SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of l934 (Amendment No. )/1/ mobile mini(R), inc. -------------------- (Name of Issuer) Common Stock, $0.01 par value ---------------------------- (Title of Class of Securities) 60740F105 --------- (CUSIP Number) December 31, 2003 ----------------- (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) /1/ 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).

CUSIP No. 60740F105 1) Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (Entities Only) TimesSquare Capital Management, Inc. 06-0861092 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 (5) Sole Voting Power 0 Number of ------------------------------------------------------------ Shares Beneficially (6) Shared Voting Power 899,400 Owned ------------------------------------------------------------ By Each Reporting (7) Sole Dispositive Power 0 Person ------------------------------------------------------------ With (8) Shared Dispositive Power 899,400 9) Aggregate Amount Beneficially Owned by Each Reporting Person 899,400 10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] 11) Percent of Class Represented by Amount in Row 9 6.3% 12) Type of Reporting Person (See Instructions) IA

CUSIP No. 60740F105 1) Names of Reporting Persons I.R.S. Identification Nos. of Above Persons (Entities Only) CIGNA Corporation 06-1059331 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 (5) Sole Voting Power 0 Number of ------------------------------------------------------------ Shares Beneficially (6) Shared Voting Power 899,400 Owned ------------------------------------------------------------ by Each Reporting (7) Sole Dispositive Power 0 Person ------------------------------------------------------------ With (8) Shared Dispositive Power 899,400 9) Aggregate Amount Beneficially Owned by Each Reporting Person 899,400 10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] 11) Percent of Class Represented by Amount in Row 9 6.3% 12) Type of Reporting Person (See Instructions) HC

Item l(a) Name of Issuer: mobile mini(R), inc. Item l(b) Address of Issuer's Principal Executive Offices: 7420 S. Kyrene Road, Suite 101 Tempe, AZ 85283 Item 2(a) Name of Persons Filing: TimesSquare Capital Management, Inc. ("TimesSquare") CIGNA Corporation ("CIGNA") This statement is filed on behalf of each of TimesSquare and CIGNA pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended. Item 2(b) Address of Principal Business Office or, if none, Residence: TimesSquare: Four Times Square, 25th Floor New York, NY 10036 CIGNA: One Liberty Place Philadelphia, PA 19192 Item 2(c) Citizenship: TimesSquare and CIGNA are both Delaware corporations. Item 2(d) Title of Class of Securities: Common Stock, $0.01 par value Item 2(e) CUSIP Number: 60740F105 Item 3 This statement is filed by TimesSquare pursuant to sections 240.l3d-l(b), or 240.13d-2(b) or (c), on the basis that TimesSquare is an investment adviser in accordance with section 240.13d-1(b)(1)(ii)(E). This statement is filed by CIGNA pursuant to sections 240.13d-1(b), or 240.13d-2(b) or (c), on the basis that CIGNA is a parent holding company or control person in accordance with section 240.13d-1(b)(1)(ii)(G). Item 4 Ownership. The following ownership information is as of December 31, 2003. (a) Amount Beneficially Owned: 899,400 shares* (b) Percent of Class: 6.3%* Percent of class is based on 14,348,494 shares of Common Stock outstanding as of November 7, 2003 as reported in the Issuer's Form 10-Q for the quarterly period ended September 30, 2003 filed with the Securities and Exchange Commission on November 14, 2003.

(c) Number of shares as to which the person has: (i) sole power to vote or to direct the vote 0 (ii) shared power to vote or to direct the vote 899,400* (iii) sole power to dispose or to direct the disposition of 0 (iv) shared power to dispose or to direct the disposition of 899,400* * All of the shares reported on in this statement are owned by investment advisory clients of TimesSquare. In its role as investment adviser, TimesSquare has voting and dispositive power with respect to these shares. As the ultimate parent company of TimesSquare, CIGNA may be deemed to beneficially own, and to share voting and dispositive power with respect to, the 899,400 shares that may be deemed to be beneficially owned by TimesSquare. Item 5 Ownership of Five Percent or Less of a Class. If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ]. Not applicable Item 6 Ownership of More than Five Percent on Behalf of Another Person. The shares of Common Stock reported on in this statement are owned by investment advisory clients of TimesSquare, and such clients have the right to receive dividends from and proceeds from the sale of such shares. To TimesSquare's knowledge, the interest of no one of these clients relates to more than 5% of the class. Item 7 Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person. TimesSquare (Item 3 classification IA) is the subsidiary which may be deemed to have acquired beneficial ownership of the shares of the Issuer's Common Stock that are being reported on by CIGNA, the parent holding company. Item 8 Identification and Classification of Members of the Group. Not applicable. Item 9 Notice of Dissolution of Group. Not applicable.

Item l0 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: January 27, 2004 TIMESSQUARE CAPITAL MANAGEMENT, INC. Signature: /s/ Timothy F. Roberts ---------------------------------------------------------- Name/Title: Timothy F. Roberts Vice President and Compliance Officer CIGNA CORPORATION Signature: /s/ Kathryn Pietrowiak ---------------------------------------------------------- Name/Title: Kathryn Pietrowiak Assistant Corporate Secretary

EXHIBIT 1 TO SCHEDULE 13G JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13G (including amendments thereto) with respect to the Common Stock, $0.01 par value, of mobile mini(R), inc., and further agree that this Joint Filing Agreement be included as an exhibit to such joint filing. In evidence thereof, the undersigned being duly authorized, hereby execute this Agreement this 27th day of January 2004. TIMESSQUARE CAPITAL MANAGEMENT, INC. By: /s/ Timothy F. Roberts --------------------------------------------- Name: Timothy F. Roberts Title: Vice President and Compliance Officer CIGNA CORPORATION By: /s/ Kathryn Pietrowiak --------------------------------------------- Name: Kathryn Pietrowiak Title: Assistant Corporate Secretary