Summary Prospectus by Investment Company - Form 497K

HIGH INCOME FUND

Class	Inst.
Ticker Symbol(s)	PYHIX

Principal Funds, Inc. Summary Prospectus March 1, 2024 as amended October 31, 2024

Before you invest, you may want to review the Fund's Prospectus, which contains more information about the Fund and its risks. You can find the Fund's Prospectus, Statement of Additional Information, Reports to Shareholders, and other information about the Fund online at www.PrincipalAM.com/Prospectuses. You can also get this information at no cost by calling 1-800-222-5852 or by sending an email request to [email protected].

The Fund's Prospectus and Statement of Additional Information, both dated March 1, 2024, as may be amended or supplemented, are incorporated by reference into this Summary Prospectus.

IMPORTANT NOTICE: On October 31, 2024, the Board of Directors of Principal Funds, Inc. approved the acquisition of the assets of the High Income Fund (the "Fund") by the High Yield Fund (the "Proposed Merger"). Additional information about the Proposed Merger will be provided in the Information Statement/Prospectus that is expected to be mailed to record date shareholders of the Fund in February 2025. The record date for the determination of shareholders entitled to receive notice of the Proposed Merger is January 6, 2025, and the Proposed Merger is expected to occur on or about February 28, 2025. The Fund's officers, however, have the discretion to change these dates. In preparation for the Proposed Merger, the Fund may deviate from its stated investment objective and strategies.

On or about February 28, 2025, delete all references to the High Income Fund.

Objective

The Fund seeks high current income.

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 tables and examples below.

If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.

Shareholder Fees (fees paid directly from your investment): None

Annual Fund Operating Expenses

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

Share Class
Inst.
Management Fees	0.61%
Distribution and/or Service (12b-1) Fees	N/A
Other Expenses	0.02%
Total Annual Fund Operating Expenses	0.63%
Fee Waiver (1)	(0.02)%
Total Annual Fund Operating Expenses after Fee Waiver	0.61%

(1) Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to waive a portion of the Fund's management fees through the period ending February 28, 2025. The fee waiver will reduce the Fund's management fees by 0.015% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the fee waiver prior to the end of the period.

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. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year	3 years	5 years	10 years
Institutional Class	$62	$200	$349	$784

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, which are not reflected in 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 35.0% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests primarily in below investment grade bonds and bank loans (sometimes called "high yield" or "junk"), which are rated, at the time of purchase, Ba1 or lower by Moody's Investors Service, Inc. ("Moody's") and BB+ or lower by S&P Global Ratings ("S&P Global"). If the bond or bank loan has been rated by only one of the rating agencies, that rating will determine the rating of the bond or bank loan; if the bond or bank loan is rated differently by the rating agencies, the highest rating will be used; and if the bond or bank loan has not been rated by either of the rating agencies, those selecting such investments will determine the quality of the bond or bank loan. The Fund also invests in investment grade bank loans (also known as senior floating rate interests) and securities of foreign issuers.

In managing the Fund, Principal Global Investors, LLC ("PGI"), the Fund's investment advisor, allocates the Fund's assets among multiple sub-advisors that use differing approaches in making their investment decisions, which include actively managed and more passive investment strategies. With respect to the passive strategy, the Fund uses a sampling methodology to purchase securities with generally the same risk and return characteristics as the Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (the "Index") in an attempt to match or exceed the performance of the Index.

Under normal circumstances, the Fund maintains an average portfolio duration that is within ±25% of the duration of the Index, which as of January 31, 2024 was 3.33 years. The Fund is not managed to a particular maturity.

Principal Risks

The value of your investment in the Fund changes with the value of the Fund's investments. Many factors affect that value, and it is possible to lose money by investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks of investing in the Fund are listed below in alphabetical order and not in order of significance.

Bank Loans Risk. Changes in economic conditions are likely to cause issuers of bank loans (also known as senior floating rate interests) to be unable to meet their obligations. In addition, the value of the collateral securing the loan (if any) may decline, causing a loan to be substantially unsecured. Underlying credit agreements governing the bank loans, reliance on market makers, priority of repayment, and overall market volatility may harm the liquidity of loans.

Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.

Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.

Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).

High Yield Securities Risk. High yield fixed-income securities (commonly referred to as "junk bonds") are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.

Leverage Risk. Leverage created by borrowing or certain types of transactions or investments may impair the fund's liquidity, cause it to liquidate positions at an unfavorable time, increase volatility of the fund's net asset value, or diminish the fund's performance.

Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund's average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.

Redemption and Large Transaction Risk. Ownership of the Fund's shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.

Performance

The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.

The bar chart shows the investment returns of the Fund's Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund's average annual total returns compare with those of one or more broad measures of market performance.

Total Returns as of December 31

Highest return for a quarter during the period of the bar chart above:	Q2 2020	8.47	%
Lowest return for a quarter during the period of the bar chart above:	Q1 2020	(12.72)	%

Average Annual Total Returns For the periods ended December 31, 2023
1 Year	5 Years	10 Years
Institutional Class Return Before Taxes	13.02%	4.48%	3.59%
Institutional Class Return After Taxes on Distributions	9.73%	1.85%	1.05%
Institutional Class Return After Taxes on Distributions and Sale of Fund Shares	7.58%	2.29%	1.60%
Bloomberg U.S. Aggregate Bond Index(reflects no deduction for fees, expenses, or taxes)	5.53%	1.10%	1.81%
Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses, or taxes)	13.44%	5.35%	4.59%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of "broad-based securities market index." The Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index is included as an additional index for the Fund as it shows how the Fund's performance compares with the returns of an index of funds with similar investment objectives.

Investment Advisor and Portfolio Managers

Principal Global Investors, LLC

•James W. Fennessey (since 2007), Portfolio Manager

•Randy L. Welch (since 2007), Portfolio Manager

Sub-Advisors

Insight North America LLC

Polen Capital Credit, LLC

Post Advisory Group, LLC

Purchase and Sale of Fund Shares

For Institutional Class shares, there are no minimum initial or subsequent investment requirements for eligible purchasers.

You may purchase or redeem shares on any business day (normally any day when the New York Stock Exchange is open for regular trading) through your plan, intermediary, or Financial Professional by sending a written request to Principal Funds at P.O. Box 219971, Kansas City, MO 64121-9971 (regular mail) or 430 W. 7th Street, Ste. 219971, Kansas City, MO 64105-1407 (overnight mail); calling us at 1-800-222-5852; or accessing our website (www.principal.com).

Tax Information

The Fund's distributions you receive are generally subject to federal income tax as ordinary income or capital gain and may also be subject to state and local taxes, unless you are tax-exempt or your account is tax-deferred in which case your distributions would be taxed when withdrawn from the tax-deferred account.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase 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, or to recommend one share class of the Fund over another share class. Ask your salesperson or visit your financial intermediary's website for more information.