Summary Prospectus by Investment Company - Form 497K

CORE FIXED INCOME FUND

Class	A	J	Inst.	R-1	R-3	R-4	R-5	R-6
Ticker Symbol(s)	CMPIX	PIOJX	PIOIX	PIOMX	PIOOX	PIOPX	PIOQX	PICNX

Principal Funds, Inc. Summary Prospectus March 1, 2024 as amended March 18, 2024 and October 15, 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.

SHARE CLASS CONVERSION NOTICE: On March 13, 2024, the Fund's Board of Directors approved the conversion of the Fund's Class R-1 shares into Class R-3 shares and the Class R-4 shares into Class R-5 shares. Following the close of business on November 22, 2024, Class R-1 shares of the Fund will automatically convert into Class R-3 shares of the Fund, and Class R-4 shares of the Fund will automatically convert into Class R-5 shares of the Fund on the basis of the share classes' relative net asset values on such date. The conversion will not result in the imposition of any charges. As a result of the conversion, the impacted shareholders will be in a better position with respect to expenses, as expenses are lower for Class R-3 than for the current Class R-1 shares, and are lower for the Class R-5 shares than for the current R-4 shares. The Fund expects these share class conversions will not constitute taxable sales or exchanges to shareholders. Effective as of the close of the New York Stock Exchange on September 1, 2024, Class R-4 shares will no longer be available for purchase from new retirement plans, except in limited circumstances.

On or about November 22, 2024, delete references to Class R-1 and Class R-4 shares of these Funds, including information regarding the conversion plan, from the Prospectus.

Objective

The Fund seeks to provide a high level of current income consistent with preservation of capital.

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. 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 Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in "Choosing a Share Class and The Costs of Investing" beginning on page 426 of the Fund's Prospectus, Appendix B to the Prospectus titled "Intermediary-Specific Sales Charge Waivers and Reductions," and "Multiple Class Structure" beginning on page 70 of the Fund's Statement of Additional Information.

If you purchase Institutional Class or Class R-6 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.

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Shareholder Fees (fees paid directly from your investment)

Share Class
A	J	Inst.	R-1	R-3	R-4	R-5	R-6
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	2.25%	None	None	None	None	None	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the offering price or NAV when Sales Load is paid, whichever is less)	1.00%	1.00%	None	None	None	None	None	None

Annual Fund Operating Expenses

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

Share Class
A	J	Inst.	R-1	R-3	R-4	R-5	R-6
Management Fees (1)	0.33%	0.33%	0.33%	0.33%	0.33%	0.33%	0.33%	0.33%
Distribution and/or Service (12b-1) Fees	0.25%	0.15%	N/A	0.35%	0.25%	0.10%	N/A	N/A
Other Expenses	0.17%	0.15%	0.15%	0.54%	0.33%	0.29%	0.27%	0.01%
Acquired Fund Fees and Expenses	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	0.76%	0.64%	0.49%	1.23%	0.92%	0.73%	0.61%	0.35%
Expense Reimbursement (2)	N/A	N/A	(0.05)%	N/A	N/A	N/A	N/A	N/A
Total Annual Fund Operating Expenses after Expense Reimbursement	0.76%	0.64%	0.44%	1.23%	0.92%	0.73%	0.61%	0.35%

(1) Fees have been restated to reflect current fees.

(2) Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund's expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.43% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.

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
Class A	$301	$462	$638	$1,146
Class J	165	205	357	798
Institutional Class	45	152	269	611
Class R-1	125	390	676	1,489
Class R-3	94	293	509	1,131
Class R-4	75	233	406	906
Class R-5	62	195	340	762
Class R-6	36	113	197	443

With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):

1 year	3 years	5 years	10 years
Class J	$65	$205	$357	$798

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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 9.9% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in fixed-income securities. The Fund invests primarily in a diversified pool of investment-grade fixed-income securities, including corporate securities, U.S. government securities, asset-backed securities and mortgage-backed securities (securitized products) (including collateralized mortgage obligations), and foreign securities. Investment grade securities are rated BBB- or higher by S&P Global Ratings ("S&P Global") or Baa3 or higher by Moody's Investors Service, Inc. ("Moody's"), at the time of purchase. If the security has been rated by only one of the rating agencies, that rating will determine the security's rating; if the security is rated differently by the rating agencies, the highest rating is used; and if the security has not been rated by either of the rating agencies, those selecting such investments will determine the security's quality. The Fund is not managed to a particular maturity. Under normal circumstances, the Fund maintains an average portfolio duration that is within ±25% of the duration of the Bloomberg U.S. Aggregate Bond Index, which as of January 31, 2024 was 6.11 years.

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.

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).

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.

Real Estate Securities Risk. Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.

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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.

Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).

U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.

U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.

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 Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. 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.

For periods prior to the inception date of Class R-6 shares (November 25, 2014), the performance shown in the table for Class R-6 shares is that of the Fund's Class A shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class A shares, the historical performance of the Class A shares is used (without respect to sales charges, which are not applicable to Class R-6 shares). These adjustments result in performance for such periods that is no higher than the historical performance of the Class A shares.

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Total Returns as of December 31

Highest return for a quarter during the period of the bar chart above:	Q4 2023	6.75	%
Lowest return for a quarter during the period of the bar chart above:	Q1 2022	(5.80)	%

Average Annual Total Returns For the periods ended December 31, 2023
1 Year	5 Years	10 Years
Class A Return Before Taxes	3.09%	0.57%	1.52%
Class A Return After Taxes on Distributions	1.87%	(0.42)%	0.35%
Class A Return After Taxes on Distributions and Sale of Fund Shares	1.81%	0.04%	0.66%
Class J Return Before Taxes	4.56%	1.16%	1.86%
Institutional Class Return Before Taxes	5.87%	1.33%	2.08%
Class R-1 Return Before Taxes	4.91%	0.53%	1.26%
Class R-3 Return Before Taxes	5.35%	0.86%	1.57%
Class R-4 Return Before Taxes	5.55%	1.05%	1.77%
Class R-5 Return Before Taxes	5.57%	1.15%	1.88%
Class R-6 Return Before Taxes	5.84%	1.41%	2.10%
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)	5.53%	1.10%	1.81%

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. After-tax returns are shown for Class A shares only and would be different for the other share classes.

Investment Advisor and Portfolio Managers

Principal Global Investors, LLC

•Jeff Callahan (since 2025), Portfolio Manager (add on March 31, 2025)

•Bryan C. Davis (since 2025), Portfolio Manager (add on March 31, 2025)

•John R. Friedl (since 2005), Portfolio Manager

•Michael Goosay (since 2023), Portfolio Manager

•Scott J. Peterson (since 2010), Portfolio Manager (remove on March 31, 2025)

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Purchase and Sale of Fund Shares

Share Class	Investment Type	Purchase Minimum Per Fund
A and J	Initial Investment	$1,000(1)
A and J	Initial Investment for accounts with an Automatic Investment Plan (AIP)	$100
A and J	Subsequent Investments	$100(1)(2)
Institutional, R-1, R-3, R-4, R-5, and R-6	There are no minimum initial or subsequent investment requirements for eligible purchases.	N/A

(1)Some exceptions apply; see "Purchase of Fund Shares - Minimum Investments" for more information.

(2)For accounts with an AIP, the subsequent automatic investments must total $1,200 annually if the initial $1,000 minimum has not been met.

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).

Effective January 31, 2017, the Registrant no longer offers Class R-1 shares for purchase from new retirement plans, except in limited circumstances. Effective as of the close of the New York Stock Exchange on September 1, 2024, Class R-4 shares will no longer be available for purchase from new retirement plans, except in limited circumstances. See Purchase of Fund Shares for more information.

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.

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