Strategic Asset Management ("SAM") Balanced Portfolio
 
Class R-1
Class R-2
Class R-3
Class R-4
Class R-5
Institutional
Ticker Symbol(s)
PSBGX
PSBVX
PBAPX
PSBLX
PSBFX
PSBIX

Principal Funds, Inc. Summary Prospectus March 1, 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 R-1, R-2, R-3, R-4, R-5, Institutional shares dated March 1, 2013 and the Statement of Additional Information dated March 1, 2013 (which may be obtained in the same manner as the Prospectus).
Objective:
The Portfolio seeks to provide as high a level of total return (consisting of reinvested income and capital appreciation) as is consistent with reasonable risk.
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.
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)
 
Institutional
Class
Class
R-1
Class
R-2
Class
R-3
Class
R-4
Class
R-5
Management Fees
0.33%
0.33%
0.33%
0.33%
0.33%
0.33%
Distribution and/or Service (12b-1) Fees
N/A
0.35%
0.30%
0.25%
0.10%
N/A
Other Expenses
0.02%
0.54%
0.46%
0.33%
0.29%
0.27%
Acquired Fund Fees and Expenses
0.67%
0.67%
0.67%
0.67%
0.67%
0.67%
Total Annual Fund Operating Expenses
1.02%
1.89%
1.76%
1.58%
1.39%
1.27%

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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
Institutional Class
$
104

$
325

$
563

$
1,248

Class R-1
192

594

1,021

2,212

Class R-2
179

554

954

2,073

Class R-3
161

499

860

1,878

Class R-4
142

440

761

1,669

Class R-5
129

403

697

1,534

Portfolio Turnover
As a fund of funds, the Fund does not pay transaction costs, such as commissions, when it buys and sells shares of underlying funds (or “turns over” its portfolio). An underlying fund does pay transaction costs when it buys and sells portfolio securities, and a higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in annual fund operating expenses or in the examples, affect the performance of the underlying fund and the Fund. During its most recent fiscal year, the Fund's portfolio turnover rate was 9.6% of the average value of its portfolio.
Principal Investment Strategies
The SAM Portfolios operate as funds of funds and invest principally in Institutional Class shares of Principal Funds, Inc. equity funds, fixed-income funds and specialty funds ("Underlying Funds"); the Sub-Advisor generally categorizes the Underlying Fund based on the investment profile of the Underlying Fund. Each SAM Portfolio typically allocates its assets among Underlying Funds, and within predetermined percentage ranges, as determined by the Sub-Advisor in accordance with its outlook for the economy, the financial markets and the relative market valuations of the Underlying Funds.
The Portfolio:
Generally invests between 20% and 60% of its assets in fixed-income funds, and less than 40% in any one fixed-income fund (fixed-income funds that generally invest in fixed income instruments such as mortgage-backed securities, government and government-sponsored securities and corporate bonds)
Generally invests between 40% and 80% of its assets in equity funds, and less than 30% in any one equity fund (equity funds that generally invest in domestic and foreign (including emerging markets) equity securities) and
Generally invests less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund (specialty funds that generally offer unique combinations of traditional equity securities and fixed-income securities or that use alternative investment strategies that aim to offer enhanced diversification beyond traditional equity securities and fixed-income securities)
The Portfolio may temporarily exceed the applicable percentage ranges for short periods, and the Sub-Advisor may alter the percentage ranges when it deems appropriate.

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Principal Risks
The broad diversification of the Portfolio is designed to cushion severe losses in any one investment sector and moderate overall price volatility. However, the Portfolio is subject to the particular risks of the Underlying Funds in which it invests, and its share prices and performance will fluctuate with the shares prices and performance of the Underlying Funds. The Portfolio operates as a fund of funds and thus bears both its own expenses and, indirectly, its proportionate share of the expenses of the underlying funds in which it invests. An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. If you sell your shares when their value is less than the price you paid, you will lose money.
The principal risks of investing in the Portfolio that are inherent in the fund of funds, 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.
Conflict of Interest Risk. The Advisor and its affiliates earn different fees from different underlying funds and may have an incentive to allocate more fund-of-fund assets to underlying funds from which they receive higher fees.
Investment Company Securities Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies in which the fund invests.
The principal risks of investing in the Portfolio that are inherent in the underlying funds, in alphabetical order, are:
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.
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 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.
Investment Company Securities Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies in which the fund invests.
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.

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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).
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.
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities.
U.S. Government Sponsored Securities Risk. Securities issued by U.S. government-sponsored or -chartered 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. Treasury.
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 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 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.principal.com or by calling 1-800-222-5852.
The Portfolio commenced operations after succeeding to the operations of another fund on January 12, 2007. Performance for periods prior to that date is based on the performance of the predecessor fund’s Class A shares adjusted to reflect the fees and expenses of these classes. The adjustments result in performance (for periods prior to the date these classes began operations) that is no higher than the historical performance of Class A shares. The predecessor fund commenced operations on July 25, 1996.
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. The weightings for Capital Benchmark (60/40) are 60% S&P 500 Index and 40% Barclays Aggregate Bond Index. Effective June 30, 2013, the Fund will use a new blended index, the SAM Balanced Blended Index. The weightings for SAM Balanced Blended Index are 45% Russell 3000 ® Index, 15% MSCI EAFE Index NDTR D and 40% Barclays Aggregate Bond Index. The custom or blended index returns reflect the allocation in effect for the time period(s) for which the fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated. Effective June 30, 2013, the Fund’s primary benchmark will change from the S&P 500 Index to the Russell 3000 ® Index because the Russell 3000 ® Index is a better benchmark for the Fund’s performance due to the market capitalizations it represents.

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Total Returns as of December 31 each year (Institutional Class shares)
Highest return for a quarter during the period of the bar chart above:
Q2 '09
13.57
 %
Lowest return for a quarter during the period of the bar chart above:
Q4 '08
-14.44
 %
Average Annual Total Returns
For the periods ended December 31, 2012
1 Year
5 Years
10 Years
Institutional Class Return Before Taxes
12.67%
3.49%
7.08%
Institutional Class Return After Taxes on Distributions
12.00%
2.49%
6.16%
Institutional Class Return After Taxes on Distribution and Sale of Fund Shares
8.55%
2.55%
5.81%
Class R-1 Return Before Taxes
11.77%
2.59%
6.45%
Class R-2 Return Before Taxes
11.86%
2.71%
6.58%
Class R-3 Return Before Taxes
12.09%
2.91%
6.73%
Class R-4 Return Before Taxes
12.36%
3.11%
6.85%
Class R-5 Return Before Taxes
12.41%
3.22%
6.92%
S&P 500 Index (reflects no deduction for fees, expenses, or taxes)
16.00%
1.66%
7.10%
Barclays Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
4.21%
5.95%
5.18%
Capital Benchmark (60/40)   (reflects no deduction for fees, expenses, or taxes)
11.31%
3.81%
6.62%
Russell 3000 Index   (reflects no deduction for fees, expenses, or taxes)
16.42%
2.04%
7.68%
MSCI EAFE Index NDTR D (reflects no deduction for fees, expenses, or taxes)
17.32%
-3.69%
8.21%
SAM Balanced Blended Index (reflects no deduction for fees, expenses, or taxes)
11.77%
3.26%
7.13%
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 Institutional Class shares only and would be different for Class R-1, R-2, R-3, R-4 and R-5 shares.
Management
Investment Advisor:     Principal Management Corporation
Sub-Advisor(s) and Portfolio Manager(s):
Edge Asset Management, Inc.
Charles D. Averill (since 2010), Portfolio Manager
Jill R. Cuniff (since 2010), President and Portfolio Manager
Todd A. Jablonski (since 2010), Portfolio Manager

Page 5 of 6



Purchase and Sale of Fund Shares
There are no restrictions on amounts to be invested in shares of the Fund for an eligible purchaser. 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 or intermediary; 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.



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