0000857005-06-000004 8-K 1 20060221 1.01 2.03 20060227 20060227 PARAMETRIC TECHNOLOGY CORP 0000857005 7372 042866152 MA 0930 8-K 34 000-18059 06647077 140 KENDRICK STREET NEEDHAM MA 02494 7813705000 140 KENDRICK STREET NEEDHAM MA 02494 8-K 1 ptc8k2212006.txt PTC 8-K FEBRUARY 21, 2006