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: July 16, 2008 (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 June 30, 2008 when that document is posted to the Company's investor relations web site on or about August 4, 2008. As of June 30, 2008, the assets under management by asset manager were $233.0 billion for Principal Global Investors and $28.6 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: July 16, 2008