X0203 3 2008-06-27 0 0000911109 MOBILE MINI INC MINI 0001212992 DENICOLA ANTHONY J C/O WELSH, CARSON, ANDERSON & STOWE 320 PARK AVENUE, SUITE 2500 NEW YORK NY 10022 0 0 1 0 Series A Convert Redeemable Participating Preferred Stock 18.00 Common Stock 6356319.56 I By Welsh, Carson, Anderson & Stowe X, L.P. Series A Convert Redeemable Participating Preferred Stock 18.00 Common Stock 307431 I By WCAS Capital Partners IV, L.P. Series A Convert Redeemable Participating Preferred Stock 18.00 Common Stock 920 I By deNicola Holdings, L.P. The Series A Convertible Redeemable Participating Preferred Stock is immediately convertible into Common Stock and has no expiration date. The Reporting Person is a managing member of the respective sole general partners of Welsh, Carson, Anderson & Stowe X, L.P. and WCAS Capital Partners IV, L.P. Pursuant to Instruction (5)(b)(iv) of Form 3, the Reporting Person has elected to report as indirectly beneficially owned the entire number of securities beneficially owned by each such entity. The Reporting Person disclaims beneficial ownership of any securities, and any proceeds thereof, that exceed his pecuniary interest therein and/or that are not actually distributed to him. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. /s/ David Mintz, Attorney-in-fact 2008-07-02