497 1 etfprospsupp121517.htm 497 - PROSP SUPP Document


Principal Exchange-Traded Funds

Supplement dated December 15, 2017
to the Statutory Prospectus dated November 1, 2017


This supplement updates information currently in the Statutory Prospectus. Please retain this supplement for future reference.


ADDITIONAL INFORMATION ABOUT INVESTMENT STRATEGIES AND RISKS

Delete the first paragraph under Preferred Securities and replace with the following:
Preferred securities include preferred stock and various types of subordinated debt and convertible securities. Preferred securities may pay fixed rate or adjustable rate dividends and generally have "preference" over common stock in the payment of dividends, but are junior to the issuer's senior debt in a liquidation of the issuer’s assets. Preference would mean that a company must pay on its preferred securities before paying on its common stock, and that any claims of the preferred security holder would typically be ahead of common stockholders' claims on assets in a corporate liquidation.



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