X0303 4 2008-06-27 0 0001046501 BUCA INC /MN BUCA 0001044321 MARXE AUSTIN W & GREENHOUSE DAVID M C/O SPECIAL SITUATIONS FUNDS 527 MADISON AVENUE, SUITE 2600 NEW YORK NY 10022 0 0 1 0 Common Stock 2008-06-27 4 S 0 394982 0.39 D 3092000 I By Limited Partnerships This is a joint filing by Austin W. Marxe (Marxe) & David M. Greenhouse (Greenhouse). They share voting & investment control over all securities owned by Special Situations Fund III QP, L.P. (SSFQP), Special Situations Cayman Fund, L.P. (Cay) and Special Situations Private Equity Fund, LP (PE), respectively. 1,681,477 shares of Common Stock are owned by SSFQP, 755,233 shares of Common Stock are owned by Cay and 655,290 shares of Common Stock are owned by PE. The interest of Marxe & Greenhouse in the shares of Common Stock owned by SSFQP, Cay and PE is limited to the extent of his pecuniary interest. Austin W. Marxe 2008-07-01 David M. Greenhouse 2008-07-01