-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, HtV+Oj0K3WdjMcxDgGpWYslL4CLEx/yyBjYXvBbVI3y91iCdLj3LEidbO//h5kBF 6MZvXfYcQvhMz640MNv+MA== 0000891804-06-000571.txt : 20060214 0000891804-06-000571.hdr.sgml : 20060214 20060213202804 ACCESSION NUMBER: 0000891804-06-000571 CONFORMED SUBMISSION TYPE: SC 13G/A PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20060214 DATE AS OF CHANGE: 20060213 GROUP MEMBERS: WAM ACQUISITION GP, INC. SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: MOBILE MINI INC CENTRAL INDEX KEY: 0000911109 STANDARD INDUSTRIAL CLASSIFICATION: FABRICATED PLATE WORK (BOILER SHOPS) [3443] IRS NUMBER: 860210855 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A SEC ACT: 1934 Act SEC FILE NUMBER: 005-48697 FILM NUMBER: 06606271 BUSINESS ADDRESS: STREET 1: 7420 SOUTH KYRENE ROAD STREET 2: SUITE #101 CITY: TEMPE STATE: AZ ZIP: 85283 BUSINESS PHONE: 480-894-6311 MAIL ADDRESS: STREET 1: 7420 SOUTH KYRENE ROAD STREET 2: SUITE #101 CITY: TEMPE STATE: AZ ZIP: 85283 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: COLUMBIA WANGER ASSET MANAGEMENT LP CENTRAL INDEX KEY: 0000908733 STANDARD INDUSTRIAL CLASSIFICATION: UNKNOWN SIC - 0000 [0000] IRS NUMBER: 363820584 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G/A BUSINESS ADDRESS: STREET 1: 227 W MONROE STREET STREET 2: SUITE 3000 CITY: CHICAGO STATE: IL ZIP: 60606 BUSINESS PHONE: 3126349231 MAIL ADDRESS: STREET 1: 227 W MONROE ST STREET 2: STE 3000 CITY: CHICAGO STATE: IL ZIP: 60606 FORMER COMPANY: FORMER CONFORMED NAME: LIBERTY WANGER ASSET MANAGEMENT LP DATE OF NAME CHANGE: 20010220 FORMER COMPANY: FORMER CONFORMED NAME: WANGER ASSET MANAGEMENT LP DATE OF NAME CHANGE: 19990108 SC 13G/A 1 mobile.txt MOBILE MINI, INC. UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5 )* ------ Mobile Mini, Inc. - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock - -------------------------------------------------------------------------------- (Title of Class of Securities) 60740F105 ----------------- (CUSIP Number) December 31, 2005 ----------------------------------------------------- (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 the disclosures provided in a prior cover page. The information required in 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). Page 1 of 10 pages CUSIP No. 60740F105 13G ------------------- - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Columbia Wanger Asset Management, L.P. 04-3519872 - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [_] (b) [_] Not Applicable - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 850,000 ----------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER OWNED BY 0 ----------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING 850,000 ----------------------------------------------------------------- PERSON 8 SHARED DISPOSITIVE POWER WITH 0 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 850,000 - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_] Not Applicable - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 5.6% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IA - -------------------------------------------------------------------------------- Page 2 of 10 pages CUSIP No. 60740F105 13G ------------------- - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON WAM Acquisition GP, Inc. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [_] (b) [_] Not Applicable - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES None ----------------------------------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER OWNED BY 850,000 ----------------------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING None ----------------------------------------------------------------- PERSON 8 SHARED DISPOSITIVE POWER WITH 850,000 - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 850,000 - -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_] Not Applicable - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 5.6% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* CO - -------------------------------------------------------------------------------- Page 3 of 10 pages Item 1(a) Name of Issuer: Mobile Mini, Inc. -------------------------------------------------------------------- Item 1(b) Address of Issuer's Principal Executive Offices: 7420 S. Kyrene Road, Suite 101 Tempe, Arizona 85283 -------------------------------------------------------------------- Item 2(a) Name of Person Filing: Columbia Wanger Asset Management, L.P. ("WAM") WAM Acquisition GP, Inc., the general partner of WAM ("WAM GP") -------------------------------------------------------------------- Item 2(b) Address of Principal Business Office: WAM and WAM GP are located at: 227 West Monroe Street, Suite 3000 Chicago, Illinois 60606 -------------------------------------------------------------------- Item 2(c) Citizenship: WAM is a Delaware limited partnership; WAM GP is a Delaware corporation. -------------------------------------------------------------------- Item 2(d) Title of Class of Securities: Common Stock -------------------------------------------------------------------- Item 2(e) CUSIP Number: 60740F105 -------------------------------------------------------------------- Item 3 Type of Person: (e) WAM is an Investment Adviser registered under section 203 of the Investment Advisers Act of 1940; WAM GP is the General Partner of the Investment Adviser. -------------------------------------------------------------------- Page 4 of 10 pages Item 4 Ownership (at December 31, 2005): (a) Amount owned "beneficially" within the meaning of rule 13d-3: (i) WAM: 850,000 (ii) WAM GP: 850,000 ----------------------------------------------------------------- (b) Percent of class: (i) WAM: 5.6% (ii) WAM GP: 5.6% ----------------------------------------------------------------- (c) Number of shares as to which such person has: (1) sole power to vote or to direct the vote: (i) WAM: 850,000 (ii) WAM GP: 0 (2) shared power to vote or to direct the vote: (i) WAM: 0 (ii) WAM GP: 850,000 (3) sole power to dispose or to direct the disposition of: (i) WAM: 850,000 (ii) WAM GP: 0 (4) shared power to dispose or to direct disposition of: (i) WAM: 0 (ii) WAM GP: 850,000 -------------------------------------------------------------------- Item 5 Ownership of Five Percent or Less of a Class: Not Applicable -------------------------------------------------------------------- Item 6 Ownership of More than Five Percent on Behalf of Another Person: The shares reported herein include the shares held by Columbia Acorn Trust (CAT), a Massachusetts business trust that is advised by WAM, a Delaware limited partnership. CAT holds 5.4% shares of the Issuer's shares. -------------------------------------------------------------------- Page 5 of 10 pages Item 7 Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company: Not Applicable -------------------------------------------------------------------- Item 8 Identification and Classification of Members of the Group: Not Applicable -------------------------------------------------------------------- Item 9 Notice of Dissolution of Group: Not Applicable -------------------------------------------------------------------- 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. Disclaimer In accordance with Rule 13d-4 of the Securities Exchange Act of 1934, each of the persons filing this statement expressly disclaim the beneficial ownership of the securities covered by this statement and the filing of this report shall not be construed as an admission by such persons that they are the beneficial owners of such securities. -------------------------------------------------------------------- Page 6 of 10 pages 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, 2006 The undersigned corporation, on the date above written, agrees and consents to the joint filing on its behalf of this Schedule 13G in connection with its beneficial ownership of the security reported herein. WAM Acquisition GP, Inc. for itself and as general partner of COLUMBIA WANGER ASSET MANAGEMENT, L.P. By: /s/ Bruce H. Lauer --------------------------------------- Bruce H. Lauer Senior Vice President and Secretary Page 7 of 10 pages EXHIBIT INDEX Exhibit 1 Joint Filing Agreement dated as of February 13, 2006 by and among Columbia Wanger Asset Management, L.P., WAM Acquisition GP, Inc. and Columbia Acorn Trust. Page 8 of 10 pages EXHIBIT 1 JOINT FILING AGREEMENT The undersigned hereby agree to the joint filing of the Schedule 13G to which this Agreement is attached. Dated: February 13, 2006 WAM Acquisition GP, Inc. for itself and as general partner of COLUMBIA WANGER ASSET MANAGEMENT, L.P. By: /s/ Bruce H. Lauer --------------------------------------- Bruce H. Lauer Senior Vice President and Secretary COLUMBIA ACORN TRUST By: /s/ Bruce H. Lauer --------------------------------------- Bruce H. Lauer Vice President, Treasurer and Secretary Page 9 of 10 pages -----END PRIVACY-ENHANCED MESSAGE-----