Nir Zuk has started two companies. The first, OneSecure, was sold to a larger firm. The second, Palo Alto Networks, became one of the largest cybersecurity companies in the world.
Zuk joined Check Point in 1994 and helped build stateful inspection. He moved to the United States for the company in January 1997. After Check Point decided not to release Floodgate, a product his American team had built, he left in March 1999 and founded OneSecure the same month.
OneSecure began as a managed-services business. After the dot-com crash it switched to a product that Zuk calls the first intrusion prevention system. NetScreen bought it in mid-2002, and Juniper later bought NetScreen. At Juniper he asked for ownership of a new firewall project, a $10 million budget and 25 engineers, got no reply for a year, and quit on two weeks' notice.
Palo Alto Networks was incorporated on 1 March 2005 with $9.4 million. It listed on the NYSE on 20 July 2012, raising $260 million, and moved to Nasdaq in October 2021. It bought Expanse for $1.25 billion in 2020 and announced the $25 billion CyberArk deal in 2025, which closed in February 2026. Zuk retired as chief technology officer in August 2025.