<SEC-DOCUMENT>0001104659-21-087681.txt : 20210630
<SEC-HEADER>0001104659-21-087681.hdr.sgml : 20210630
<ACCEPTANCE-DATETIME>20210630171318
ACCESSION NUMBER:		0001104659-21-087681
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20210630
DATE AS OF CHANGE:		20210630
EFFECTIVENESS DATE:		20210630

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CALAMOS STRATEGIC TOTAL RETURN FUND
		CENTRAL INDEX KEY:			0001275214
		IRS NUMBER:				043785941
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-255673
		FILM NUMBER:		211062757

	BUSINESS ADDRESS:	
		STREET 1:		2020 CALAMOS COURT
		STREET 2:		C/O CALAMOS ADVISORS LLC
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60653
		BUSINESS PHONE:		6302451046

	MAIL ADDRESS:	
		STREET 1:		2020 CALAMOS COURT
		STREET 2:		C/O CALAMOS ADVISORS LLC
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60653
</SEC-HEADER>
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<TYPE>497
<SEQUENCE>1
<FILENAME>tm2120933d4_497.htm
<DESCRIPTION>497
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<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-variant: small-caps"><B>Calamos
Strategic Total Return Fund</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Supplement dated June&nbsp;30, 2021 to the</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Statement of Additional Information,</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>dated April&nbsp;30, 2021</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>Effective immediately, Daniel Dufresne is added as Vice President
of Calamos Strategic Total Return Fund. The section titled &ldquo;Management&mdash;Officers&rdquo; in the Statement of Additional Information
is hereby amended to include the following information about the new officer:</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
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    <TD STYLE="width: 34%; border: black 1pt solid; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Name and Year of Birth </B></FONT></TD>
    <TD STYLE="width: 33%; border-top: black 1pt solid; border-right: black 1pt solid; border-bottom: black 1pt solid; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Position(s)&nbsp;with Trust </B></FONT></TD>
    <TD STYLE="width: 33%; border-top: black 1pt solid; border-right: black 1pt solid; border-bottom: black 1pt solid; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Principal Occupation(s)</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: black 1pt solid; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Daniel Dufresne (1974)</FONT></TD>
    <TD STYLE="border-right: black 1pt solid; border-bottom: black 1pt solid; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Vice President (since June&nbsp;30, 2021)</FONT></TD>
    <TD STYLE="border-right: black 1pt solid; border-bottom: black 1pt solid; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Executive Vice President and Chief Operating Officer, CAM, CILLC, Calamos Advisors, and CWM (since April&nbsp;2021); prior thereto </FONT><FONT STYLE="font-size: 10pt">Citadel (1999-2020); Partner (2008-2020); Managing Director, Global Treasurer (2008-2020); Global Head of Operations (2011-2020); Global Head of Counterparty Strategy (2018-2020); Senior Advisor to the COO (2020); CEO, Citadel Clearing LLC (2015-2020).</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>Effective immediately, the third paragraph on page&nbsp;S-38 of
the Statement of Additional Information shall be deleted and replaced with the following:</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; color: #231f20">Calamos Advisors is a wholly owned subsidiary of Calamos
Investments LLC (&ldquo;CILLC&rdquo;). Calamos Asset Management,&nbsp;Inc. (&ldquo;CAM&rdquo;) is the sole manager of CILLC. As of April&nbsp;1,
2021, approximately 22% of the outstanding interests of CILLC was owned by CAM and the remaining approximately 78% of CILLC was owned
by Calamos Partners LLC (&ldquo;CPL&rdquo;) and John P. Calamos,&nbsp;Sr. CAM was owned by John P. Calamos,&nbsp;Sr. and John S. Koudounis,
and CPL was owned by John S. Koudounis and Calamos Family Partners,&nbsp;Inc. (&ldquo;CFP&rdquo;). CFP was beneficially owned by members
of the Calamos family, including John P. Calamos,&nbsp;Sr. In addition, Mr.&nbsp;Koudounis has the option to purchase a controlling interest
in CPL upon the death or permanent disability of John P. Calamos,&nbsp;Sr., provided Mr.&nbsp;Koudounis is then serving as Chief Executive
Officer of CAM and CILLC. John P. Calamos,&nbsp;Sr., is an affiliated person of the Funds and Calamos Advisors by virtue of his position
as Chairman, Trustee and President of the Trust and Chairman and Global Chief Investment Officer (&ldquo;Global CIO&rdquo;) of Calamos
Advisors. John S. Koudounis, Robert F. Behan, Thomas E. Herman, J. Christopher Jackson, Stephen Atkins, and Daniel Dufresne are affiliated
persons of the Funds and Calamos Advisors by virtue of their positions as Vice President; Vice President; Vice President and Chief Financial
Officer; Vice President and Secretary; Treasurer; and Vice President of the Trust; respectively, and as President and Chief Executive
Officer; Executive Vice President and Chief Distribution Officer; Executive Vice President and Chief Financial Officer; Senior Vice President,
General Counsel and Secretary; Senior Vice President and Head of Fund Administration; and Executive Vice President and Chief Operating
Officer of Calamos Advisors, respectively.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Please retain this supplement for future reference.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right; margin: 0pt 1in 0pt 0">CSQSPT 06/21</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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