September 26, 2012
Securities and Exchange Commission
Via EDGAR
Re: Principal Funds, Inc.
File Nos. 033-59474, 811-07572
Interactive data files for previous 497 filing
Pursuant to Rule 497 under the Securities Act of 1933, as amended, Principal Funds, Inc. (“the Registrant”) is filing interactive data files that relate to the supplement the Registrant filed on September 14, 2012 (SEC Accession No. 0000898745-12-000612) and now is incorporating by reference.
Exhibit No. Exhibits
Ex-101.INS XBRL Instance Document
Ex-101.SCH XBRL Taxonomy Extension Schema Document
Ex-101.CAL XBRL Taxonomy Extension Calculations Linkbase Document
Ex-101.DEF XBRL Taxonomy Extension Definition Linkbase Document
Ex-101.LAB XBRL Taxonomy Extension Labels Linkbase Document
Ex-101.PRE XBRL Taxonomy Extension Presentation Linkbase Document