Prospectus by Investment Company (Form 497)

Main International ETF

a Series of Northern Lights Fund Trust IV

Supplement dated December 29, 2025 to the Prospectus, Summary Prospectus and Statement of Additional Information (the “SAI”) dated February 28, 2025, as supplemented

* * * * * * *

Effective January 1, 2026, the Fund’s adviser, Main Management ETF Advisors, LLC, (the “Adviser”) has contractually agreed to pay a portion of the Fund’s acquired fund fees and expenses necessary to limit the Fund’s current operating expenses plus acquired fund fees and expenses, until at least February 28, 2027, to no more than 0.91% of the Fund’s average daily net assets.

The fee table and expense example on page 11 of the Prospectus and pages 1 and 2 of the Summary Prospectus will be amended and restated as shown below.

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example reflects the fee waiver and expense reimbursements for the duration of the waiver/reimbursement period only.

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. 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 upon these assumptions your costs would be:

The following disclosure replaces the fourth and fifth paragraphs under the heading MANAGEMENT on page 25 of the Prospectus.

The Adviser has contractually agreed to reduce its fees and/or absorb expenses of Thematic Innovation, until at least February 28, 2031 to ensure that total annual fund operating expenses after fee waiver and/or reimbursement excluding (i) any front-end or contingent deferred loads; (ii) brokerage fees and commissions; (iii) acquired fund fees and expenses; (iv) fees and expenses associated with investments in other collective investment vehicles not registered under the 1940 Act or derivative instruments (including for example option and swap fees and expenses); (v) borrowing costs (such as interest and dividend expense on securities sold short); (vi) taxes; and (vii) extraordinary expenses, such as litigation expenses (which may include indemnification of Fund officers and Trustees, contractual indemnification of Fund service providers (other than the Adviser)) will not exceed 0.99% of the average daily net assets for Thematic Innovation; subject to possible recoupment from the relevant Fund in future years on a rolling three-year basis (within the three years after the fees have been waived or reimbursed) if such recoupment can be achieved within the lesser of the expense limitations or those in place at the time of waiver and the expense limitation in place at the time of recapture.

The Adviser has contractually agreed to reduce its fees and/or absorb expenses of Sector Rotation until February 28, 2031 and International until at least February 28, 2027, to ensure that total annual fund operating expenses after fee waiver and/or reimbursement excluding (i) any front-end or contingent deferred loads; (ii) brokerage fees and commissions; (iii) fees and expenses associated with investments in other collective investment vehicles not registered under the 1940 Act, as amended, or derivative instruments (including for example option and swap fees and expenses); (iv) borrowing costs (such as interest and dividend expense on securities sold short); (v) taxes; and (vi) extraordinary expenses, such as litigation expenses (which may include indemnification of Fund officers and Trustees, contractual indemnification of Fund service providers (other than the Adviser)) will not exceed 0.65% of the average daily net assets for Sector Rotation and 0.74% of the average daily net assets for International; subject to possible recoupment from the Fund in future years on a rolling three-year basis (within the three years after the fees have been waived or reimbursed) if such recoupment can be achieved within the lesser of the expense limitation or those in place at the time of waiver and the expense limitation in place at the time of recapture. Further, the Adviser agrees to pay that portion of Sector Rotation’s and International’s acquired fund fees and expenses necessary to limit Sector Rotation’s current operating expenses plus acquired fund fees and expenses to no more than 0.74% of Sector Rotation’s average daily net assets and no more than 0.91% of International’s average daily net assets.

The following disclosure replaces the seventh and eighth paragraphs under the heading INVESTMENT ADVISER on pages 29 and 30 of the SAI.

The Adviser has contractually agreed to reduce its fees and/or absorb expenses of Thematic Innovation, until at least February 28, 2031 to ensure that total annual fund operating expenses after fee waiver and/or reimbursement excluding (i) any front-end or contingent deferred loads; (ii) brokerage fees and commissions; (iii) acquired fund fees and expenses; (iv) fees and expenses associated with investments in other collective investment vehicles not registered under the 1940 Act or derivative instruments (including for example option and swap fees and expenses); (v) borrowing costs (such as interest and dividend expense on securities sold short); (vi) taxes; and (vii) extraordinary expenses, such as litigation expenses (which may include indemnification of Fund officers and Trustees, contractual indemnification of Fund service providers (other than the Adviser)) will not exceed 0.99% of the average daily net assets for Thematic Innovation; subject to possible recoupment from the relevant Fund in future years on a rolling three-year basis (within the three years after the fees have been waived or reimbursed) if such recoupment can be achieved within the lesser of the expense limitations or those in place at the time of waiver and the expense limitation in place at the time of recapture.

The Adviser has contractually agreed to reduce its fees and/or absorb expenses of Sector Rotation until February 28, 2031 and International until at least February 28, 2027, to ensure that total annual fund operating expenses after fee waiver and/or reimbursement excluding (i) any front-end or contingent deferred loads; (ii) brokerage fees and commissions; (iii) fees and expenses associated with investments in other collective investment vehicles not registered under the 1940 Act, as amended, or derivative instruments (including for example option and swap fees and expenses); (iv) borrowing costs (such as interest and dividend expense on securities sold short); (v) taxes; and (vi) extraordinary expenses, such as litigation expenses (which may include indemnification of Fund officers and Trustees, contractual indemnification of Fund service providers (other than the Adviser)) will not exceed 0.65% of the average daily net assets for Sector Rotation and 0.74% of the average daily net assets for International; subject to possible recoupment from the Fund in future years on a rolling three-year basis (within the three years after the fees have been waived or reimbursed) if such recoupment can be achieved within the lesser of the expense limitation or those in place at the time of waiver and the expense limitation in place at the time of recapture. Further, the Adviser agrees to pay that portion of Sector Rotation’s and International’s acquired fund fees and expenses necessary to limit Sector Rotation’s current operating expenses plus acquired fund fees and expenses to no more than 0.74% of Sector Rotation’s average daily net assets and no more than 0.91% of International’s average daily net assets.

* * * * * * *

You should read this Supplement in conjunction with the Fund’s Summary Prospectus, Prospectus and SAI dated February 28, 2025, as supplemented, which provide information that you should know about the Fund before investing. The Fund’s Summary Prospectus, Prospectus and SAIhave each been filed with the Securities and Exchange Commission and are incorporated by reference. Copies these documents may be obtained without charge by visiting www.mainmgtetfs.comor by calling 1-866-383-9778.