Sequoia Co-Leads $25M Series A for Cymphony’s AI Agent Security
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Cymphony, a cybersecurity startup that helps companies track what their AI agents can reach, has emerged from stealth with $30 million in total funding. The package includes a $25 million Series A co-led by Sequoia Capital and SMBC Fin Atlas Beyond Fund, announced September 9, 2026. The round values the company at more than $100 million post-investment and follows a previously undisclosed seed investment from Sequoia.
The company splits its operations between New York, New York, and Tel Aviv, with roughly 30 employees across the two offices.
The problem Cymphony targets is that AI agents often bypass the access and identity controls that apply to employees, yet they touch many systems and handle large volumes of corporate data. That makes it hard for enterprises to know who, or what, can reach which information. Cymphony gives security teams one view of employees, AI agents, and other non-human identities, along with the systems and sensitive data each can access. The two-year-old company built what it calls a workforce graph that combines identity, data, and activity signals.
The startup says it is already surfacing these exposures inside large organizations. At one US public company it found about 85,000 files that had become reachable by AI tools and agents, helped close the gap, and confirmed none had been accessed through those systems. In another case, an outside collaborator had installed an unsanctioned AI assistant that used the collaborator’s existing permissions to scan thousands of sensitive files.
Beyond detection, Cymphony uses its own AI agents to investigate incidents, rank what security teams should tackle first, and automate parts of remediation such as fixing access permissions. The platform can run largely on its own, and customers can add a managed service that puts Cymphony’s security staff on more complex cases.
Sequoia’s first investment came more than two years ago, before the company had a product or a settled direction. That seed bet was on founders Shy Dekel, Idan Berkovits, and Edi Gotlieb, all graduates of Talpiot, the Israeli military’s selective technology program. By the Series A, Cymphony had shipped a product, signed a double-digit number of enterprise customers, and reached seven figures in annual recurring revenue within its first year of selling. Customers include KKR, Syngenta, Cass Information Systems, and Athennian. Sequoia has also used the product internally since early in its development.
Cymphony is entering a crowded field as security vendors respond to risks from AI agents, competing with established names such as Microsoft, Okta, CyberArk, Wiz, and Varonis. Its stated difference is treating identity security and data security as a single problem. The company says it has already replaced some existing tools at customers, consolidating two products at one enterprise and removing the need for a third, though Sequoia views it as an added layer for now. Most customers are in North America, with early demand appearing in Europe, the Middle East, and Africa.
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