# EDGAR Filing Document

**Accession Number:** 0001112996
**File Stem:** 0001104659-25-116426
**Filing Date:** 2025-11
**Character Count:** 9591
**Document Hash:** c26c61a668d08c4e8822970e9021ad7d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-116426.hdr.sgml**: 20251126

**ACCESSION NUMBER**: 0001104659-25-116426

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 19

**FILED AS OF DATE**: 20251126

**DATE AS OF CHANGE**: 20251126

**EFFECTIVENESS DATE**: 20251126

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AIM COUNSELOR SERIES TRUST (INVESCO COUNSELOR SERIES TRUST)
- **CENTRAL INDEX KEY:** 0001112996

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0831

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-36074
- **FILM NUMBER:** 251530122

**BUSINESS ADDRESS:**
- **STREET 1:** 11 GREENWAY PLAZA
- **STREET 2:** SUITE 1000
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77046
- **BUSINESS PHONE:** 713-626-1919

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AIM COUNSELOR SERIES TRUST
- **DATE OF NAME CHANGE:** 20040322

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AIM COUNSELOR SERIES FUNDS
- **DATE OF NAME CHANGE:** 20031126

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AIM COUNSELOR SERIES FUNDS INC
- **DATE OF NAME CHANGE:** 20031001

## Series and Classes Contracts Data

### INVESCO S&P 500 INDEX FUND (Series ID: S000027821)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| CLASS A    | SPIAX         | C000084420 |
| CLASS C    | SPICX         | C000084422 |
| CLASS Y    | SPIDX         | C000084423 |
| Class R6   | nan           | C000188891 |
| Class R    | SPIRX         | C000265797 |

---

## Series and Classes Contracts Data

### INVESCO S&P 500 INDEX FUND (Series ID: S000027821)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000084420 | CLASS A      | SPIAX           |
| C000084422 | CLASS C      | SPICX           |
| C000084423 | CLASS Y      | SPIDX           |
| C000188891 | Class R6     |  |
| C000265797 | Class R      | SPIRX           |

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

**SUPPLEMENT DATED NOVEMBER 26, 2025 TO THE CURRENT SUMMARY AND STATUTORY PROSPECTUSES AND STATEMENT OF ADDITIONAL INFORMATION FOR:**

**Invesco S&P 500 Index Fund** 

(the "Fund")

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

The following information is added under the heading "**Principal Investment Strategies of the Fund**" and "**Investment Objective(s), Strategies, Risks and Portfolio Holdings – Objective(s) and Strategies**" in the prospectuses, as applicable:

The Fund intends to be diversified in approximately the same proportion as the Underlying Index is diversified. The Fund may become "non-diversified," as defined in the Investment Company Act of 1940 (1940 Act) solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the Underlying Index. As a "non-diversified" fund, the Fund can invest a greater percentage of its assets in a small group of issuers or in any one issuer than a diversified fund can. **Shareholder approval will not be sought when the Fund crosses from diversified to non-diversified status solely due to a change in the relative market capitalization or index weighting of one or more constituents of the Underlying Index.** As of November 20, 2025, the Underlying Index is non-diversified, and therefore as of that same date, the Fund is managed as non-diversified solely in accordance with the Underlying Index.

The following information is added under the heading "**Principal Risks of Investing in the Fund**" in the Summary Prospectus:

***Non-Diversification Risk*.** To the extent the Fund becomes non-diversified, the Fund may invest a greater portion of its assets in the obligations or securities of a small number of issuers or any single issuer than a diversified fund can. A change in the value of one or a few issuers' securities will therefore affect the value of the Fund more than if it was a diversified fund. This may increase the Fund's volatility and cause the performance of a relatively small number of issuers to have a greater impact on the Fund's performance.

The following information is added under the heading "**Investment Objective(s), Strategies, Risks and Portfolio Holdings – Risks**" in the Statutory Prospectus:

***Non-Diversification Risk*.** To the extent the Fund becomes non-diversified, the Fund may invest a greater portion of its assets in the obligations or securities of a small number of issuers or any single issuer than a diversified fund can. Because a large percentage of the Fund's assets may be invested in a limited number of issuers, a change in the value of one or a few issuers' securities will affect the value of the Fund more than would occur in a diversified fund. This may increase the Fund's volatility and cause the performance of a relatively small number of issuers to have a greater impact on the Fund's performance.

The following information replaces the second paragraph appearing under the heading "**DESCRIPTION OF THE FUNDS AND THEIR INVESTMENTS AND RISKS – Classification**" in the SAI:

Invesco NASDAQ 100 Index Fund and Invesco S&P 500 Index Fund intend to be diversified in approximately the same proportion as their respective target indices are diversified. However, the Funds may be "non-diversified," as defined in the 1940 Act, solely as a result of a change in relative market capitalization or index weighting of one or more constituents of their respective target indices. A non-diversified fund can invest a greater percentage of its assets in a small number of issuers or any one issuer than a diversified fund can.

The following information replaces item (1) appearing under the heading "**DESCRIPTION OF THE FUNDS AND THEIR INVESTMENTS AND RISKS – Fund Policies – Fundamental Restrictions**" in the SAI:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) The Fund (except for Invesco American Franchise Fund and Invesco Discovery Large Cap Fund) is a "diversified company" as defined in the 1940 Act. The Fund will not purchase the securities of any issuer if, as a result, the Fund would fail to be a diversified company within the meaning of the 1940 Act, and the rules and regulations promulgated thereunder, as such statute, rules and regulations are amended from time to time or are interpreted from time to time by the SEC staff (collectively, the 1940 Act Laws and Interpretations) or except to the extent that the Fund may be permitted to do so by exemptive order or similar relief (collectively, with the 1940 Act Laws and Interpretations, the 1940 Act Laws, Interpretations, and Exemptions), and with respect to each of Invesco NASDAQ 100 Index Fund and Invesco S&P 500 Index Fund, including as may be necessary to approximate the composition of its underlying index. In complying with this restriction, however, the Fund may purchase securities of other investment companies to the extent permitted by the 1940 Act Laws, Interpretations and Exemptions.

MS-SPI-SUMSTATSAI-SUP 112625

------

The following information replaces the third paragraph appearing under the heading "**DESCRIPTION OF THE FUNDS AND THEIR INVESTMENTS AND RISKS – Fund Policies – Explanatory Note**" in the SAI:

For purposes of the fundamental restriction related to diversification above of Invesco NASDAQ 100 Index Fund and Invesco S&P 500 Index Fund, these two Funds intend to be diversified in approximately the same proportion as their respective target indices are diversified. These two Funds may become "non-diversified," as defined in the 1940 Act, solely as a result of a change in relative market capitalization or index weighting of one or more constituents of their respective target indices. **Shareholder approval will not be sought if these two Funds become non-diversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of their respective target indices.**

The following information replaces the first paragraph of item (1) appearing under the heading "**DESCRIPTION OF THE FUNDS AND THEIR INVESTMENTS AND RISKS – Fund Policies – Non-Fundamental Restrictions**" in the SAI:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) In complying with the fundamental restriction regarding issuer diversification, the Fund (except for Invesco American Franchise Fund and Invesco Discovery Large Cap Fund) will not, and Invesco NASDAQ 100 Index Fund and Invesco S&P 500 Index Fund generally will not, unless permitted by the fundamental restriction, with respect to 75% of its total assets, purchase the securities of any issuer (other than securities issued or guaranteed by the U.S. government or any of its agencies or instrumentalities and securities issued by other investment companies), if, as a result, (i) more than 5% of the Fund's total assets would be invested in the securities of that issuer, or (ii) the Fund would hold more than 10% of the outstanding voting securities of that issuer. The Fund may purchase securities of other investment companies as permitted by the 1940 Act Laws, Interpretations and Exemptions.

MS-SPI-SUMSTATSAI-SUP 112625

------