As filed with the Securities and Exchange Commission on October 22, 2025

Securities Act Registration No. 333-234544

Investment Company Act Registration No. 811-23439

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

and/or

ETF OPPORTUNITIES TRUST

(Exact Name of Registrant as Specified in Charter)

Karen Shupe
Commonwealth Fund Services, Inc.
8730 Stony Point Parkway, Suite 205
Richmond, VA 23235
(804) 267-7400

(Address and Telephone Number of Principal Executive Offices)

 The Corporation Trust Co.

Corporation Trust Center
1209 Orange St.
Wilmington, DE 19801

(Name and Address of Agent for Service)

With Copy to:

John H. Lively

 Practus, LLP

11300 Tomahawk Creek Parkway, Suite 310

Leawood, KS 66211

It is proposed that this filing will become effective:

If appropriate, check the following box:

This filing relates solely to the following fund, a series of ETF Opportunities Trust: T-REX 2X Long TRON Daily Target ETF

This Post-Effective Amendment to the Registration Statement on Form N-1A is filed pursuant to Rule 485(b)(1)(iii) for the sole purpose of designating November 21, 2025 as the new effective date for Post-Effective Amendment No. 308 to the Registration Statement filed on July 10, 2025 for the T-REX 2X Long TRON Daily Target ETF. This Post-Effective Amendment incorporates by reference the Prospectus and Statement of Additional Information contained in Post-Effective Amendment No. 308 to the Registration Statement. This Post-Effective Amendment incorporates by reference the Part C contained in Post-Effective Amendment No. 395 to the Registration Statement.

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) of the Securities Act and  has duly caused this Post-Effective Amendment No. 428 to the Registrant’s Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Richmond, Commonwealth of Virginia on the 22nd day of October, 2025.

Pursuant to the requirements of the Securities Act, this Post-Effective Amendment No. 428 to the Registration Statement on Form N-1A has been signed below by the following persons in the capacities and on the dates indicated.

*Attorney-in-fact pursuant to Powers of Attorney