Palo Alto Networks Negotiates $400M Acquisition of Koi Security

Palo Alto Networks is in negotiations to acquire Israeli endpoint security startup Koi Security for approximately $400 million. Although the agreement is not finalized, both parties have signed a preliminary memorandum of understanding, indicating a serious commitment to the deal.

A New Chapter After Leadership Changes

If the acquisition proceeds, it will mark Palo Alto Networks’ first purchase of an Israeli company since Nir Zuk stepped down as chief technology officer last year. This timing suggests a renewed interest in leveraging Israel’s extensive cybersecurity expertise. Koi Security has demonstrated remarkable capital efficiency, having raised only $48 million across two funding rounds but now positioned for a substantial exit.

Such a deal would yield considerable returns not only for the founders—Amit Assaraf, Idan Dardikman, and Itay Kruk—but also for early investors including Battery Ventures, NFX, Team8, and Picture Capital, as well as a fund supported by seasoned cybersecurity executives.

Addressing Security Challenges in Software Supply Chains

Koi Security’s technology addresses a significant vulnerability in enterprise security: the risks associated with third-party applications and developer extensions. Over the past two years, Koi’s founding team has developed a scanning engine capable of detecting malware and hidden vulnerabilities before they can infiltrate organizations.

This innovative platform continuously monitors popular application and extension ecosystems used by developers globally, including code marketplaces and browser extension stores. By identifying potential threats at their source, Koi’s solution allows security teams to preemptively block risks, shifting from a reactive to a proactive security stance.

The potential acquisition aligns with Palo Alto Networks’ broader strategy of expanding its capabilities through significant acquisitions. In late 2025, the company announced plans to acquire Chronosphere for $3.35 billion, enhancing its position in AI-driven application environments. Earlier that same year, Palo Alto Networks also revealed a proposed $25 billion acquisition of CyberArk, which would greatly expand its identity security offerings.

As negotiations for Koi Security progress, the outcome may further solidify Palo Alto Networks’ strategy to tap into the rich pool of cybersecurity talent in Israel, reinforcing its position as a leader in protecting enterprises from evolving digital threats.