September 22, 2026
VIA EDGAR
Filing Desk
Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549
Re: Calamos ETF Trust (the “Trust”) (File Nos. 33-191151 and 811-22887)
Ladies and Gentlemen:
On behalf of the Trust, and pursuant to the Securities Act of 1933, as amended (the “Securities Act”), and Rule 497(j) thereunder, we hereby represent that the definitive forms of the Trust’s Prospectus and Statement of Additional Information related to its series, Calamos Timpani Active SMID Growth ETF, that would have been filed pursuant to the requirements of Rule 497(c) under the Securities Act, would not have differed from the one contained in the Trust’s Post-Effective Amendment No. 87 to its Registration Statement on Form N-1A, which was filed electronically with the Securities and Exchange Commission pursuant to Rule 485(b) under the Securities Act on June 18, 2026.
If you have any questions concerning this filing, please call me at 630-245-1105.
| Sincerely, | |
| /s/ Susan L. Schoenberger | |
| Susan L. Schoenberger, Esq. | |
| Assistant Secretary of the Trust |
| cc: | John P. Calamos, Sr. |
| Erik D. Ojala, Esq. | |
| Paulita Pike, Esq., Ropes & Gray LLP | |
| Rita Rubin, Esq., Ropes & Gray LLP | |
| Lawrence Zmerega, Esq., Ropes & Gray LLP |