Definitive Materials Filed by Investment Companies. (497)

March 27, 2020

Via EDGAR

Securities and Exchange Commission

Re:    Principal Exchange-Traded Funds

File Nos. 333-201935, 811-23029

Interactive data files for previous 497 filing

Principal Exchange-Traded Funds (the “Registrant”) is incorporating by reference the supplement filed on March 20, 2020 (SEC Accession No. 0001572661-20-000068).

Pursuant to Rule 497 under the Securities Act of 1933, as amended, the Registrant is filing interactive data files that relate to Form N-1A items 2-4 in the supplement that the Registrant is incorporating by reference.

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Exhibit No.    Exhibits

Ex-101.INS    XBRL Instance Document

Ex-101.SCH    XBRL Taxonomy Extension Schema Document

Ex-101.CAL    XBRL Taxonomy Extension Calculations Linkbase Document

Ex-101.DEF    XBRL Taxonomy Extension Definition Linkbase Document

Ex-101.LAB    XBRL Taxonomy Extension Label Linkbase Document

Ex-101.PRE    XBRL Taxonomy Extension Presentation Linkbase Document