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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">UNITED STATES</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">SECURITIES AND
EXCHANGE COMMISSION</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">Washington,
D.C. 20549</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">FORM 8-K</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">CURRENT REPORT</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">Pursuant to
Section 13 OR 15(d) of the</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">Securities Exchange
Act of 1934</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">Date of report
(Date of earliest event reported): June 15, 2015</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">SYNTHETIC FIXED-INCOME
SECURITIES, INC. ON BEHALF OF:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">STRATS(SM) TRUST
FOR UNITED STATES CELLULAR CORPORATION SECURITIES, SERIES 2004-6</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">(Exact Name
of Registrant as Specified in Its Charter)</FONT></P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; width: 33%">&nbsp;</TD>
    <TD STYLE="text-align: center; width: 34%">333-111858-01</TD>
    <TD STYLE="text-align: center; width: 33%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center">Delaware</TD>
    <TD STYLE="text-align: center">001-32156</TD>
    <TD STYLE="text-align: center">52-2316339</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center; border-top: Black 1pt solid">(State or Other Jurisdiction</TD>
    <TD STYLE="text-align: center; border-top: Black 1pt solid">(Commission File</TD>
    <TD STYLE="text-align: center; border-top: Black 1pt solid">(I.R.S. Employer</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center">of Incorporation)</TD>
    <TD STYLE="text-align: center">Number)</TD>
    <TD STYLE="text-align: center">Identification
No.)</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="color: Black">&nbsp;</FONT></P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Synthetic Fixed-Income Securities, Inc.&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">301 South College&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Charlotte, North Carolina </P>
</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center; vertical-align: bottom">28288</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>(Address of Principal Executive Offices)</TD>
    <TD STYLE="text-align: center">(Zip Code)</TD></TR>
</TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black">Registrant's telephone number, including
area code: <U>(212) 214-6277</U></FONT></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black"><U>No Change</U></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black"><U>(Former name
or former address, if changed since last report)</U></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black">Check the appropriate box below
if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any following provisions
(see General Instruction A.2. below):</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.5in"><FONT STYLE="color: Black"><FONT STYLE="font-family: Wingdings">&#111;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.5in"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.5in"><FONT STYLE="color: Black"><FONT STYLE="font-family: Wingdings">&#111;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Soliciting material pursuant to Rule 14a-12(b) under the Exchange Act (17 CFR 240.14a-12)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.5in"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.5in"><FONT STYLE="color: Black"><FONT STYLE="font-family: Wingdings">&#111;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.5in"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.5in"><FONT STYLE="color: Black"><FONT STYLE="font-family: Wingdings">&#111;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD></TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black">The STRATS Trust For United States
Cellular Corporation Securities, Series 2004-6, which we refer to herein as the &#8220;Trust,&#8221; was formed pursuant to the
Base Trust Agreement, dated as of September 26, 2003, between Synthetic Fixed-Income Securities, Inc., as depositor, and U.S.
Bank Trust National Association, as trustee and securities intermediary, as supplemented by the STRATS(SM) Certificates Series
Supplement 2004-6 in respect of the Trust dated as of April 21, 2004.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black"><B>SECTION 8 &#8211; OTHER EVENTS</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black">Item 8.01. OTHER EVENTS</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black">On June 15, 2015 distribution was
made to the holders of the certificates issued by the Trust. Specific information with respect to the distribution is filed as
Exhibit 99.1 hereto.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black">No other reportable transactions
or matters have occurred during the current reporting period.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black">United States Cellular Corporation,
the issuer of the underlying securities, is subject to the information reporting requirements of the Securities Exchange Act of
1934, as amended (the &#8220;Exchange Act&#8221;). For information on United States Cellular Corporation please see its periodic
and current reports filed with the Securities and Exchange Commission (the &#8220;Commission&#8221;) under its Exchange Act file
number, 001-09712. The Commission maintains a site on the World Wide Web at &#8220;http://www.sec.gov&#8221; at which users can
view and download copies of reports, proxy and information statements and other information filed electronically through the Electronic
Data Gathering, Analysis and Retrieval system, or &#8220;EDGAR.&#8221; Periodic and current reports and other information required
to be filed pursuant to the Exchange Act, by United States Cellular Corporation may be accessed on this site. Neither Synthetic
Fixed-Income Securities, Inc. nor the Trustee has participated in the preparation of such reporting documents, or made any due
diligence investigation with respect to the information provided therein. Neither Synthetic Fixed-Income Securities, Inc. nor
the Trustee has verified the accuracy or completeness of such documents or reports. There can be no assurance that events affecting
the issuer of the underlying securities, or the underlying securities themselves have not occurred or have not yet been publicly
disclosed which would affect the accuracy or completeness of the publicly available documents described above.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black"><B>SECTION 9 &#8211; FINANCIAL STATEMENTS
AND EXHIBITS</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black">Item 9.01. FINANCIAL STATEMENTS
AND EXHIBITS</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 9pt"></TD><TD STYLE="width: 18pt"><FONT STYLE="color: Black">(d)</FONT></TD><TD><FONT STYLE="color: Black">The following exhibit is filed
                                         as part of this report:</FONT></TD></TR></TABLE>

<P STYLE="margin-top: 0pt; margin-bottom: 0pt; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="color: Black"></FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 7%; font-size: 10pt"><FONT STYLE="color: Black">&nbsp;</FONT></TD>
    <TD STYLE="width: 4%; font-size: 10pt"><FONT STYLE="color: Black">&nbsp;</FONT></TD>
    <TD STYLE="width: 89%; font-size: 10pt"><FONT STYLE="color: Black">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: Black">99.1&nbsp;&nbsp;</FONT></TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="color: Black">&nbsp;</FONT></TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: Black">Trustee&#8217;s Distribution
    Statement to the STRATS (SM) Certificates, Series 2004-6 for June 15, 2015 Scheduled Distribution Date.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2.5in"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt"><FONT STYLE="color: Black">SIGNATURES</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2.5in"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="color: Black">Pursuant to
the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf
by the undersigned thereunto duly authorized.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="3">Synthetic Fixed-Income Securities,
Inc.</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 5%">By:</TD>
    <TD STYLE="width: 2%; border-bottom: Black 1pt solid">/s/</TD>
    <TD STYLE="border-bottom: Black 1pt solid">Barbara Garafalo</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Name:</TD>
    <TD>&nbsp;</TD>
    <TD>Barbara Garafalo</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Title:</TD>
    <TD>&nbsp;</TD>
    <TD>Vice President</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black">Date: June 15, 2015</FONT></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black"></FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">EXHIBIT
INDEX</FONT></P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 20%"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt"><FONT STYLE="color: Black"><U>Exhibit
                           Number</U></FONT></P></TD>
    <TD STYLE="width: 80%"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="color: Black"><U>Description</U></FONT></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="color: Black">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: Black">99.1</FONT></TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: Black">Trustee&#8217;s Distribution
    Statement to the STRATS (SM) Certificates, Series 2004-6 for June 15, 2015 Scheduled Distribution Date.</FONT></TD></TR>
</TABLE>


<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Black">&nbsp;</FONT></P>

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{"company-data": {"conformed-name": "STRATS SM TRUST FOR U S CELL CORP SEC SERIES 2004 6", "cik": "0001286405", "assigned-sic": "6189", "irs-number": "000000000"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-32156", "film-number": "15945416"}, "business-address": {"street1": "301 SOUTH COLLEGE ST", "city": "CHARLOTTE", "state": "NC", "zip": "28288"}, "mail-address": {"street1": "301 S. COLLEGE ST", "city": "CHARTLOTTE", "state": "NC", "zip": "28288"}}
UNITED STATES
SECURITIES AND
EXCHANGE COMMISSION
Washington,
D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to
Section 13 OR 15(d) of the
Securities Exchange
Act of 1934
Date of report
(Date of earliest event reported): June 15, 2015
SYNTHETIC FIXED-INCOME
SECURITIES, INC. ON BEHALF OF:
STRATS(SM) TRUST
FOR UNITED STATES CELLULAR CORPORATION SECURITIES, SERIES 2004-6
(Exact Name
of Registrant as Specified in Its Charter)
333-111858-01
Delaware
001-32156
52-2316339
(State or Other Jurisdiction
(Commission File
(I.R.S. Employer
of Incorporation)
Number)
Identification
No.)
Synthetic Fixed-Income Securities, Inc.
301 South College
Charlotte, North Carolina
28288
(Address of Principal Executive Offices)
(Zip Code)
Registrant's telephone number, including
area code:
(212) 214-6277
No Change
(Former name
or former address, if changed since last report)
Check the appropriate box below
if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any following provisions
(see General Instruction A.2. below):
o
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12(b) under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
The STRATS Trust For United States
Cellular Corporation Securities, Series 2004-6, which we refer to herein as the "Trust," was formed pursuant to the
Base Trust Agreement, dated as of September 26, 2003, between Synthetic Fixed-Income Securities, Inc., as depositor, and U.S.
Bank Trust National Association, as trustee and securities intermediary, as supplemented by the STRATS(SM) Certificates Series
Supplement 2004-6 in respect of the Trust dated as of April 21, 2004.
SECTION 8 – OTHER EVENTS
Item 8.01. OTHER EVENTS
On June 15, 2015 distribution was
made to the holders of the certificates issued by the Trust. Specific information with respect to the distribution is filed as
Exhibit 99.1 hereto.
No other reportable transactions
or matters have occurred during the current reporting period.
United States Cellular Corporation,
the issuer of the underlying securities, is subject to the information reporting requirements of the Securities Exchange Act of
1934, as amended (the "Exchange Act"). For information on United States Cellular Corporation please see its periodic
and current reports filed with the Securities and Exchange Commission (the "Commission") under its Exchange Act file
number, 001-09712. The Commission maintains a site on the World Wide Web at "http://www.sec.gov" at which users can
view and download copies of reports, proxy and information statements and other information filed electronically through the Electronic
Data Gathering, Analysis and Retrieval system, or "EDGAR." Periodic and current reports and other information required
to be filed pursuant to the Exchange Act, by United States Cellular Corporation may be accessed on this site. Neither Synthetic
Fixed-Income Securities, Inc. nor the Trustee has participated in the preparation of such reporting documents, or made any due
diligence investigation with respect to the information provided therein. Neither Synthetic Fixed-Income Securities, Inc. nor
the Trustee has verified the accuracy or completeness of such documents or reports. There can be no assurance that events affecting
the issuer of the underlying securities, or the underlying securities themselves have not occurred or have not yet been publicly
disclosed which would affect the accuracy or completeness of the publicly available documents described above.
SECTION 9 – FINANCIAL STATEMENTS
AND EXHIBITS
Item 9.01. FINANCIAL STATEMENTS
AND EXHIBITS
(d)
The following exhibit is filed
                                         as part of this report:
99.1
Trustee's Distribution
    Statement to the STRATS (SM) Certificates, Series 2004-6 for June 15, 2015 Scheduled Distribution Date.
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SIGNATURES
Pursuant to
the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf
by the undersigned thereunto duly authorized.
Synthetic Fixed-Income Securities,
Inc.
By:
/s/
Barbara Garafalo
Name:
Barbara Garafalo
Title:
Vice President
Date: June 15, 2015
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EXHIBIT
INDEX
Exhibit
                           Number
Description
99.1
Trustee's Distribution
    Statement to the STRATS (SM) Certificates, Series 2004-6 for June 15, 2015 Scheduled Distribution Date.
4