0000898745 2012-09-14 2012-09-14 0000898745 ck0000898745:S000024296Member ck0000898745:C000092706Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000024296Member ck0000898745:C000071808Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000024296Member ck0000898745:C000071807Member 2012-09-14 2012-09-14 0000898745 ck0000898745:P0001-S000024296Member ck0000898745:S000024296Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000014240Member ck0000898745:C000092702Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000014240Member ck0000898745:C000038746Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000014240Member ck0000898745:C000038745Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000014240Member ck0000898745:C000038744Member 2012-09-14 2012-09-14 0000898745 ck0000898745:P0001-S000014240Member ck0000898745:S000014240Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007214Member ck0000898745:C000038804Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007214Member ck0000898745:C000019810Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007214Member ck0000898745:C000019809Member 2012-09-14 2012-09-14 0000898745 ck0000898745:P0001-S000007214Member ck0000898745:S000007214Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007075Member ck0000898745:C000092698Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007075Member ck0000898745:C000038781Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007075Member ck0000898745:C000019318Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007075Member ck0000898745:C000019317Member 2012-09-14 2012-09-14 0000898745 ck0000898745:P0001-S000007075Member ck0000898745:S000007075Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007017Member ck0000898745:C000038780Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007017Member ck0000898745:C000019184Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007017Member ck0000898745:C000019177Member 2012-09-14 2012-09-14 0000898745 ck0000898745:P0001-S000007017Member ck0000898745:S000007017Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007015Member ck0000898745:C000092697Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007015Member ck0000898745:C000038778Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007015Member ck0000898745:C000019165Member 2012-09-14 2012-09-14 0000898745 ck0000898745:S000007015Member ck0000898745:C000019162Member 2012-09-14 2012-09-14 0000898745 ck0000898745:P0001-S000007015Member ck0000898745:S000007015Member 2012-09-14 2012-09-14 Other 2012-09-14 PRINCIPAL FUNDS INC 0000898745 false 2012-09-14 2012-09-14 2012-02-29 LargeCap Growth Fund   <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">Supplement dated September 14, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">to the Class A, Class B, Class C, and Class P Shares Prospectus <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">for Principal Funds, Inc. <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">dated February 29, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">(as supplemented on March 16, 2012, March 29, 2012, April 9, 2012, April 20, 2012, May 11, 2012, June 15, 2012, July 17, 2012, and July 27, 2012) <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">This supplement updates information currently in the Prospectus. Retain this supplement with the Prospectus. <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;page-break-after:avoid;text-autospace:none">FUND SUMMARIES   Under the Principal Investment Strategies heading, delete the paragraph and substitute:   <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with large market capitalizations (those with market capitalizations similar to companies in the Russell 1000 ® Growth Index (as of December 31, 2011, this range was between approximately $117 million and $401.25 billion)) at the time of purchase. The Fund invests in growth equity securities; growth orientation emphasizes buying equity securities of companies whose potential for growth of capital and earnings is expected to be above average.   PRGBX PRGWX PLGCX PGLPX LargeCap Value Fund   <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">Supplement dated September 14, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">to the Class A, Class B, Class C, and Class P Shares Prospectus <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">for Principal Funds, Inc. <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">dated February 29, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">(as supplemented on March 16, 2012, March 29, 2012, April 9, 2012, April 20, 2012, May 11, 2012, June 15, 2012, July 17, 2012, and July 27, 2012) <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">This supplement updates information currently in the Prospectus. Retain this supplement with the Prospectus. <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;page-break-after:avoid;text-autospace:none">FUND SUMMARIES   Under the Principal Investment Strategies heading, delete the paragraph and substitute:   <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with large market capitalizations (those with market capitalizations similar to companies in the Russell 1000 ® Value Index, which as of December 31, 2011 ranged between approximately $117 million and $401.25 billion) at the time of purchase. The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued. The Fund may actively trade portfolio securities   PCCBX PCACX PLUCX MidCap Blend Fund   <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">Supplement dated September 14, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">to the Class A, Class B, Class C, and Class P Shares Prospectus <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">for Principal Funds, Inc. <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">dated February 29, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">(as supplemented on March 16, 2012, March 29, 2012, April 9, 2012, April 20, 2012, May 11, 2012, June 15, 2012, July 17, 2012, and July 27, 2012) <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">This supplement updates information currently in the Prospectus. Retain this supplement with the Prospectus. <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;page-break-after:avoid;text-autospace:none">FUND SUMMARIES   Under the Principal Investment Strategies heading, delete the first paragraph and substitute:   <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with medium market capitalizations (those with market capitalizations similar to companies in the Russell Midcap ® Index (as of December 31, 2011, this range was between approximately $117 million and $20.51 billion) at the time of purchase. The Fund may invest in foreign securities.   PEMGX PRMBX PMBCX PMCPX SmallCap Blend Fund   <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">Supplement dated September 14, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">to the Class A, Class B, Class C, and Class P Shares Prospectus <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">for Principal Funds, Inc. <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">dated February 29, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">(as supplemented on March 16, 2012, March 29, 2012, April 9, 2012, April 20, 2012, May 11, 2012, June 15, 2012, July 17, 2012, and July 27, 2012) <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">This supplement updates information currently in the Prospectus. Retain this supplement with the Prospectus. <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;page-break-after:avoid;text-autospace:none">FUND SUMMARIES   Under the Principal Investment Strategies heading, delete the first paragraph and substitute:   <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with small market capitalizations (those with market capitalizations similar to companies in the Russell 2000 ® Index (as of December 31, 2011, this range was between approximately $20 million and $3.7 billion)) at the time of purchase.   PLLAX PLLBX PSMCX Equity Income Fund   <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">Supplement dated September 14, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">to the Class A, Class B, Class C, and Class P Shares Prospectus <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">for Principal Funds, Inc. <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">dated February 29, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">(as supplemented on March 16, 2012, March 29, 2012, April 9, 2012, April 20, 2012, May 11, 2012, June 15, 2012, July 17, 2012, and July 27, 2012) <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">This supplement updates information currently in the Prospectus. Retain this supplement with the Prospectus. <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;page-break-after:avoid;text-autospace:none">FUND SUMMARIES   Under the Principal Investment Strategies heading, delete the paragraph and substitute:   <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in dividend-paying equity securities. The Fund usually invests in equity securities of companies with large market capitalizations (those included in the S&P 500 Index, which as of December 31, 2011 ranged between $1.57 billion and $401.25 billion), but may also invest in equity securities of companies with medium market capitalizations (those included in the Russell Midcap ® Index, which as of December 31, 2011 ranged between $117 million and $20.51 billion). The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued. The Fund will also invest in real estate investment trusts and securities of foreign issuers.   PQIAX PQUBX PEUCX PEQPX Global Diversified Income Fund   <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">Supplement dated September 14, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">to the Class A, Class B, Class C, and Class P Shares Prospectus <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">for Principal Funds, Inc. <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">dated February 29, 2012 <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">  <p class="MsoNormal" align="center" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt; text-align:center;line-height:normal;text-autospace:none">(as supplemented on March 16, 2012, March 29, 2012, April 9, 2012, April 20, 2012, May 11, 2012, June 15, 2012, July 17, 2012, and July 27, 2012) <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">This supplement updates information currently in the Prospectus. Retain this supplement with the Prospectus. <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">  <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;page-break-after:avoid;text-autospace:none">FUND SUMMARIES <p class="MsoNormal" style="font-size:11.0pt;font-family:'calibri','sans-serif';margin-top:9.0pt;margin-right:0in;margin-bottom:0in; margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace:none">On September 11, 2012, the Board of Directors of Principal Funds, Inc. approved the hiring of Post Advisory Group, Inc. (“Post”) as sub-advisor for the Global Diversified Income Fund. The proposal to hire Post will be submitted for shareholder vote at a Special Meeting of Shareholders of Global Diversified Income Fund tentatively scheduled for December 11, 2012. Additional information about this proposal will be provided in the Proxy Statement that is expected to be mailed to record date shareholders of Global Diversified Income Fund in October 2012. If shareholders approve this proposal, Post is expected to begin managing Global Diversified Income Fund assets in January 2013.   Under the Principal Investment Strategies heading, delete the fourth paragraph and substitute:   <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">The Fund may also write (or sell) 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.   <p class="MsoNormal" style="font-size:11.0pt;font-family:'calibri','sans-serif';margin-top:8.0pt;margin-right:0in;margin-bottom:0in; margin-left:0in;margin-bottom:.0001pt;line-height:normal;text-autospace:none">Under the Principal Investment Strategies heading, delete the fifth paragraph and substitute:   <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">A portion of the Fund's assets may be 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. "High yield" securities are commonly known as "junk bonds" and are rated at the time of purchase Ba1 or lower by Moody's Investor Service, Inc. ("Moody's") or BB+ or lower by Standard & Poor's Rating Service ("S&P"). 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.   Under the Principal Risks heading, add:   <p class="MsoNormal" style="margin-top:0in;margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:'calibri','sans-serif';margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;text-autospace:none">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.   PGBAX PGDCX PGDPX