Onyx Security at a glance
As of- [1] Latest valuation: SecurityWeek, July 30, 2026
- [2] Equity raised: Sum of the 2 sourced equity rounds in the funding history below (debt, tender offers and rumored rounds excluded), July 30, 2026
- [3] Lead investors: SecurityWeek, July 30, 2026
- [4] Founded: SecurityWeek (retrieved July 30, 2026)
- [5] Headquarters: SecurityWeek (retrieved March 12, 2026)
What Onyx Security does
Onyx Security builds a control platform that lets enterprises deploy AI agents by managing their permissions, monitoring their activity and preventing risks from autonomous AI systems.[1] The company says its proprietary models monitor each step of an agent's reasoning and correct unintended or malicious agent actions.[2] The company is based in New York and Tel Aviv and employs more than 80 people across Israel, the United States and Canada.[1],[2] Onyx said the funding will go toward developing its next AI models and expanding sales, business development and marketing in the United States and other markets.[1]
Business model and customers
In June 2026, Anthropic announced it had integrated Onyx's technology to help enterprise customers adopt AI securely.[1],[2] Onyx says it has grown revenue fourfold since coming out of stealth four months before its Series B.[2] The company says dozens of enterprises use it, including Fortune 500 companies in banking, technology, insurance and energy, and Revolut's head of security engineering is quoted as a customer.[2]
Onyx Security profile
written 2026-10-24Onyx Security builds a control and security platform for enterprise AI agents and raised a $113 million Series B in July 2026.
What Onyx Security does
Onyx Security develops a platform that lets enterprises deploy AI agents securely and at scale by managing their permissions, monitoring their activity and preventing risks associated with autonomous AI systems. The company calls itself the AI control company.[1],[2]
It says its proprietary models monitor each step of an agent's reasoning and can correct unintended or malicious agent actions. In other words, the product sits between an enterprise's AI agents and the systems they can act on, and enforces policy as the agent works.[2]
The release frames the problem as one of accountability: employees are giving increasingly capable agents access to critical systems and tasking them with complex jobs, and the agents are empowered but not accountable for their actions. Onyx describes its product as a secure AI control plane that lets security, governance and infrastructure teams discover and control how advanced AI is used in their environment, covering both third-party agents and agents built by a customer's own engineers. Revolut's Solar says the platform helps the bank evaluate and stop threats at runtime across coding agents from multiple providers.[2]
Customers and partners
Calcalist quotes CEO Maxim Bar Kogan saying that coming out of stealth was the point at which Onyx could begin selling broadly, that demand exceeded expectations, and that this let it raise the Series B much sooner than expected. He also said the goal is not to build a company to sell but an independent, global one. Those are management statements, not verified results.[1]
The company says it has grown revenue fourfold since coming out of stealth four months before the Series B. It has not disclosed revenue or ARR figures. The release adds that dozens of other AI providers have been integrated with the Onyx platform.[2]
History
Funding
Calcalist reported that the round values Onyx at an estimated $640 million. Calcalist calls that a several-fold increase from the previous valuation. That is the outlet's estimate and not a figure the company has stated. Onyx said the new money will go to its next-generation AI models and to expanding sales, business development and marketing in the United States.[1]
References
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Company Snapshot
Onyx Security is an enterprise SaaS company, based in Tel Aviv, Israel, founded 2024 by Bar Kogan, Gil Elbaz.
Recent changes
- Aug 3, 2026Aug 3, 2026Onyx Security Hits $640M Valuing AI Agent Governance Pulse story
- Jul 30, 2026Jul 30, 2026Raised $113M Series B at a ~$640M valuation SecurityWeek
- Jul 30, 2026Jul 30, 2026First reported total funding: $153M SecurityWeek
- Jul 30, 2026Jul 30, 2026First reported valuation: $640M SecurityWeek
- Jul 30, 2026Jul 30, 2026New investor: FirstMark Capital SecurityWeek
Earlier changes (9)
- Jul 30, 2026Jul 30, 2026New investor: TCV SecurityWeek
- Jul 30, 2026Jul 30, 2026New investor: Vintage SecurityWeek
- Jul 30, 2026Jul 30, 2026New investor: QuantumLight SecurityWeek
- Jul 30, 2026Jul 30, 2026New investor: G Squared SecurityWeek
- Jul 30, 2026Jul 30, 2026New investor: Bessemer Venture Partners SecurityWeek
- Jul 29, 2026Jul 29, 2026Onyx Security Raises $113M Series B With Bessemer Pulse story
- Mar 12, 2026Mar 12, 2026Raised $40M Seed SecurityWeek
- Mar 12, 2026Mar 12, 2026New investor: Cyberstarts SecurityWeek
- Mar 12, 2026Mar 12, 2026New investor: Conviction SecurityWeek
Funding history
2 equity events · newest first · sources dated per row| Date | Round | Amount | Valuation | Lead investors | Source |
|---|---|---|---|---|---|
| Jul 30, 2026 | Series B | $113M | ~$640Mpost-money | SecurityWeek | |
| Mar 12, 2026 | Seed | $40M | — | — | SecurityWeek |
Equity only. “Equity raised” above sums the rounds with a dated, linked source; rumored rounds, tender offers and secondary sales are listed but not counted, and debt financing is listed separately.
How Onyx Security has been funded
It raised a $5 million seed round from Cyberstarts in 2024, then a $35 million Series A led by Conviction in March 2026, bringing total funding to $40 million when it emerged from stealth.[4],[1] On July 29, 2026, Onyx announced a $113 million Series B led by Bessemer Venture Partners, with Cyberstarts, TCV, Conviction, FirstMark, Vintage, QuantumLight and G Squared participating, bringing total funding to $153 million.[2] Calcalist reported the round valued Onyx at an estimated $640 million.[1]
Investors
Latest Pulse
- Aug 13, 2026Mindgard Raises $30M to Red-Team Enterprise AI SystemsMindgard raised a $30 million Series A led by Album VC to scale an automated red-teaming platform for AI systems, after its research uncovered a zero-day flaw in Cursor and defects in Google Antigravity and ChatGPT.→
- Aug 3, 2026AI Agent Governance Is Becoming Its Own Budget LineGroundcover, Glow and Onyx Security have all reached nine- or ten-figure valuations within months of launch by treating AI-agent oversight as a distinct enterprise budget line rather than a feature bolted onto existing security or observability tools.→
- Aug 3, 2026Horizon3 Hits $2B Valuation as AI Threats Force a Security RethinkHorizon3 raised a $250 million Series E at a $2 billion valuation, betting that AI-accelerated attacks require continuous, autonomous penetration testing rather than the periodic audits most enterprises still rely on.→
- Aug 3, 2026Onyx Security Hits $640M Valuing AI Agent GovernanceOnyx Security raised $113M in a Series B at a $640M valuation just four months after emerging from stealth, governing what autonomous agents are allowed to do once inside enterprise systems.→
- Aug 3, 2026AI Is Now Both the Weapon and the Target in CyberattacksSecurity researchers describe AI as simultaneously the tool attackers use to accelerate campaigns and the infrastructure now being targeted directly, a dual role that's reshaping what enterprise security teams have to defend.→
- Aug 3, 2026Follow-On Rounds Are Coming Faster Than EverSimile went from a $100 million Series A to a $200 million Series B at a $2 billion valuation in five months; Onyx Security raised its Series B four months after stealth -- evidence the time between funding rounds for hot AI startups keeps compressing.→
- Aug 3, 2026AI Agent Security Is Minting New Unicorns FastGlow's $180M endpoint-security raise and Onyx Security's $113M agent-governance round show AI-agent security has become one of 2026's fastest-funded categories, with multiple companies reaching $500M+ valuations within months of launch.→
- Jul 29, 2026Onyx Security Raises $113M Series B With BessemerOnyx Security closed a $113 million Series B led by Bessemer Venture Partners, adding to a wave of nine-figure cybersecurity rounds closing the same week as ThreatLocker's $190 million raise.→
Coverage Timeline
newest firstAll Coverage
AI
AI Agent Governance Is Becoming Its Own Budget Line
Groundcover, Glow and Onyx Security have all reached nine- or ten-figure valuations within months of launch by treating AI-agent oversight as a distinct enterprise budget line rather than a feature bolted onto existing security or observability tools.
Onyx Security Hits $640M Valuing AI Agent Governance
FUNDING
Onyx Security Hits $640M Valuing AI Agent Governance
Onyx Security raised $113M in a Series B at a $640M valuation just four months after emerging from stealth, governing what autonomous agents are allowed to do once inside enterprise systems.
Onyx Security Raises $113M Series B With Bessemer
FUNDING$113M Series B
Onyx Security Raises $113M Series B With Bessemer
Onyx Security closed a $113 million Series B led by Bessemer Venture Partners, adding to a wave of nine-figure cybersecurity rounds closing the same week as ThreatLocker's $190 million raise.
Related Companies
Shared investors
Onyx Security FAQ
What is Onyx Security's valuation?
Calcalist reported the round valued Onyx at an estimated $640 million.[1]
How much has Onyx Security raised?
On July 29, 2026, Onyx announced a $113 million Series B led by Bessemer Venture Partners, with Cyberstarts, TCV, Conviction, FirstMark, Vintage, QuantumLight and G Squared participating, bringing total funding to $153 million.[2]
Who invested in Onyx Security?
Onyx Security raised a $5 million seed round from Cyberstarts in 2024, then a $35 million Series A led by Conviction in March 2026, bringing total funding to $40 million when it emerged from stealth.[4],[1]
Who is the CEO of Onyx Security?
Bar Kogan is CEO and Elbaz is chief AI officer.[3]
Where is Onyx Security headquartered?
Onyx Security is based in New York and Tel Aviv and employs more than 80 people across Israel, the United States and Canada.[1],[2]
What does Onyx Security do?
Onyx Security builds a control platform that lets enterprises deploy AI agents by managing their permissions, monitoring their activity and preventing risks from autonomous AI systems.[1]
When was Onyx Security founded and where is it based?
Onyx Security was founded in 2024 and is headquartered in Tel Aviv, Israel, according to SecurityWeek.
References
researched 2026-10-23Sources & methodologyshow
Where these figures come from
- SecurityWeekValue Add VC data3 facts
- SecurityWeekValue Add VC data1 fact
Figures are labelled Reported (a source states it), Estimated, Derived (computed from other facts) or Rumored (in talks / unconfirmed). Rumors never replace a confirmed figure. Each figure keeps its own as-of date; history is preserved rather than overwritten.