SC 13G 1 aescorp.txt AES CORPORATION Securities and Exchange Commission Washington, D. C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No. __) AES Corporation Common Stock CUSIP Number 00130H105 Date of Event Which Requires Filing of this Statement: December 31, 2003 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [ X ] Rule 13d-1(b) [ ] Rule 13d-1(c) [ ] Rule 13d-1(d) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - CUSIP No. 00130H105 1) Name of reporting person: Legg Mason Funds Management, Inc. Tax Identification No.: 52-2268681 2) Check the appropriate box if a member of a group: a) x b) n/a 3) SEC use only 4) Place of organization: Maryland Number of shares beneficially owned by each reporting person with: 5) Sole voting power: - 0 - 6) Shared voting power: 67,560,698 7) Sole dispositive power: - 0 - 8) Shared dispositive power: 67,560,698 9) Aggregate amount beneficially owned by each reporting person: 67,560,698 10) Check if the aggregate amount in row (9) excludes certain shares n/a 11) Percent of class represented by amount in row (9): 10.85% 12) Type of reporting person: IA, CO CUSIP No. 00130H105 1) Name of reporting person: Legg Mason Capital Management, Inc. Tax Identification No.: 52-1268629 2) Check the appropriate box if a member of a group: a) x b) n/a 3) SEC use only 4) Place of organization: Maryland Number of shares beneficially owned by each reporting person with: 5) Sole voting power: - 0 - 6) Shared voting power: 34,694,400 7) Sole dispositive power: - 0 - 8) Shared dispositive power: 34,694,400 9) Aggregate amount beneficially owned by each reporting person: 34,694,400 10) Check if the aggregate amount in row (9) excludes certain shares n/a 11) Percent of class represented by amount in row (9): 5.57% 12) Type of reporting person: IA, CO CUSIP No. 00130H105 1) Name of reporting person: LMM, LLC Tax Identification No.: 52-2204753 2) Check the appropriate box if a member of a group: a) x b) n/a 3) SEC use only 4) Place of organization: Maryland Number of shares beneficially owned by each reporting person with: 5) Sole voting power: - 0 - 6) Shared voting power: 8,000,000 7) Sole dispositive power: - 0 - 8) Shared dispositive power: 8,000,000 9) Aggregate amount beneficially owned by each reporting person: 8,000,000 10) Check if the aggregate amount in row (9) excludes certain shares n/a 11) Percent of class represented by amount in row (9): 1.28% 12) Type of reporting person: IA, OO CUSIP No. 00130H105 1) Name of reporting person: Legg Mason Value Trust, Inc. Tax Identification No.: 52-1250327 2) Check the appropriate box if a member of a group: a) n/a b) n/a 3) SEC use only 4) Place of organization: Maryland Number of shares beneficially owned by each reporting person with: 5) Sole voting power: - 0 - 6) Shared voting power: 51,200,000 7) Sole dispositive power - 0 - 8) Shared dispositive power: 51,200,000 9) Aggregate amount beneficially owned by each reporting person 51,200,000 10) Check if the aggregate amount in row (9) excludes certain shares n/a 11) Percent of class represented by amount in row (9): 8.22% 12) Type of reporting person: IV, CO - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Item 1a) Name of issuer: AES Corporation Item 1b) Address of issuer's principal executive offices: 1001 N. 19th Street Arlington, VA 22209 Item 2a) Name of person filing: Legg Mason Funds Management, Inc. Legg Mason Capital Management, Inc. LMM, LLC Item 2b) Address of principal business office: 100 Light Street Baltimore, MD 21202 Item 2c) Citizenship: Legg Mason Funds Management, Inc. Maryland corporation Legg Mason Capital Management, Inc. Maryland corporation LMM, LLC Maryland limited liability company Item 2d) Title of class of securities: Common Stock Item 2e) CUSIP number: 00130H105 Item 3) If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b), check whether the person filing is a: (a)[ ] Broker or dealer under Section 15 of the Act. (b)[ ] Bank as defined in Section 3(a)(6) of the Act. (c)[ ] Insurance Company as defined in Section 3(a)(6) of the Act. (d)[ ] Investment Company registered under Section 8 of the Investment Company Act. (e)[ ] Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940. (f)[ ] Employee Benefit Plan, Pension Fund which is subject to ERISA of 1974 or Endowment Funds; see 240.13d-1(b)(ii)(F). (g)[ ] Parent holding company, in accordance with 240.13d-1(b)(ii)(G), (h)[X] Group, in accordance with 240.13d-1(b)(1)(ii)(J). Item 4) Ownership: (a) Amount beneficially owned: 110,255,098 (b) Percent of Class: 17.71% (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: - 0 - (ii) shared power to vote or to direct the vote: 110,255,098 (iii) sole power to dispose or to direct the disposition of: - 0 - (iv) shared power to dispose or to direct the disposition of 110,255,098 Item 5) Ownership of Five Percent or less of a class: n/a Item 6) Ownership of more than Five Percent on behalf of another person: Various accounts managed by the investment advisers identified in Item 8 have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of shares of the issuer. The interest of one account, Legg Mason Value Trust, Inc., an investment company registered under the Investment Company Act of 1940 and managed by Legg Mason Funds Management, Inc., amounted to 51,200,000 shares or 8.22% of the total shares outstanding. Item 7) Identification and classification of the subsidiary which acquired the security being reported on by the parent holding company: n/a Item 8) Identification and classification of members of the group: Legg Mason Funds Management, Inc.-investment adviser Legg Mason Capital Management, Inc.-investment adviser LMM, LLC-investment adviser Item 9) Notice of dissolution of group: n/a Item 10) Certification: By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. 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. -------------------------------- Date - February 13, 2004 Legg Mason Funds Management, Inc. By___________________________________________ Jennifer Murphy, Senior Vice President Legg Mason Capital Management, Inc. By___________________________________________ Andrew J. Bowden, Senior Vice President LMM, LLC By____________________________________________ Jennifer Murphy, Chief Operations Officer Exhibit A Joint Filing Agreement -------------------------------------- This Joint Filing Agreement confirms the agreement by and among the undersigned that the Schedule 13G is filed on behalf of (i) each member of the group identified in Item 8 and (ii) the other reporting person(s) identified in Item 6 that may be deemed to beneficially own more than five percent of the issue's outstanding equity securities. Legg Mason Funds Management, Inc. By__________________________________________________ Jennifer Murphy, Senior Vice President Legg Mason Capital Management, Inc. By__________________________________________________ Andrew J. Bowden, Senior Vice President LMM, LLC By__________________________________________________ Jennifer Murphy, Chief Operations Officer Legg Mason Value Trust, Inc. By___________________________________________________ Gregory T. Merz, Vice President