As Filed with the U.S. Securities and Exchange Commission on March 3, 2020

1933 Act File No. 333-221045

1940 Act File No. 811-23305

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549
__________________
FORM N-1A
__________________
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	☐
Post-Effective Amendment No. 50	x
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 52	x
(Check appropriate box or boxes.)
__________________
American Century ETF Trust
__________________
4500 MAIN STREET, KANSAS CITY, MISSOURI 64111   (Address of Principal Executive Offices)                  (Zip Code)
REGISTRANT’S TELEPHONE NUMBER, INCLUDING AREA CODE: (816) 531-5575
CHARLES A. ETHERINGTON 4500 MAIN STREET, KANSAS CITY, MISSOURI 64111 (Name and Address of Agent for Service)
It is proposed that this filing will become effective (check appropriate box)

x	immediately upon filing pursuant to paragraph (b)
☐	on (date) pursuant to paragraph (b)
☐	60 days after filing pursuant to paragraph (a)(1)
☐	on (date) pursuant to paragraph (a)(1)
☐	75 days after filing pursuant to paragraph (a)(2)
☐	on (date) pursuant to paragraph (a)(2) of rule 485
If appropriate, check the following box:
☐	this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement amendment pursuant to Rule 485(b) promulgated under the Securities Act of 1933, as amended, and has duly caused this amendment to be signed on its behalf by the undersigned, duly authorized, in the City of Kansas City, State of Missouri on the 3rd day of March, 2020.

	American Century ETF Trust
By:	* _________________________________
	Patrick Bannigan
	President

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

SIGNATURES	TITLE	DATE
* _____________________________	President	March 3, 2020
Patrick Bannigan
* _____________________________	Chief Financial Officer and Treasurer	March 3, 2020
R. Wes Campbell
* _____________________________	Chairman and Trustee	March 3, 2020
Reginald M. Browne
* _____________________________	Trustee	March 3, 2020
Ronald J. Gilson
* _____________________________	Trustee	March 3, 2020
Barry A. Mendelson
* _____________________________	Trustee	March 3, 2020
Jonathan S. Thomas
* _____________________________	Trustee	March 3, 2020
Stephen E. Yates

*By:	/s/ Ashley L. Bergus
	Ashley L. Bergus
	Attorney in Fact

Pursuant to Power of Attorney, dated August 23, 2019 (filed electronically as Exhibit q1 to Post-Effective Amendment No. 25 to the Registration Statement of American Century ETF Trust on August 29, 2019, File No. 333-221045, and incorporated herein by reference).

Secretary’s Certificate, dated August 23, 2019 (filed electronically as Exhibit q2 to Post-Effective Amendment No. 25 to the Registration Statement of American Century ETF Trust on August 29, 2019, File No. 333-221045, and incorporated herein by reference).

EXHIBIT INDEX

EXHIBIT NUMBER	DESCRIPTION OF DOCUMENT
Exhibit - 101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
Exhibit - 101.INS	XBRL Instance Document
Exhibit - 101.SCH	XBRL Taxonomy Extension Schema Document
Exhibit - 101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
Exhibit - 101.LAB	XBRL Taxonomy Extension Label Linkbase Document
Exhibit - 101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document