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SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549
_________________________
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934
Date of Report: April 22, 2010
(Date of earliest event reported)
 
PRINCIPAL FINANCIAL GROUP, INC.
(Exact name of registrant as specified in its charter)

                                                Delaware                  1-16725            42-1520346 
                                          (State or other jurisdiction        (Commission file number)         (I.R.S. Employer 
                                         of incorporation)      Identification Number) 

711 High Street, Des Moines, Iowa 50392
(Address of principal executive offices)
 
(515) 247-5111
(Registrant’s telephone number, including area code)
 
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing 
obligation of the registrant under any of the following provisions: 
 
    [    ]  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) 
    [    ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) 
    [    ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 
  240.14d-2(b)) 
    [    ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 
  240.13e-4(c)) 
_________________________



Item 7.01       Regulation FD Disclosure 
 
            This report is filed quarterly to disclose assets under management (“AUM”) by 
asset manager, prior to the availability of Principal Financial Group, Inc's (the 
“Company”) quarterly earnings release. The amounts presented herein will be consistent 
with the format of AUM by asset manager and presented again in such format within the 
Company's financial supplement for the quarter ended March 31, 2010 when that 
document is posted to the Company's investor relations web site on or about May 3, 
2010. AUM may include assets managed directly and pursuant to dual employment 
agreements among affiliated companies. 
 
            As of March 31, 2010, the AUM by asset manager were $211.5 billion for 
Principal Global Investors and $33.5 billion for Principal International. 
 
 
 
 
                                                        SIGNATURE
 
            Pursuant to the requirements of the Securities Exchange Act of 1934, the 
registrant has duly caused this report to be signed on its behalf by the undersigned 
thereunto duly authorized. 

                                                PRINCIPAL FINANCIAL GROUP, INC. 
 
 
                                                By:           /s/ Thomas J. Graf                        
                                                Name:  Thomas J. Graf 
                                                Title:     Senior Vice President – Investor 
                                                            Relations 
 
 
 
Date:  April 22, 2010