Straiker, an agentic AI security startup, raised $64M in Series A led by Marathon and Citi Ventures. Total funding reaches $85M. New policy engine launched.
Straiker, a Mountain View startup building security tools for autonomous AI agents, closed a $64 million Series A on Tuesday. The company, founded in 2023, has now raised $85 million in total.
Marathon Management Partners, Citi Ventures, Illuminate Financial, and Workday Ventures led the round. Existing backers Bain Capital Ventures and Lightspeed also participated. Gokul Rajaram, founding partner at Marathon, will join Straiker’s board.
The company plans to use the capital for product development and go-to-market efforts. Straiker’s platform monitors agent behavior, enforces guardrails, and flags anomalous actions – a category that has grown as more enterprises deploy agentic workflows in production. Traditional security tools assume human-operated endpoints. Agentic systems introduce new attack surfaces, including prompt injection and tool misuse.
The round size – $64 million for a Series A – reflects investor interest in infrastructure that addresses operational risks tied to generative AI. Marathon’s involvement signals conviction that agentic security will become a standard procurement category, much as cloud security did a decade ago, several venture investors said.
Bain Capital Ventures and Lightspeed had previously led Straiker’s $21 million seed round. The company declined to disclose valuation.
Straiker’s product targets both security teams and AI development teams. It offers API-level integration that does not require modifying the underlying agent framework. Early customers include financial services and healthcare companies, the company said.
The funding announcement coincided with the launch of a policy engine that lets organizations define rules for agent actions. The tool addresses compliance requirements in regulated industries.
Rajaram’s board appointment adds a founder-operator perspective. He previously served on the boards of DoorDash and Coinbase.
The agentic security market remains early stage. Enterprise adoption of AI agents accelerated over the past 12 months, several analysts said. Straiker and competitors are betting that security tools will become a prerequisite before companies deploy agents at scale.
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