0000912057-01-001592 S-8 4 20010116 20010116 PEGASYSTEMS INC 0001013857 7374 042787865 MA 1231 S-8 33 333-53746 1509431 101 MAIN ST CAMBRIDGE MA 02142-1590 6173749600 101 MAIN ST CAMBRIDGE MA 02142-1590 S-8 1 a2035093zs-8.txt S-8 EX-5.1 2 a2035093zex-5_1.txt EXHIBIT 5.1 EX-23.1 3 a2035093zex-23_1.txt EXHIBIT 23.1 EX-23.2 4 a2035093zex-23_2.txt EXHIBIT 23.2