Palo Alto Networks

Palo Alto Networks is one of the few big Silicon Valley companies that put a city's name on the door. That causes some confusion. The company's headquarters is not in Palo Alto. It is in Santa Clara, about 13 miles southeast, on a campus the company opened in 2017. Its roots, though, run straight through the Sand Hill Road investors and the security engineers who worked a few miles from downtown Palo Alto.

This profile sticks to dates from the company's filings and press releases, plus well sourced reporting. Where sources disagree or say nothing, we say so. For the wider list of companies with a Palo Alto chapter, see our companies guide.

Nir Zuk and the founding

Nir Zuk is an Israeli engineer who led software development in Unit 8200, the Israeli military's intelligence technology unit. He was one of the first ten employees at Check Point, the firewall company. He later co-founded OneSecure, which NetScreen bought. He then became NetScreen's chief technology officer before Juniper Networks acquired NetScreen.

Zuk founded Palo Alto Networks in 2005; Wikipedia gives the date as March 1. Rajiv Batra became his co-founder and led engineering. Accounts of the earliest months differ in detail. The Israeli business paper Globes reported that Sequoia Capital's in-house entrepreneur program incubated the idea for about nine months starting in March 2005. Greylock's website says the company started from a desk in Greylock's office. Greylock partner Asheem Chandna, a former Check Point executive, worked with Zuk on the idea. Globes reported that the first investment came in 2006 from Shlomo Kramer, a Check Point co-founder, along with Sequoia and Greylock.

The idea

Firewalls of the early 2000s mostly controlled traffic by port and protocol. As more applications ran over the web, that approach struggled to tell one program from another. Zuk's pitch was a firewall that could identify the actual application, user and content passing through it. The company called this a next-generation firewall. According to its IPO prospectus, it shipped its first products in 2007.

What about the name?

This is the question locals ask most. We could not find an official explanation. The company's prospectus, annual reports and the press releases we checked do not say why it chose the name. None of them place an early office inside Palo Alto city limits. Its earliest backers, Sequoia and Greylock, worked from offices on or near Sand Hill Road in Menlo Park. Zuk lived in a Mountain View apartment in 2005, according to a 2017 Motley Fool profile. Beyond that, any story about the name is guesswork.

What is clear is that the name works as a signal. Palo Alto is shorthand for Silicon Valley around the world, from the HP Garage to Stanford. A security startup in 2005 that wanted to sound established could hardly pick a better word. The city has no connection to the company today beyond the name.

Growth and the 2012 IPO

By the end of January 2012 the company reported more than 6,650 end-customers in more than 80 countries. Its headcount had grown from more than 200 at the end of fiscal 2010 to more than 400 a year later. Mark McLaughlin, who joined as chief executive in 2011, led the company through its public listing.

Palo Alto Networks went public on the New York Stock Exchange on July 20, 2012, raising $260 million. It was one of the larger technology IPOs of that year. Its venture backers included Greylock and Sequoia. Tenaya Capital, the Palo Alto firm that began as Lehman Brothers Venture Partners, also lists the company among its partners' past investments.

By July 31, 2017 the company reported 4,562 employees and more than 42,500 end-customers. In October 2021 it moved its stock listing from the NYSE to Nasdaq, where it still trades as PANW.

Headquarters in Santa Clara

The company's 2012 prospectus lists its principal office at 3300 Olcott Street in Santa Clara. On September 21, 2017 it opened a new headquarters in Santa Clara, describing a campus of nearly one million square feet in four buildings on about 12 acres, with room for up to 5,000 employees. About 2,000 of its more than 4,500 employees worked in Santa Clara at the time. Its fiscal 2017 annual report gives the address as 3000 Tannery Way. That is still the headquarters listed on its website.

Santa Clara is about a 20 minute drive from downtown Palo Alto outside rush hour. Our Santa Clara guide covers the city's mission, stadium and other sights, none of which include this campus. It is a private workplace with no visitor center, tours or public lobby access.

From firewalls to a platform

After the IPO the company expanded well beyond firewalls, largely through acquisitions. Nikesh Arora, a former Google and SoftBank executive, became chairman and chief executive in June 2018 and accelerated that strategy. Its products now fall into three main families: network security, cloud security under the Prisma name and security operations under the Cortex name. Its Unit 42 team publishes threat research and handles incident response.

For its fiscal year ended July 31, 2025 the company reported revenue of about $9.2 billion and roughly 16,000 employees, according to figures summarized from its annual report.

Zuk's later role

Zuk stayed on for many years as chief technology officer and remained the public face of the company's technical strategy. His retirement was announced in August 2025, according to reports at the time; we did not find an effective date in the sources we checked.

Palo Alto connections

Palo Alto Networks is a Santa Clara company, but its story belongs to the same Peninsula network as many companies on this site:

• Investors. Sequoia, Greylock and Tenaya all have pages in our venture capital section. See our Sequoia profile for that firm's history.
• Neighbors in security. Rubrik, a data security company, keeps its headquarters on Deer Creek Road in Stanford Research Park.
• The name. It is one of several companies and organizations that borrow the city's name without being based here.

Frequently asked questions