changes, or the rights of municipal security holders. Municipal bonds have varying levels of sensitivity to changes in interest rates. Interest rate risk is generally lower for shorter-term Municipal bonds and higher for long term Municipal bonds.

*Municipal Bond Tax Risk*. A municipal bond that is issued as tax-exempt may later be declared to be taxable. In addition, if the federal income tax rate is reduced, the value of the tax exemption may be less valuable, causing the value of a municipal bond to decline.

*Municipal Market Volatility and Illiquidity Risk*. The municipal bond market can be susceptible to unusual volatility, particularly for lower-rated and unrated securities. Liquidity can be reduced unpredictably in response to overall economic conditions or credit tightening. During times of reduced market liquidity, the Fund may not be able to readily sell bonds without the sale significantly changing the market value of the bond. If the Fund needed to sell large blocks of bonds to meet shareholder redemption requests or to raise cash, those sales could further reduce the bonds' prices.

*Municipal Sector Risk*. From time to time the Fund may invest a substantial amount of its assets in municipal securities whose interest is paid solely from revenues of similar projects. If the Fund concentrates its investments in this manner, it assumes the economic risks relating to such projects and this may have a significant impact on the Fund's investment performance.

*State-Specific Risk*. A Fund may from time to time invest a substantial amount of its total assets in municipal securities of issuers in one or more states and, therefore, is subject to the risk that the economies of the states in which it invests, and the revenues supporting the municipal securities, may decline. Investing a substantial amount of its total assets in one or more states means that a Fund is more susceptible to the economic, market, political, regulatory or other occurrences that affect the issuers in those states. The particular states in which a Fund may focus its investments may change over time and the Fund may alter its focus at inopportune times.

*Texas State-Specific Risk*. To the extent the Fund invests a substantial amount of its assets in Texas municipal securities, the Fund may be affected by economic, regulatory or political developments affecting the ability of Texas issuers to pay interest or repay principal.

Fund Summary - abrdn Ultra Short Municipal Income Fund<br>3

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Fund Summary - abrdn Ultra Short Municipal Income Fund

**Yield Risk –** The amount of income received by the Fund will go up or down depending on day-to-day variations in short-term interest rates, and when interest rates are very low the Fund's expenses could absorb all or a significant portion of the Fund's income. If interest rates increase, the Fund's yield may not increase proportionately. For example, the Adviser may discontinue any temporary voluntary fee limitation or recoup amounts previously waived and/or reimbursed.

**Auction Rate Securities Risk –** Auction rate securities are variable rate bonds whose interest rates are reset at specified intervals through a "Dutch" auction process. A "Dutch" auction is a competitive bidding process designed to determine a single uniform clearing rate that enables purchases and sales of the auction rate securities to take place at par. All accepted bids and holders of the auction rate securities receive the same rate. Auction rate securities holders rely on the liquidity generated by the auction. There is a risk that an auction will fail due to insufficient demand for the securities. If an auction fails, an auction rate security may become illiquid until a subsequent successful auction is conducted, the issuer redeems the issue, or a secondary market develops.

**Cybersecurity Risk –** Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, customer data (including private shareholder information), or proprietary information, or cause the Fund, the Adviser and/or its service providers (including, but not limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or lose operational functionality.

**ESG Integration Risk –** To the extent ESG factors are used to evaluate investments, the consideration of such factors may adversely affect the Fund's performance. Not every ESG factor may be identified or evaluated for every investment. ESG characteristics are not the only factors considered and, as a result, the issuers in which the Fund invests may not be issuers with favorable ESG characteristics or high ESG ratings. The application of ESG factors may result in the Fund performing differently than its benchmark index and other funds in its peer group that do not consider ESG factors or consider different ESG factors.

**Interest Rate Risk –** The Fund's fixed income investments are subject to interest rate risk, which generally causes the value of a fixed income portfolio to decrease when interest rates rise resulting in a decrease in the Fund's net assets. Interest rate fluctuations tend to have a greater impact on fixed income-securities with a greater time to maturity and/or lower coupon. A fund with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio duration. In periods of market volatility, the market values of fixed income securities may be more sensitive to changes in interest rates.

**Investment-Grade Debt Securities –** Investment-grade debt securities are debt securities rated within the highest grades (AAA/Aaa through BBB-/Baa) by S&P or Moody's rating services, and unrated securities of comparable quality. If a Fund invests, at the time of purchase, in a security that is investment-grade, it is possible that such security may be downgraded after its purchase so that it is no longer investment-grade.

**Portfolio Turnover Risk –** The Fund may engage in active and frequent trading of portfolio securities to achieve its investment objective. High portfolio turnover may result in greater transaction costs which may reduce Fund performance. The sale of Fund portfolio securities may also result in greater realization and/or distribution to shareholders of gains or losses as compared to a fund with less active trading, which may include short-term gains taxable at ordinary income tax rates.

**Tender Option Bonds Risk –** Tender option bonds are synthetic floating-rate or variable-rate securities issued when long-term bonds are purchased in the primary or secondary market and then deposited into a trust. Tender option bonds may be considered derivatives, and may expose the Fund to the same risks as investments in derivatives, as well as risks associated with leverage, especially the risk of increased volatility.

**Underlying Fund Risk –** The risk that the Fund's performance is closely related to the risks associated with the securities and other investments held by the underlying funds in which it invests and that the ability of the Fund to achieve its investment objective will depend upon the ability of such underlying funds to achieve their investment objectives. Investments in exchange-traded funds are also subject to market risk, tracking error, the potential for trading at a discount or premium to their net asset value, bid/ask spread risk as well as the risks of the underlying securities they hold.

**Valuation Risk –** The price that the Fund could receive upon the sale of any particular portfolio investment may differ from the Fund's valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair valuation methodology or a price provided by an independent pricing service. As a result, the price received upon the sale of an investment may be less than the value ascribed by the Fund, and the Fund could realize a greater than expected loss or lesser than expected gain upon the sale of the investment. The Fund's ability to value its investments may also be impacted by technological issues and/or errors by pricing services or other third-party service providers.

**Variable and Floating Rate Securities Risk –** For floating and variable rate obligations, there may be a lag between an actual change in the underlying interest rate benchmark and the reset time for an interest payment of such an obligation, which could harm or benefit the Fund, depending on the interest rate environment or other circumstances. Variable rate demand obligations ("VRDOs") are floating rate securities that combine an interest in a long term municipal

Fund Summary - abrdn Ultra Short Municipal Income Fund<br>4

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Fund Summary - abrdn Ultra Short Municipal Income Fund

bond with a right to demand payment before maturity from a bank or other financial institution. If the bank or financial institution is unable to pay, the Fund may lose money.

If the value of the Fund's investments decreases, you may lose money.

For additional information regarding the above identified risks, see "Fund Details: Additional Information about Investments, Investment Techniques and Risks" in the prospectus.

**Performance**

The bar chart and table below can help you evaluate potential risks of the Ultra Short Municipal Income Fund. The bar chart shows how the Fund's annual total returns for Institutional Class shares have varied from year to year. The table following the bar chart compares the Fund's performance over time with those of a broad measure of market performance and an additional index that more closely reflects the Fund's investment strategy. Returns in the table reflect the maximum applicable sales charges, if any. The table compares the Fund's performance over time with those of the Bloomberg Municipal Bond Index, a broad-based securities index, and the Bloomberg Barclays Municipal Bond: 1 Year (1-2) Index. Remember, however, that past performance (before and after taxes) is not necessarily indicative of how the Fund will perform in the future. For updated performance information, please visit https://www.aberdeeninvestments.com/en-us/investor/funds/view-all-funds or call 866-667-9231.

The returns presented for the Fund for periods prior to May 7, 2018 reflect the performance of a predecessor fund (the "Predecessor Fund"), which was a registered investment company. The Fund adopted the performance of the Predecessor Fund as the result of a reorganization that occurred as of the close of business on May 4, 2018, in which the Fund acquired all of the assets, subject to the liabilities, of the Predecessor Fund. The Fund and the Predecessor Fund have substantially similar investment objectives and strategies.

Returns of the Predecessor Fund have not been adjusted to reflect the expenses applicable to the respective classes of the Fund.

abrdn Inc. began advising the Fund immediately following the closing of the reorganization. Performance prior to this date reflects the performance of an unaffiliated investment adviser.

Class A1 returns prior to the commencement of operations of Class A1 (inception date: February 28, 2019) are based on the previous performance of the Fund's Class A shares (inception date 3/30/2004). Excluding the effect of any fee waivers or reimbursements, this performance is substantially similar to what each individual class would have produced because all classes invest in the same portfolio of securities. Returns would only differ to the extent of the differences in expenses between the two classes.

**Annual Total Returns – Institutional Class Shares**

**(Years Ended Dec. 31)**

![](j2682323_ba002.jpg)

Highest Return: 1.12% - 4th quarter 2023

Lowest Return: -0.17% - 1st quarter 2022

After-tax returns are shown in the following table for Institutional Class shares only and will vary for other classes. After-tax returns are calculated using the historical highest individual federal marginal income tax rates in effect and do not reflect the impact of state and local taxes. Your actual after-tax return depends on your personal tax situation and may differ from what is shown here. After-tax returns are not relevant to investors in tax-deferred arrangements, such as individual retirement accounts, 401(k) plans or certain other employer-sponsored retirement plans.

Fund Summary - abrdn Ultra Short Municipal Income Fund<br>5

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Fund Summary - abrdn Ultra Short Municipal Income Fund

**Average Annual Total Returns as of December 31, 2025**

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| | | | |
|:---|:---|:---|:---|
| | **1 Year** | **5 Years** | **10 Years** |
| Class A shares - Before Taxes | 2.79% | 2.14% | 1.48% |
| Class A1 shares - Before Taxes | 2.28% | 2.04% | 1.43% |
| Institutional Class shares - Before Taxes | 3.05% | 2.34% | 1.71% |
| Institutional Class shares - After Taxes on Distributions | 3.05% | 2.34% | 1.71% |
| Institutional Class shares - After Taxes on Distributions and Sales of Shares | 3.05% | 2.34% | 1.71% |
| Bloomberg Municipal Bond Index<sup>(1)</sup> (reflects no deduction for fees, expenses or taxes) | 4.25% | 0.80% | 2.34% |
| Bloomberg Barclays Municipal Bond: 1 Year (1-2) Index<sup>(2)</sup> (reflects no deductions for fees, <br>expenses or taxes) | 3.47% | 1.73% | 1.58% |

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<sup>(1)</sup> The Bloomberg Municipal Bond Index is an unmanaged index considered representative of the tax-exempt bond market.

<sup>(2)</sup> The Bloomberg Barclays Municipal Bond: 1 Year (1-2) Index is an unmanaged index that includes bonds with a minimum credit rating of BAA3, are issued as part of a deal of at least $50 million, have an amount outstanding of at least $5 million, and have maturities of 1 to 2 years. Indexes are unmanaged and have been provided for comparison purposes only. No fees or expenses are reflected.

**Investment Adviser**

abrdn Inc. (the "Adviser") serves as the Ultra Short Municipal Income Fund's investment adviser.

**Portfolio Managers**

The Fund is managed using a team-based approach, with the following team members being jointly and primarily responsible for the day-to-day management of the Fund:

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| | | | | |
|:---|:---|:---|:---|:---|
| **Name** | **Title** | **Served on the Fund Since** | **Served on the Fund Since** | **Served on the Fund Since** |
| Miguel Laranjeiro | Investment Director |  | 2016 | \* |
| Jonathan Mondillo | Global Head of Fixed Income |  | 2015 | \* |

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<sup>\*</sup>Includes service with unaffiliated investment adviser to Predecessor Fund

**Purchase and Sale of Fund Shares**

The Fund's minimum investment requirements are as follows:

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| | |
|:---|:---|
| **CLASS A and CLASS A1 SHARES** | **CLASS A and CLASS A1 SHARES** |
| To open an account | $1000 |
| To open an IRA account | $1000 |
| Additional investments | $50 |
| To start an Automatic Investment Plan | $1000 |
| Additional Investments (Automatic Investment Plan) | $50 |
| **INSTITUTIONAL CLASS SHARES** | **INSTITUTIONAL CLASS SHARES** |
| To open an account | $1000000 |
| Additional investments | No Minimum |

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The Fund reserves the right to apply or waive investment minimums under certain circumstances as described in the prospectus under the "Choosing a Share Class" section.

Fund shares may be redeemed on each day that the New York Stock Exchange is open. Fund shares may be sold by mail or fax, by telephone or on-line.

**Tax Information**

The Fund intends to distribute dividends exempt from regular federal income tax and capital gains distributions; although, a portion of the Fund's distributions may be subject to federal income tax or alternative minimum tax.

**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), the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other financial intermediary and your financial advisor to recommend the Fund over another investment. Ask your financial advisor or visit your financial intermediary's website for more information.

Fund Summary - abrdn Ultra Short Municipal Income Fund<br>6

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