<PAGE>   1
                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, 2000

                                       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:  333-81429

MERRILL LYNCH MORTGAGE INVESTORS, INC. (AS DEPOSITOR UNDER THE POOLING AND
SERVICING AGREEMENT, DATED MARCH 1, 2000, PROVIDING FOR THE ISSUANCE OF THE
SEQUOIA MORTGAGE TRUST 4, MORTGAGE LOAN ASSET BACKED CERTIFICATES)

                     MERRILL LYNCH MORTGAGE INVESTORS, INC.
             (Exact Name of registrant as specified in its charter)

<TABLE>
<S>                                                              <C>
                    DELAWARE                                     13-5674085
(State or other jurisdiction of incorporation or    (I.R.S. employer identification no.)
                  organization)
</TABLE>

250 VESEY STREET, WORLD FINANCIAL CENTER
        NORTH TOWER, 10TH FLOOR
              NEW YORK, NY                                   10281-1310
(Address of principal executive offices)                     (Zip code)

                                 (212) 449-0336
              (Registrant's telephone number, including area code)

<TABLE>
<S>                                                           <C>
Securities  registered  pursuant to Section 12(b) of the      Securities  registered  pursuant to Section  12(g) of
                        the Act:                                                    the Act:

                          NONE                                                        NONE
                    (Title of class)                                            (Title of class)
</TABLE>

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]

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 specified date within 60 days prior to the date of filing:

                                 NOT APPLICABLE

                      Documents incorporated by reference:

                                 NOT APPLICABLE

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                     MERRILL LYNCH MORTGAGE INVESTORS, INC.
        SEQUOIA MORTGAGE TRUST 4, MORTGAGE LOAN ASSET BACKED 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 AND
                           RELATED STOCKHOLDER MATTERS..............................................3

               ITEM 6   -  SELECTED FINANCIAL DATA..................................................3

               ITEM 7   -  MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                           FINANCIAL CONDITION AND RESULTS OF OPERATIONS............................3

               ITEM 8   -  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA..............................3

               ITEM 9   -  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS
                           ON ACCOUNTING AND FINANCIAL DISCLOSURE...................................3

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...........................4

PART IV        .....................................................................................5

               ITEM 14  -  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND
                           REPORTS ON FORM 8-K......................................................5

SIGNATURES     .....................................................................................6
INDEX TO EXHIBITS...................................................................................7
</TABLE>




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                                     PART I

ITEM 1   -  BUSINESS

            Not Applicable.

ITEM 2   -  PROPERTIES

            Merrill Lynch Mortgage Investors, Inc. (the "Depositor") will
furnish information regarding the Mortgaged Properties by reference to the
Annual Compliance Certificates to be filed herein under Item 14.

ITEM 3   -  LEGAL PROCEEDINGS

            The Depositor is not aware of any material pending legal proceedings
involving either the Mortgage Loan Asset Backed Certificates, the Sequoia
Mortgage 4 Trust (the "Trust); the Pooling and Servicing Agreement; the
Indenture; the Indenture Trustee; the Depositor; the Seller; or the Servicer
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 AND RELATED STOCKHOLDER MATTERS

            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, 2000, there were fourteen holders of the Class A
Pass-Through 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 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.


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<PAGE>   4

                                    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 wholly-owned limited purpose subsidiary of
Merrill Lynch Mortgage Capital Inc., which is a wholly-owned indirect subsidiary
of Merrill Lynch & Co., Inc. The Trust is a Delaware statutory business trust
wholly-owned by the Depositor.

            The following table sets forth (i) the name and address of each
entity owning more than 5% of the outstanding principal amount of the Class A
Pass-Through Certificates; (ii) the principal amount of the Class A Pass-Through
Certificates owned by each and (iii) the percent that the principal amount of
the Class A Pass-through Certificates owned by such entity represents of the
outstanding principal amount of such Class A 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.

<TABLE>
<CAPTION>
              Name and Address              Principal Amount Owned        Percentage of Outstanding Amount
              ----------------              ----------------------        --------------------------------
<S>                                              <C>                                <C>
      Bank of New York                           $32,500,000                        8.62%
      925 Patterson Plank Road
      Secaucus, NJ  07094

      Bankers Trust Company                      $42,400,000                        11.24%
      648 Grassmere Park Road
      Nashville, TN  37211

      Boston Safe Deposit and Trust              $30,900,000                        8.19%
       Company
      c/o Mellon Bank N.A.
      Thee Mellon Bank Center
      Room 153-3015
      Pittsburgh, PA  15259

      Chase Manhattan Bank                       $125,121,000                       33.18%
      4 New York Plaza, 13th Floor
      New York, NY  10004

      Deutsche Banc Alex. Brown Inc.-             $96,598,000                        25.61%
      DBSI Account
      175 Water Street
      New York, NY  10038

      State Street Bank and Trust                $31,900,000                        8.46%
      Company
      1776 Heritage Drive
      Global Corporate Action Unit
       JAB 5NW
      No. Quincy, MA  02171
</TABLE>


ITEM 13  -  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

            None.


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                                     PART IV

ITEM 14  -  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.

                  2.         Financial Statement Schedules:

                             Not applicable.

                  3.         Exhibits:

<TABLE>
<CAPTION>
                             Exhibit No.           Description
                             -----------           -----------
<S>                                                <C>
                             99.1                  Statement of Compliance of the Servicer pursuant to Section 6.04 of the
                                                   Master Servicing Agreement and Section 2.04(n) of the Insurance and
                                                   Indemnity Agreement.

                             99.2                  Independent Accountant's Report with respect to the Servicer's overall
                                                   servicing operations pursuant to the Pooling and Servicing Agreement.

                             99.3                  Statement of Compliance of the Seller pursuant to Section 2.04(d) of
                                                   the Insurance and Indemnity Agreement.
</TABLE>


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                                   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.

                                          MERRILL LYNCH MORTGAGE INVESTORS, INC.

                                    * By: SEQUOIA MORTGAGE FUNDING CORPORATION,

                                          Not in its individual capacity but
                                          solely as Mortgage Loan Seller,
                                          limited power of attorney, under the
                                          Pooling and Servicing Agreement dated
                                          March 1, 2000

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

Date:    June 14, 2001.

         Pursuant to the requirements of the Securities Exchange Act of 1934,
this Report has been signed below by the following persons on behalf of the
Depositor and in the capacities and on the dates indicated:

<TABLE>
<CAPTION>
                  Signature                      Position                                  Date
                  ---------                      --------                                  ----
<S>                                   <C>                                             <C>
* /s/ Barry S. Blattman               President and Director                          June 14, 2001
------------------------------        (Principal Executive Officer)
Barry S. Blattman


* /s/ Thomas W. Layton                Treasurer and Director                          June 14, 2001
------------------------------        (Principal Financial Officer/Principal
Thomas W. Layton                      Accounting Officer)

* /s/ Michael M. McGovern             Secretary and Director                          June 14, 2001
------------------------------
Michael M. McGovern

* /s/ Donald J. Puglisi               Director                                        June 14, 2001
------------------------------
Donald J. Puglisi
</TABLE>


                                       6
<PAGE>   7

                                INDEX TO EXHIBITS
                                   Item 14(C)

<TABLE>
<CAPTION>
Exhibit No.       Description
-----------       -----------
<S>               <C>
99.1              Statement of Compliance of the Servicer pursuant to Section
                  6.04 of the Master Servicing Agreement and Section 2.04(n) of
                  the Insurance and Indemnity Agreement.

99.2              Independent Accountant's Report with respect to the Servicer's
                  overall servicing operations pursuant to the Pooling and
                  Servicing Agreement.

99.3              Statement of Compliance of the Seller pursuant to Section
                  2.04(d) of the Insurance and Indemnity Agreement.
</TABLE>


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