Summary Prospectus by Investment Company (Form 497K)

Fixed income mutual fund

Nomura Global Bond Fund

(formerly, Macquarie Global Bond Fund)

July 31, 2026

Before you invest, you may want to review the Fund's statutory prospectus (and any supplements thereto), which contains more information about the Fund and its risks. You can find the Fund's statutory prospectus and other information about the Fund, including its statement of additional information and most recent reports to shareholders, online at nomuraassetmanagement.com/literature. You can also get this information at no cost by calling 800 523-1918. The  Fund's statutory prospectus and statement of additional information, both dated July 31, 2026 (and any supplements thereto), are incorporated by reference into this summary prospectus.

What is the Fund's investment objective?

Nomura Global Bond Fund seeks to provide a combination of current income and capital appreciation.

What are the Fund's fees and expenses?

The table below 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 tables and examples below. You may qualify for sales-charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Nomura  Funds (formerly, Macquarie Funds). More information about these and other discounts is available from your financial intermediary, in the Fund's Prospectus under the section entitled "About your account," and in the Fund's statement of additional information (SAI) under the section entitled "Purchasing Shares."

Shareholder fees (fees paid directly from your investment)

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

2

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. In addition, the example shows expenses for Class C shares, assuming those shares were not redeemed at the end of those periods. The example also assumes that your investment has a 5% return each year and reflects the Manager's expense waivers and reimbursements for the 1-year contractual period and the total operating expenses without waivers for years 2 through 10. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Portfolio turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs,

3

Summary prospectus
Nomura Global Bond Fund, a series of Ivy Funds

which are not reflected in the annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 141% of the average value of its portfolio.

What are the Fund's principal investment strategies?

Nomura Global Bond Fund  seeks to achieve its objective by investing, under normal circumstances, at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in a diversified portfolio of bonds of foreign and US issuers (80% policy). For purposes of the 80% policy, "bonds" include various types of debt securities, such as corporate bonds, government bonds, mortgage-backed securities, asset-backed securities, secured and unsecured loan assignments, loan participations and other loan instruments (loans). The Fund may invest in debt securities issued by foreign or US companies of any size, including those in emerging markets, as well as in debt securities issued by foreign or US governments. Under normal circumstances, the Fund invests at least 40% (or, if the Manager deems it warranted by market conditions, at least 30%) of its total assets in securities of non-US issuers, including those located in at least three countries including the United States. Non-US issuers are those that are (1) economically tied to a non-US country or countries, or (2) issued or guaranteed by a company domiciled in, or government of, a non-US country. The Fund may invest up to 100% of its total assets in foreign securities and in securities denominated in currencies other than the US dollar. The Fund may invest in securities of any maturity.

The Fund may invest in both investment and non-investment-grade securities. It may invest up to 35% of its total assets in non-investment-grade bonds, commonly called "high-yield" or "junk" bonds, that include bonds rated BB+ or lower by S&P Global Ratings, a division of S&P Global, Inc. (S&P), or comparably rated by another nationally recognized statistical rating organization (NRSRO) or, if unrated, determined by the Manager to be of comparable quality. The Fund will invest in non-investment-grade securities only if the Manager deems the risks to be consistent with the Fund's objectives.

The Fund may also use a wide range of derivatives instruments, typically including options, futures contracts, options on futures contracts, forwards, and swaps. The Fund will use derivatives for both hedging and nonhedging purposes. For example, the Fund may invest in: futures and options to manage duration and for defensive purposes, such as to protect gains or hedge against potential losses in the portfolio without actually selling a security, or to stay fully invested; forward foreign currency contracts to manage foreign currency exposure; interest rate swaps to neutralize the impact of interest rate changes; credit default swaps to hedge against a credit event, to gain exposure to certain securities or markets, or to enhance total return; and index swaps to enhance return or to effect diversification. The Fund will not use derivatives for reasons inconsistent with its investment objective. Any derivatives that provide exposure to the investment focus suggested by the Fund's name, or to one or more market risk factors associated with the investment focus suggested by the Fund's name, are counted (as applicable) toward compliance with the Fund's 80% policy.

4

Many of the companies in which the Fund may invest have diverse operations, with products or services in foreign markets. Therefore, the Fund may have indirect exposure to various foreign markets through investments in these companies, even if the Fund is not invested directly in such markets.

The Manager may look at a number of factors in selecting securities for the Fund's portfolio including: identifying fundamental global themes; country analysis (economic, legislative/judicial and demographic trends); credit analysis of the issuer (financial strength, cash flow, balance sheet, capital structure, management, strategy and accounting); the maturity, quality, and denomination (US dollar, euro, yen, other) of the issue; domicile, market share and industry of the issuer; and analysis of the issuer's profit history through various economic cycles.

Generally, in determining whether to sell a security, the Manager continues to analyze the factors considered for buying the security. The Manager also considers its assumptions regarding a company, an industry, the markets, an individual economy and/or the global economy. The Manager may sell a security to reduce the Fund's holding in that security, to take advantage of what it believes are more attractive investment opportunities or to raise cash.

The Manager has appointed Nomura Corporate Research and Asset Management Inc. (NCRAM) to serve as a sub-advisor for the Fund. NCRAM is responsible for the day-to-day investment management of the portion of the Fund that invests in high-yield, fixed income securities. The Manager may change this allocation at any time. NCRAM selects investments for its portion of the Fund based on NCRAM's own investment style and strategy.

What are the principal risks of investing in the Fund?

Investing in any mutual fund involves the risk that you may lose part or all of the money you invest. Over time, the value of your investment in the Fund will increase and decrease according to changes in the value of the securities in the Fund's portfolio. An investment in the Fund may not be appropriate for all investors. The Fund's principal risks include:

Credit risk - The risk that an issuer of a debt security, including a governmental issuer or an entity that insures a bond, may be unable to make interest payments and/or repay principal in a timely manner.

Foreign and emerging markets risk - The risk that investments in foreign securities (particularly those of issuers in emerging markets) may be adversely affected by political instability; changes in currency exchange rates; inefficient markets and higher transaction costs; foreign economic conditions; the imposition of economic or trade sanctions; or inadequate or different regulatory and accounting standards. Securities of issuers in emerging markets may be subject to greater risks than securities of issuers in more developed foreign markets because, among other things, emerging markets may have less stable political and economic environments. In addition, there often is substantially less publicly available information about

5

Summary prospectus
Nomura Global Bond Fund, a series of Ivy Funds

issuers and such information tends to be of a lesser quality. Economic markets and structures tend to be less mature and diverse and the securities markets may also be smaller, less liquid, and subject to greater price volatility.

Prepayment risk - The risk that the principal on a bond that is held by a fund will be prepaid prior to maturity at a time when interest rates are lower than what that bond was paying. A fund may then have to reinvest that money at a lower interest rate.

Currency risk - The risk that fluctuations in exchange rates between the US dollar and foreign currencies and between various foreign currencies may cause the value of an investment to decline.

Interest rate risk - The risk that the prices of bonds and other fixed income securities will increase as interest rates fall and decrease as interest rates rise. Interest rate changes are influenced by a number of factors, such as government policy, monetary policy, inflation expectations, and the supply and demand of bonds. Bonds and other fixed income securities with longer maturities or duration generally are more sensitive to interest rate changes. A fund may be subject to a greater risk of rising interest rates when interest rates are low or inflation rates are high or rising.

Liquidity risk - The possibility that investments cannot be readily sold within seven calendar days at approximately the price at which a fund has valued them.

Loans and other  direct indebtedness risk - The risk that a fund will not receive payment of principal, interest, and other amounts due in connection with these investments and will depend primarily on the financial condition of the borrower and the lending institution. A fund's ability to sell its loans or to realize their full value upon sale may also be impaired due to the lack of an active trading market, irregular trading activity, wide bid/ask spreads, contractual restrictions, and extended trade settlement periods. In addition, certain loans in which a fund invests may not be considered securities. A fund therefore may not be able to rely upon the anti-fraud provisions of the federal securities laws with respect to these investments.

High yield (junk) bond risk - The risk that high yield securities, commonly known as "junk bonds," are subject to reduced creditworthiness of issuers, increased risk of default, and a more limited and less liquid secondary market. High yield securities may also be subject to greater price volatility and risk of loss of income and principal than are higher-rated securities.

US government securities risk - The risk that certain US government securities, such as securities issued by Fannie Mae, Freddie Mac and the Federal Home Loan Bank system (FHLB), are not backed by the "faith and credit" of the US government and, instead, may be supported only by the credit of the issuer or by the right of the issuer to borrow from the US Treasury.

Derivatives risk - Derivatives contracts, such as futures, forward foreign currency contracts, options, and swaps, may involve additional expenses (such as the payment of premiums) and are subject to significant loss if a security, index, reference rate, or other asset or market factor

6

to which a derivatives contract is associated, moves in an unanticipated direction. When used for hedging, the change in value of the derivatives instrument may also not correlate specifically with the currency, rate, or other risk being hedged, in which case a fund may not realize the intended benefits. Derivatives contracts are also subject to the risk that the counterparty may fail to perform its obligations under the contract due to, among other reasons, financial difficulties (such as a bankruptcy or reorganization).

Mortgage-backed and asset-backed securities risk - Mortgage-backed and asset-backed securities, like other fixed income securities, are subject to credit risk and interest rate risk, and may also be subject to prepayment risk and extension risk. Prepayment risk is the risk that the principal on mortgage-backed or asset-backed securities may be prepaid at any time, which will reduce the yield and market value of the securities and may cause the fund to reinvest the proceeds in lower yielding securities. Extension risk is the risk that principal on mortgage-backed or asset-backed securities will be repaid more slowly than expected, which may reduce the proceeds available for reinvestment in higher yielding securities. In addition, mortgage-backed and asset-backed securities may decline in value, become more volatile, face difficulties in valuation, or experience reduced liquidity due to changes in interest rates or general economic conditions. Certain mortgage-backed or asset-backed securities, such as  collateralized mortgage obligations, real estate mortgage investment conduits, and stripped mortgage-backed securities, may be more susceptible to these risks than other mortgage-backed, asset-backed, or fixed-income securities.

Capital repatriation risk - The risk that a fund may be unable to repatriate capital from its investments, in whole or in part, which may have an adverse effect on the cash flows and/or performance of the fund. Capital repatriation involves the transfer of corporate money or property from a foreign country back to its home country. The repatriation of capital with regard to investments made in certain securities or countries may be restricted during certain times from the date of such investments or even indefinitely.

Portfolio turnover risk - High portfolio turnover rates may increase a fund's transaction costs and lower returns.

Government and regulatory risk - The risk that governments or regulatory authorities may take actions that could adversely affect various sectors of the securities markets and affect fund performance.

Active management and selection risk - The risk that the securities selected by a fund's management will underperform the markets, the relevant indices, or the securities selected by other funds with similar investment objectives and investment strategies. The securities and sectors selected may vary from the securities and sectors included in the relevant index.

7

Summary prospectus
Nomura Global Bond Fund, a series of Ivy Funds

How has Nomura Global Bond Fund performed?

The bar chart and table below provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year and the table shows how the Fund's average annual total returns for the 1-, 5-, and 10-year periods compare with those of a broad measure of market performance and an additional index with characteristics relevant to the Fund. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The returns reflect any expense caps in effect during these periods. The returns would be lower without the expense caps.

On April 30, 2021,  Delaware Management Company became the Fund's investment manager. The returns shown from before April 30, 2021 are from the Fund's prior investment manager.

Effective November 15, 2021, the Fund changed its investment strategy. Performance prior to November 15, 2021 reflects the Fund's former strategy; its performance may have differed if the Fund's current strategy had been in place.

You may obtain the Fund's most recently available month-end performance by calling 800 523-1918 or by visiting our website at  nomuraassetmanagement.com/performance.

Calendar year-by-year total return (Class A)

As of June 30, 2026, the Fund's Class A shares had a calendar year-to-date return of  1.19%. During the periods illustrated in this bar chart, Class A's highest quarterly return was  9.39% for the quarter ended June 30, 2020, and its lowest quarterly return was -6.60% for the quarter ended March  31, 2020. The maximum Class A sales charge of 4.50%, which is normally deducted when you purchase shares, is not reflected in the highest/lowest quarterly returns or in the bar chart. If this fee were included, the returns would be less than those shown. The average annual total returns in the table below do include the sales charge.

8

Average annual total returns for periods ended December 31, 2025

After-tax performance is presented only for Class A shares of the Fund. The after-tax returns for other Fund classes may vary. Actual after-tax returns depend on the investor's individual tax situation and may differ from the returns shown. After-tax returns are not relevant for shares held in tax-advantaged investment vehicles such as employer-sponsored 401(k) plans and individual retirement accounts (IRAs). The after-tax returns shown are calculated using the highest individual federal marginal income tax rates in effect during the periods presented and do not reflect the impact of state and local taxes.

Who manages the Fund?

Investment manager

Delaware Management Company, a series of Nomura  Investment Management Business Trust (a Delaware statutory trust)

Employees of the Manager's  affiliates outside the US participate in the management of certain funds as "associated persons" of the Manager  under the Manager's oversight, in accordance with SEC guidance as to "participating affiliate" arrangements. These associated persons may, on behalf of the Manager, provide discretionary investment management services, trading, research and related services directly or indirectly to the Fund.

9

Summary prospectus
Nomura Global Bond Fund, a series of Ivy Funds

Sub-advisor

Nomura Corporate Research and Asset Management Inc. (NCRAM)

Purchase and redemption of Fund shares

You may purchase or redeem shares of the Fund on any day that the New York Stock Exchange (NYSE) is open for business (Business Day). Shares may be purchased or redeemed: through your financial intermediary; through the Fund's website at  nomuraassetmanagement.com/account-access; by calling 800 523-1918; by regular mail (c/o  Nomura  Funds, P.O. Box 534437, Pittsburgh, PA 15253-4437); by overnight courier service (c/o Nomura  Funds, Attention: 534437,  1350 Penn Avenue Suite 102, Pittsburgh, PA 15222); or by wire.

For Class A and Class  C shares, the minimum initial investment is generally $1,000 and subsequent investments can be made for as little as $100. The minimum initial investment for IRAs, Uniform Gifts/Transfers to Minors Act accounts, direct deposit purchase plans, and automatic investment plans is $250 and through Coverdell Education Savings Accounts is $500, and subsequent investments in these accounts can be made for as little as $25. For Class R, Institutional Class, Class Y, and Class R6 shares (except those shares purchased through an automatic investment plan), there is no minimum initial purchase requirement, but certain eligibility requirements must be met. The eligibility requirements are described in this Prospectus under "Choosing a share class" and on the Fund's website. We may reduce or waive the minimums or eligibility requirements in certain cases.

Tax information

The Fund's distributions generally are taxable to you as ordinary income, capital gains, or some combination of both, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or an IRA, in which case your distributions may be taxed as ordinary income when withdrawn from the tax-advantaged account.

Payments to broker/dealers and other financial intermediaries

If you purchase shares of the Fund through a broker/dealer or other financial intermediary (such as a bank), the  Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker/dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information.

10

This page intentionally left blank

11

This page intentionally left blank

12

This page intentionally left blank

13

This page intentionally left blank

14

This page intentionally left blank

15

This page intentionally left blank

SMPR-IVSIX 7/26