================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) (Amendment No. 21) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) The Korea Fund, Inc. -------------------- (Name of Issuer) Common Stock, par value $.01 per share -------------------------------------- (Title of Class of Securities) 500634100 --------- (CUSIP Number) Barry M. Olliff c/o City of London Investment Management Company Limited 10 Eastcheap, London EC3M ILX, England +44 207 711 0771 ---------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) July 31st, 2007 --------------- (Date of Event Which Requires Filing of This Statement) If the 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(e), (f) or (g), check the following box / /. *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 or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act. ================================================================================ (Page 1 of 6 Pages) =================== =========== CUSIP NO. 500634100 13D PAGE 2 of 6 =================== =========== ================================================================================ 1 NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS City of London Investment Group PLC, a company incorporated under the laws of England and Wales. ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) |_| (B) |_| ------------ ------------------------------------------------------------------- 3 SEC USE ONLY ------------ ------------------------------------------------------------------- 4 SOURCE OF FUNDS* OO ------------ ------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E) |_| ------------ ------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION England and Wales -------------------------------------------------------------------------------- NUMBER OF 7 SOLE VOTING POWER SHARES 4,367,034 BENEFICIALLY ------ ------------------------------------------------- OWNED BY 8 SHARED VOTING POWER EACH REPORTING 0 PERSON ------ ------------------------------------------------- WITH 9 SOLE DISPOSITIVE POWER 4,367,034 ------ ------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 ------------ ------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,367,034 ------------ ------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| ------------ ------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 17.99% ------------ ------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* HC ================================================================================ (Page 2 of 6 Pages) =================== =========== CUSIP NO. 500634100 13D PAGE 3 of 6 =================== =========== ================================================================================ 1 NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS City of London Investment Management Company Limited, a company incorporated under the laws of England and Wales. ------------ ------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) |_| (B) |_| ------------ ------------------------------------------------------------------- 3 SEC USE ONLY ------------ ------------------------------------------------------------------- 4 SOURCE OF FUNDS* WC ------------ ------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E) |_| ------------ ------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION England and Wales -------------------------------------------------------------------------------- NUMBER OF 7 SOLE VOTING POWER SHARES 4,367,034 BENEFICIALLY ------ ------------------------------------------------- OWNED BY 8 SHARED VOTING POWER EACH REPORTING 0 PERSON ------ ------------------------------------------------- WITH 9 SOLE DISPOSITIVE POWER 4,367,034 ------ ------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 ------------ ------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,367,034 ------------ ------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| ------------ ------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 17.99% ------------ ------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON* IA ================================================================================ (Page 3 of 6 Pages) This Amendment No. 21 to Schedule 13D (this "Amendment No. 21") should be read in conjunction with the Schedule 13D filed with the U.S. Securities and Exchange Commission (the "SEC") on February 17, 2004 (the "Original Schedule 13D"), with Amendment No. 1 to Schedule 13D filed with the SEC on March 1, 2004 ("Amendment No. 1"), with Amendment No. 2 to Schedule 13D filed with the SEC on May 5, 2004 ("Amendment No. 2"), with Amendment No. 3 to Schedule 13D filed with the SEC on July 8, 2004 ("Amendment No. 3"), with Amendment No. 4 to Schedule 13D filed with the SEC on August 31, 2004 ("Amendment No. 4"), with Amendment No. 5 to Schedule 13D filed with the SEC on November 15, 2004 ("Amendment No. 5"), with Amendment No. 6 to Schedule 13D filed with the SEC on December 23, 2004 ("Amendment No. 6"), with Amendment No. 7 to Schedule 13D filed with the SEC on May 18, 2005 ("Amendment No. 7"), with Amendment No. 8 to Schedule 13D filed with the SEC on June 10, 2005 ("Amendment No. 8"), with Amendment No. 9 to Schedule 13D filed with the SEC on July 5, 2005 ("Amendment No. 9"), with Amendment No. 10 to Schedule 13D filed with the SEC on August 5, 2005 ("Amendment No. 10"), with Amendment No. 11 to Schedule 13D filed with the SEC on August 12, 2005 ("Amendment No. 11"), with Amendment No. 12 to Schedule 13D filed with the SEC on September 14, 2005 ("Amendment No. 12"), with Amendment No. 13 to Schedule 13D filed with the SEC on October 7, 2005 ("Amendment No. 13"), with Amendment No. 14 to Schedule 13D filed with the SEC on October 21, 2005 ("Amendment No. 14"), and with Amendment No. 15 to Schedule 13D filed with the SEC on April 10, 2006 ("Amendment No. 15"), and with Amendment No. 16 to Schedule 13D filed with the SEC on June 9, 2006 ("Amendment No. 16"), and with Amendment No. 17 to Schedule 13D filed with the SEC on October 18, 2006 ("Amendment No. 17"), and with Amendment No. 18 to Schedule 13D filed with the SEC on November 8,2006 ("Amendment No. 18"), and with Amendment No. 19 to Schedule 13D filed with the SEC on December 1 , 2006("Amendment No. 19"), and with Amendment No. 20 to Schedule 13D filed with the SEC on July 9, 2007 ("Amendment No. 20"), and, together with Amendment No. 1, Amendment No. 2, Amendment No. 3, Amendment No. 4, Amendment No. 5, Amendment No. 6, Amendment No. 7, Amendment No. 8, Amendment No. 9. Amendment No. 10, Amendment No. 11, Amendment No. 12, Amendment No. 13, Amendment No. 14, Amendment No. 15, Amendment No. 16, Amendment No. 17, Amendment 18 Amendment No. 19 and, Amendment No. 20 ( the "Amendments"), by City of London Investment Group PLC ("City of London") and City of London Investment Management Company Limited relating to the shares of common stock, par value $0.01 per share (the "Shares"), of The Korea Fund, Inc., a Maryland corporation (the "Fund"). This Amendment No. 21 amends Item 5 of the Original Schedule 13D as amended by the Amendments. All other information in the Original Schedule 13D and the Amendments remains in effect. All capitalized terms used herein and not otherwise defined shall have the meanings ascribed thereto in the Original Schedule 13D as amended by the Amendments. ITEM 5. INTERESTS IN SECURITIES OF THE ISSUER. ------------------------------------- Items 5(a) and 5(b) below are hereby amended and restated in their entirety and Item 5(c) is hereby amended as follows: (Page 4 of 6 Pages) (a) and (b). As of the date hereof, GEM, IEM, EWF, GFM, FREE, CEM and Accounts owned directly 659,207, 728,117, 402,591, 66,911, 717387, 1,020, and 1,791,081 Shares, respectively, representing approximately 2.72%, 3.00%, 1.66%, 0.28%, 2.96%, 0.004% and 7.38%, respectively, of the Shares outstanding (based on the most recent Share information publicly disclosed by the Fund). As of the date hereof, CLIG, through its control of CLIM, is the beneficial owner of 4,367,034 Shares, representing approximately 17.99% of the Shares outstanding (based on the most recent Share information publicly disclosed by the Fund). As of the date hereof, CLIM, through GEM, IEM, EWF, GFM, FREE, CEM and Accounts, is the beneficial owner 4,367,034 Shares, representing approximately 17.99% of the Shares outstanding (based on the most recent Share information publicly disclosed by the Fund). (c). Except as described below, no transactions in the Shares were effected by the Reporting Persons, or, to their knowledge, any of the persons identified in Item 2, in the last 60 days. -------------------------------------------------------------------------------- PORTFOLIO TRADE DATE TRAN TYPE PAR VALUE/SHARES TRADE PRICE -------------------------------------------------------------------------------- ACCOUNT 6/4/2007 SELL 52,010 $40.1612 -------------------------------------------------------------------------------- GFM 6/4/2007 SELL 4,090 $40.1612 -------------------------------------------------------------------------------- ACCOUNT 6/5/2007 SELL 9,100 $39.9018 -------------------------------------------------------------------------------- ACCOUNT 6/6/2007 SELL 48,800 $39.4159 -------------------------------------------------------------------------------- GFM 6/6/2007 SELL 11,000 $39.4159 -------------------------------------------------------------------------------- ACCOUNT 6/7/2007 SELL 12,500 $39.7035 -------------------------------------------------------------------------------- GFM 6/7/2007 SELL 5,900 $39.7035 -------------------------------------------------------------------------------- ACCOUNT 6/8/2007 SELL 113,159 $39.1425 -------------------------------------------------------------------------------- GFM 6/8/2007 SELL 3,741 $39.1425 -------------------------------------------------------------------------------- ACCOUNT 6/13/2007 SELL 27,627 $39.2316 -------------------------------------------------------------------------------- GFM 6/13/2007 SELL 3,100 $39.2316 -------------------------------------------------------------------------------- ACCOUNT 6/15/2007 SELL 6,100 $40.7066 -------------------------------------------------------------------------------- GFM 6/15/2007 SELL 2,900 $40.7066 -------------------------------------------------------------------------------- ACCOUNT 7/9/2007 SELL 11,297 $43.3001 -------------------------------------------------------------------------------- ACCOUNT 7/10/2007 SELL 70,000 $42.7154 -------------------------------------------------------------------------------- ACCOUNT 7/11/2007 SELL 20,000 $42.7021 -------------------------------------------------------------------------------- FREE 7/11/2007 SELL 30,000 $42.7021 -------------------------------------------------------------------------------- ACCOUNT 7/12/2007 SELL 48,766 $43.1703 -------------------------------------------------------------------------------- FREE 7/12/2007 SELL 42,040 $43.1703 -------------------------------------------------------------------------------- GFM 7/12/2007 SELL 14,294 $43.1703 -------------------------------------------------------------------------------- (Page 5 of 6 Pages) -------------------------------------------------------------------------------- ACCOUNT 7/13/2007 SELL 62,500 $44.6057 -------------------------------------------------------------------------------- FREE 7/13/2007 SELL 10,400 $44.6057 -------------------------------------------------------------------------------- GFM 7/13/2007 SELL 13,900 $44.6057 -------------------------------------------------------------------------------- ACCOUNT 7/16/2007 SELL 58,543 $44.0609 -------------------------------------------------------------------------------- FREE 7/16/2007 SELL 9,007 $44.0609 -------------------------------------------------------------------------------- ACCOUNT 7/18/2007 SELL 40,000 $43.2493 -------------------------------------------------------------------------------- GFM 7/18/2007 SELL 10,000 $43.2493 -------------------------------------------------------------------------------- ACCOUNT 7/19/2007 SELL 16,800 $43.6570 -------------------------------------------------------------------------------- ACCOUNT 7/20/2007 SELL 11,900 $44.3492 -------------------------------------------------------------------------------- ACCOUNT 7/23/2007 SELL 83,100 $44.8509 -------------------------------------------------------------------------------- GFM 7/23/2007 SELL 17,000 $44.8509 -------------------------------------------------------------------------------- ACCOUNT 7/24/2007 SELL 46,000 $44.5174 -------------------------------------------------------------------------------- ACCOUNT 7/25/2007 SELL 102,500 $44.6098 -------------------------------------------------------------------------------- ACCOUNT 7/26/2007 SELL 30,400 $43.1619 -------------------------------------------------------------------------------- ACCOUNT 7/30/2007 SELL 90,600 $41.9979 -------------------------------------------------------------------------------- GEM 7/30/2007 SELL 36,200 $41.9979 -------------------------------------------------------------------------------- ACCOUNT 7/31/2007 SELL 39,030 $42.4784 -------------------------------------------------------------------------------- GEM 7/31/2007 SELL 15,400 $42.4784 -------------------------------------------------------------------------------- SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: August 10, 2007 CITY OF LONDON INVESTMENT GROUP PLC /s/ Barry M. Olliff -------------------------- Name: Barry M. Olliff Title: Director CITY OF LONDON INVESTMENT MANAGEMENT COMPANY LIMITED /s/ Barry M. Olliff -------------------------- Name: Barry M. Olliff Title: Director (Page 6 of 6 Pages)