0000857005-06-000017 8-K 1 20060501 7.01 20060501 20060501 PARAMETRIC TECHNOLOGY CORP 0000857005 7372 042866152 MA 0930 8-K 34 000-18059 06794461 140 KENDRICK STREET NEEDHAM MA 02494 7813705000 140 KENDRICK STREET NEEDHAM MA 02494 8-K 1 ptc8k512006.txt PTC 8-K DATED MAY 1, 2006