0001587982 2026-08-20 2026-08-20 0001587982 imstii:S000077098Member 2026-08-20 2026-08-20 0001587982 imstii:S000077098Member imstii:C000237262Member 2026-08-20 2026-08-20 iso4217:USD pure false 497 Investment Managers Series Trust II 2026-08-20 N-1A 0001587982 Arena Strategic Income Fund Class I Shares (Ticker Symbol: ACSIX) A series of Investment Managers Series Trust II Supplement dated August 20, 2026, to the Prospectus and Summary Prospectus, each dated February 28, 2026. Effective immediately, the “Fees and Expenses of the Fund” table beginning on page 1 of the Prospectus and Summary Prospectus is deleted in its entirety and replaced with the following: 2026-02-28 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. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. 20 25 15 0.0065 0 0.0066 0.0002 0.0064 0.0003 0.0134 -0.0036 0.0098 The total annual fund operating expenses and net operating expenses after fees waived and/or expense reimbursements do not correlate to the ratio of expenses to average net assets in the financial highlights, which reflect only the operating expenses of the Fund and do not include acquired fund fees and expenses. February 28, 2037 The total annual fund operating expenses and net operating expenses after fees waived and/or expense reimbursements do not correlate to the ratio of expenses to average net assets in the financial highlights, which reflect only the operating expenses of the Fund and do not include acquired fund fees and expenses. The Fund’s advisor has contractually agreed to waive its fees and/or pay for operating expenses of the Fund to ensure that total annual fund operating expenses (excluding any taxes, leverage interest, brokerage commissions, dividend and interest expenses on short sales, acquired fund fees and expenses (as determined in accordance with SEC Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 0.95% of the average daily net assets of the Class I shares of the Fund. This agreement is in effect through February 28, 2037, and it may be terminated before that date only by the Trust’s Board of Trustees. The Fund’s advisor is permitted to seek reimbursement from the Fund, subject to certain limitations, of fees waived or payments made to the Fund for a period ending three years after the date of the waiver or payment. This reimbursement may be requested from the Fund if the reimbursement will not cause the Fund’s annual expense ratio to exceed the lesser of (a) the expense limitation in effect at the time such fees were waived or payments made, or (b) the expense limitation in effect at the time of the reimbursement.