Nir Zuk built Palo Alto Networks into one of the most dominant forces in enterprise cybersecurity. Now he is doing it again. Cylake, the stealth-mode startup Zuk founded after leaving Palo Alto, has raised $245 million in a funding round that signals serious investor conviction in whatever he is building next, according to a Globes report on the deal. The round’s scale alone puts Cylake among the largest early-stage cybersecurity raises in recent memory — and it arrives at a moment when enterprise security budgets are expanding fast and attackers are growing more sophisticated by the quarter.
The raise is a reminder that founder pedigree still moves enormous capital in the venture world, especially in cyber, where technical credibility and industry relationships matter as much as a polished deck. Zuk’s track record at Palo Alto Networks — which he co-founded in 2005 and helped scale into a multi-billion-dollar public company — gives Cylake a head start that few startups ever enjoy. Investors are, in effect, betting on the operator before the product. For context on how the enterprise data protection space is evolving, even well-funded competitors like MIND raised $72 million recently to tackle sensitive-data visibility — a fraction of what Cylake has now secured.
What Cylake Is Building — and Why It’s Still Under Wraps
Cylake has operated in stealth, which means the company has shared almost nothing publicly about its specific product direction. That opacity is intentional. In competitive cybersecurity markets, announcing your architecture before you launch gives rivals time to respond and customers time to wait. What is known is that Zuk has gathered a team and is working on what sources describe as a next-generation approach to enterprise security — likely informed by the gaps he observed firsthand while leading product strategy at Palo Alto Networks for years.
The $245 million figure suggests the company is preparing for a significant go-to-market push, not just continued R&D. Rounds of this size typically fund a combination of engineering talent acquisition, sales infrastructure buildout, and the kind of channel partnerships that enterprise security sales require. If Cylake follows the playbook Zuk used at Palo Alto — lead with a platform approach that consolidates point solutions — it could position itself squarely against incumbent giants like CrowdStrike, Microsoft Security, and Zuk’s former employer.
The Funding Climate That Made This Possible
Cylake’s haul did not happen in a vacuum. Cybersecurity venture funding has remained resilient even as broader tech investment cooled through 2023 and into 2024. Ransomware incidents, state-sponsored intrusions, and the expanding attack surface created by AI-generated threats have kept CISOs spending aggressively — and kept investors hungry for the next platform play. The bar for raising a nine-figure round in cyber is high, but it is not impossible when a founder can point to a prior exit of this magnitude.
The deal also reflects a broader pattern of experienced operators spinning out of large security vendors to start fresh. Zuk is not alone in that trend, but the size of his raise puts Cylake in a different category from most founder-led re-entries into the market. With $245 million in the bank and one of the most recognized names in enterprise cybersecurity on the founding team, the startup enters the competitive landscape with leverage that will be difficult for even well-capitalized rivals to ignore. The pressure now shifts entirely to execution — and to showing, eventually, what Cylake has actually been building behind closed doors. Observers watching MCP config vulnerabilities and other emerging attack vectors will be curious whether Cylake’s product addresses the next generation of enterprise threats head-on.
