As filed with the Securities and Exchange Commission on June 4, 2026.

1933 Act Registration No. 333-146827

1940 Act Registration No. 811-22135

United States

Securities and Exchange Commission

Washington, D.C. 20549

Form N-1A

Innovator ETFs^® Trust

(Exact name of registrant as specified in charter)

200 W. Front Street

Wheaton, Illinois 60187

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, including Area Code: (800) 208-5212

Corporation Service Company

251 Little Falls Drive

Wilmington, DE 19808

(Name and Address of Agent for Service)

Copies to:

Stephen H. Bier, Esq.

Allison M. Fumai, Esq.

Dechert LLP

1095 Avenue of the Americas

New York, NY 10036

It is proposed that this filing will become effective (check appropriate box):

If appropriate, check the following box:

Contents of Post-Effective Amendment No. 1870

This Post-Effective Amendment to the Registration Statement comprises the following papers and contents:

The Facing Sheet

The sole purpose of this filing is to delay the effectiveness of the Registrant’s Post-Effective Amendment No. 1357, as it relates to Innovator Bitcoin 10 Buffer ETF™ – Quarterly (the “Fund”), a series of the Registrant, until July 2, 2026. Parts A, B and C of the Registrant’s Post-Effective Amendment No. 1357, filed on November 22, 2024, are incorporated by reference herein.

Signatures

Signatures

Pursuant to the requirements of the Securities Act of 1933, as amended (the “Securities Act”) and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act and has duly caused this Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City and State of New York, on June 4, 2026.

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