X0303 4/A 2010-10-29 2010-11-01 0 0000857005 PARAMETRIC TECHNOLOGY CORP PMTC 0001186556 HARRISON C RICHARD 140 KENDRICK STREET NEEDHAM MA 02494 1 1 0 0 Executive Chairman Common Stock 2010-10-29 4 S 0 312046 21.4131 D 985058 D Employee Stock Option (right to buy) 12.5750 2011-09-20 Common Stock 7954 7954 D This amendment to Form 4 is being filed to note that the shares sold were sold pursuant to a pre-established Rule 10b5-1(c ) trading plan. This information is unchanged and is repeated as the information is required to file the form. Employee stock option granted September 20, 2001, exercisable as to 80,000 shares on September 20, 2002, 79,999 shares on September 20, 2003, 79,999 shares on September 20, 2004 and 80,000 shares on September 20, 2005. This amendment to Form 4 is being filed to report the correct total number of derivative securities beneficially owned of the class shown. Catherine Gorecki by power of attorney filed 11/2/2007 2010-11-02