<Page>
As Filed with the Securities and Exchange Commission on April 6, 2004
1933 Act File No. 333-_______
1940 Act File No. 811 - 03763
================================================================================
Securities and Exchange Commission
Washington, D.C. 20549
----------
Registration Statement on
Form S-6
----------
For Registration Under the Securities Act of 1933
of Securities of Unit Investment Trusts
Registered on Form N-8B-2
A. Exact Name of Trust: Claymore Securities Defined Portfolios, Series 175
B. Name of Depositor: Claymore Securities, Inc.
C. Complete Address of Depositor's Principal Executive Offices:
Claymore Securities, Inc.
210 North Hale Street
Wheaton, Illinois 60187
D. Name and Complete Address of Agent for Service:
Copies to:
Nicholas Dalmaso, Esq. Eric F. Fess
Senior Managing Director
and General Counsel
Claymore Securities, Inc. Chapman and Cutler LLP
210 North Hale Street 111 West Monroe Street
Wheaton, Illinois 60187 Chicago, Illinois 60603
(630) 784-6300 (312) 845-3000
It is proposed that this filing will become effective (check appropriate
box)
/ / immediately upon filing pursuant to paragraph (b)
/ / on (date) pursuant to paragraph (b)
/ / 60 days after filing pursuant to paragraph (a)
/ / on (date) pursuant to paragraph (a) of rule 485 or 486
/ / This post-effective amendment designates a new effective date for a
previously filed post-effective amendment.
E. Title of Securities Being Registered: Units of fractional undivided
beneficial interest.
F. Approximate Date of Proposed Sale to Public: As soon as practicable after
the effective date of the
Registration Statement.
/ / Check box if it is proposed that this filing will become effective on
(date) at (time) pursuant to Rule 487.
================================================================================
The registration hereby amends this Registration Statement on such date or dates
as may be necessary to delay its effective date until the registrant shall file
a further amendment which specifically states that this Registration Statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a)
may determine.
<Page>
PRELIMINARY PROSPECTUS DATED APRIL 6, 2004
SUBJECT TO COMPLETION
[LOGO OMITTED]
Claymore Securities Defined Portfolios, Series 175
Real Estate Income Portfolio, Series 2
Large-Cap Core Portfolio, Series 3
Final prospectuses for prior Series of the Claymore Securities Defined
Portfolios are hereby incorporated by reference and used as part of a
preliminary prospectus for Claymore Securities Defined Portfolios, Series 175
(the "TRUST"). The final prospectus for the Trust is expected to be
substantially similar to the previous prospectuses. However, specific
information with respect to the Trust, including pricing, the size and
composition of the Trust's portfolio, the number of units of the Trust, dates
and summary information regarding the characteristics of securities to be
deposited in the Trust is not now available and will be different from that
shown since Trust has a unique portfolio. Accordingly, the information contained
herein with regard to the previous Trust should be considered as being included
for informational purposes only.
The Securities and Exchange Commission has not approved or disapproved
these securities or passed upon the adequacy of this Prospectus. Any
representation to the contrary is a criminal offense.
The information in this Prospectus is not complete and may be changed.
We may not sell these securities until the registration statement filed with the
Securities and Exchange Commission is effective. This Prospectus is not an offer
to sell the securities and it is not soliciting an offer to buy these securities
in any state where the offer or sale is not permitted.
Incorporated herein by reference are the prospectuses from Claymore Securities
Defined Portfolios, Series 157 (Registration No. 333-108548) dated September 10,
2003 and Claymore Securities Defined Portfolios, Series 156 (Registration No.
333-107248) dated October 1, 2003 which shall be used as a preliminary
prospectus for Claymore Securities Defined Portfolios, Series 175. The final
prospectus for Claymore Securities Defined Portfolios, Series 157, was filed
pursuant to Rule 497 under the Securities Act on September 11, 2003. The final
prospectus for Claymore securities Defined Portfolios, Series 156, was filed
pursuant to rule 497 under the Securities Act on October 6, 2003.
<Page>
Contents of Registration Statement
A. Bonding Arrangements of Depositor:
The Depositor has obtained the following Securities Dealer Blanket Bond
for its officers, directors and employees:
Insurer/Policy No. Amount
National Union Fire Insurance
Company of Pittsburgh, Pennsylvania $250,000
959-9000
This Registration Statement comprises the following papers and
documents.
The Facing Sheet
The Prospectus
The Signatures
Consents of Counsel
The following exhibits:
1.1 Reference Trust Agreement (to be supplied by amendment).
1.1.1 Standard Terms and Conditions of Trust (Reference is made to Exhibit
1.1.1 to Amendment No.1 to the Registration Statement on Form S-6 for
Claymore Securities Defined Portfolios, Series 116 (File No. 333-72828
filed on December 18, 2001).
2.1 Code of Ethics (Reference is made to Exhibit 2.1 to the Registration
Statement on Form S-6 for Claymore Securities Deferred Portfolios,
Series 171 (File No. 333-112575 filed on February 19, 2004).
1.1 Opinion of counsel as to legality of the securities being registered
including a consent to the use of its name in the Registration Statement
(to be supplied by amendment).
1.2 Opinion of counsel as to Federal Income tax status of the securities
being registered including a consent to the use of its name in the
Registration Statement (to be supplied by amendment).
1.3 Opinion of counsel as to New York Income tax status of the securities
being registered including a consent to the use of its name in the
Registration Statement (to be supplied by amendment).
1.4 Opinion of counsel as to the Trustee and the Trust (s) including a
consent to the use of its name in the Registration Statement (to be
supplied by amendment).
1.1 Consent of Independent Auditors (to be supplied by amendment).
<Page>
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, the
Registrant, Claymore Securities Defined Portfolios, Series 175 has duly caused
this Registration Statement to be signed on its behalf by the undersigned
thereunto duly authorized, in the City of Wheaton, and State of Illinois, on the
6th day of April, 2004.
Claymore Securities Defined Portfolios,
Series 175, Registrant
By: Claymore Securities, Inc., Depositor
/s/ Nicholas Dalmaso
By:
Nicholas Dalmaso
Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below on April 6, 2004 by the following
persons, who constitute a majority of the Board of Directors of Claymore
Securities, Inc.
<Table>
<Caption>
SIGNATURE* TITLE** DATE
) By: /s/ Nicholas Dalmaso
) --------------------
) Nicholas Dalmaso
Attorney-in-Fact*
)
David Hooten* Chairman of the Board of ) April 6, 2004
Directors )
)
/s/ Charles Millington Chief Financial Officer April 6, 2004
- ----------------------
Charles Millington
/s/ Nicholas Dalmaso Executive Vice President, April 6, 2004
- -------------------- Secretary, Treasurer and
Nicholas Dalmaso Director
</Table>
- ----------
* An executed copy of the related power of attorney was filed as Exhibit 6.0
to Registration Statement No. 333-98345 on August 22, 2002.
** The titles of the persons named herein represent their capacity in and
relationship to Claymore Securities, Inc., the Depositor.
<Page>
CONSENT OF INDEPENDENT AUDITORS
The consent of Grant Thronton LLP to the use of its report and to the
reference to such firm in the Prospectus included in the Registration Statement
will be filed as Exhibit 4.1 to the Registration Statement.
CONSENT OF CHAPMAN AND CUTLER LLP
The consent of Chapman and Cutler LLP to the use of its name in the
Prospectus included in the Registration Statement will be contained in its
opinions to be filed as Exhibits 3.1 and 3.2 to the Registration Statement.
CONSENT OF EMMET, MARVIN & MARTIN LLP
The consent of Emmet, Marvin & Martin LLP to the use of its name in the
Prospectus included in the Registration Statement will be contained in its
opinions to be filed as Exhibits 3.3 and 3.4 to the Registration Statement.
<Page>
MEMORANDUM
Re: Claymore Securities Defined Portfolios, Series 175
The list of securities comprising the trust of the fund, the evaluation,
record and distribution dates and other changes pertaining specifically to the
new series, such as size and number of units of the trust in the fund and the
statement of financial condition of the new fund will be filed by amendment.
1940 ACT
FORMS N-8A AND N-8B-2
Form N-8A and Form N-8B-2 were filed in respect of Claymore Securities
Defined Portfolios, Series 116 (and subsequent series) (File No. 811-03763).
1933 ACT
THE INDENTURE
The form of the proposed Standard Terms and Conditions of Trust is
expected to be in all respects consistent with the form of the Standard Terms
and Conditions of Trust dated December 18, 2001 relative to Claymore Securities
Defined Portfolios, Series 116.
Chapman and Cutler LLP
Chicago, Illinois
April 6, 2004