0001222572-05-000013 4 1 20050215 20050217 20050217 PEGASYSTEMS INC 0001013857 7374 042787865 MA 1231 101 MAIN ST CAMBRIDGE MA 02142-1590 6173749600 101 MAIN ST CAMBRIDGE MA 02142-1590 DARBELOFF ALEXANDER V 0001222572 4 34 001-11859 05622872 C/O PEGASYSTEMS INC 101 MAIN STREET CAMBRIDGE MA 02142 4 1 primary_doc.xml PRIMARY DOCUMENT