Global Diversified Income Fund
 
Class A
Class C
Class P
Ticker Symbol(s)
PGBAX
PGDCX
PGDPX

Principal Funds, Inc. Summary Prospectus March 1, 2013 amended September 20, 2013
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 and other information about the Fund online at www.principalfunds.com/prospectus. You can also get this information at no cost by calling 1-800-222-5852 or by sending an email request to prospectus@principalfunds.com.

This Summary Prospectus incorporates by reference the Statutory Prospectus for Classes A, B, C, and P shares dated March 1, 2013 as supplemented on March 14, 2013, March 28, 2013, April 2, 2013, May 9, 2013, June 14, 2013, and September 20, 2013 and the Statement of Additional Information dated March 1, 2013 as supplemented on March 15, 2013, April 2, 2013, April 17, 2013, May 9, 2013, June 14, 2013, September 13, 2013, and September 20, 2013 (which may be obtained in the same manner as the Prospectus).
Objective:
The Fund seeks consistent cash income through a diversified, yield-focused investment strategy.
Fees and Expenses of the Fund
This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. 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 Principal Funds, Inc. More information about these and other discounts is available from your financial professional and in “Choosing a Share Class and The Costs of Investing” beginning on page 214, of the Fund’s prospectus and “Multiple Class Structure” beginning on page 66 of the Fund’s Statement of Additional Information .
Shareholder Fees (fees paid directly from your investment)
 
Class A
Class C
Class P
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)
3.75%
None
None
Maximum Deferred Sales Charge (Load) (as a percentage of the offering price or NAV at the time Sales Load is paid, whichever is less)
1.00%
1.00%
None

Page 1 of 8


Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
 
Class A
Class C
Class P
Management Fees
0.75%
0.75%
0.75%
Distribution and/or Service (12b-1) Fees
0.25%
1.00%
N/A
Other Expenses
0.13%
0.14%
0.15%
Total Annual Fund Operating Expenses
1.13%
1.89%
0.90%
Expense Reimbursement (1)
—%
—%
—%
Total Annual Fund Operating Expenses after Expense Reimbursement
1.13%
1.89%
0.90%
(1)
Principal Management Corporation ("Principal"), the investment advisor, has contractually agreed to limit the Fund’s expenses attributable to Class A and Class C shares, and expenses identified as "Other Expenses" for Class P by paying, if necessary, expenses normally payable by the Fund, excluding interest expense, through the period ending February 28, 2014 . The expense limit will maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 1.25% for Class A and 2.00% for Class C shares, excluding interest expense. In addition, for Class P, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.20%, excluding interest expense. It is expected that the expense limit will continue through the period disclosed; however, Principal Funds, Inc. and Principal, the parties to the agreement, may agree to terminate the expense limit 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. 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
$486
$721
$974
$1,698
Class C
$292
$594
$1,021
$2,212
Class P
$92
$287
$498
$1,108
You would pay the following expenses if you did not redeem your shares:
 
1 year
3 years
5 years
10 years
Class A
$486
$721
$974
$1,698
Class C
$192
$594
$1,021
$2,212
Class P
$92
$287
$498
$1,108
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 50.8% of the average value of its portfolio.

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Principal Investment Strategies
The Fund generally invests a majority of its assets in fixed income asset classes, such as high yield bonds, preferred securities, commercial mortgage-backed securities, and emerging market debt securities, in an effort to provide incremental yields over a portfolio of government securities. In addition, the Fund invests in equity securities of global companies principally engaged in the real estate industry, equity securities of global infrastructure companies, master limited partnerships ("MLPs") and other entities in the energy infrastructure sector and value equities of global companies to provide dividend yields and diversify fixed income-related risks in the Fund. The Fund invests in foreign securities, which are:
•
companies with their principal place of business or principal office outside the U.S. or
•
companies whose principal securities trading market is outside the U.S.
In managing the Fund, Principal Management Corporation ("Principal"), the Fund’s investment advisor, determines the Fund's strategic asset allocation among the following general investment categories, which are executed by multiple sub-advisors: high yield, preferred securities, emerging market debt, global real estate, commercial mortgage-backed securities, MLPs, global value equity, and publicly-traded infrastructure. The Fund may add additional investment categories. The Fund seeks to provide yield by having each sub-advisor focus on those securities offering the best risk-adjusted yields within their respective asset class.
The Fund also writes (or sells) call options by using equity index/exchange traded fund (“ETF”) call options on the indices represented by certain asset categories of the Fund, including global real estate, global value equity, MLPs, and publicly-traded infrastructure. Call option overwriting is an investment strategy that is used to generate income through receipt of the call option premium and reduce portfolio volatility.
A portion of the Fund's assets is invested in high yield and other income-producing securities including bank loans, corporate bonds, corporate loan participations and assignments, and securities of companies in bankruptcy proceedings or otherwise in the process of debt restructuring. These include foreign securities issued in both USD and non-USD. "High yield" securities are below investment grade bonds (sometimes called "junk bonds") which are rated at the time of purchase Ba1 or lower by Moody's and BB+ or lower by S&P (if the bond has been rated by only one of those agencies, that rating will determine whether the bond is below investment grade; if the bond has not been rated by either of those agencies, the Sub-Advisor will determine whether the bond is of a quality comparable to those rated below investment grade). These securities offer a higher yield than other, higher rated securities, but they carry a greater degree of risk and are considered speculative with respect to the issuer's ability to pay interest and to repay principal.
A portion of the Fund's assets is invested primarily in preferred securities of U.S. and non-U.S. companies primarily rated BBB- or higher by S&P or Baa3 or higher by Moody's or, if unrated, of comparable quality in the opinion of the Sub-Advisor. This portion of the Fund focuses primarily on the financial services, real estate investment trust "(REIT"), and utility industries.
A portion of the Fund’s assets is invested in a diversified portfolio of fixed income securities and derivative instruments issued primarily by governments, their agencies, local authorities and instrumentalities and corporate entities domiciled in or exercising the predominant part of their economic activities in emerging markets. Here, "emerging market country" means any country which is considered to be an emerging country by the international financial community (including the International Bank for Reconstruction and Development (also known as the World Bank) and MSCI Emerging Markets Index) and any country included in any J.P. Morgan emerging market bond index. These countries generally include every nation in the world except the United States, Canada, Japan, Australia, and New Zealand, and most nations located in Western Europe.
A portion of the Fund's assets is invested in equity securities of global real estate companies. A real estate company has at least 50% of its assets, income or profits derived from products or services related to the real estate industry. Real estate companies include real estate investment trusts ("REITs"), REIT-like entities, and companies with substantial real estate holdings such as paper, lumber, hotel and entertainment companies as well as building supply manufacturers, mortgage lenders, and mortgage servicing companies.
A portion of the Fund’s assets is invested in commercial mortgage-backed securities, which are bonds that are secured by first mortgages on commercial real estate.

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A portion of the Fund's assets is invested in MLPs and companies that are organized as corporations, limited liability companies or limited partnerships in the energy infrastructure sector. Energy infrastructure companies are engaged in the transportation, storage, processing, refining, marketing, exploration, production, or mining of any mineral or natural resource. The Fund invests primarily in the mid-stream energy infrastructure market, which is comprised mostly of the following: crude oil and refined products pipeline, storage, and terminal assets; natural gas gathering and transportation pipelines, processing, and storage facilities; propane distributors; energy commodity marine transportation (including liquefied natural gas transportation and processing); and other energy infrastructure assets. Most pipelines do not own the energy products they transport and, as a result, are not directly exposed to commodity price risk.
A portion of the Fund's assets is invested in a diversified portfolio of value equity securities of companies located or operating in developed countries (including the United States) and emerging markets of the world to provide dividend yields. The equity securities are ordinarily traded on a recognized foreign securities exchange or traded in a foreign over-the-counter market in the country where the issuer is principally based, but may also be traded in other countries including the United States.
A portion of the Fund’s assets is invested in publicly-listed infrastructure companies (domestic and foreign public utility and energy companies). Publicly-listed infrastructure equity securities trade on an exchange and include companies involved to a significant extent in providing products, services or equipment for: the generation, transmission or distribution of electricity, gas or water (utilities); or telecommunications activities as well as in companies involved in the discovery, development, production, generation, transmission, refinement, measurement, trading, marketing or distribution of energy.
On or about November 6, 2013, delete the preceding paragraph that begins “A portion of the Fund's assets is invested in publicly-listed infrastructure companies” and substitute:
A portion of the Fund's assets is invested in publicly-listed infrastructure companies (domestic and foreign public utility, energy, and transportation companies). Publicly-listed infrastructure equity securities trade on an exchange and include companies involved to a significant extent in providing products, services or equipment for: transportation (including toll roads, airports, railways, and ports); the generation, transmission or distribution of electricity, gas or water (utilities); or telecommunications activities as well as in companies involved in the discovery, development, production, generation, transmission, refinement, measurement, trading, marketing or distribution of energy.
During the fiscal year ended October 31, 2012, the average ratings of the Fund’s fixed-income assets, based on market value at each month-end, were as follows (all ratings are by Moody’s):
 1.11% in securities rated Aaa
15.88% in securities rated Ba
0.00% in securities rated C
 1.46% in securities rated Aa
29.58% in securities rated B
0.03% in securities rated D
 8.95% in securities rated A
  8.81% in securities rated Caa
4.24% in securities not rated
29.85% in securities rated Baa
  0.09% in securities rated Ca
 
Principal Risks
The Fund may be an appropriate investment for investors seeking high cash returns, who are willing to accept the risk associated with investing in equities and below-investment-grade fixed income securities.
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, in alphabetical order, are:
Asset Allocation Risk. A fund's selection and weighting of asset classes may cause it to underperform other funds with a similar investment objective.

Page 4 of 8


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 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.
Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
Derivatives Risk. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so and produce disproportionate losses.
Emerging Market Risk. Investments in emerging market countries may have more risk than those in developed market countries because the emerging markets are less developed and more illiquid. Emerging market countries can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile.
Equity Index/Exchange-traded Fund (“ETF”) Call Option Risk. As the writer of an equity index/exchange-traded fund (“ETF”) call option, a fund forgoes, during the option’s life, the opportunity to profit from increases in the market value of the index on which the call option has been written above the sum of the premium and the strike price of the call, but has retained the risk of loss should the price of the underlying index decline (net of premiums received). In addition, a fund bears the risk that the index/ETF on which the call option has been written behaves differently than the underlying stocks in the portfolio which would limit the ability of the call option overwriting strategy to reduce portfolio volatility.
Equity Securities Risk. The value of equity securities could decline if the issuer's financial condition declines or in response to overall market and economic conditions. A fund's principal market segment(s), such as large cap, mid cap or small cap stocks, or growth or value stocks, may underperform other market segments or the equity markets as a whole. Investments in smaller companies and mid-size companies may involve greater risk and price volatility than investments in larger, more mature companies.
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate risk and credit quality risk. The market value of fixed-income securities generally declines when interest rates rise, and an issuer of fixed-income securities could default on its payment obligations.
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.
Master Limited Partnership ("MLP") Risk. MLPs are publicly-traded limited partnership interests or units. An MLP that invests in a particular industry (e.g., oil and gas) will be harmed by detrimental economic events within that industry. As partnerships, MLPs may be subject to less regulation (and less protection for investors) under state laws than corporations. In addition, MLPs may be subject to state taxation in certain jurisdictions, which may reduce the amount of income an MLP pays to its investors.
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.
Preferred Securities Risk. Preferred securities are junior subordinated securities in a company’s capital structure and therefore can be subject to greater credit and liquidation risk. An issuer of preferred securities could redeem the security prior to the stated maturity date and reduce the return of the security.

Page 5 of 8


Prepayment Risk. Unscheduled prepayments on mortgage-backed and asset-backed securities 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).
Real Estate Investment Trusts (“REITs”) Risk. A REIT could fail to qualify for tax-free pass-through of income under the Internal Revenue Code, and fund shareholders will indirectly bear their proportionate share of the expenses of REITs in which the fund invests.
Real Estate Securities Risk. Real estate securities are subject to the risks associated with direct ownership of real estate, including declines in value, adverse economic conditions, increases in expenses, regulatory changes and environmental problems. Investing in securities of companies in the real estate industry, subjects a fund to the special risks associated with the real estate market including factors such as loss to casualty or condemnation, changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use and rents, and the management skill and creditworthiness of the issuer.
Risk of Being an Underlying Fund. A fund is subject to the risk of being an underlying fund to the extent that a fund of funds invests in the fund. An underlying fund of a fund of funds may experience relatively large redemptions or investments as the fund of funds periodically reallocates or rebalances its assets. These transactions may cause the underlying fund to sell portfolio securities to meet such redemptions, or to invest cash from such investments, at times it would not otherwise do so, and may as a result increase transaction costs and adversely affect underlying fund performance.
Value Stock Risk. The market may not recognize the intrinsic value of value stocks for a long time, or they may be appropriately priced at the time of purchase.
Performance
The following information provides an indication of the risks of investing in the Fund. 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; if they did, results would be lower. The table shows, for each share class of the Fund and 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 to the returns of one or more broad-based market indices. 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 online at www.principalfunds.com or by calling 1-800-222-5852.
Life of Fund results are measured from the date the Fund’s shares were first sold ( December 15, 2008 ).
Class P shares were first sold on September 27, 2010. The return for the periods prior to that date are based on the performances of the Institutional Class shares adjusted to reflect the fees and expenses of Class P shares. The adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares. The Institutional Class shares were first sold on December 15, 2008.
Performance of a blended index shows how the Fund’s performance compares to an index with similar investment objectives. Performance of the components of the blended index are also shown. Currently the weightings for the Global Diversified Income Custom Index are 35% Barclays U.S. Corporate High Yield 2% Issuer Capped Index; 15% blend of 50% BofA Merrill Lynch Fixed Rate Preferred Securities Index and 50% Barclays U.S. Tier I Capital Securities Index; 15% J.P. Morgan EMBI Global Diversified Index; 10% Barclays Investment Grade CMBS Index; 10% blend of 10% S&P 500 Energy Index, 25% S&P 500 Telecom Services Index, and 65% S&P 500 Utilities Index; 7% MSCI All Country World Value Index; 5% Tortoise Midstream MLP Index; and 3% FTSE EPRA/NAREIT Developed Index. The custom or blended index returns reflect the allocation in effect for the time period(s) for which fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.

Page 6 of 8


Total Returns as of December 31 each year (Class A shares)
Highest return for a quarter during the period of the bar chart above:
Q2 '09
20.93
 %
Lowest return for a quarter during the period of the bar chart above:
Q3 '11
-8.15
 %

Average Annual Total Returns
For the periods ended December 31, 2012
1 Year
Life of Fund
Class A Return Before Taxes
11.32%
17.10%
Class A Return After Taxes on Distributions
9.17%
13.94%
Class A Return After Taxes on Distribution and Sale of Fund Shares
7.58%
12.98%
Class C Return Before Taxes
13.77%
17.32%
Class P Return Before Taxes
15.88%
18.28%
Barclays U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses, or taxes)
15.78%
24.73%
BofA Merrill Lynch Fixed Rate Preferred Securities Index (reflects no deduction for fees, expenses, or taxes)
13.60%
15.60%
Barclays U.S. Tier I Capital Securities Index (reflects no deduction for fees, expenses, or taxes)
21.88%
19.85%
J.P. Morgan EMBI Global Diversified Index (reflects no deduction for fees, expenses, or taxes)
17.44%
17.74%
Barclays Investment Grade CMBS Index (reflects no deduction for fees, expenses, or taxes)
6.85%
15.76%
S&P 500 Energy Index (reflects no deduction for fees, expenses, or taxes)
4.61%
10.55%
S&P 500 Telecom Services Index (reflects no deduction for fees, expenses, or taxes)
18.31%
14.47%
S&P 500 Utilities Index (reflects no deduction for fees, expenses, or taxes)
1.29%
10.34%
MSCI All Country World Value Index (reflects no deduction for fees, expenses, or taxes)
15.55%
12.31%
Tortoise Midstream MLP Index (reflects no deduction for fees, expenses, or taxes)
6.02%
30.57%
FTSE EPRA/NAREIT Developed Index (reflects no deduction for fees, expenses, or taxes)
28.65%
21.12%
Global Diversified Income Custom Index (reflects no deduction for fees, expenses, or taxes)
15.67%
21.19%
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 Class C and Class P shares.

Page 7 of 8


Management
Investment Advisor and Portfolio Managers:
Principal Management Corporation
• Michael P. Finnegan (since 2010), Chief Investment Officer
• Kelly Grossman (since 2010), Senior Product Manager
•
Dave Reichart (since 2011), Senior Vice President
Sub-Advisors:
Colonial First State Asset Management (Australia) Limited (effective on or about November 6, 2013)
DDJ Capital Management, LLC
Guggenheim Partners Investment Management, LLC
Post Advisory Group, LLC
Principal Global Investors, LLC
Principal Real Estate Investors, LLC
Spectrum Asset Management, Inc.
Stone Harbor Investment Partners LP
Tortoise Capital Advisors, L.L.C.
W. H. Reaves & Co., Inc. (doing business as Reaves Asset Management)
Purchase and Sale of Fund Shares
Purchase minimums per fund (some exceptions apply):
•      For Class P shares
•      There are no restrictions on amounts to be invested in Class P shares of the Fund for an eligible purchaser.
•      For share classes other than Class P: Initial Investment

$1000

•    For accounts with an Automatic Investment Plan (AIP)

$100

•      For share classes other than Class P: Subsequent Investments

$100

•      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 Financial Professional; by sending a written request to Principal Funds at P.O. Box 8024, Boston, MA 02266-8024 (regular mail) or 30 Dan Road, Canton, MA 02021-2809 (overnight mail); calling us at 1-800-222-5852; or accessing our website (www.principalfunds.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, insurance company, investment adviser, etc.), 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.

Page 8 of 8
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