VK-SLO-PRO SUP-1

Prospectus Supplement dated October 25, 2019

Invesco Senior Loan Fund

The purpose of this supplement is to provide you with changes to the current Prospectus for Class A, C, Y, IB and IC shares of Invesco Senior Loan Fund.

This supplement amends the Statutory Prospectus of the above referenced fund (the “Fund”) and is in addition to any other supplement(s), unless otherwise specified. You should read this supplement in conjunction with the Statutory Prospectus and retain it for future reference.

The following information replaces in its entirety the first paragraph appearing under the heading “Purchase of Shares – General” in the prospectus for the Fund:

“This Prospectus offers three classes of Shares of the Fund, designated as Class A Shares, Class C Shares and Class Y Shares, and describes two classes of Shares, designated as Class IB Shares and Class IC Shares, which are not continuously offered. Class A Shares and Class C Shares are available to all retail investors, including individuals, trusts, corporations, business and charitable organizations and retirement and benefits plans. Class Y shares are available to (i) investors who purchase through an account that is charged an asset-based fee or commission by a financial intermediary including through brokerage platforms, where a broker is acting as the investor’s agent, that may require the payment by the investor of a commission and/or other form of compensation to that broker, that Invesco or its affiliate has approved to sell Class Y shares, (ii) defined contribution plans, defined benefit retirement plans, endowments or foundations, (iii) banks or bank trust departments acting on their own behalf or as trustee or manager for trust accounts, or (iv) any current, former or retired trustee, director, officer or employee (or immediate family members of a current, former or retired trustee, director, officer or employee) of any registered investment funds offered to retail investors advised by the Adviser (“Invesco Funds”) or of Invesco Ltd. or any of its subsidiaries. By offering multiple classes of Shares, the Fund permits each investor to choose the class of Shares that is most beneficial given the type of investor, the amount to be invested and the length of time the investor expects to hold the Shares. You should discuss with your authorized dealer which Share class is most appropriate for you. As described more fully below, each class of Shares offers a distinct structure of sales charges, distribution and service fees and other features (for example, the reduced or eliminated sales charges available for purchases of Class A Shares over $100,000 of the Fund or your cumulative ownership of Participating Funds) that are designed to address a variety of needs.”

VK-SLO-PRO SUP-1