Summary Prospectus by Investment Company (Form 497K)

LARGECAP GROWTH FUND I

Class

A

J

Inst.

R-3

R-5

R-6

Ticker Symbol(s)

PLGAX

PLGJX

PLGIX

PPUMX

PPUPX

PLCGX

Principal Funds, Inc. Summary Prospectus March 1, 2026 as amended March 16, 2026

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, 2026, as may be amended or supplemented, are incorporated by reference into this Summary Prospectus.

Objective

The Fund seeks long-term growth 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 $50,000 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 398 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 69 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.

Shareholder Fees (fees paid directly from your investment)

Share Class

A

J

Inst.

R-3

R-5

R-6

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

5.50%

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

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-3			R-5			R-6
Management Fees			0.60%			0.60%			0.60%			0.60%			0.60%			0.60%
Distribution and/or Service (12b-1) Fees			0.25%			0.15%			N/A			0.25%			N/A			N/A
Other Expenses			0.10%			0.05%			0.09%			0.33%			0.27%			0.01%
Total Annual Fund Operating Expenses			0.95%			0.80%			0.69%			1.18%			0.87%			0.61%
Fee Waiver (1)			(0.02)%			(0.02)%			(0.02)%			(0.02)%			(0.02)%			(0.02)%
Total Annual Fund Operating Expenses after Fee Waiver			0.93%			0.78%			0.67%			1.16%			0.85%			0.59%

(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, 2027. The fee waiver will reduce the Fund's management fees by 0.016% (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.

1 of 5

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			$640			$834			$1,045			$1,651
Class J			180			253			442			988
Institutional Class			68			219			382			857
Class R-3			118			373			647			1,430
Class R-5			87			276			480			1,071
Class R-6			60			193			338			760

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			$80			$253			$442			$988

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 34.7% 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 growth equity securities of companies with large market capitalizations. For this Fund, large market capitalization growth equity securities are securities (i) with market capitalizations within the range of companies comprising the Russell 1000® Index (as of January 30, 2026, this was between approximately $1.2 billion and $4.7 trillion), and (ii) that are included within at least one of the following growth indices: the MSCI All Country World IMI Growth Index, the S&P 1500 Growth Index, or the Russell 3000 Growth Index. The Fund also invests in equity securities of companies with medium market capitalizations.

The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund's assets using an index sampling strategy designed to match the performance of the Russell 1000® Growth Index.

The Fund is considered non-diversified, which means it can invest a higher percentage of assets in securities of individual issuers than a diversified fund. As a result, changes in the value of a single investment could cause greater fluctuations in the Fund's share price than would occur in a more diversified fund.

2 of 5

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.

Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer's financial condition, unfavorable performance of the issuer's sector or industry, or changes in response to overall market and economic conditions. A fund's principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.

•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.

•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.

Non-Diversification Risk. A non-diversified fund may invest a high percentage of its assets in the securities of a small number of issuers and is more likely than diversified funds to be significantly affected by a specific security's poor performance.

Passive Strategy Risk. A portion of the Fund seeks to match the performance of a specified index. However, the correlation between the performance of this portion of the Fund and index performance may be affected by many factors, such as Fund expenses, the timing of cash flows into and out of the Fund, changes in securities markets, and changes in the composition of the index.

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/mutualfundperformance.

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.

3 of 5

Total Returns as of December 31

Highest return for a quarter during the period of the bar chart above:			Q2 2020			27.72		%
Lowest return for a quarter during the period of the bar chart above:			Q2 2022			(21.61)		%

Average Annual Total Returns

For the periods ended December 31, 2025

			1 Year			5 Years			10 Years
Class A Return Before Taxes			5.02%			7.92%			13.91%
Class A Return After Taxes on Distributions			1.20%			4.31%			10.89%
Class A Return After Taxes on Distributions and Sale of Fund Shares			5.17%			5.65%			10.84%
Class J Return Before Taxes			10.44%			9.33%			14.80%
Institutional Class Return Before Taxes			11.41%			9.45%			14.96%
Class R-3 Return Before Taxes			10.86%			8.92%			14.39%
Class R-5 Return Before Taxes			11.23%			9.27%			14.76%
Class R-6 Return Before Taxes			11.48%			9.54%			15.04%
Russell 1000 Index (reflects no deduction for fees, expenses, or taxes)			17.37%			13.59%			14.59%
Russell 1000 Growth Index (reflects no deduction for fees, expenses, or taxes)			18.56%			15.32%			18.13%

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.

The Russell 1000 Index is the Fund's primary broad-based securities market index. The Russell 1000 Growth 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 2009), Portfolio Manager

•Michael Messina (since 2025), Portfolio Manager

•May Tong (since 2025), Portfolio Manager

Sub-Advisors

Brown Advisory, LLC (delete on or about April 15, 2026)

Los Angeles Capital Management LLC (add on or about April 15, 2026)

T. Rowe Price Associates, Inc.

Westfield Capital Management Company, L.P. (add on or about April 15, 2026)

4 of 5

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-3, 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 801 Pennsylvania Ave., Ste. 219971, Kansas City, MO 64105-1307 (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.

5 of 5