* Unannualized rate of return (change in value) since the start of the year.

Returns shown for periods of less than one year are not annualized.

Insurance products and plan administrative services, if applicable, are provided by Principal Life Insurance Company a member of the Principal Financial Group, Des Moines, IA 50392. Principal Funds, Inc. is distributed by Principal Funds Distributor, Inc., 800-547-7754, member SIPC. Securities are offered through Principal Securities, Inc. and/or independent brokers/dealers. Principal Funds Distributor, Principal Securities and Principal Life are members of the Principal Financial Group^®, Des Moines, IA 50392.

Principal Funds, Inc. is distributed by and securities offered through Principal Securities, Inc. member SIPC, 800-547-7754. Principal Securities is a member of Principal Financial Group, Des Moines, IA 50392. See the Principal Funds, Inc. prospectus for the full name of each Fund.

Investors should carefully consider a mutual fund’s investment objectives, risks, charges, and expenses prior to investing. A prospectus, or summary prospectus if available, containing this and other information can be obtained by contacting a financial professional, visiting principal.com, or calling 800-547-7754. Read the prospectus carefully before investing.

Only eligible purchasers may buy Institutional Class shares of the Funds. At the present time, eligible purchasers include but are not limited to: Separate Accounts of Principal Life; Principal Life or any of its subsidiaries or affiliates; any fund distributed by Principal Funds Distributor, Inc. and/or Princor Financial Services Corporation ("Princor") (together, the "Distributors") if the fund seeks to achieve its investment objective by investing primarily in shares of mutual funds; clients of Principal Global Investors, LLC.; sponsors, recordkeepers, or administrators of wrap account or mutual fund asset allocation programs or participants in those programs; certain pension plans; certain retirement account investment vehicles administered by foreign or domestic pension plans; an investor who buys shares through an omnibus account with certain intermediaries, such as a brokers/dealer, bank, or other financial institution, pursuant to a written agreement; and certain institutional clients that have been approved by Principal Life Insurance Company for purposes of providing plan record keeping. All funds listed may not be available to each eligible purchaser.

Investment Types
Short-Term Fixed Income - This asset class is generally comprised of short-term, fixed-income investment options that are largely liquid and are designed to not lose much value. These investment options may include stable value, money market, short-term bond, and guaranteed interest accounts. They are considered to be among the least risky forms of investment options. However, they typically have a lower rate of return than equities or longer-term fixed income investment options over long periods of time. Depending on the objectives of the investment options, they may experience price fluctuations and may lose value.
Fixed Income - This asset class is generally comprised of investment options that invest in bonds, or debt of a company or government entity (including U.S. and Non- U.S.). It may also include real estate investment options that directly own property. These investment options typically carry more risk than short-term fixed income investment options (including, for real estate investment options, liquidity risk), but less overall risk than equities. All investment options in this category have the potential to lose value.
Balanced/Asset Allocation - This asset class is generally comprised of a combination of fixed income and equity investment options. These investment options may include balanced, asset allocation, target-date, and target-risk investment options. Although typically lower risk than investment options that invest solely in equities, all investment options in this category have the potential to lose value.
Large U.S. Equity - This asset class is generally comprised of investment options that invest in stocks, or shares of ownership in large, well-established, U.S. companies. These investment options typically carry more risk than fixed income investment options but have the potential for higher returns over longer time periods. They may be an appropriate choice for long-term investors who are seeking the potential for growth. All investment options in this category have the potential to lose value.
Small/Mid US Equity - This asset class is generally comprised of investment options that invest in stocks, or shares of ownership in small to medium-sized U.S. companies. These investment options typically carry more risk than larger U.S. equity investment options but have the potential for higher returns. They may be an appropriate choice for long-term investors who are seeking the potential for growth. All investment options in this category have the potential to lose value.
Global/International Equity - This asset class is comprised of investment options that invest in stocks, or shares of ownership in companies with their principal place of business or office outside the United States. These investment options often carry more risk than U.S. equity investment options but may have the potential for higher returns. They may be an appropriate choice for long-term investors who are seeking the potential for growth. All investment options in this category have the potential to lose value.

Footnotes:

	1.	Small-cap and mid-cap investment options are subject to more fluctuation in value and may have additional risks than other investment options with stocks of larger, more stable companies.
	2.	Each index based investment option is invested in the stocks or bonds of the index it tracks. Performance of indexes reflects the unmanaged results for the market segment the selected stocks or bonds represent. There is no assurance an index based investment option will match the performance of the index tracked.
	3.	International and global investment options are subject to additional risk due to fluctuating exchange rates, foreign accounting and financial policies, and other economic and political environments.
	4.	High yield investment options are subject to greater credit risk and volatility that is associated with high yield bonds.
	5.	Real Estate investment options are subject to investment and liquidity risk and other risks inherent in real estate such as those associated with general and local economic conditions. Property values can decline due to environmental and other reasons. In addition, fluctuation in interest rates can negatively impact the performance of real estate investment options.
	6.	S&P 500 is a trademark of S&P Global and is used under license. The product is not sponsored, endorsed, sold or promoted by Standard & Poor's and Standard & Poor's makes no representation regarding the advisability of investing in the product.
	7.	S&P 600 is a trademark of S&P Global and is used under license. The product is not sponsored, endorsed, sold or promoted by Standard & Poor's and Standard & Poor's makes no representation regarding the advisability of investing in the product.
	8.	S&P 400 is a trademark of S&P Global and is used under license. The product is not sponsored, endorsed, sold or promoted by Standard & Poor's and Standard & Poor's makes no representation regarding the advisability of investing in the product.
	9.	Not all funds associated with the institutional class shares of the Principal Funds series are registered in every state. These funds will be appropriately registered for use upon selection for your retirement plan.
	10.	These calculated returns reflect the historical performance of the oldest share class of the fund, adjusted to reflect a portion of the fees and expenses of this share class. For time periods prior to inception date of the fund, predecessor performance is reflected. Please see the fund's prospectus for more information on specific expenses, and the fund's most recent shareholder report for actual date of first sale. Expenses are deducted from income earned by the fund. As a result, dividends and investment results will differ for each share class.
	11.	Infrastructure companies may be subject to a variety of factors that may adversely affect their business, including high interest costs, high leverage, regulation costs, economic slowdown, surplus capacity, increased competition, lack of fuel availability, and energy conservation policies.
	12.	Risk is magnified in emerging markets, which may lack established legal, political, business, or social structures to support securities markets and/or may be subject to trading suspensions, government interventions, or other interference.
	13.	The Fund is non-diversified and may be more susceptible to price volatility if the Fund does not meet its objective.
	14.	Environmental, social and governance responsible investing (ESG) is qualitative and subjective by nature, and there is no guarantee that the criteria utilized, or judgment exercised, will reflect the beliefs or values of any one particular investor. Information regarding responsible practices is obtained through voluntary or third-party reporting, which may or may not be accurate or complete, and such information is used to evaluate a company's commitment to, or implementation of, responsible practices. Socially responsible norms differ by region. ESG, while a component of our investment analysis, is only one part of the overall assessment in our decision-making activities. ESG criteria may present additional advantages or risks and does not protect against market risks or volatility. You should not make any investment assumptions based solely on the information contained herein. There is no assurance that the socially responsible investing strategy and techniques employed will be successful.
	15.	Equity investment options involve greater risk, including heightened volatility, than fixed-income investment options. Fixed-income investment options are subject to interest rate risk, and their value will decline as interest rates rise.
	16.	Asset allocation does not guarantee a profit or protect against a loss. Investing in real estate, small-cap, international, and high-yield investment options involves additional risks.
	17.	Small-cap and mid-cap stocks may have additional risks, including greater price volatility.
	18.	Fixed-income investment options are subject to interest rate risk, and their value will decline as interest rates rise. Neither the principal of bond investment options nor their yields are guaranteed by the U.S. government.
	19.	Fixed-income and asset allocation investment options that invest in mortgage securities are subject to increased risk due to real estate exposure.
	20.	Instances of high double-digit returns were achieved primarily during favorable market conditions and may not be sustainable over time.
	21.	Fixed-income investment options are subject to interest rate risk, and their value will decline as interest rates rise. Lower-rated securities are subject to additional credit and default risks. Risks associated with preferred securities differ from risks inherent with other investments. In particular, in the event of bankruptcy, a company's preferred securities are senior to common stock but subordinated to all other types of corporate debt. International investing involves increased risks due to currency fluctuations, political or social instability, and differences in accounting standards, these risks are magnified in emerging markets. REIT securities are subject to risk factors associated with the real estate industry and tax factors of REIT registration.
	22.	The manager of the Fund, Principal Global Investors, invests between 10% and 40% of the Fund's assets in common stocks in an attempt to match or exceed the performance of the Fund's benchmark index for performance.
	23.	Asset allocation and diversification do not ensure a profit or protect against a loss. Additionally there is no guarantee this investment option will provide adequate income at or through retirement.
	24.	Fixed-income investment options are subject to interest rate risk, and their value will decline as interest rates rise. Neither the principal of bond investment options nor their yields are guaranteed by the U.S. or any other government entity. Concentrating investments in natural resources industries can be affected significantly by events relating to those industries, such as variations in the commodities markets, weather, disease, embargoes, international, political and economic developments, the success of exploration projects, tax and other government regulations and other factors. Investment in derivatives entails specific risks relating to liquidity, leverage and credit that may reduce returns and/or increase volatility. REIT securities are subject to risk factors associated with the real estate industry and tax factors of REIT registration.
	25.	The Investment Advisor will display "Multiple Sub-Advisors" for certain target-date, target-risk and specialty investment options where the assets are directed by the Investment Manager to multiple underlying investment options. These underlying investment options may use multiple sub-advisors who are responsible for the day-to-day management responsibilities.
	26.	The International Equity Index investment option described herein is indexed to an MSCI index.
	27.	The funds or securities referred to herein are not sponsored, endorsed, or promoted by MSCI, and MSCI bears no liability with respect to any such funds or securities or any index on which such funds or securities are based. The Principal International Equity Index Fund's Statement of Additional Information contains a more detailed description of the limited relationship MSCI has with Principal and any related funds.
	28.	This fund utilizes alternative investment strategies such as arbitrage, leverage, derivatives, and shorting securities in addition to traditional investments. Investment risk may be magnified with the use of these alternative strategies. In addition, securities such as bonds, equities, commodities, international and emerging market securities, and currencies are used to implement the investment strategy. These investments are subject to risks associated with market and interest rate movements. The fund is considered non-diversified which may make it more susceptible to price volatility if the fund does not meet its objective. Due to the nature of the investment process, investors should not expect significant outperformance during market rallies. Additional risks are included in the funds prospectus. It is possible to lose money when investing in the fund.
	29.	The risks associated with derivative investments include that the underlying security, interest rate, market index, or other financial asset will not move in the direction the Investment Adviser and/or Sub-Advisor anticipated, the possibility that there may be no liquid secondary market, the risk that adverse price movements in an instrument can result in a loss substantially greater than a fund's initial investment, the possibility that the counterparty may fail to perform its obligations; and the inability to close out certain hedged positions to avoid adverse tax consequences.
	30.	International and global investing involves greater risks such as currency fluctuations, political/social instability and differing accounting standards.
	31.	Fixed-income investment options are subject to interest rate risk, and their value will decline as interest rates rise. Risks of preferred securities differ from risks inherent in other investments. In particular, in a bankruptcy preferred securities are senior to common stock but subordinate to other corporate debt. Contingent capital securities (CoCos) may have substantially greater risk than other securities in times of financial stress. An issuer or regulators decision to write down, write off or convert a CoCo may result in complete loss on an investment.
	32.	Additional target date portfolios may be added to the Principal LifeTime portfolios series to accommodate plan participants with later normal retirement dates as they enter the workforce. Participants may also choose a portfolio with a target date that does not match the intended retirement date. Compare the different portfolios to see how the mix of investments might shift.
	33.	This investment option is considered non-diversified, which means it, or the underlying mutual fund, can invest a higher percentage of its assets in of fewer individual issuers than a diversified investment. As a result, changes in the value of a single investment could cause greater fluctuations, gain or loss, in the net asset value than would occur if it was more diversified.
	34.	Selecting a target date fund series is also authorizing any additional vintage which is launched by the investment provider for the series, and included in their associated materials, to be added to the plan after proper notification.
	35.	There is no guarantee that a target date investment will provide adequate income at or through retirement. A target date fund's (TDF) glidepath is typically set to align with a retirement age of 65, which maybe your plan's normal retirement date (NRD). If your plan's NRD/age is different, the plan may default you to a TDF based on the plans NRD/Age. Participants may choose a TDF that does not match the plan's intended retirement date but instead aligns more to their investment risk. Compare the different TDF's to see how the mix of investments shift based on the TDF glide path.