X0202 4 2005-04-06 0 0000903129 AMERIGON INC ARGN 0001044321 MARXE AUSTIN W & GREENHOUSE DAVID M 153 E 53RD ST 55TH FL NEW YORK NY 10022 0 0 1 0 Common Stock 2005-04-06 4 S 0 6400 4.1124 D 2106400 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 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. 644,550 shares of Common Stock are held by Cayman, 1,138,950 shares of Common Stock held by PE, 52,646 shares of Common Stock are held by Tech and 270,254 shares of Common Stock held by Tech II. The interest of Marxe and Greenhouse in the shares of Common Stock owned by Cayman, PE, Tech, and Tech II is limited to the extent of his pecuniary interest. Austin W. Marxe 2005-04-08 David M. Greenhouse 2005-04-08