<PAGE>


                       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): May 15, 2006

                          MERRILL LYNCH DEPOSITOR, INC.
                     (ON BEHALF OF PPLUS TRUST SERIES GSC-2)
             (Exact name of registrant as specified in its charter)

          DELAWARE             001-32247                    13-3891329
      (State or other        (Commission                (I. R. S. Employer
      jurisdiction  of        File Number)              Identification No.)
       incorporation)

   WORLD FINANCIAL CENTER,                                     10080
     NEW YORK, NEW YORK                                     (Zip Code)
    (Address of principal
     executive offices)
                           --------------------------

       Registrant's telephone number, including area code: (212) 449-1000

                      INFORMATION TO BE INCLUDED IN 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 of the
following provisions (see General Instruction A.2.):

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR
    230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
    240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
    Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
    Act (17 CFR 240.13e-4(c))


<PAGE>


SECTION 1.   REGISTRANT'S BUSINESS AND OPERATIONS

             Not applicable.

SECTION 2.   FINANCIAL INFORMATION

             Not applicable.

SECTION 3.   SECURITIES AND TRADING MARKETS

             Not applicable.

SECTION 4.   MATTERS RELATED TO ACCOUNTANTS AND FINANCIAL STATEMENTS

             Not applicable.

SECTION 5.   CORPORATE GOVERNANCE AND MANAGEMENT

             Not applicable.

SECTION 6.   ASSET-BACKED SECURITIES

             Not applicable.

SECTION 7.   REGULATION FD

             Not applicable.

SECTION 8.   OTHER EVENTS

 ITEM 8.01   OTHER EVENTS

      99.1   Distribution to holders of the PPLUS Trust Certificates Series
             GSC-2 on
             May 15, 2006.

                     For information with respect to the underlying securities
              held by PPLUS Trust Series GSC-2, please refer to The Goldman
              Sachs Group, Inc.'s (Commission file number 001-14965) periodic
              reports, including annual reports on Form 10-K, quarterly reports
              on Form 10-Q and current reports on Form 8-K, and other
              information on file with the Securities and Exchange Commission
              (the "SEC"). You can read and copy these reports and other
              information at the public reference facilities maintained by the
              SEC at Room 1580, 100 F Street, NE, Washington, D.C. 20549. You
              may obtain copies of this material for a fee by writing to the
              SEC's Public Reference Section of the SEC at 100 F Street, NE,
              Washington, D.C. 20549. You may obtain information about the
              operation of the Public Reference Room by calling the SEC at
              1-800-SEC-0330. You can also access some of this information
              electronically by means of the SEC's website on the Internet at
              http://www.sec.gov, which contains reports, proxy and information
              statements and other information that the underlying securities
              guarantor and the underlying securities issuer has filed
              electronically with the SEC.

<PAGE>

                     Although we have no reason to believe the information
              concerning the underlying securities and the junior subordinated
              debentures or the underlying securities issuer and the underlying
              securities guarantor contained in the underlying securities
              guarantor's Exchange Act reports is not reliable, neither the
              depositor nor the trustee participated in the preparation of such
              documents or made any due diligence inquiry with respect to the
              information provided therein. No investigation with respect to the
              underlying securities issuer and the underlying securities
              guarantor (including, without limitation, no investigation as to
              their financial condition or creditworthiness) or of the
              underlying securities and the junior subordinated debentures has
              been made. You should obtain and evaluate the same information
              concerning the underlying securities issuer and the underlying
              securities guarantor as you would obtain and evaluate if your
              investment were directly in the underlying securities or in other
              securities issued by the underlying securities issuer or the
              underlying securities guarantor. There can be no assurance that
              events affecting the underlying securities and the junior
              subordinated debentures or the underlying securities issuer and
              the underlying securities guarantor 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

       (a)    Financial statements of business acquired.

              None.

       (b)    Pro forma financial information.

              None.

       (c)    Shell company transaction.

              Not applicable.

       (d)    Exhibits.

              99.1   Trustee's report in respect of the May 15, 2006
                     distribution to holders of the PPLUS Trust Certificates
                     Series GSC-2.

<PAGE>


                                   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, hereunto duly authorized.

                                   MERRILL LYNCH DEPOSITOR, INC.

Date 06/05/2006                    By: /s/ Zvi Gillon
                                       -------------------------------------
                                   Name:  Zvi Gillon
                                   Title: Vice President



<PAGE>


                                  EXHIBIT INDEX


99.1 Trustee's report in respect of the May 15, 2006 distribution to holders of
     the PPLUS Trust Certificates Series GSC-2.
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{"company-data": {"conformed-name": "PPLUS Trust Series GSC-2", "cik": "0001294808", "assigned-sic": "6189", "irs-number": "000000000", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-32247", "film-number": "06888253"}, "business-address": {"street1": "WORLD FINANCIAL CENTER", "city": "NEW YORK", "state": "NY", "zip": "10281", "phone": "2124491000"}}
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): May 15, 2006

                          MERRILL LYNCH DEPOSITOR, INC.
                     (ON BEHALF OF PPLUS TRUST SERIES GSC-2)
             (Exact name of registrant as specified in its charter)

          DELAWARE             001-32247                    13-3891329
      (State or other        (Commission                (I. R. S. Employer
      jurisdiction  of        File Number)              Identification No.)
       incorporation)

   WORLD FINANCIAL CENTER,                                     10080
     NEW YORK, NEW YORK                                     (Zip Code)
    (Address of principal
     executive offices)
                           --------------------------

       Registrant's telephone number, including area code: (212) 449-1000

                      INFORMATION TO BE INCLUDED IN 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 of the
following provisions (see General Instruction A.2.):

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR
    230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
    240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
    Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
    Act (17 CFR 240.13e-4(c))
SECTION 1.   REGISTRANT'S BUSINESS AND OPERATIONS

             Not applicable.

SECTION 2.   FINANCIAL INFORMATION

             Not applicable.

SECTION 3.   SECURITIES AND TRADING MARKETS

             Not applicable.

SECTION 4.   MATTERS RELATED TO ACCOUNTANTS AND FINANCIAL STATEMENTS

             Not applicable.

SECTION 5.   CORPORATE GOVERNANCE AND MANAGEMENT

             Not applicable.

SECTION 6.   ASSET-BACKED SECURITIES

             Not applicable.

SECTION 7.   REGULATION FD

             Not applicable.

SECTION 8.   OTHER EVENTS

 ITEM 8.01   OTHER EVENTS

      99.1   Distribution to holders of the PPLUS Trust Certificates Series
             GSC-2 on
             May 15, 2006.

                     For information with respect to the underlying securities
              held by PPLUS Trust Series GSC-2, please refer to The Goldman
              Sachs Group, Inc.'s (Commission file number 001-14965) periodic
              reports, including annual reports on Form 10-K, quarterly reports
              on Form 10-Q and current reports on Form 8-K, and other
              information on file with the Securities and Exchange Commission
              (the "SEC"). You can read and copy these reports and other
              information at the public reference facilities maintained by the
              SEC at Room 1580, 100 F Street, NE, Washington, D.C. 20549. You
              may obtain copies of this material for a fee by writing to the
              SEC's Public Reference Section of the SEC at 100 F Street, NE,
              Washington, D.C. 20549. You may obtain information about the
              operation of the Public Reference Room by calling the SEC at
              1-800-SEC-0330. You can also access some of this information
              electronically by means of the SEC's website on the Internet at
              http://www.sec.gov, which contains reports, proxy and information
              statements and other information that the underlying securities
              guarantor and the underlying securities issuer has filed
              electronically with the SEC.
Although we have no reason to believe the information
              concerning the underlying securities and the junior subordinated
              debentures or the underlying securities issuer and the underlying
              securities guarantor contained in the underlying securities
              guarantor's Exchange Act reports is not reliable, neither the
              depositor nor the trustee participated in the preparation of such
              documents or made any due diligence inquiry with respect to the
              information provided therein. No investigation with respect to the
              underlying securities issuer and the underlying securities
              guarantor (including, without limitation, no investigation as to
              their financial condition or creditworthiness) or of the
              underlying securities and the junior subordinated debentures has
              been made. You should obtain and evaluate the same information
              concerning the underlying securities issuer and the underlying
              securities guarantor as you would obtain and evaluate if your
              investment were directly in the underlying securities or in other
              securities issued by the underlying securities issuer or the
              underlying securities guarantor. There can be no assurance that
              events affecting the underlying securities and the junior
              subordinated debentures or the underlying securities issuer and
              the underlying securities guarantor 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

       (a)    Financial statements of business acquired.

              None.

       (b)    Pro forma financial information.

              None.

       (c)    Shell company transaction.

              Not applicable.

       (d)    Exhibits.

              99.1   Trustee's report in respect of the May 15, 2006
                     distribution to holders of the PPLUS Trust Certificates
                     Series GSC-2.
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, hereunto duly authorized.

                                   MERRILL LYNCH DEPOSITOR, INC.

Date 06/05/2006                    By: /s/ Zvi Gillon
                                       -------------------------------------
                                   Name:  Zvi Gillon
                                   Title: Vice President
EXHIBIT INDEX

99.1 Trustee's report in respect of the May 15, 2006 distribution to holders of
     the PPLUS Trust Certificates Series GSC-2.