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

                                  SCHEDULE 13D

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO.3)

                               GigaMedia Limited
--------------------------------------------------------------------------------
                                (Name of Issuer)

                   Ordinary Shares, par value NT$10 per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   Y2711Y104
--------------------------------------------------------------------------------
                                 (CUSIP Number)

--------------------------------------------------------------------------------


                                  Winston Hsia
                          Hoshin Gigamedia Center Inc.
                           14F, 122, Duenhua N. Road
                                 Taipei, Taiwan
                               (886-2) 3518-1102
--------------------------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                               September 10, 2003
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

         If a filing person has previously filed a statement on Schedule 13G to
report the acquisition  which is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(b)(3) or (4), check the following box |_|.

         NOTE: Six copies of this statement, including all exhibits, should be
filed with the  Commission.  See Rule 13d-1(a) for other parties to whom copies
are to be sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).



                         (continued on following pages)

                               Page 1 of 5 pages




---------------------                                         -----------------
CUSIP NO. Y2711Y104                   13D                     PAGE 2 OF 5 PAGES
---------------------                                         -----------------





-------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSONS
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

        Robustos Capital Investments Ltd.
-------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                   (a) |_|
                                                                        (b) |_|
-------------------------------------------------------------------------------
 3.  SEC USE ONLY

-------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS
        AF
-------------------------------------------------------------------------------
 5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
     ITEM 2(d) OR 2(e)                                                      |_|
-------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION
        The British Virgin Islands
-------------------------------------------------------------------------------
  NUMBER OF      7.   SOLE VOTING POWER
   SHARES                10,800
BENEFICIALLY     --------------------------------------------------------------
  OWNED BY       8.   SHARED VOTING POWER
    EACH                 0
 REPORTING       --------------------------------------------------------------
   PERSON        9.   SOLE DISPOSITIVE POWER
    WITH                 10,800
                 --------------------------------------------------------------
                  10.  SHARED DISPOSITIVE POWER
                         0
-------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        10,800
-------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                            |_|
-------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        0.02%
-------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON
        CO
-------------------------------------------------------------------------------


                               Page 2 of 5 pages





---------------------                                         -----------------
CUSIP NO. Y2711Y104                  13D                      PAGE 3 OF 5 PAGES
---------------------                                         -----------------





-------------------------------------------------------------------------------
 1.  NAME OF REPORTING PERSONS
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

        Leslie Koo
-------------------------------------------------------------------------------
 2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                   (a) |_|
                                                                        (b) |_|
-------------------------------------------------------------------------------
 3.  SEC USE ONLY

-------------------------------------------------------------------------------
 4.  SOURCE OF FUNDS
        PF
-------------------------------------------------------------------------------
5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
   ITEM 2(d) OR 2(e)                                                        |_|
-------------------------------------------------------------------------------
 6.  CITIZENSHIP OR PLACE OF ORGANIZATION
        Taiwan, Republic of China
-------------------------------------------------------------------------------
  NUMBER OF      7.   SOLE VOTING POWER
   SHARES               10,800
BENEFICIALLY     --------------------------------------------------------------
  OWNED BY       8.   SHARED VOTING POWER
    EACH                 0
 REPORTING       --------------------------------------------------------------
   PERSON        9.   SOLE DISPOSITIVE POWER
    WITH                 10,800
                 --------------------------------------------------------------
                 10.  SHARED DISPOSITIVE POWER
                         0
-------------------------------------------------------------------------------
11.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        10,800
-------------------------------------------------------------------------------
12.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                            |_|
-------------------------------------------------------------------------------
13.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
        0.02%
-------------------------------------------------------------------------------
14.  TYPE OF REPORTING PERSON
        IN
-------------------------------------------------------------------------------


                               Page 3 of 5 pages



         Robustos Capital Investments Ltd., a British Virgin Islands corporation
("Robustos"), and Leslie Koo, a citizen of Taiwan, the Republic of China
(Robustos and Leslie Koo are herein after referred to as the "Reporting
Persons"), hereby amend and supplement the statement with respect to the
Ordinary Shares, par value NT$10 per share (the "Ordinary Shares"), of GigaMedia
Limited, a Singapore corporation, (the "Issuer"), beneficially owned by them.
Except as amended and supplemented hereby, the statement on Schedule 13D, as
heretofore amended and supplemented, remains in full force and effect.


Item 5.  Interest in Securities of the Issuer.
         ------------------------------------

         From August 23, 2003 to September 9, 2003, Robustos sold 1,819,971
shares in the Nasdaq National Market.

         As of the date of the filing of this Statement, Robustos beneficially
owns, and Leslie Koo may be deemed to beneficially own through Robustos, 10,800
shares of Ordinary Shares, which represents approximately 0.02% the outstanding
Ordinary Shares based upon 50,154,000 shares of Ordinary Shares reported as
outstanding as of July 15, 2003, in the Issuer's Form 20-F report for the year
ended December 31, 2002.


                               Page 4 of 5 pages.





                                   SIGNATURE

         After reasonable inquiry and to the best of its knowledge and belief,
the undersigned certifies that the information set forth in this statement is
true, complete and correct.



Dated:   September 10, 2003


                                               Robustos Capital Investments Ltd.




                                               By: /s/CHENG-HSIUNG CHIANG
                                                   -----------------------------
                                               Name: Cheng-hsiung Chiang
                                               Title: Director


                                               LESLIE KOO

                                               /s/LESLIE KOO
                                               -------------




                               Page 5 of 5 pages.