UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3) American CareSource Holdings, Inc. (Name of Issuer) Common Stock (Title and Class of Securities) 02505A103 (CUSIP Number) December 31, 2008 (Date of Event which Requires Filing of this Statement) 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) *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). CUSIP No. 02505A103 Page 2 1 NAMES OF REPORTING PERSONS Principal Life Insurance Company 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) (b) 3 SEC USE ONLY 4 CITIZENSHIP OR PLACE OF ORGANIZATION Iowa NUMBER OF 5 SOLE VOTING POWER 0 SHARES BENEFICIALLY 6 SHARED VOTING POWER 1,691,065 OWNED BY EACH 7 SOLE DISPOSITIVE POWER 0 REPORTING PERSON WITH 8 SHARED DISPOSITIVE POWER 1,691,065 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,691,065 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (See Instructions) 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 11.10 12 TYPE OF REPORTING PERSON (See Instructions) IC CUSIP No. 02505A103 Page 3 1 NAMES OF REPORTING PERSONS Principal Financial Group, Inc. 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) (b) 3 SEC USE ONLY 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF 5 SOLE VOTING POWER 0 SHARES BENEFICIALLY 6 SHARED VOTING POWER 1,691,065 OWNED BY EACH 7 SOLE DISPOSITIVE POWER 0 REPORTING PERSON WITH 8 SHARED DISPOSITIVE POWER 1,691,065 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,691,065 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (See Instructions) 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 11.10 12 TYPE OF REPORTING PERSON (See Instructions) HC CUSIP No. 02505A103 Page 4 Item 1(a). Name of Issuer: American CareSource Holdings, Inc. Item 1(b). Address of Issuer's Principal Executive Offices: 5429 Lyndon B. Johnson Freeway Suite 700 Dallas, TX 75240 Item 2(a). Name of Person Filing: By virtue of its ultimate ownership and control of Principal Life Insurance Company (PLIC), Principal Financial Group, Inc. (PFG) has the ultimate voting and dispositive power with respect to the shares of American CareSource Holdings Common Stock held by PLIC and may be deemed indirect beneficial owners of all the shares of American CareSource Holdings Common Stock owned by PLIC within the meaning of Rule 13d-3(a) under the Securities Exchange Act of 1934, as amended (the Act). Item 2(b). Address of Principal Business Office, or, if None, Residence: Principal Life Insurance Company 711 High Street Des Moines, IA 50392-0088 Principal Financial Group, Inc. 711 High Street Des Moines, IA 50392-0088 Item 2(c). Citizenship: Principal Life Insurance Company - State of Iowa Principal Financial Group, Inc. - State of Delaware Item 2(d). Title of Class of Securities: Common Stock Item 2(e). CUSIP Numbers: 02505A103 Item 3. If this statement is filed pursuant to section 240.13d- 1(b) or 240.13d 2(b) or (c), check whether the person filing is a: (c) [X] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c) (g) [X] A parent holding company or control person in accordance with section 240.13d-1(b)(1)(ii)(G) Item 4. Ownership: (a) Amount Beneficially Owned 1,691,065 Shares Common Stock presently held by Principal Life Insurance Company 1,691,065 Shares Common Stock presently held by Principal Financial Group, Inc. CUSIP No. 02505A103 Page 5 (b) Percent of Class 11.10 Principal Life Insurance Company 11.10 Principal Financial Group, Inc. (c) Number of shares as to which the person has: (i) Sole Power to Vote or Direct the Vote 0 Principal Life Insurance Company 0 Principal Financial Group, Inc. (ii) Shared Power to Vote or Direct the Vote 1,691,065 Shares Common Stock presently held by Principal Life Insurance Company 1,691,065 Shares Common Stock presently held by Principal Financial Group, Inc. (iii) Sole Power to Dispose or to Direct the Disposition of 0 Principal Life Insurance Company 0 Principal Financial Group, Inc. (iv) Shared Power to Dispose or to Direct the Disposition of 1,691,065 Shares Common Stock presently held by Principal Life Insurance Company 1,691,065 Shares Common Stock presently held by Principal Financial Group, Inc. Item 5. Ownership of Five Percent or Less of a Class: [ ] Item 6. Ownership of More than Five Percent on Behalf of Another Person Not applicable Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company See exhibit attached CUSIP No. 02505A103 Page 6 Item 8. Identification and Classification of Members of the Group Not applicable Item 9. Notice of Dissolution of Group Not applicable Item 10(a). Certification By signing below I certify, 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. Principal Life Insurance Company By /s/ Joyce Hoffman Joyce Hoffman, Senior Vice President and Corporate Secretary Principal Financial Group, Inc. By /s/ Joyce N. Hoffman Joyce N. Hoffman, Senior Vice President and Corporate Secretary Dated March 9, 2009 EXHIBIT 99.1 Principal Life Insurance Company Item 3 Classification: (c) [X] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c) Principal Financial Group, Inc. Item 3 Classification: (g) A parent holding company or control person in accordance with section 240.13d-1(b)(1)(ii)(G)