July 24, 2026

VIA EDGAR TRANSMISSION

U.S. Securities and Exchange Commission

Division of Investment Management

100 F Street, NE

Washington, DC 20549

Re:

Themes ETF Trust (the “Trust”)

File Nos.: 333-271700 and 811-23872

Leverage Shares 100% TSLA and 100% SPCX Daily ETF (the “Fund”)

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, and the regulations thereunder, the Trust, on behalf of the Fund, hereby certifies that the form of Prospectus and Statement of Additional Information that would have been filed under Rule 497(b) or (c) would not have differed from those contained in Post-Effective Amendment No. 320 to the Trust’s Registration Statement on Form N-1A, as filed on July 23, 2026.

If you have any questions or require further information, please contact Karen Aspinall at (949) 629-3928 or Karen.Aspinall@Practus.com.

Sincerely,

/s/ Karen Aspinall
Karen Aspinall

KAREN A. ASPINALL ● PARTNER

11300 Tomahawk Creek Pkwy ● Ste. 310 ● Leawood, KS 66211 ● p: 949.629.3928

Practus, LLP ● Karen.Aspinall@Practus.com ● Practus.com