Themes ETF Trust

05/13/2026 | Press release | Distributed by Public on 05/13/2026 06:26

Prospectus Certification by Investment Company (Form 497J)

May 13, 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 2X Long CBRS Daily ETF

Leverage Shares 2X Short CBRS Daily ETF

Leverage Shares 2X Long XNDU Daily ETF

Leverage Shares 2X Short XNDU Daily ETF

(collectively, the "Funds")

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 Funds 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. 206 to the Trust's Registration Statement on Form N-1A, filed on May 12, 2026.

If you have any questions or require further information, please contact Karen Aspinall at (949) 629-3928 or [email protected].

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 ● [email protected] ● Practus.com

Themes ETF Trust published this content on May 13, 2026, and is solely responsible for the information contained herein. Distributed via EDGAR on May 13, 2026 at 12:26 UTC. If you believe the information included in the content is inaccurate or outdated and requires editing or removal, please contact us at [email protected]