● Covered by 1 source · 3 reportsMedium impact3 neutral
Three AI Security Startups Raise Over $228 Million in Funding Rounds
Key points
- Onyx Security raised $113 million in Series B funding, totaling $153 million.
- Obsidian Security secured $85 million in Series D, reaching a $1.1 billion valuation.
- Mindgard received $30 million in Series A funding, bringing its total to $42 million.
- Funds will expand AI agent control, agentic AI security, and AI red-teaming platforms.
- Investments address risks of AI agents and models in corporate systems.
Significant Investments in AI Security
Three AI security startups, Onyx Security, Obsidian Security, and Mindgard, have collectively announced over $228 million in new funding. These investments are directed towards developing and scaling solutions for securing AI agents, models, and applications within enterprise settings, reflecting a growing need for oversight and protection in AI adoption.
Onyx Security's Funding for AI Agent Control
Onyx Security announced a $113 million Series B funding round, led by Bessemer Venture Partners, with participation from Cyberstarts, TCV, Conviction, FirstMark, Vintage, QuantumLight, and G Squared. This brings the Israeli company's total raised to $153 million since its founding two years ago. The new capital will be used to train its proprietary models and scale go-to-market efforts.
Onyx Security offers a centralized platform designed to identify and regulate the use of advanced AI tools across corporate networks. Its technology uses proprietary models to track AI agent decision-making, intervening to rectify unintended or malicious behavior across SaaS, cloud, and endpoint environments.
Obsidian Security Expands Agentic AI Security
Obsidian Security raised $85 million in a Series D funding round, led by Crescent Cove Advisors, with participation from Greylock Partners and Menlo Ventures. This investment values the company at $1.1 billion and brings its total raised to over $200 million. The funds will accelerate its expansion into agentic AI security.
Obsidian Security's platform governs AI agents and SaaS applications, monitoring access and execution within third-party enterprise systems like data warehouses, developer tools, CRMs, and collaboration apps. It includes a runtime governance layer to identify and stop privilege escalation, over-broad data access, and policy violations based on OWASP-aligned risk criteria.
Mindgard's Focus on AI Red-Teaming and Protection
Mindgard secured $30 million in a Series A funding round, led by Album VC, with additional support from Karma Ventures and previous investors .406 Ventures, Atlantic Bridge, IQ Capital, and Lakestar. This brings the total raised by the company to approximately $42 million. The funding will be used to scale its product, engineering, sales, and marketing teams.
Founded in 2022 and spun out of Lancaster University, Mindgard provides an automated AI security and red-teaming platform. The platform identifies and exploits psycho-technical attack surfaces within AI agents, models, and applications, delivering runtime protection. Mindgard has identified over 150 vulnerabilities in popular AI products, including a zero-day code execution flaw in Cursor IDE and security defects in Google Antigravity and ChatGPT.
Addressing AI Risks in the Enterprise
These investments underscore the industry's recognition of the security challenges posed by AI adoption. As enterprises increasingly integrate AI agents and models, solutions that provide oversight, governance, and protection against vulnerabilities and malicious behavior are becoming critical for safe deployment and operation.
✨ This summary was generated by AI from the outlets' reporting listed below. It is not independently verified and may contain errors — check the original sources. How BrevFeed works →
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How outlets covered it
Mindgard, an AI security startup, secured $30 million in Series A funding, bringing its total raised to $42 million. This investment will be used to scale its product, engineering, sales, and marketing teams, accelerating deployments across various sectors.
Obsidian Security secured $85 million in Series D funding, bringing its total raised to over $200 million and valuing the company at $1.1 billion. The funding will be used to expand its agentic AI security offerings, which govern AI agents and SaaS applications to prevent privilege escalation and policy violations.
Onyx Security secured $113 million in Series B funding, bringing its total raised to $153 million, to develop its AI agent control platform for enterprises. This funding will be used to train proprietary models and scale go-to-market efforts, addressing the need for oversight and security of AI tools in corporate environments.