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April 27, 2000
Securities and Exchange Commission
450 Fifth Street, N. W.
Washington, DC 20549
RE: Calamos Advisors Trust (the "Trust") (File Nos. 333-72511 and
811-09237) Post-Effective Amendment No. 1 to Registration
Statement on Form N-1A
Ladies and Gentlemen:
Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, the
Trust hereby certifies that the form of Prospectus and Statement of Additional
Information that would have been filed on behalf of the Trust pursuant to Rule
497(c) upon the effectiveness of the Post-Effective Amendment stated above, to
the Trust's Registration Statement on Form N-1A (the "Amendment") would not have
differed from that contained in the Amendment, which is the most recent
amendment to such Registration Statement and was filed electronically on April
26, 2000.
Comments or questions concerning this certificate may be directed to James
S. Hamman, Jr. at (630) 245-7296.
Sincerely,
Calamos Advisors Trust
By: /s/ James S. Hamman, Jr.
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James S. Hamman, Jr.
Secretary
