X0202 4 2008-05-13 0 0000845072 PECO II INC piii 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 2008-05-13 4 P 0 100 4.05 A 321372 I By Limited Partnership 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) and Special Situations Cayman Fund, L.P. (Cayman), respectively. 218,921shares of Common Stock are held by QP and 102,451 shares of Common Stock are held by Cayman. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP and Cayman is limited to the extent of his pecuniary interest. The total beneficial ownership reflects a 1 for 10 reverse split, which occurred on May 7, 2008 Austin Marxe 2008-05-15 David Greenhouse 2008-05-15