X0201 4 2004-04-12 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 2004-04-12 4 S 0 1000 5.573 D 2404800 I By Limited Parternships Common Stock 2004-04-13 4 S 0 25000 5.45 D 2379800 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. 475,200 shares of Common Stock and 264,050 Wts are held by Cayman, 836,300 shares of Common Stock and 434,750 Wts are held by PE, 38,137 shares of Common Stock and 22,878 Wts are held by Tech and 191,563 shares of Common Stock and 116,922 Wts are 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 2004-04-14 David M. Greenhouse 2004-04-14