4 2003-04-28 0 0001093691 PLUG POWER INC PLUG 0000064463 MECHANICAL TECHNOLOGY INC 0 0 1 0 Plug Power Inc. - Common Stock 2003-04-28 4 S 0 5000 5.16 D 7463220 D Plug Power Inc. - Common Stock 2003-04-29 4 S 0 12500 5.12 D 7450720 D Plug Power Inc. - Common Stock 2003-04-30 4 S 0 20000 5.11 D 7430720 D Plug Power Inc. - Common Stock 2003-05-01 4 S 0 10000 5 D 7420720 D Mechanical Technology Inc. 2003-05-05