<PAGE>


================================================================================

                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-K/A

[X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
      ACT OF 1934

FOR THE FISCAL YEAR ENDED: DECEMBER 31, 2004 OR

[ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES ACT OF
      1934

FOR THE TRANSITION PERIOD FROM __________ TO _________.

COMMISSION FILE NUMBER: 333-118832-02

SEQUOIA RESIDENTIAL FUNDING, INC. (AS DEPOSITOR UNDER THE POOLING AND SERVICING
AGREEMENT, DATED SEPTEMBER 1, 2004, PROVIDING FOR THE ISSUANCE OF THE SEQUOIA
MORTGAGE TRUST 2004-9, MORTGAGE PASS-THROUGH CERTIFICATES)

                        SEQUOIA RESIDENTIAL FUNDING, INC.
             (Exact Name of registrant as specified in its charter)

               DELAWARE                              35-2170972
   (State or other jurisdiction of       (I.R.S. employer identification no.)
   incorporation or organization)

                 ONE BELVEDERE PLACE
                      SUITE 330
                   MILL VALLEY, CA                                94941
      (Address of principal executive offices)                  (Zip code)

                                 (415) 389-7373
              (Registrant's telephone number, including area code)

Securities registered pursuant to Section    Securities registered pursuant to
           12(b) of the Act:                    Section 12(g) of the Act:

               NONE                                         NONE
         (Title of class)                             (Title of class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as
defined in Rule 405 of the Securities Act. Yes [ ] or No [X]

Indicate by check mark if the registrant is not required to file reports
pursuant to Section 13 or Section 15(d) of the Act. Yes [ ] or No [X]

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the Registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of Registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

Indicate by check mark whether the Registrant is an accelerated filer (as
defined in Exchange Act Rule 12b-2). Yes [ ] No [X]

Indicate by check mark whether the registrant is a shell company (as defined in
rule 12b-2 of the Exchange Act). Yes [ ] or no [X]

State the aggregate market value of the voting stock held by non-affiliates of
Registrant. The aggregate market value shall be computed by reference to the
price at which the stock was sold, or the average bid and asked prices of such
stock, as of the last business day of the Registrant's most recently completed
second fiscal quarter:

                                 NOT APPLICABLE

                      Documents incorporated by reference:

                                 NOT APPLICABLE

<PAGE>

                        SEQUOIA RESIDENTIAL FUNDING, INC.
        SEQUOIA MORTGAGE TRUST 2004-9, MORTGAGE PASS-THROUGH CERTIFICATES

                                      INDEX

<TABLE>
<CAPTION>
                                                                              Page
                                                                              ----
<S>                                                                           <C>
PART I       ................................................................  3
             ITEM 1     -   BUSINESS.........................................  3
             ITEM 2     -   PROPERTIES.......................................  3
             ITEM 3     -   LEGAL PROCEEDINGS................................  3
             ITEM 4     -   SUBMISSION OF MATTERS TO A VOTE OF
                            SECURITY HOLDERS.................................  3

PART II      ................................................................  3
             ITEM 5     -   MARKET FOR REGISTRANT'S COMMON STOCK, RELATED
                            STOCKHOLDER MATTERS AND ISSUER PURCHASES OF
                            EQUITY SECURITIES................................  3
             ITEM 6     -   SELECTED FINANCIAL DATA..........................  3
             ITEM 7     -   MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                            FINANCIAL CONDITION AND RESULTS OF OPERATIONS....  3
             ITEM 7A    -   QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT
                            MARKET RISK......................................  3
             ITEM 8     -   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA......  3
             ITEM 9     -   CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS
                            ON ACCOUNTING AND FINANCIAL DISCLOSURE...........  3
             ITEM 9A    -   CONTROLS AND PROCEDURES..........................  4
             ITEM 9B    -   OTHER INFORMATION................................  4

PART III     ................................................................  4
             ITEM 10    -   DIRECTORS AND EXECUTIVE OFFICERS OF THE
                            REGISTRANT.......................................  4
             ITEM 11    -   EXECUTIVE COMPENSATION...........................  4
             ITEM 12    -   SECURITY OWNERSHIP OF CERTAIN BENEFICIAL
                            OWNERS AND MANAGEMENT............................  4
             ITEM 13    -   CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS...  5
             ITEM 14    -   PRINCIPAL ACCOUNTANT FEES AND SERVICES...........  5

PART IV      ................................................................  5
             ITEM 15    -   EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND
                            REPORTS ON FORM 8-K..............................  5

SIGNATURES   ................................................................  8

CERTIFICATION................................................................  9

SUPPLEMENTAL INFORMATION TO BE FURNISHED WITH REPORTS FILED PURSUANT TO
SECTION 15(d) OF THE ACT BY REGISTRANTS WHICH HAVE NOT REGISTERED SECURITIES
PURSUANT TO SECTION 12 OF THE ACT............................................ 10

INDEX TO EXHIBITS............................................................ 10
</TABLE>

                                       2
<PAGE>

                                     PART I

ITEM 1     - BUSINESS

             Not Applicable.

ITEM 2     - PROPERTIES

             Sequoia Residential Funding, Inc. (the "Depositor") will furnish
information regarding the Mortgaged Properties by reference to the Annual
Compliance Certificates to be filed herein under Item 15.

ITEM 3     - LEGAL PROCEEDINGS

             The Depositor is not aware of any material pending legal
proceedings involving either the Mortgage Pass-Through Certificates, the Sequoia
Mortgage 2004-9 Trust (the "Trust); the Pooling and Servicing Agreement; the
Trustee; the Depositor; the Seller; the Master Servicer or the Servicers which
relates to the Trust.

ITEM 4     - SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

             No matter has been submitted to a vote of the holders of beneficial
interests in the Trust through the solicitation of proxies or otherwise.

                                     PART II

ITEM 5     - MARKET FOR REGISTRANT'S COMMON STOCK, RELATED STOCKHOLDER MATTERS
             AND ISSUER PURCHASES OF EQUITY SECURITIES

             To the best knowledge of the Depositor, there is no established
public trading market for the Certificates.

             The Certificates issued by the Trust are held by the Depository
Trust Company ("DTC") which in turn maintains records of holders of beneficial
interests in the Certificates. Based on information obtained by the Trust from
DTC, as of December 31, 2004, there were nine (9) holders of the Class A-1
Certificates, seven (7) holders of the Class A-2 Certificates, three (3) holders
of the Class X-A Certificates, one (1) holder of the Class X-B Certificates, one
(1) holder of the Class B-1 Certificates, two (2) holders of the Class B-2
Certificates, and two (2) holders of the Class B-3 Certificates.

ITEM 6     - SELECTED FINANCIAL DATA

             Not Applicable.

ITEM 7     - MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
             RESULTS OF OPERATIONS

             Not Applicable.

ITEM 7A    - QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

             Not Applicable.

ITEM 8     - FINANCIAL STATEMENTS AND SUPPLEMENTARY INFORMATION

             Not Applicable.

ITEM 9     - CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
             FINANCIAL DISCLOSURE

             There were no changes of accountants or disagreements on accounting
or financial disclosures between the Depositor and its accountants.

                                       3
<PAGE>

ITEM 9A    - CONTROLS AND PROCEDURES

             Not Applicable.

ITEM 9B    - OTHER INFORMATION

             Not Applicable.

                                    PART III

ITEM 10    - DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

             Not Applicable.

ITEM 11    - EXECUTIVE COMPENSATION

             Not Applicable.

ITEM 12    - SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

             The Depositor is a Delaware corporation and indirect wholly-owned
subsidiary of Redwood Trust, Inc. The Trust is a grantor trust established under
the Pooling and Servicing Agreement.

             The following table sets forth (i) the identification of each
entity owning more than 5% of the outstanding principal amount of each class of
the Pass-Through Certificates; (ii) the principal amount of each class of the
Pass-Through Certificates owned by each and (iii) the percent that the principal
amount of each class of the Pass-Through Certificates owned by such entity
represents of the outstanding principal amount of such class of Pass-Through
Certificates. The information set forth in the table for the Certificates is
based upon information obtained by the Trust from DTC and represents ownership
of beneficial interest in the Certificates held by DTC. The Depositor is not
aware of any Schedules 13D or 13G filed with the Securities and Exchange
Commission in respect of the Certificates.

CLASS A-1

<TABLE>
<CAPTION>
   Identification   Principal Amount Owned   Percentage of Outstanding Amount
   --------------   ----------------------   --------------------------------
<S>                 <C>                      <C>
BANK OF NY                $  44,364,000                    9.78%
FORTIS LLC                $  24,000,000                    5.29%
RBCCAPMKTS                $  40,000,000                    8.82%
BNY/CDC-FP                $  30,000,000                    6.62%

JPMCBNA                   $  45,000,000                    9.93%
SSB&T CO                  $  70,000,000                   15.44%

BNY/5th3rd                $  50,000,000                   11.03%
MELLON TR                 $  50,000,000                   11.03%
SSB-BK PFL                $ 100,000,000                   22.06%
</TABLE>

CLASS A-2

<TABLE>
<CAPTION>
   Identification   Principal Amount Owned   Percentage of Outstanding Amount
   --------------   ----------------------   --------------------------------
<S>                 <C>                      <C>
BANK OF NY                $ 65,000,000                    21.93%
JPMCBNA                   $ 24,000,000                     8.09%
SSB&T CO                  $157,310,000                    53.09%

MELLON TR                 $ 26,000,000                     8.77%

NRTHRN TR                 $ 21,000,000                     7.09%
</TABLE>

                                       4
<PAGE>

CLASS X-A

<TABLE>
<CAPTION>
   Identification   Principal Amount Owned   Percentage of Outstanding Amount
   --------------   ----------------------   --------------------------------
<S>                 <C>                      <C>
BEAR STERN                $ 174,837,000                   23.32%
GOLDMAN                   $ 200,000,000                   26.68%
MERRIL                    $ 374,837,000                      50%
</TABLE>

CLASS X-B

<TABLE>
<CAPTION>
   Identification   Principal Amount Owned   Percentage of Outstanding Amount
   --------------   ----------------------   --------------------------------
<S>                 <C>                      <C>
CITIBANK                  $ 23,157,000                   100.00%
</TABLE>

CLASS B-1

<TABLE>
<CAPTION>
   Identification   Principal Amount Owned   Percentage of Outstanding Amount
   --------------   ----------------------   --------------------------------
<S>                 <C>                      <C>
BNY/ 5th3rd               $ 14,915,000                   100.00%
</TABLE>

CLASS B-2

<TABLE>
<CAPTION>
   Identification   Principal Amount Owned   Percentage of Outstanding Amount
   --------------   ----------------------   --------------------------------
<S>                 <C>                      <C>
LASALLE BK                $ 4,242,000                     51.47%
ML SFKPG                  $ 4,000,000                     48.53%
</TABLE>

CLASS B-3

<TABLE>
<CAPTION>
   Identification   Principal Amount Owned   Percentage of Outstanding Amount
   --------------   ----------------------   --------------------------------
<S>                 <C>                      <C>
CITIBANK                  $ 3,858,000                     89.35%
WELLS BKNA                $   460,000                     10.65%
</TABLE>

ITEM 13   -  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

             None.

ITEM 14      PRINCIPAL ACCOUNTANT FEES AND SERVICES

             Not Applicable.

                                     PART IV

ITEM 15    - EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

             (a)   The following documents are filed as part of this report:

                   1.    Financial Statements:

                         Not applicable.

                                       5
<PAGE>

                   2.    Financial Statement Schedules:

                         Not applicable.

                   3.    Exhibits:

                         Exhibit No.     Description
                         31.1            Sarbanes-Oxley Certification.

                         99.1            Statement of Compliance of the Servicer
                                         pursuant to Section 7.04(a) of The
                                         Master Servicing Agreement between RWT
                                         Holdings, Inc. ("RWT") and Morgan
                                         Stanley Dean Witter Credit Corporation,
                                         dated August 1, 2002, as modified by
                                         the related Acknowledgements (the
                                         "RWT/Morgan Servicing Agreement").

                         99.2            Report of Independent Registered
                                         Public Accounting Firm pursuant
                                         to Section 7.04(b) of the
                                         RWT/Morgan Servicing Agreement.

                         99.3            Statement of Compliance of the Servicer
                                         pursuant to Section 6.04 of The
                                         Mortgage Loan Flow Purchase, Sale and
                                         Servicing Agreement, dated as of August
                                         1, 2002, between RWT and GreenPoint
                                         Mortgage Funding, Inc., as modified by
                                         the related Acknowledgements (the
                                         "RWT/GreenPoint Servicing Agreement").

                         99.4            Report of Independent Account pursuant
                                         to Section 6.05 of the RWT/GreenPoint
                                         Servicing Agreement.

                         99.5            Statement of Compliance of the Servicer
                                         pursuant to Section 7.04 of The
                                         Mortgage Loan Flow Purchase, Sale &
                                         Servicing Agreement among RWT, Cendant
                                         Mortgage Corporation ("Cendant") and
                                         Bishop's Gate Residential Mortgage
                                         Trust (formerly known as Cendant
                                         Residential Mortgage Trust), as
                                         Sellers, and Cendant, as Servicer,
                                         dated August 1, 2002, as modified by
                                         the related Acknowledgements (the
                                         "RWT/Cendant Servicing Agreement").

                         99.6            Report of Independent Registered
                                         Public Accounting Firm pursuant to
                                         Section 7.05 of the RWT/Cendant
                                         Servicing Agreement.

                         99.7            Statement of Compliance of the Servicer
                                         pursuant to Section 11.20 of the Flow
                                         Mortgage Loan Sale and Servicing
                                         Agreement, dated as of April 1, 2003,
                                         between RWT and Bank of America, N.A.,
                                         as modified by the related
                                         Acknowledgements (the "RWT/Bank of
                                         America Servicing Agreement").

                         99.8            Report of Independent Accountant
                                         pursuant to Section 11.21 of the
                                         RWT/Bank of America Servicing
                                         Agreement.

                         99.9            Statement of Compliance of the Servicer
                                         pursuant to Section 6.04 of the Loan
                                         Servicing Agreement, dated as of
                                         February 1, 2004 between RWT and GMAC
                                         Mortgage Corporation, as modified by
                                         the related Acknowledgements (the
                                         "RWT/GMAC Servicing Agreement").

                         99.10           Report of Independent Accountant
                                         pursuant to Section 6.05 of the
                                         RWT/GMAC Servicing Agreement.

                                       6
<PAGE>

      (b)   Reports on Form 8-K field during the last quarter of the period
            covered by this report.

            DATE OF REPORTS ON FORM 8-K   ITEMS REPORTED/FINANCIAL STATEMENTS
                                          FILED

            September 29, 2004            Report filing Computational Materials
                                          and Collateral Term Sheet

            October 14, 2004              Report filing the Pooling and
                                          Servicing Agreement and the Tax
                                          Opinion

            November 5, 2004              Trustee's Monthly Report for the
                                          October Distribution to
                                          Certificateholders

            December 3, 2004              Trustee's Monthly Report for the
                                          November Distribution to
                                          Certificateholders

            January 5, 2005               Trustee's Monthly Report for the
                                          December Distribution to
                                          Certificateholders

                                       7
<PAGE>

                                   SIGNATURES

      Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Depositor has duly caused this Report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                    SEQUOIA RESIDENTIAL FUNDING, INC.

                                    By: /s/ Harold F. Zagunis
                                        ----------------------
                                    Name: Harold F. Zagunis
                                    Title: Chief Financial Officer and Secretary

Date: December 5, 2005.

                                       8
<PAGE>

                                  CERTIFICATION

      I, Harold F. Zagunis, Chief Financial Officer and Secretary of Sequoia
Residential Funding, Inc., a Delaware corporation, hereby certify that:

      1. I have reviewed this annual report on Form 10-K/A, and all reports on
Form 8-K containing distribution or servicing reports filed in respect of the
Certificates for periods included in the year covered by this annual report, of
Sequoia Residential Funding, Inc.;

      2. Based on my knowledge, the information in these reports, taken as a
whole, does not contain any untrue statement of a material fact or omit to state
a material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading as of the
last day of the period covered by this annual report;

      3. Based on my knowledge, the distribution or servicing information
required to be provided to the trustee by the servicer under the pooling and
servicing agreement, for inclusion in these reports is included in these
reports;

      4. Based on my knowledge and upon the annual compliance statement included
in the report and required to be delivered to the trustee in accordance with the
terms of the pooling and servicing agreement, and except as disclosed in the
reports, the servicer has fulfilled its obligations under the servicing
agreement; and

      5. The reports disclose all significant deficiencies relating to the
servicer's compliance with the minimum servicing standards based upon the report
provided by an independent registered public accounting firm, after conducting a
review in compliance with the Uniform Attestation Program for Mortgage Bankers
or similar procedure, as set forth in the pooling and servicing agreement, that
is included in these reports.

      In giving the certifications above, I have reasonably relied on
information provided to me by the following unaffiliated parties: Morgan Stanley
Dean Witter Credit Corporation, as Servicer, GreenPoint Mortgage Funding, Inc.,
as Servicer, Cendant Mortgage Corporation, as Servicer, Bank of America, N.A.,
as Servicer, and GMAC Mortgage Corporation, as Servicer.

Date: December 5, 2005

/s/ Harold F. Zagunis
-------------------------
Signature
Name: Harold F. Zagunis
Title: Chief Financial Officer and Secretary

                                       9
<PAGE>

SUPPLEMENTAL INFORMATION TO BE FURNISHED WITH REPORTS FILED PURSUANT TO SECTION
15(d) OF THE ACT BY REGISTRANTS WHICH HAVE NOT REGISTERED SECURITIES PURSUANT TO
SECTION 12 OF THE ACT.

      No annual report, proxy statement, proxy materials or otherwise were sent
to Certificateholders.

                                INDEX TO EXHIBITS
                                   Item 15(C)

Exhibit No.    Description
31.1           Sarbanes-Oxley Certification.

99.1           Statement of Compliance of the Servicer pursuant to Section
               7.04(a) of The Master Servicing Agreement between RWT Holdings,
               Inc. ("RWT") and Morgan Stanley Dean Witter Credit Corporation,
               dated August 1, 2002, as modified by the related Acknowledgements
               (the "RWT/ Morgan Servicing Agreement").

99.2           Report of Independent Registered Public Accounting Firm pursuant
               to Section 7.04(b) of the RWT/Morgan Servicing Agreement.

99.3           Statement of Compliance of the Servicer pursuant to Section 6.04
               of The Mortgage Loan Flow Purchase, Sale and Servicing Agreement,
               dated as of August 1, 2002, between RWT and GreenPoint Mortgage
               Funding, Inc., as modified by the related Acknowledgements (the
               "RWT/GreenPoint Servicing Agreement").

99.4           Report of Independent Account pursuant to Section 6.05 of
               RWT/GreenPoint Servicing Agreement.

99.5           Statement of Compliance of the Servicer pursuant to Section 7.04
               of The Mortgage Loan Flow Purchase, Sale & Servicing Agreement
               among RWT, Cendant Mortgage Corporation ("Cendant") and Bishop's
               Gate Residential Mortgage Trust (formerly known as Cendant
               Residential Mortgage Trust), as Sellers, and Cendant, as
               Servicer, dated August 1, 2002, as modified by the related
               Acknowledgements (the "RWT/Cendant Servicing Agreement").

99.6           Report of Independent Registered Public Accounting Firm pursuant
               to Section 7.05 of the RWT/Cendant Servicing Agreement.

99.7           Statement of Compliance of the Servicer pursuant to Section 11.20
               of the Flow Mortgage Loan Sale and Servicing Agreement, dated as
               of April 1, 2003, between RWT and Bank of America, N.A., as
               modified by the related Acknowledgements (the "RWT/Bank of
               America Servicing Agreement").

99.8           Report of Independent Accountant pursuant to Section 11.21 of the
               RWT/Bank of America Servicing Agreement.

99.9           Statement of Compliance of the Servicer pursuant to Section 6.04
               of the Loan Servicing Agreement, dated as of February 1, 2004,
               between RWT and GMAC Mortgage Corporation, as modified by the
               related Acknowledgements (the "RWT/GMAC Servicing Agreement").

                                       10
<PAGE>

99.10          Report of Independent Accountant pursuant to Section 6.05 of the
               RWT/GMAC Servicing Aggreement.

                                       11