0001047469-07-009531 S-1/A 8 20071127 20071127 PROS Holdings, Inc. 0001392972 7371 760168604 DE 1231 S-1/A 33 333-147398 071267812 3100 MAIN STREET SUITE 900 HOUSTON TX 77002 713-335-5151 3100 MAIN STREET SUITE 900 HOUSTON TX 77002 S-1/A 1 a2181387zs-1a.htm S-1/A EX-1.1 2 a2181387zex-1_1.htm EXHIBIT 1.1 EX-5.1 3 a2181387zex-5_1.htm EXHIBIT 5.1 EX-23.1 4 a2181387zex-23_1.htm EXHIBIT 23.1 GRAPHIC 5 g25386.jpg G25386.JPG GRAPHIC 6 g314443.jpg G314443.JPG GRAPHIC 7 g664252.jpg G664252.JPG GRAPHIC 8 g403374.jpg G403374.JPG