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Report of Independent Registered Public Accounting FirmDecember 31,20152014AssetsInvestments at fair value:Unallocated investment options:Guaranteed interest accountsSeparate accountsPrincipal Financial Group, Inc. Employee Stock Ownership PlanCollective investment trust—Plan interest in Principal Select Savings Stable
Value Master TrustTotal invested assets at fair valueReceivables:Contributions receivable from employerNotes receivable from participantsTotal receivablesNet assets reflecting investments at fair valueAdjustments from fair value to contract value for a fully
benefit-responsive investment contractNet assets available for benefitsSee accompanying notes.For the year ended
December 31,AdditionsInvestment income:InterestDividendsNet depreciation of investmentsInterest in Principal Select Savings Stable Value Master TrustTotal investment incomeInterest income on notes receivable from participantsContributions:EmployerParticipantsTransfers from affiliated and unaffiliated plans, netTotal contributionsTotal additionsDeductionsBenefits paid to participantsAdministrative expensesTotal deductionsNet increaseNet assets available for benefits at beginning of yearNet assets available for benefits at end of yearPlan TerminationMid-Cap Separate AccountPrincipal Financial Group, Inc. ESOPU.S. Property Separate AccountLarge-Cap Stock Index Separate AccountDiversified International Separate AccountSmall-Cap Stock Index Separate Account*For the year ended December 31,Separate accounts of insurance companyAssets Measured at Fair Value on a Recurring BasisAs of December 31, 2015Assets Measured at Fair ValueFair Value Hierarchy LevelLevel 1Level 2Level 3$—Separate accounts:Fixed-income security–Lifetime balanced asset allocationLarge U.S. equitySmall/mid U.S. equityInternational equityU.S. real estateOtherTotal invested assets, excluding Plan        interest in Master TrustAs of December 31, 2014Changes in Level 3 Fair Value MeasurementsFor the year ended December 31, 2015Changes in Unrealized Gains Included in Changes in Net Assets Available for Benefits Relating to Positions Still HeldBeginning Asset Balance as of
January 1, 2015Interest*Purchases **Sales**Transfers in (Out) of Level 3Ending Asset Balance as of December 31, 2015TotalFor the year ended December 31, 2014Changes in Unrealized Gains Included in Changes in Net Assets Available for Benefits Relating to Positions Still HeldBeginning Asset Balance as of
January 1, 2014Ending Asset Balance as of December 31, 2014Quantitative Information about Level 3 Fair Value MeasurementsAssets Measured at fair valueValuation techniqueUnobservable input descriptionInput/range of inputsSee note (1)Interest rate on account0.10% – 2.40%Applicable interest rate1.10% – 2.43%Maturity date12/31/2015 – 12/31/2021Plan Accounting - Defined Contribution Pension PlansAs of December 31,Average yields:Based on actual earnings1.36%1.05%Based on interest rate credited to participants1.06%6. Interest in Principal Select Savings Stable Value Master Trust (continued)STIFBond FundTotal assetsReceivables (payables)Net assets at fair valueAdjustments from fair value to contract value for fully benefit-responsive investment contractTotal net assets at contract valuePlan interest in Principal Select Savings Stable Value Master Trust at fair valueAdjustment from fair value to contract value for a fully benefit-responsive investment contractPlan interest in Principal Select Savings Stable Value Master Trust at contract valueInterest incomeOther incomeTotal invested assets8. Form 5500Net assets available for benefits per the Statements of Net Assets Available for BenefitsAdjustments from contract value to fair value for fully benefit-responsive investment contractNet assets available for benefits per the Form 5500Net change from contract value to fair value for fully benefit-responsive investment contractsMaster Trust investment incomeNet investment loss from Master Trust investment accounts per the Form 5500Identity of IssueDescription of InvestmentCurrent ValuePrincipal Life Insurance Company*Deposits in insurance company Large-Cap Growth I Separate AccountDeposits in insurance company Lifetime Strategic Income Separate AccountDeposits in insurance company Principal Financial Group, Inc. Stock Separate AccountDeposits in insurance company Small-Cap Growth I Separate AccountDeposits in insurance company Small-Cap Stock Index Separate AccountDeposits in insurance company Equity Income Separate AccountDeposits in insurance company Lifetime 2010 Separate AccountDeposits in insurance company Lifetime 2020 Separate AccountDeposits in insurance company Lifetime 2030 Separate AccountDeposits in insurance company Lifetime 2040 Separate AccountDeposits in insurance company Lifetime 2050 Separate AccountDeposits in insurance company Lifetime 2060 Separate AccountPrincipal Trust Company*Common/Collective Trust Diversified Real Asset Tier 2Principal Financial Group, Inc.*394,575 shares of Principal Financial Group, Inc. ESOPLoans to participants*Notes receivable from participants with varying maturity dates and interest rates ranging from 5.25% to 10.25%* Indicates party-in-interest to the Plan.PK ! Wš‘d¶ ¶ docProps/app.xml
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