Securities and Exchange Commission Washington, D. C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No. 1) MGIC Investment Corporation Common Stock CUSIP Number 552848103 Date of Event Which Requires Filing of this Statement: December 31, 2001 CUSIP No. 552848103 1) Name of reporting person: Legg Mason, Inc. Tax Identification No.: 52-1200960 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: 14,665,831 7) Sole dispositive power: - 0 - 8) Shared dispositive power: 14,665,831 9) Aggregate amount beneficially owned by each reporting person: 14,665,831 10) Check if the aggregate amount in row (9) excludes certain shares: n/a 11) Percent of class represented by amount in row (9): 13.68% 12) Type of reporting person: HC, CO ____________________________________________________________________ Item 1a) Name of issuer: MGIC Investment Corporation Item 1b) Address of issuer's principal executive offices: MGIC Plaza 250 E. Kilbourn Avenue Milwaukee, WI 53202 Item 2a) Name of person filing: Legg Mason, Inc. Item 2b) Address of principal business office: 100 Light Street Baltimore, MD 21202 Item 2c) Citizenship: Maryland Corporation Item 2d) Title of class of securities: Common Stock Item 2e) CUSIP number: 552848103 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 Fund; see 240.13d-1(b)(ii)(F). (g) [ X ] Parent holding company, in accordance with 240.13d-1(b)(ii)(G). (h) [ ] Group, in accordance with 240.13d-1(b)(1)(ii)(H Item 4) Ownership: (a) Amount beneficially owned: 14,665,831 (b) Percent of Class: 13.68% (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: 14,665,831 (iii) sole power to dispose or to direct the disposition of: - 0 - (iv) shared power to dispose or to direct the disposition of: 14,665,831 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 advisory subsidiaries described in Item 7 have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of shares of MGIC Investment Corporation. Accounts managed by Legg Mason Funds Management, Inc. in the aggregate, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, 9,562,921 shares, or 8.92%, of the total shares outstanding of MGIC Investment Corporation. 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 8,533,700 shares or 7.96% 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: Legg Mason Funds Management, Inc., investment adviser Bartlett & Co., investment adviser Brandywine Asset Management, LLC, investment adviser Legg Mason Capital Management, Inc., investment adviser Legg Mason Wood Walker, Inc., investment adviser and broker/dealer with discretion Perigee Investment Counsel, Inc., investment adviser Batterymarch Financial Management, Inc., investment adviser Item 8) Identification and classification of members of the group: n/a 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 11, 2002 Legg Mason, Inc. By _____________________________________________________ Timothy C. Scheve, Sr. Ex. Vice President Joint Filing Agreement --------------------------- Each party signing below agrees that this statement is submitted as a joint filing on behalf of all of the undersigned. Legg Mason, Inc. By _____________________________________________ Timothy C. Scheve, Sr. Ex. Vice President Legg Mason Funds Management, Inc. By______________________________________________ Jennifer Murphy, Sr. Vice President Legg Mason Value Trust, Inc. By_____________________________________________ Marc R. Duffy, Vice President