0000950146-96-002117 S-1 7 19961120 NASD PEGASYSTEMS INC 0001013857 7374 1231 S-1 33 333-16475 96669869 101 MAIN ST CAMBRIDGE MA 02142-1590 6173749600 101 MAIN ST CAMBRIDGE MA 02142-1590 S-1 1 000095014696002117-001-seq1-s-1.txt REGISTRATION STATEMENT EX-1 2 000095014696002117-002-seq2-ex-1.txt UNDERWRITING AGREEMENT EX-5.1 3 000095014696002117-003-seq3-ex-5-1.txt OPINION OF CHOATE, HALL & STEWART EX-23.1 4 000095014696002117-004-seq4-ex-23-1.txt CONSENTS OF EXPERTS AND COUNSEL EX-23.6 5 000095014696002117-005-seq5-ex-23-6.txt CONSENT OF THE ABERDEEN GROUP EX-27.1 6 000095014696002117-006-seq6-ex-27-1.txt ARTICLE 5 OF FDS FOR 3RD QUARTER OF 10-Q EX-99.1 7 000095014696002117-007-seq7-ex-99-1.txt VALUATION AND QUALIFYING ACCOUNTS