Principal International Equity ETF Class Principal International Equity ETF Class ,C000254970 Principal Finisterre Emerging Markets Diversified Income ETF Principal Finisterre Emerging Markets Diversified Income ETF , S000106066 Deflation Risk Member Deflation Risk Member Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deductions for fees, expenses or taxes) Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deductions for fees, expenses or taxes) Principal Focused Blue Chip ETF Class Principal Focused Blue Chip ETF, C000243208 Principal CLO ETF Class Principal CLO ETF Class, C000273533 Bank Loan Risk Member Bank Loan Risk Member Principal Investment Grade Corporate ETF Series Principal Investment Grade Corporate ETF, S000061644 FTSE NAREIT All Equity REITs Index (reflects no deductions for fees, expenses or taxes) FTSE NAREIT All Equity REITs Index (reflects no deductions for fees, expenses or taxes) Industry Concentration Risk, Real Estate Member Industry Concentration Risk, Real Estate Member Leverage Risk Member Leverage Risk Member Preferred Securities Risk Member Preferred Securities Risk Member Russell 3000 Index (reflects no deductions for fees, expenses, or taxes) Russell 3000 Index (reflects no deductions for fees, expenses, or taxes) High Yield Securities Risk Member High Yield Securities Risk Member Derivatives Risk, Currency Contracts Member Derivatives Risk, Currency Contracts Member Real Estate Securities Risk Member Real Estate Securities Risk Member Principal Securitized Debt ETF Class Principal Securitized Debt ETF Class, C000273536 Real Estate Investment Trust ("REITs") Risk Member Real Estate Investment Trust ("REITs") Risk Member CLO Manager Risk Member CLO Manager Risk Member U.S. Treasury STRIPS Risk Member U.S. Treasury STRIPS Risk Member Principal Securitized Debt ETF Principal Securitized Debt ETF, S000103004 FLEX Options Risk Member FLEX Options Risk Member Principal Value ETF Share Class Principal Value ETF Share Class, C000166475, PY Derivatives Risk, Options Member Derivatives Risk, Options Member Distressed Investments Risk Member Distressed Investments Risk Member Contingent Convertible Securities Risk Member Contingent Convertible Securities Risk Member Principal CLO ETF Principal CLO ETF , S000103001 Principal Capital Appreciation Select ETF Principal Capital Appreciation Select ETF, S000091386 Capital Securities Risk Member Capital Securities Risk Member Bloomberg Global Aggregate Index (reflects no deductions for fees, expenses, or taxes) Bloomberg Global Aggregate Index (reflects no deductions for fees, expenses, or taxes) Principal Active High Yield ETF Class Principal Active Income ETF Class, C000154646, YLD S&P 500 Value Index (reflects no deductions for fees, expenses or taxes) S&P 500 Value Index (reflects no deductions for fees, expenses or taxes) ICE BofA 7% Constrained DRD Eligible Preferred Securities Index (reflects no deductions for fees, expenses, or taxes) ICE BofA 7% Constrained DRD Eligible Preferred Securities Index (reflects no deductions for fees, expenses, or taxes) Liquidity Risk Member Liquidity Risk Member Principal Investment Grade Corporate ETF Class Principal Investment Grade Corporate ETF, C000199630 Fixed-Income Securities Risk Member Fixed-Income Securities Risk Member Principal Active High Yield ETF Principal Active High Yield ETF, S000049047 Equity Securities Risk, Growth Style Risk Member Equity Securities Risk, Growth Style Risk Member U.S. Treasury Securities Risk Member U.S. Treasury Securities Risk Member Portfolio Duration Risk Member Portfolio Duration Risk Member Principal Spectrum Preferred and Income ETF Principal Spectrum Preferred and Income ETF (formerly, Principal Spectrum Tax-Advantaged Dividend Active ETF) Series, S000068805 Emerging Markets Risk, China Investment Risk Member Emerging Markets Risk, China Investment Risk Member Covered Call Risk Member Covered Call Risk Member Principal U.S. Mega-Cap ETF, Share Class Principal U.S. Mega-Cap ETF C000193921Member Industry Concentration Risk, Financial Services Member Industry Concentration Risk, Financial Services Member Sovereign Debt Risk Member Sovereign Debt Risk Member Principal International Equity ETF Principal International Equity ETF, S000088641 Foreign Securities Risk Member Foreign Securities Risk Member Dividend-Oriented Stocks Risk Member Dividend-Oriented Stocks Risk Member Principal U.S. Small Cap ETF Class Principal U.S. Small Cap ETF, C000173454 Principal Growth ETF Principal Growth ETF, S000110501 Principal Long Duration ETF Class Principal Long Duration ETF Class, C000273535 MSCI ACWI Ex USA Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes) MSCI ACWI Ex USA Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes) Principal Long Duration ETF Principal Long Duration ETF, S000103003 Emerging Markets Risk, Frontier Markets Risk Member Emerging Markets Risk, Frontier Markets Risk Member High Portfolio Turnover Risk Member High Portfolio Turnover Risk Member Securitized Products Risk Member Securitized Products Risk Member Active Management Risk Member Active Management Risk Member Russell 2000 Index (reflects no deductions for fees, expenses, or taxes) Russell 2000 Index (reflects no deductions for fees, expenses, or taxes) Redemption And Large Transaction Risk Member Redemption And Large Transaction Risk Member Derivatives Risk, Credit Default Swaps Member Derivatives Risk, Credit Default Swaps Member Equity Securities Risk Member Equity Securities Risk Member Principal Spectrum Preferred and Income ETF Class Principal Spectrum Preferred and Income ETF (formerly, Principal Spectrum Tax-Advantaged Dividend Active ETF) Class, C000219817, PQDI Principal Growth ETF Class Principal Growth ETF Class, C000281758 Tax-Advantaged Strategy Risk Member Tax-Advantaged Strategy Risk Member Bloomberg U.S. Aggregate Index (reflects no deductions for fees, expenses, or taxes) Bloomberg U.S. Aggregate Index (reflects no deductions for fees, expenses, or taxes) Trading Halt Risk Member Trading Halt Risk Member Principal Spectrum Preferred Securities Active ETF Principal Spectrum Preferred Securities Active ETF Derivatives Risk, Futures Risk Member Derivatives Risk, Futures Risk Member Cash Transactions Risk Member Cash Transactions Risk Member Equity Securities Risk, Value Style Risk Member Equity Securities Risk, Value Style Risk Member Foreign Currency Risk Member Foreign Currency Risk Member Principal Capital Appreciation Select ETF Class Principal Capital Appreciation Select ETF Class, C000259043 Principal Inflation Protection ETF Class Principal Inflation Protection ETF Class, C000273534 ICE BofA U.S. Investment Grade Institutional Capital Securities Index (reflects no deductions for fees, expenses, or taxes) ICE BofA U.S. Investment Grade Institutional Capital Securities Index (reflects no deductions for fees, expenses, or taxes) Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member Russell 1000 Index (reflects no deduction for fees, expenses, or taxes) Russell 1000 Index (reflects no deduction for fees, expenses, or taxes) Hedging Risk Member Hedging Risk Member Derivatives Risk, Credit Default Swaps Risk Member Derivatives Risk, Credit Default Swaps Risk Member Information Technology Sector Risk Member Information Technology Sector Risk Member Principal Real Estate Active Opportunities ETF Class Principal Real Estate Active Opportunities ETF Class C000235507 Interest Rate1 Risk Member Interest Rate1 Risk Member U.S. Government Securities Risk Member U.S. Government Securities Risk Member Derivatives Risk Member Derivatives Risk Member CLO Risk Member CLO Risk Member Russell 1000 Growth Index (reflects no deduction for fees, expenses, or taxes) Russell 1000 Growth Index (reflects no deduction for fees, expenses, or taxes) Principal U.S. Mega-Cap ETF Principal U.S. Mega-Cap ETF S000059183Member Treasury Inflation Protected Securities Risk Member Treasury Inflation Protected Securities Risk Member Model Risk Member Model Risk Member Derivatives Risk, Swaps Risk Member Derivatives Risk, Swaps Risk Member Principal Spectrum Preferred Securities Active ETF Class Principal Spectrum Preferred Securities Active ETF Principal Inflation Protection ETF Principal Inflation Protection ETF, S000103002 Market Trading Risks Member Market Trading Risks Member Principal Focused Blue Chip ETF Principal Focused Blue Chip ETF, S000080686 Principal U.S. Small Cap ETF Principal U.S. Small Cap, S000055159, Series Cash Transaction Risk Member Cash Transaction Risk Member Principal Equity Premium Income ETF Class Principal Equity Premium Income ETF Class, C000276895 Principal Equity Premium Income ETF Principal Equity Premium Income ETF ,S000106065 Floating And Variable Rate Securities Risk Member Floating And Variable Rate Securities Risk Member Bloomberg U.S. Corporate Investment Grade Bond Index (reflects no deductions for fees, expenses or taxes) Bloomberg U.S. Corporate Investment Grade Bond Index (reflects no deductions for fees, expenses or taxes) Industry Concentration Risk Member Industry Concentration Risk Member Tracking Basket Structure Risk Member Tracking Basket Structure Risk Member Momentum Style Risk Member Momentum Style Risk Member Equity Securities Risk, Smaller Companies Risk Member Equity Securities Risk, Smaller Companies Risk Member Emerging Markets Risk Member Emerging Markets Risk Member Principal Value ETF Principal Value ETF, S000052930 U.S. Government-Sponsored Securities Risk Member U.S. Government-Sponsored Securities Risk Member S&P 500 Index (reflects no deductions for fees, expenses or taxes) S&P 500 Index (reflects no deductions for fees, expenses or taxes) Distribution Tax Risk Member Distribution Tax Risk Member Principal Real Estate Active Opportunities ETF Principal Real Estate Active Opportunities ETF S000076068 Counterparty Risk Member Counterparty Risk Member