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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: January 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 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 assets under management by asset manager and presented again in such format 
within the Company's financial supplement for the quarter ended December 31, 2009 
when that document is posted to the Company's investor relations web site on or about 
February 8, 2010. 
 
            As of December 31, 2009, the assets under management by asset manager were 
$205.3 billion for Principal Global Investors and $31.3 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: January 22, 2010