[8] In April 2005, a German court issued a preliminary injunction against Fortinet's UK subsidiary in relation to source code for its GPL-licensed elements.

[13] In August 2009, Fortinet acquired the intellectual property and other assets of Woven Systems, an Ethernet switching company.

[16] In November 2009, Fortinet had an initial public offering, and began trading on the NASDAQ Global Market under the ticker symbol FTNT.

[citation needed] By 2010, Fortinet had $324 million in annual revenues[5] and held the largest share of the unified threat management market according to IDC.

[29] In January 2019, it was announced that Fortinet and founder Ken Xie would participate in the annual World Economic Forum held in Davos, Switzerland.

[30] In September 2019, Fortinet settled a whistleblower lawsuit regarding what the company has described as an "isolated incident" of sales of intentionally mislabeled Chinese-made equipment to U.S. government end users.

[35] In 2020, Fortinet acquired SASE cloud provider OPAQ Networks,[36] and automated incident management company Panopta.

[39] In September 2021, Fortinet pledged to train one million people in support of President Joe Biden's call to action to address the talent shortage in American cybersecurity.

[citation needed] Also in 2022, NetworkWorld reported that Fortinet had introduced new AI and ML-based security services utilizing telemetry from its global network.

[41] In 2023, Fortinet Fortiguard devices were revealed by Microsoft and members of the Five Eyes intelligence network to be the subject of a wide-ranging and ongoing cyberattack by a state-sponsored entity in China.

[45] In September 2024, reports surfaced of an unknown person going by the nickname "Fortibitch" posting to an unnamed "hacking forum" that they allegedly stole 440 gigabytes of data from Fortinet's Microsoft SharePoint server.

Though the International Trade Commission initially ruled against Fortinet,[50] the Trend Micro patents at the center of the dispute were later declared invalid in 2010.

[51] In 2005, an OpenNet study suggested that Myanmar, which was under American sanctions, had begun using Fortinet's FortiGuard system for internet censorship.

[72] In 2015, the CTA published a white paper on the CryptoWall ransomware, which detailed how attackers obtained $325 million through ransoms paid by victims to regain access to their files.

[73] In April 2015, Fortinet provided threat intelligence to Interpol in order to help apprehend the ringleader of several online scams based in Nigeria.

[74] The following year, in March 2016, Fortinet and Cisco joined NATO in a data-sharing agreement to improve their information security capabilities.