Palo Alto Networks (PANW) started trading on the NYSE on July 20, 2012

Palo Alto Networks Inc. of Santa Clara, Calif. — also had a successful IPO this week. The enterprise software maker priced its initial public offering shares at $42 on Thursday, raising $260 million. Trading under the symbol PANW, its shares closed at $53.13 on Friday, 26 percent over the initial price.