X0202 4 2006-04-12 0 0000903129 AMERIGON INC ARGN 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 2006-04-12 4 S 0 4000 8.025 D 2338019 I By Limited Partnerships This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P. (QP), Special Situations Cayman Fund, L.P. (Cayman), Special Situations Private Equity Fund, LP (PE), Special Situations Technology Fund, L.P. (Tech) and Special Situations Technology II, L.P. (Tech II), respectively. 1,175,996 shares of Common Stock are held by QP, 301,250 shares of Common Stock are held by Cayman, 679,100 shares of Common Stock held by PE, 30,894 shares of Common Stock are held by Tech and 150,779 shares of Common Stock held by Tech II. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP, Cayman, PE, Tech, and Tech II is limited to the extent of his pecuniary interest. Austin W. Marxe 2006-04-13 David M. Greenhouse 2006-04-13