Pioneer of Next Generation Email Security, IRONSCALES, Closes $15 Million Series B Led by K1; Approaches 1,000 Customers Worldwide

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K1 Investment Management returns to support anti-phishing innovator’s mission to help organizations where email security hurts most, with post-message delivery detection and response.

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IRONSCALES will use the funding to scale its North American sales and marketing teams, while continuing to invest in ongoing research and development of its AI-driven anti-phishing platform.

IRONSCALES, the world’s first automated phishing prevention, detection and response platform, today announced that it has closed a $15 million Series B, led by returning investor K1 Investment Management, the leading investment firm focused on enterprise software. A globally recognized leader in anti-phishing innovation, IRONSCALES will use the funding to scale its North American sales and marketing teams, while continuing to invest in ongoing research and development of its AI-driven anti-phishing platform. In total, IRONSCALES has now raised more than $25 million from K1 and Israel’s RDSeed since 2015.

“While email phishing is the oldest and most recognizable cyberattack technique, it remains an extremely complex problem that today requires the power of both artificial and human intelligence in an ongoing cycle of innovation for it to have any positive effect on an organization’s security posture,” said Eyal Benishti, IRONSCALES founder and CEO. “K1 has always believed in our vision for modernizing email security, and we’re thankful once again for their continued deep operational assistance as IRONSCALES continues to build out our US operations.”

Propelled by a global channel partner program, IRONSCALES has experienced triple-digit revenue growth over the past 12 months. Its award-winning advanced phishing threat protection platform has attracted nearly 1,000 customers across financial services, healthcare, retail, education and other industries. Additionally, its channel program currently boasts more than 50 partners spanning leading resellers, distributors, MSPs and MSSPs around the world. The company employs people in Tel Aviv, across Europe and at its North American headquarters in Atlanta and plans to more than double its headcount in the coming months.

Email security at the mailbox-level
The global email security market is expected to surpass $18 billion by 2023, as businesses of all sizes seek to reduce the inherent cyber risks posed by malicious messages. In recent years, those risks have been amplified due to vulnerabilities spurred by the acceleration of enterprise cloud migration and the proliferation of advanced phishing techniques, such as business email compromise, polymorphism and ransomware, which are built to easily defeat traditional human and technical controls, such as secure email gateways.

“Since we initially partnered with, Eyal and the rest of the team, the company has performed exceptionally, tripled its revenue with US revenue growing more than 10 times in the previous 12 months alone,” said Hasan Askari, Managing Partner at K1. “IRONSCALES’ differentiated method of phishing prevention, detection and remediation has clearly resonated with enterprises. We’re thrilled to continue to support IRONSCALES as the company builds on the impressive momentum that they’ve exhibited over the past few years.”

IRONSCALES hybrid human intelligence (HI) and machine learning solution gives end users and security professionals the right training, tools, and intelligence – all with one-click resolution from a single platform – to hunt, log, alert, analyze, and remediate phishing attacks. To do so, IRONSCALES learns how both users and attackers behave over time to provide constant innovation, giving everyone real-time visibility and real-time control to detect and stop phishing attacks of all types. This decentralized approach makes anti-phishing effortless and seamless, providing security professionals and end users with full protection against all types of phishing threats.

Earlier this year, IRONSCALES released the email security industry’s first anti-phishing mobile app for iOS and Android, empowering security teams to quickly make time-critical decisions from their mobile devices. In 2018, IRONSCALES was awarded the AI-Powered Email Security Innovation Award by Frost & Sullivan and named the Best Enterprise Email Security Solution by the Cybersecurity Breakthrough Awards.

For more information on IRONSCALES, visit and follow @ironscales on Twitter and LinkedIn.

IRONSCALES is the leader in anti-email phishing technologies. Using a multi-layered and automated approach to prevent, detect and respond to today’s sophisticated email phishing attacks, IRONSCALES expedites the time from phishing attack discovery to enterprise-wide remediation from months to seconds, by significantly reducing the workload on incident responders. With headquarters in Tel Aviv and Atlanta, IRONSCALES was founded by a team of security researchers, IT and penetration testing experts, as well as specialists in the field of effective interactive training, in response to the phishing epidemic that today costs companies millions of dollars annually. It was incubated at the 8200 EISP, the top program for cyber security ventures, founded by alumni of the Israel Defense Forces’ elite Intelligence Technology unit.

About K1 Investment Management
K1 builds category leading enterprise software companies. As a global investment firm, K1 assists high-growth businesses achieve successful outcomes. K1 invests alongside strong management teams that continue to guide their organizations on a day-to-day basis. With over 75 professionals, K1 changes industry landscapes by assisting with operationally-focused growth strategies. Since inception of the firm, K1 has partnered with over 100 enterprise software companies including industry leaders such as Apttus, Buildium, Certify, Checkmarx, ChiroTouch, Chrome River, Clarizen, ControlUp, Granicus, IronScales, Jobvite, Onit, Rave, RFPIO, Smarsh and WorkForce Software. For more information about K1, please visit or

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