# EDGAR Filing Document

**Accession Number:** 0000842790
**File Stem:** 0001193125-25-149698
**Filing Date:** 2025-6
**Character Count:** 30786
**Document Hash:** 8f71ccd7fd50501f8ca72019e7c045eb
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-149698.hdr.sgml**: 20250627

**ACCESSION NUMBER**: 0001193125-25-149698

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20250627

**DATE AS OF CHANGE**: 20250627

**EFFECTIVENESS DATE**: 20250627

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AIM INVESTMENT SECURITIES FUNDS (INVESCO INVESTMENT SECURITIES FUNDS)
- **CENTRAL INDEX KEY:** 0000842790

**ORGANIZATION NAME:**
- **EIN:** 760343427
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0228

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-39519
- **FILM NUMBER:** 251082148

**BUSINESS ADDRESS:**
- **STREET 1:** 11 GREENWAY PLAZA
- **STREET 2:** SUITE 1000
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77046
- **BUSINESS PHONE:** 7136261919

**MAIL ADDRESS:**
- **STREET 1:** 11 GREENWAY PLAZA
- **STREET 2:** SUITE 1000
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77046

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AIM INVESTMENT SECURITIES FUNDS
- **DATE OF NAME CHANGE:** 20000921

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AIM INVESTMENT SECURITIES FUNDS INC
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AIM PRIME RATE PREMIUM INCOME FUND INC
- **DATE OF NAME CHANGE:** 19910320

## Series and Classes Contracts Data

### INVESCO Short Duration Inflation Protected Fund (Series ID: S000000252)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000000606 | Class A2     | SHTIX           |
| C000000607 | Class A      | LMTAX           |
| C000023119 | CLASS R5     | ALMIX           |
| C000071213 | Class Y      | LMTYX           |
| C000164285 | Class R6     |  |

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| | |
|:---|:---|
| **Summary Prospectus** | **June 27, 2025** |

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**Invesco Short Duration Inflation Protected Fund**

Class: A (LMTAX), A2 (SHTIX), Y (LMTYX), R5 (ALMIX), R6 (SDPSX)

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![](g364266invesco_global.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, reports to shareholders, and other information about the Fund online at www.invesco.com/prospectus. You can also get this information at no cost by calling (800) 959-4246 or by sending an e-mail request to ProspectusRequest@invesco.com. The Fund's prospectus and statement of additional information, both dated June 27, 2025 (as each may be amended or supplemented), 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(s)**

The Fund's investment objective is to provide protection from the negative effects of unanticipated inflation.

**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.

**The table and Examples below do not reflect any transaction fees that may be charged by financial intermediaries or commissions that a shareholder may be required to pay directly to its financial intermediary when buying or selling Class Y or Class R6 shares.** You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in the Invesco Funds. More information about these and other discounts is available from your financial professional and in the section "Shareholder Account Information – Initial Sales Charges (Class A Shares Only)" on page A-3 of the prospectus and the section "Purchase, Redemption and Pricing of Shares-Purchase and Redemption of Shares" on page L-1 of the statement of additional information (SAI).

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Shareholder Fees** (fees paid directly from your investment) | **Shareholder Fees** (fees paid directly from your investment) | **Shareholder Fees** (fees paid directly from your investment) | **Shareholder Fees** (fees paid directly from your investment) | **Shareholder Fees** (fees paid directly from your investment) | **Shareholder Fees** (fees paid directly from your investment) |
| **Class:** | **A** | **A2** | **Y** | **R5** | **R6** |
| Maximum Sales Charge (Load) Imposed on Purchases <br> (as a percentage of offering price)<br>| 2.50<br> %<br>| 1.00<br> %<br>|  |  |  |
| Maximum Deferred Sales Charge (Load) (as a percentage <br> of original purchase price or redemption proceeds, <br> whichever is less)<br>| None<sup>1</sup> <br>|  |  |  |  |

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

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| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the <br> value of your investment)  | **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the <br> value of your investment)  | **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the <br> value of your investment)  | **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the <br> value of your investment)  | **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the <br> value of your investment)  | **Annual Fund Operating Expenses** (expenses that you pay each year as a percentage of the <br> value of your investment)  |
| **Class:**  | **A**  | **A2**  | **Y**  | **R5**  | **R6**  |
| Management Fees  | 0.20<br> % <br>| 0.20<br> % <br>| 0.20<br> % <br>| 0.20<br> % <br>| 0.20<br> % <br>|
| Distribution and/or Service (12b-1) Fees  | 0.25<br>| 0.15<br>|  |  |  |
| Other Expenses  | 0.21<br>| 0.21<br>| 0.21<br>| 0.17<br>| 0.12<br>|
| Total Annual Fund Operating Expenses  | 0.66<br>| 0.56<br>| 0.41<br>| 0.37<br>| 0.32<br>|
| Fee Waiver and/or Expense Reimbursement<sup>2</sup>  | 0.11<br>| 0.11<br>| 0.11<br>| 0.07<br>| 0.02<br>|
| Total Annual Fund Operating Expenses After Fee Waiver <br> and/or Expense Reimbursement <br>| 0.55<br>| 0.45<br>| 0.30<br>| 0.30<br>| 0.30<br>|

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1 A contingent deferred sales charge may apply in some cases. See "Shareholder Account Information-Contingent Deferred Sales Charges (CDSCs)."

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| | |
|:---|:---|
| 2  | Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed to waive advisory fees and/or reimburse expenses to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Class A, Class A2, Class Y, Class R5 and Class R6 shares to 0.55%, 0.45%, 0.30%, 0.30% and 0.30%, respectively, of the Fund's average daily net assets (the "expense limits"). Unless Invesco continues the fee waiver agreement, it will terminate on June 30, 2026. During its term, the fee waiver agreement cannot be terminated or amended to increase the expense limits without approval of the Board of Trustees. |

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**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. This Example does not include commissions and/or other forms of compensation that investors may pay on transactions in Class Y and Class R6 shares. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter.

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  | $305<br>| &nbsp;&nbsp; $445<br>| &nbsp;&nbsp; $598<br>| &nbsp;&nbsp; $1042<br>|
| Class A2  | $46<br>| &nbsp;&nbsp; $168<br>| &nbsp;&nbsp; $302<br>| &nbsp;&nbsp; $691<br>|
| Class Y  | $31<br>| &nbsp;&nbsp; $121<br>| &nbsp;&nbsp; $219<br>| &nbsp;&nbsp; $507<br>|
| Class R5  | $31<br>| &nbsp;&nbsp; $112<br>| &nbsp;&nbsp; $201<br>| &nbsp;&nbsp; $461<br>|
| Class R6  | $31<br>| &nbsp;&nbsp; $101<br>| &nbsp;&nbsp; $178<br>| &nbsp;&nbsp; $404<br>|

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**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 46% of the average value of its portfolio.

**Principal Investment Strategies of the Fund**

The Fund invests under normal circumstances at least 80% of its net assets (plus any borrowings for investment purposes) in the component securities of the ICE BofA 1-5 Year US Inflation-Linked Treasury Index (the Index) and

**1 Invesco Short Duration Inflation Protected Fund**

**invesco.com/us**SDIP-SUMPRO-1

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in derivatives and other instruments that have economic characteristics similar to such securities. The Index is comprised of U.S. Treasury Inflation Protected Securities (TIPS) with at least $1 billion in outstanding face value, at least 18 months to maturity at point of issuance and a remaining term to final maturity of at least 1 year and less than 5 years at the time of index rebalancing. The Fund can also invest the remainder of its assets in fixed income securities that are not included in the Index, but which the Fund's investment adviser, Invesco Advisers, Inc. (Invesco or the Adviser), believes will help the Fund track the Index. The Fund generally expects that its duration, yield and maturity will be substantially similar to those of the Index.

The Fund normally seeks to maintain an average portfolio effective duration that is within +/- 1 year of the duration of the Index, which was 2.01 years as of February 28, 2025.

TIPS are publicly issued, U.S dollar denominated, U.S. government debt securities issued by the U.S. Treasury that have principal and interest payments linked to official inflation (as measured by the Consumer Price Index or CPI) and their payments are supported by the full faith and credit of the United States. As of February 28, 2025, there were 21 TIPS in the Index.

The Fund can invest in derivative instruments, such as swap contracts, options and futures contracts, to seek exposure to certain securities or groups of securities included in the Index.

The Fund may purchase and sell securities on a when-issued, delayed delivery or forward commitment basis, which means that the Fund buys or sells a security with payment and delivery taking place in the future.

The portfolio manager primarily uses a replication strategy to track, as closely as possible, the securities in the Index and their respective weightings, by investing directly in securities that make up the Index. The portfolio manager adjusts the composition of the Fund to reflect changes in the composition of the Index generally at each rebalance of the Index. The Fund may also use a representative sampling methodology to track the performance of the Index. Representative sampling means that the portfolio manager may use a quantitative analysis to select either a subset of the securities that make up the Index or a combination of some or all of the securities that make up the Index and other securities that are not part of the Index. In either case, the representative sampling of securities selected by the portfolio manager should have, in the aggregate, investment characteristics that are similar to the Index in terms of key risk factors, performance attributes and other characteristics, such as market capitalization, duration, maturity, credit quality, yield and coupon, as applicable. It is expected that the portfolio manager will use this representative sampling methodology where it is difficult to acquire the necessary securities that make up the Index, where the asset levels of the Fund do not allow for the holding of all the securities that make up the Index or where it is otherwise beneficial to the Fund to do so.

Unlike many investment companies, the Fund does not utilize an investment strategy that attempts to outperform the Index. Rather, the Fund utilizes an indexing approach, which may eliminate the chance that the Fund will substantially outperform the Index, but it may also reduce some of the risk of active management. Indexing generally achieves lower costs by keeping portfolio turnover low in comparison to actively managed investment companies.

**Principal Risks of Investing in the Fund** 

As with any mutual fund investment, loss of money is a risk of investing. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The risks associated with an investment in the Fund can increase during times of significant market volatility. The principal risks of investing in the Fund are:

***Market Risk***. The market values of the Fund's investments, and therefore the value of the Fund's shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund's investments may go up or down due to general market

conditions that are not specifically related to the particular issuer. These market conditions may include real or perceived adverse economic conditions, changes in trade regulation or economic sanctions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability and uncertainty, natural or environmental disasters, widespread disease or other public health issues, war, military conflict, acts of terrorism, economic crisis or adverse investor sentiment generally, among others. Certain changes in the U.S. economy in particular, such as when the U.S. economy weakens or when its financial markets decline, may have a material adverse effect on global financial markets as a whole, and on the securities to which the Fund has exposure. Increasingly strained relations between the U.S. and foreign countries, including as a result of economic sanctions and tariffs, may also adversely affect U.S. issuers, as well as non-U.S. issuers.

During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

***Index Risk****.* Unlike many investment companies, the Fund does not utilize an investing strategy that seeks returns in excess of its Index. Therefore, the Fund would not necessarily buy or sell a security unless that security is added to or removed from, respectively, the Index, even if that security generally is underperforming. Additionally, the Fund generally rebalances its portfolio in accordance with the Index, and, therefore, any changes to the Index's rebalance schedule will typically result in corresponding changes to the Fund's rebalance schedule.

***Debt Securities Risk****.* The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund's distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer's financial strength, the market's perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The credit analysis applied to the Fund's debt securities may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

***Inflation-Indexed Securities Risk****.* The values of inflation-indexed securities generally fluctuate in response to changes in real interest rates. Such changes may be difficult to predict and it is possible that an investment in inflation-indexed securities will have an effect different from that anticipated. Because of the inflation-adjustment feature, these securities typically have lower yields than traditional fixed-rate securities with similar maturities. Normally inflation-indexed securities will decline in price when real interest rates rise which could cause losses for the Fund. As a result, the Fund's income from its investments in these securities is likely to fluctuate considerably more than the income distributions of its investments in more traditional fixed-income securities.

***Inflation-Indexed Securities Tax Risk****.* Any increase in the principal amount of an inflation-indexed security may be included for tax purposes in the Fund's gross income, even though no cash attributable to such gross income has been received by the Fund. In such event, the Fund may be required to make annual distributions to shareholders that exceed the cash it has otherwise received. In order to pay such distributions, the Fund may be required to raise cash by selling portfolio investments. The sale of such investments could result in capital gains to the Fund and additional capital gain distributions to shareholders. In addition, adjustments during the taxable year for deflation to an inflation-indexed bond held by the Fund may

**2 Invesco Short Duration Inflation Protected Fund**

**invesco.com/us**SDIP-SUMPRO-1

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cause amounts previously distributed to shareholders in the taxable year as income to be characterized as a return of capital.

***Changing Fixed Income Market Conditions Risk****.* Increases in the federal funds and equivalent foreign rates or other changes to monetary policy or regulatory actions may expose fixed income markets to heightened volatility, perhaps suddenly and to a significant degree, and to reduced liquidity for certain fixed income investments, particularly those with longer maturities. Such changes and resulting increased volatility may adversely impact the Fund, including its operations, universe of potential investment options, and return potential. It is difficult to predict the impact of interest rate changes on various markets. In addition, decreases in fixed income dealer market-making capacity may also potentially lead to heightened volatility and reduced liquidity in the fixed income markets. As a result, the value of the Fund's investments and share price may decline. Changes in central bank policies and other governmental actions and political events within the U.S. and abroad may also, among other things, affect investor and consumer expectations and confidence in the financial markets, which could result in higher than normal redemptions by shareholders, which could potentially increase the Fund's portfolio turnover rate and transaction costs.

***U.S. Government Obligations Risk****.* U.S. government securities include securities that are issued or guaranteed by the U.S. Treasury, by various agencies of the U.S. government, or by various instrumentalities which have been established or sponsored by the U.S. government. U.S. Treasury securities are backed by the "full faith and credit" of the United States, which may be negatively affected by an actual or threatened failure of the U.S. government to pay its obligations. Securities issued or guaranteed by federal agencies and U.S. government-sponsored instrumentalities may or may not be backed by the full faith and credit of the United States. In the case of those U.S. government securities not backed by the full faith and credit of the United States, the investor must look principally to the agency or instrumentality issuing or guaranteeing the security for ultimate repayment, and may not be able to assert a claim against the United States itself in the event that the agency or instrumentality does not meet its commitment. The U.S. government, its agencies and instrumentalities do not guarantee the market value of their securities, and consequently, the value of such securities may fluctuate.

***When-Issued, Delayed Delivery and Forward Commitment Risks****.* When-issued and delayed delivery transactions subject the Fund to

market risk because the value or yield of a security at delivery may be more or less than the purchase price or yield generally available when delivery occurs, and counterparty risk because the Fund relies on the buyer or seller, as the case may be, to consummate the transaction. These transactions also have a leveraging effect on the Fund because the Fund commits to purchase securities that it does not have to pay for until a later date, which increases the Fund's overall investment exposure and, as a result, its volatility.

***Non-Correlation Risk****.* The return of the Fund's assets managed pursuant to an indexing approach (Indexed Assets) may not match the return of the index the Fund seeks to track with respect to the Indexed Assets (Underlying Index) for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Underlying Index, and incurs costs in buying and selling securities, especially when rebalancing securities holdings to reflect changes in the Underlying Index. In addition, the performance of the Indexed Assets and the Underlying Index may vary due to asset valuation differences and differences between the Indexed Assets and the Underlying Index resulting from legal restrictions, costs or liquidity constraints.

***Sampling Risk****.* The Fund's use of a representative sampling methodology will result in its holding a smaller number of securities than are in the Index and in the Fund holding securities not included in the Index. As a result, an adverse development respecting an issuer of securities held by the Fund could result in a greater decline in the Fund's NAV than would be the case if all of the securities in the Index were held. The Fund's use of a representative sampling approach may also include the risk that it may not track the return of the Index as well as it would have if the Fund held all of the securities in the Index.

**Performance Information**

The bar chart and performance table provide an indication of the risks of investing in the Fund. The bar chart shows changes in the performance of the Fund from year to year as of December 31. The performance table compares the Fund's performance to that of a style-specific benchmark and a broad-based securities market benchmark (in that order). The Fund's past performance (before and after taxes) is not necessarily an indication of its future performance.

Fund performance reflects any applicable fee waivers and expense reimbursements. Performance returns would be lower without applicable fee waivers and expense reimbursements.

All Fund performance shown assumes the reinvestment of dividends and capital gains and the effect of the Fund's expenses.

Updated performance information is available on the Fund's website at www.invesco.com/us.

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**Annual Total Returns**

The bar chart does not reflect sales loads. If it did, the annual total returns shown would be lower.

![](g364266ltd.jpg)

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| | | |
|:---|:---|:---|
| **Class A2** | **Period Ended** | **Returns** |
| Year-to-date | March 31, 2025 | 3.29% |
| Best Quarter | June 30, 2020 | 2.95% |
| Worst Quarter | September 30, 2022 | -3.28% |

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**3 Invesco Short Duration Inflation Protected Fund**

**invesco.com/us**SDIP-SUMPRO-1

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**Average Annual Total Returns** (for the periods ended December 31, 2024)

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| | | | | |
|:---|:---|:---|:---|:---|
|  | **Inception**<br> **Date**<br>| **1**<br> **Year**<br>| **5**<br> **Years**<br>| **10**<br> **Years**<br>|
| Class A2 |  |  |  |  |
| Return Before Taxes | 12/15/1987 | 2.98<br> %<br>| 2.51<br> %<br>| 1.99<br> %<br>|
| Return After Taxes on Distributions |  | 1.80 | 1.09 | 0.96 |
| &nbsp;&nbsp; Return After Taxes on Distributions and Sale of Fund <br> Shares<br>|  | 1.76 | 1.32 | 1.08 |
| Class A | 10/31/2002 | 1.33 | 2.08 | 1.74 |
| Class Y | 10/3/2008 | 4.19 | 2.87 | 2.24 |
| Class R5 | 7/13/1987 | 4.29 | 2.87 | 2.24 |
| Class R6 | 12/31/2015 | 4.29 | 2.90 | 2.25 <br><sup>1</sup><br>|
| &nbsp;&nbsp; ICE BofA 1-5 Year US Inflation-Linked Treasury <br> Index (reflects no deduction for fees, expenses or <br> taxes)<br>|  | 4.52 | 3.15 | 2.50 |
| &nbsp;&nbsp; Bloomberg U.S. Aggregate Bond Index (reflects no <br> deduction for fees, expenses or taxes)<br>|  | 1.25 | &nbsp;&nbsp; -0.33 | 1.35 |

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Performance shown prior to the inception date is that of the Fund's Class A2 shares at net asset value and includes the 12b-1 fees applicable to that class. Although invested in the same portfolio of securities, Class R6 shares' returns of the Fund will be different from Class A2 shares' returns of the Fund as they have different expenses.

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, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans, 529 college savings plans or individual retirement accounts. After-tax returns are shown for Class A2 shares only and after-tax returns for other classes will vary.

**Management of the Fund**

Investment Adviser: Invesco Advisers, Inc. (Invesco or the Adviser)

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| | | |
|:---|:---|:---|
| **Portfolio Manager** | **Title** | **Length of Service on the Fund** |
| Robert Young, CFA | Portfolio Manager | 2015 |

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**Purchase and Sale of Fund Shares**

You may purchase, redeem or exchange shares of the Fund on any business day through your financial adviser or by telephone at 800-959-4246. Shares of the Fund, other than Class R5 and Class R6 shares, may also be purchased, redeemed or exchanged on any business day through our website at www.invesco.com/us or by mail to Invesco Investment Services, Inc., P.O. Box 219078, Kansas City, MO 64121-9078.

New investments in Class A2 shares are not permitted. The minimum investments for Class A and Y shares for fund accounts are as follows:

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| | | |
|:---|:---|:---|
| **Type of Account** | **Initial** <br> **Investment** <br> **Per Fund**<br>| **Additional**<br> **Investments** <br> **Per Fund**<br>|
| Asset or fee-based accounts managed by your financial adviser |  |  |
| Employer Sponsored Retirement and Benefit Plans and <br> Employer Sponsored IRAs<br>|  |  |
| IRAs and Coverdell ESAs if the new investor is purchasing <br> shares through a systematic purchase plan<br>| $25 | &nbsp;&nbsp; $25 |
| All other types of accounts if the investor is purchasing shares <br> through a systematic purchase plan<br>| 50 | &nbsp;&nbsp; 50 |
| IRAs and Coverdell ESAs | 250 | &nbsp;&nbsp; 25 |
| All other accounts | 1000 | &nbsp;&nbsp; 50 |

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Class R5 shares of the Fund are offered only to grandfathered investors. With respect to Class R5 and Class R6 shares, there is no minimum initial investment for Employer Sponsored Retirement and Benefit Plans investing through a retirement platform that administers at least $2.5 billion in retirement plan assets. All other Employer Sponsored Retirement and Benefit Plans must meet a minimum initial investment of at least $1 million in each Fund in which it invests.

For all other institutional investors purchasing Class R5 or Class R6 shares, the minimum initial investment in each share class is $1 million, unless such investment is made by (i) an investment company, as defined under the Investment Company Act of 1940, as amended (1940 Act), that is

part of a family of investment companies which own in the aggregate at least $100 million in securities, or (ii) an account established with a 529 college savings plan managed by Invesco, in which case there is no minimum initial investment.

There are no minimum investment amounts for Class R6 shares held through retail omnibus accounts maintained by an intermediary, such as a broker, that (i) generally charges an asset-based fee or commission in addition to those described in this prospectus, and (ii) maintains Class R6 shares and makes them available to retail investors.

**Tax Information** 

The Fund's distributions generally are taxable to you as ordinary income, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan, 529 college savings plan or individual retirement account. Any distributions from a 401(k) plan or individual retirement account may be taxed when withdrawn from such plan or account.

**Payments to Broker-Dealers and Other Financial Intermediaries**

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund, the Fund's distributor or 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 intermediary and your salesperson or financial adviser to recommend the Fund over another investment. Ask your salesperson or financial adviser or visit your financial intermediary's website for more information.

**4 Invesco Short Duration Inflation Protected Fund**

**invesco.com/us**SDIP-SUMPRO-1

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