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) April 25, 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 JKK Inc. -------------------------------------------------------------------------------- 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 0 BENEFICIALLY ------------------------------------------------------------------- OWNED BY 8. SHARED VOTING POWER EACH 3,787,271* REPORTING ------------------------------------------------------------------- PERSON 9. SOLE DISPOSITIVE POWER WITH 0 ------------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 3,787,271* -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,787,271* -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 7.55 % -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO -------------------------------------------------------------------------------- *Including 100,000 employee share options ------------------- ----------------- 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 0 BENEFICIALLY ------------------------------------------------------------------- OWNED BY 8. SHARED VOTING POWER EACH 3,787,271* REPORTING ------------------------------------------------------------------- PERSON 9. SOLE DISPOSITIVE POWER WITH 0 ------------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 3,787,271* -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,787,271* -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 7.55 % -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN -------------------------------------------------------------------------------- *Including 100,000 employee share options JKK Inc., a British Virgin Islands corporation ("JKK"), and Leslie Koo, a citizen of Taiwan, the Republic of China (JKK and Leslie Koo are herein after referred to as the "Reporting Persons"), hereby amend and supplement the statement on Schedule 13D previously filed by them, 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 April 1, 2003 to April 24, 2003, JKK sold 1,374,445 shares in the Nasdaq National Market. As of the date of the filing of this Statement, JKK beneficially owns, and Leslie Koo may be deemed to beneficially own through JKK, 3,787,271 shares of Ordinary Shares, which represents approximately 7.55 % the outstanding Ordinary Shares based upon 50,154,000 shares of Ordinary Shares reported as outstanding as of June 30, 2002, in the Issuer's Form 20-F Report for the year ended December 31, 2001. Leslie Koo, a director of Issuer, holds options to purchase 100,000 of these shares at $24.3 per share. 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: April 25, 2003 JKK INC. By: /s/ Gwo-yeu Tsai ---------------- Name: Gwo-yeu Tsai Title: Director LESLIE KOO /s/ Leslie Koo -------------- Page 5 of 5 pages.