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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

For the quarterly period ended June 30, 2010

OR

1-16725

(Commission file number)

PRINCIPAL FINANCIAL GROUP, INC.

(Exact name of registrant as specified in its charter)

711 High Street, Des Moines, Iowa 50392

(Address of principal executive offices)

(515) 247-5111

(Registrant’s telephone number, including area code)

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days. Yes x No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes x No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No x

The total number of shares of the registrant’s Common Stock, $0.01 par value, outstanding as of July 28, 2010, was 320,310,476.

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PRINCIPAL FINANCIAL GROUP, INC.

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PART I — FINANCIAL INFORMATION

Item 1. Financial Statements

Principal Financial Group, Inc.

Consolidated Statements of Financial Position

See accompanying notes.

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Principal Financial Group, Inc.

Consolidated Statements of Operations

(Unaudited)

See accompanying notes.

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Principal Financial Group, Inc.

Consolidated Statements of Stockholders’ Equity

(Unaudited)

See accompanying notes.

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Principal Financial Group, Inc.

Consolidated Statements of Cash Flows

(Unaudited)

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Principal Financial Group, Inc.
Consolidated Statements of Cash Flows — (continued)

(Unaudited)

See accompanying notes.

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Principal Financial Group, Inc.

Notes to Consolidated Financial Statements

June 30, 2010

(Unaudited)

1. Nature of Operations and Significant Accounting Policies

Basis of Presentation

The accompanying unaudited consolidated financial statements of Principal Financial Group, Inc. (“PFG”), its majority-owned subsidiaries and its consolidated variable interest entities (“VIEs”), have been prepared in conformity with accounting principles generally accepted in the U.S. (“U.S. GAAP”) for interim financial statements and with the instructions to Form 10-Q and Article 10 of Regulation S-X. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three and six months ended June 30, 2010, are not necessarily indicative of the results that may be expected for the year ended December 31, 2010. These interim unaudited consolidated financial statements should be read in conjunction with our annual audited financial statements as of December 31, 2009, included in our Form 10-K for the year ended December 31, 2009, filed with the United States Securities and Exchange Commission (“SEC”). The accompanying consolidated statement of financial position as of December 31, 2009, has been derived from the audited consolidated statement of financial position but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements.

Recent Accounting Pronouncements

In July 2010, the Financial Accounting Standards Board (“FASB”) issued authoritative guidance that requires new and expanded disclosures related to the credit quality of financing receivables and the allowance for credit losses. Reporting entities are required to provide qualitative and quantitative disclosures on the allowance for credit losses, credit quality, impaired loans, modifications and nonaccrual and past due financing receivables. The disclosures are required to be presented on a disaggregated basis by portfolio segment and class of financing receivable. Disclosures required by the guidance that relate to the end of a reporting period will be effective for us in the December 31, 2010, consolidated financial statements. Disclosures required by the guidance that relate to an activity that occurs during a reporting period will be effective for us on January 1, 2011. We do not anticipate this guidance will have a material impact on our consolidated financial statements.

In April 2010, the FASB issued authoritative guidance addressing how investments held through the separate accounts of an insurance entity affect the entity’s consolidation analysis. This guidance clarifies that an insurance entity should not consider any separate account interests held for the benefit of policyholders in an investment to be the insurer’s interests and should not combine those interests with its general account interest in the same investment when assessing the investment for consolidation. This guidance will be effective for us on January 1, 2011, and will not have a material impact on our consolidated financial statements.

In March 2010, the FASB issued authoritative guidance that amends and clarifies the guidance on evaluation of credit derivatives embedded in beneficial interests in securitized financial assets, including asset-backed securities, credit-linked notes, collateralized loan obligations and collateralized debt obligations (“CDOs”). This guidance eliminates the scope exception for bifurcation of embedded credit derivatives in interests in securitized financial assets, unless they are created solely by subordination of one financial instrument to another. This guidance will be effective for us on July 1, 2010. Upon adoption of the guidance, we will elect the fair value option for our fixed maturities within the scope of this guidance, effectively reclassifying them from available-for-sale to trading, and will record a cumulative effect adjustment for the amount of unrealized gains or losses on these fixed maturities, net of tax and deferred policy acquisition costs (“DPAC”). We expect the cumulative change in accounting principle to result in a net $25.4 million decrease to retained earnings, with a corresponding increase to accumulated other comprehensive income.

In January 2010, the FASB issued authoritative guidance that requires new disclosures related to fair value measurements and clarifies existing disclosure requirements about the level of disaggregation, inputs and valuation techniques. Specifically, reporting entities now must disclose separately the amounts of significant transfers in and out of Level 1 and Level 2 fair value measurements and describe the reasons for the transfers. In addition, in the reconciliation for Level 3 fair value measurements, a reporting entity should present separately information about purchases, sales, issuances and settlements. The guidance clarifies that a reporting entity needs to use judgment in determining the appropriate classes of assets and liabilities for disclosure of fair value measurement, considering the level of disaggregated information required by other applicable U.S. GAAP guidance and should also provide disclosures about the valuation techniques and inputs used to measure fair value for each class of assets and liabilities. This guidance was effective for us on January 1, 2010, except for the disclosures about purchases, sales, issuances and settlements in the reconciliation for Level 3 fair value measurements, which will be effective for us on January 1, 2011. This guidance will not have a material impact on our consolidated financial statements.

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Principal Financial Group, Inc.
Notes to Consolidated Financial Statements — (continued)
June 30, 2010
(Unaudited)

1. Nature of Operations and Significant Accounting Policies — (continued)

In June 2009, the FASB issued authoritative guidance to improve the relevance, representational faithfulness and comparability of the information that a reporting entity provides in its financial reports about a transfer of financial assets; the effects of a transfer on its financial position, financial performance and cash flows; and a transferor’s continuing involvement in transferred financial assets. The most significant change is the elimination of the concept of a qualifying special-purpose entity (“QSPE”). Therefore, former QSPEs, as defined under previous accounting standards, should be evaluated for consolidation by reporting entities on and after the effective date in accordance with the applicable consolidation guidance. This guidance was effective for us on January 1, 2010, and did not have a material impact on our consolidated financial statements.

Also in June 2009, the FASB issued authoritative guidance related to the accounting for VIEs, which amends prior guidance and requires an enterprise to perform an analysis to determine whether the enterprise’s variable interest or interests give it a controlling financial interest in a VIE. This analysis identifies the primary beneficiary of a VIE as the enterprise with (1) the power to direct the activities of a VIE that most significantly impact the entity’s economic performance and (2) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. In addition, this guidance requires ongoing reassessments of whether an enterprise is the primary beneficiary of a VIE. Furthermore, we are required to enhance disclosures that will provide users of financial statements with more transparent information about an enterprise’s involvement in a VIE. The enhanced disclosures are required for any enterprise that holds a variable interest in a VIE. We adopted this guidance prospectively effective January 1, 2010. Due to the implementation of this guidance, certain previously unconsolidated VIEs were consolidated and certain previously consolidated VIEs were deconsolidated. The cumulative change in accounting principle from adopting this guidance resulted in a net $10.7 million decrease to retained earnings and a net $10.7 million increase to accumulated other comprehensive income. In February 2010, the FASB issued an amendment to this guidance. The amendment indefinitely defers the consolidation requirements for reporting enterprises’ interests in entities that have the characteristics of investment companies and regulated money market funds. This amendment was effective January 1, 2010, and did not have a material impact to our consolidated financial statements. The required disclosures are included in our consolidated financial statements. See Note 2, Variable Interest Entities, for further details.

Separate Accounts

At June 30, 2010 and December 31, 2009, the separate accounts include a separate account valued at $170.8 million and $191.5 million, respectively, which primarily includes shares of our stock that were allocated and issued to eligible participants of qualified employee benefit plans administered by us as part of the policy credits issued under our 2001 demutualization. These shares are included in both basic and diluted earnings per share calculations. In the consolidated statements of financial position, the separate account shares are recorded at fair value and are reported as separate account assets with a corresponding separate account liability to eligible participants of the qualified plan. Changes in fair value of the separate account shares are reflected in both the separate account assets and separate account liabilities and do not impact our results of operations.

2. Variable Interest Entities

We have relationships with and may have a variable interest in various types of special purpose entities. Following is a discussion of our interest in entities that meet the definition of a VIE. When we are the primary beneficiary we are required to consolidate the entity in our financial statements. On January 1, 2010, we adopted authoritative guidance that changed the method of determining the primary beneficiary of a VIE. Prior to January 1, 2010, the primary beneficiary was the enterprise who absorbed the majority of the entity’s expected losses, received a majority of the expected residual returns or both. The new guidance identifies the primary beneficiary of a VIE as the enterprise with (1) the power to direct the activities of a VIE that most significantly impact the entity’s economic performance and (2) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. The guidance also requires ongoing assessment of whether we are the primary beneficiary of a VIE. See further discussion of the adoption in Note 1, Nature of Operations and Significant Accounting Policies.

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Principal Financial Group, Inc.
Notes to Consolidated Financial Statements — (continued)
June 30, 2010
(Unaudited)

2. Variable Interest Entities — (continued)

Consolidated Variable Interest Entities

Grantor Trusts

We contributed undated subordinated floating rate notes to three grantor trusts. The trusts separated the cash flows by issuing an interest-only certificate and a residual certificate related to each note contributed. Each interest-only certificate entitles the holder to interest on the stated note for a specified term, while the residual certificate entitles the holder to interest payments subsequent to the term of the interest-only certificate and to all principal payments. We retained the interest-only certificates and the residual certificates were subsequently sold to third parties.

We have determined these grantor trusts are VIEs due to insufficient equity to sustain them. As our interest-only certificates are exposed to the majority of the risk of loss due to interest rate risk, we determined we were the primary beneficiary prior to January 1, 2010. Beginning January 1, 2010, we determined we remain the primary beneficiary as a result of our contribution of securities into the trusts.

Collateralized Private Investment Vehicles

We invest in synthetic CDOs, collateralized bond obligations, collateralized loan obligations, collateralized commodity obligations and other collateralized structures, which are VIEs due to insufficient equity to sustain the entities (collectively known as “collateralized private investment vehicles”). The performance of the notes of these structures is primarily linked to a synthetic portfolio by derivatives; each note has a specific loss attachment and detachment point. The notes and related derivatives are collateralized by a pool of permitted investments. The investments are held by a trustee and can only be liquidated to settle obligations of the trusts. These obligations primarily include derivatives, financial guarantees and the notes due at maturity or termination of the trusts.

Prior to January 1, 2010, we determined we were the primary beneficiary of a certain number of these entities due to the nature of our direct investment in the VIEs. As of December 31, 2009, we consolidated five collateralized private investment vehicles with assets of $135.7 million. Upon adoption of the new accounting guidance as of January 1, 2010, we determined we were no longer the primary beneficiary of three of these entities with assets of $65.4 million. For these three entities, we do not control the decisions affecting the economic performance of the entities and we were not involved with the design of the entities. As of June 30, 2010, we continue to hold $53.8 million of investments in these entities classified on the consolidated statements of financial position as fixed maturities, available-for-sale or fixed maturities, trading. We also determined we are the primary beneficiary of two additional collateralized private investment vehicles. For all the collateralized structures consolidated as of June 30, 2010, we are the primary beneficiary because we act as the investment manager of the underlying portfolio and we have an ownership interest.

Commercial Mortgage-Backed Securities

In September 2000, we sold commercial mortgage loans to a real estate mortgage investment conduit trust. The trust issued various commercial mortgage-backed securities (“CMBS”) certificates using the cash flows of the underlying commercial mortgages it purchased. Prior to January 1, 2010, this entity was scoped out of the consolidation guidance as a QSPE. Based on the new accounting guidance, the previous scope exception for QSPEs no longer exists and this entity is now a VIE due to the entity having insufficient equity to sustain itself. We have determined we are the primary beneficiary as we retained the special servicing role for the assets within the trust as well as the ownership of the bond class which controls the unilateral kick out rights of the special servicer.

Hedge Funds

We are a general partner with an insignificant equity ownership in various hedge funds. These entities are deemed VIEs due to the equity owners not having decision-making ability. Before January 1, 2010, we consolidated these VIEs due to our related parties’ ownership. Beginning January 1, 2010, we continue to consolidate these entities due to our control through our management relationship, related party ownership and our fee structure in certain of these funds. These entities contain various fixed maturities held as available-for-sale and trading and equity securities held as trading.

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Principal Financial Group, Inc.
Notes to Consolidated Financial Statements — (continued)
June 30, 2010
(Unaudited)

2. Variable Interest Entities — (continued)

The carrying amounts of our consolidated VIE assets, which can only be used to settle obligations of consolidated VIEs, and liabilities of consolidated VIEs for which creditors do not have recourse are as follows:

(1)   Grantor trusts contain an embedded derivative of a forecasted transaction to deliver the underlying securities; collateralized private investment vehicles include derivative liabilities, financial guarantees and obligation to redeem notes at maturity or termination of the trust; CMBS includes obligation to the bondholders; and hedge funds include liabilities to securities brokers.

(2)   The consolidated statements of financial position included a $131.8 million noncontrolling interest for hedge funds.

We did not provide financial or other support to investees designated as VIEs during the three or six months ended June 30, 2010.

Unconsolidated Variable Interest Entities

We hold a significant variable interest in a number of VIEs where we are not the primary beneficiary. Our investments in securities issued by these VIEs are reported in fixed maturities, available-for-sale and fixed maturities, trading in the consolidated statements of financial position and are described below.

VIEs include CMBS, residential mortgage-backed securities and asset-backed securities. All of these entities were deemed VIEs upon the removal of the QSPE scope exception because the equity within these entities is insufficient to sustain them. We currently are not the primary beneficiary in any of the entities within these categories of investments. This determination was based primarily on the fact we do not own the class of security that controls the unilateral right to replace the special servicer or equivalent function.

As previously discussed, we invest in several types of collateralized private investment vehicles, which are VIEs. These include cash and synthetic structures that we do not manage. We are currently not the primary beneficiary of these collateralized private investment vehicles primarily because we do not control the economic performance of the entities and were not involved with the design of the entities.

We have invested in various VIE trusts as a debt holder. All of these entities are classified as VIEs due to insufficient equity to sustain them. Prior to January 1, 2010, we had performed a quantitative analysis and concluded that although we held a significant variable interest in these entities we were not the primary beneficiary due to lack of majority of the risk of loss or because they were scoped out as a QSPE. Beginning January 1, 2010, we concluded we are not the primary beneficiary primarily because we do not control the economic performance of the entities and were not involved with the design of the entities.

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Principal Financial Group, Inc.
Notes to Consolidated Financial Statements — (continued)
June 30, 2010
(Unaudited)

2. Variable Interest Entities — (continued)

The carrying value and maximum loss exposure for our unconsolidated VIEs are as follows: