Principal Financial Services, Inc. 711 High Street, Des Moines, IA 50392 www.principal.com

October 10, 2017

Mr. Mike Beer

Chief Executive Officer and President

Principal Exchange-Traded Funds

Principal Financial Group

Des Moines, IA 50392

Dear Mr. Beer:

Principal Financial Services, Inc. intends to purchase the following shares (the “Shares”):

Principal Exchange-Traded Funds	Purchase Amount	Shares Purchased
Principal U.S. Mega-Cap Multi-Factor Index ETF	$25.00	1

Each share of the Principal Exchange-Traded Funds has no par value and a price of $25 per share. In connection with such purchases, Principal Financial Services, Inc. represents and warrants that it will purchase such Shares as an investment and not with a view to resell, distribute or redeem.

PRINCIPAL FINANCIAL SERVICES, INC.
BY	/s/ Clint Woods
	Clint Woods
	Vice President and Associate General Counsel