Securities and Exchange Commission Washington, D. C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No. __) INTERPUBLIC GROUP OF COS Common Stock CUSIP Number 460690100 Date of Event Which Requires Filing of this Statement: December 31, 2005 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. 460690100 1) Name of reporting person: CAM North America, LLC Tax Identification No.: 01-0846058 2) Check the appropriate box if a member of a group: a) x b) n/a 3) SEC use only 4) Place of organization: DE Number of shares beneficially owned by each reporting person with: 5) Sole voting power: - 0 - 6) Shared voting power: 12,927,673 7) Sole dispositive power: - 0 - 8) Shared dispositive power:16,888,029 9) Aggregate amount beneficially owned by each reporting person: 16,888,029 10) Check if the aggregate amount in row (9) excludes certain shares: n/a 11) Percent of class represented by amount in row (9): 3.92% 12) Type of reporting person: IA CUSIP No. 460690100 1) Name of reporting person: Salomon Brothers Asset Management Inc Tax Identification No.: 13-3440564 2) Check the appropriate box if a member of a group: a) x b) n/a 3) SEC use only 4) Place of organization: DE Number of shares beneficially owned by each reporting person with: 5) Sole voting power: - 0 - 6) Shared voting power: 851,599 7) Sole dispositive power: - 0 - 8) Shared dispositive power:851,599 9) Aggregate amount beneficially owned by each reporting person: 851,599 10) Check if the aggregate amount in row (9) excludes certain shares: n/a 11) Percent of class represented by amount in row (9): 0.20% 12) Type of reporting person: IA CUSIP No. 460690100 1) Name of reporting person: Smith Barney Fund Management LLC Tax Identification No.: 13-2616913 2) Check the appropriate box if a member of a group: a) x b) n/a 3) SEC use only 4) Place of organization: DE Number of shares beneficially owned by each reporting person with: 5) Sole voting power: - 0 - 6) Shared voting power: 10,137,693 7) Sole dispositive power: - 0 - 8) Shared dispositive power:10,137,693 9) Aggregate amount beneficially owned by each reporting person: 10,137,693 10) Check if the aggregate amount in row (9) excludes certain shares: n/a 11) Percent of class represented by amount in row (9): 2.35% 12) Type of reporting person: IA CUSIP No. 460690100 1) Name of reporting person: TIMCO Asset Management Inc. Tax Identification No.: 06-0840914 2) Check the appropriate box if a member of a group: a) x b) n/a 3) SEC use only 4) Place of organization: CT Number of shares beneficially owned by each reporting person with: 5) Sole voting power: - 0 - 6) Shared voting power: 81,342 7) Sole dispositive power: - 0 - 8) Shared dispositive power:81,342 9) Aggregate amount beneficially owned by each reporting person: 81,342 10) Check if the aggregate amount in row (9) excludes certain shares: n/a 11) Percent of class represented by amount in row (9): 0.02% 12) Type of reporting person: IA - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Item 1a) Name of issuer: INTERPUBLIC GROUP OF COS Item 1b) Address of issuer's principal executive offices: 1114 Avenue of the Americas 19th Floor New York, NY 10036 Item 2a) Name of person filing: CAM North America, LLC Salomon Brothers Asset Management Inc Smith Barney Fund Management LLC TIMCO Asset Management Inc. Item 2b) Address of principal business office: 399 Park Avenue New York, NY 10022 Item 2c) Citizenship: CAM North America, LLC A Delaware Limited Liability Corporation Salomon Brothers Asset Management Inc A Delaware Corporation Smith Barney Fund Management LLC A Delaware Limited Liability Corporation TIMCO Asset Management Inc. A Connecticut Corporation Item 2d) Title of class of securities: Common Stock Item 2e) CUSIP number: 460690100 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: 27,958,663 (b) Percent of Class: 6.49% (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: 23,998,307 (iii) sole power to dispose or to direct the disposition of: - 0 - (iv) shared power to dispose or to direct the disposition of: 27,958,663 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: n/a 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: CAM North America, LLC Salomon Brothers Asset Management Inc Smith Barney Fund Management LLC TIMCO Asset Management Inc. 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 14, 2006 CAM North America, LLC By: /s/ George Shively George Shively, Secretary Salomon Brothers Asset Management Inc By: /s/ George Shively George Shively, Secretary Smith Barney Fund Management LLC By: /s/ Thomas C. Mandia Thomas C. Mandia, Secretary TIMCO Asset Management Inc. By: /s/ George Shively George Shively, Secretary 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 issuer's outstanding equity securities. CAM North America, LLC By: /s/ George Shively George Shively, Secretary Salomon Brothers Asset Management Inc By: /s/ George Shively George Shively, Secretary Smith Barney Fund Management LLC By: /s/ Thomas C. Mandia Thomas C. Mandia, Secretary TIMCO Asset Management Inc. By: /s/ George Shively George Shively, Secretary