# EDGAR Filing Document

**Accession Number:** 0000842790
**File Stem:** 0001104659-25-120166
**Filing Date:** 2025-12
**Character Count:** 8231
**Document Hash:** fbf30c30868ab366b52ac866e65bb599
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-120166.hdr.sgml**: 20251211

**ACCESSION NUMBER**: 0001104659-25-120166

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 22

**FILED AS OF DATE**: 20251211

**DATE AS OF CHANGE**: 20251211

**EFFECTIVENESS DATE**: 20251211

**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:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-39519
- **FILM NUMBER:** 251563710

**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 U.S. Government Money Portfolio (Series ID: S000064669)

---

|  |  |
|:---|:---|
| Class Name           | Class ID   |
| Invesco Cash Reserve | C000209395 |
| Class R              | C000209396 |
| Class Y              | C000209397 |
| Class R6             | C000209398 |
| Class C              | C000209399 |

---

## Series and Classes Contracts Data

### Invesco U.S. Government Money Portfolio (Series ID: S000064669)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000209395 | Invesco Cash Reserve |  |
| C000209396 | Class R              |  |
| C000209397 | Class Y              |  |
| C000209398 | Class R6             |  |
| C000209399 | Class C              |  |

?xml version='1.0' encoding='ASCII'? EDGAR HTML

**SUPPLEMENT DATED DECEMBER 11, 2025 TO THE CURRENT SUMMARY AND STATUTORY PROSPECTUSES AND STATEMENT OF ADDITIONAL INFORMATION FOR:** 

**Invesco U.S. Government Money Portfolio**

**(the "Fund")**

This supplement amends the Summary and Statutory Prospectuses and Statement of Additional Information ("SAI") for the above referenced Fund and is in addition to any other supplement(s), unless otherwise specified. *You should read this supplement in conjunction with the Summary and Statutory Prospectuses and SAI and retain it for future reference.*

The following information replaces in its entirety the information appearing under the heading "**Fees and Expenses of the Fund**" in the Prospectuses:

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.** 

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **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:** | **Invesco Cash Reserve** | **C** | **R** | **Y** | **R6** |
| Maximum Sales Charge (Load) Imposed on Purchases (as a <br> percentage of offering price)<br>|  |  |  |  |  |
| Maximum Deferred Sales Charge (Load) (as a percentage of <br> original purchase price or redemption proceeds, whichever is less)<br>| &nbsp;&nbsp; None<sup>1</sup> <br>| &nbsp;&nbsp; 1.00% |  |  |  |

---

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

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Annual Fund Operating Expenses**<br> ***(expenses that you pay each year as a percentage of the value of your investment)*** | **Annual Fund Operating Expenses**<br> ***(expenses that you pay each year as a percentage of the value of your investment)*** | **Annual Fund Operating Expenses**<br> ***(expenses that you pay each year as a percentage of the value of your investment)*** | **Annual Fund Operating Expenses**<br> ***(expenses that you pay each year as a percentage of the value of your investment)*** | **Annual Fund Operating Expenses**<br> ***(expenses that you pay each year as a percentage of the value of your investment)*** | **Annual Fund Operating Expenses**<br> ***(expenses that you pay each year as a percentage of the value of your investment)*** |
| **Class:** | **Invesco Cash Reserve** | **C** | **R** | **Y** | **R6** |
| Management Fees<sup>2</sup> <br>| &nbsp;&nbsp; 0.15% | &nbsp;&nbsp; 0.15% | &nbsp;&nbsp; 0.15% | &nbsp;&nbsp; 0.15% | &nbsp;&nbsp; 0.15% |
| Distribution and/or Service (12b-1) Fees | 0.15 | 1.00 | 0.50 |  |  |
| Other Expenses | 0.30 | 0.30 | 0.30 | 0.30 | 0.11 |
| Total Annual Fund Operating Expenses | 0.60 | 1.45 | 0.95 | 0.45 | 0.26 |

---

<sup>(1)</sup>

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

<sup>(2)</sup>

Management fees have been restated to reflect current fees.

**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 the same.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | 1 Year | 3 Years | 5 Years | 10 Years |
| Invesco Cash Reserve | &nbsp;&nbsp;&nbsp; $61  | &nbsp;&nbsp;&nbsp; $192  | &nbsp;&nbsp;&nbsp; $335  | &nbsp;&nbsp;&nbsp; $750  |
| Class C | &nbsp;&nbsp;&nbsp; $248  | &nbsp;&nbsp;&nbsp; $459  | &nbsp;&nbsp;&nbsp; $792  | &nbsp;&nbsp;&nbsp; $1504  |
| Class R | &nbsp;&nbsp;&nbsp; $97  | &nbsp;&nbsp;&nbsp; $303  | &nbsp;&nbsp;&nbsp; $525  | &nbsp;&nbsp;&nbsp; $1166  |
| Class Y | &nbsp;&nbsp;&nbsp; $46  | &nbsp;&nbsp;&nbsp; $144  | &nbsp;&nbsp;&nbsp; $252  | &nbsp;&nbsp;&nbsp; $567  |
| Class R6 | &nbsp;&nbsp;&nbsp; $27  | &nbsp;&nbsp;&nbsp; $84  | &nbsp;&nbsp;&nbsp; $146  | &nbsp;&nbsp;&nbsp; $331  |

---

O-GMKT-SUMSTATSAI-SUP

------

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

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | 1 Year | 3 Years | 5 Years | 10 Years |
| Invesco Cash Reserve | &nbsp;&nbsp;&nbsp; $61  | &nbsp;&nbsp;&nbsp; $192  | &nbsp;&nbsp;&nbsp; $335  | &nbsp;&nbsp;&nbsp; $750  |
| Class C | &nbsp;&nbsp;&nbsp; $148  | &nbsp;&nbsp;&nbsp; $459  | &nbsp;&nbsp;&nbsp; $792  | &nbsp;&nbsp;&nbsp; $1504  |
| Class R | &nbsp;&nbsp;&nbsp; $97  | &nbsp;&nbsp;&nbsp; $303  | &nbsp;&nbsp;&nbsp; $525  | &nbsp;&nbsp;&nbsp; $1166  |
| Class Y | &nbsp;&nbsp;&nbsp; $46  | &nbsp;&nbsp;&nbsp; $144  | &nbsp;&nbsp;&nbsp; $252  | &nbsp;&nbsp;&nbsp; $567  |
| Class R6 | &nbsp;&nbsp;&nbsp; $27  | &nbsp;&nbsp;&nbsp; $84  | &nbsp;&nbsp;&nbsp; $146  | &nbsp;&nbsp;&nbsp; $331  |

---

The following information replaces the corresponding information for the Fund in the subsection titled "**Investment Adviser**" under the section "**INVESTMENT ADVISORY AND OTHER SERVICES**" in the Fund's SAI:

---

| | |
|:---|:---|
| **Fund** | **Annual Rate/Net Assets Per Advisory** <br> **Agreement**<br>|
| Invesco U.S. Government Money Portfolio | All Assets 0.15% |

---

O-GMKT-SUMSTATSAI-SUP

------