September 2026 has been a major month for AI agent funding, with large investments flowing into coding agents, agent infrastructure, security, governance and specialized AI-agent platforms.
The month has been dominated by two particularly large transactions. Cognition, the company behind Devin, announced more than $2 billion in Series E funding at a reported $48 billion valuation. Temporal Technologies followed with a $550 million Series E at a reported $12.55 billion valuation.
Beyond these large rounds, September has also seen significant investment in the infrastructure and security layers supporting the growth of AI agents. Companies such as AIR Security, AIUC, Cymphony and Eve Security are focused on helping organizations secure, evaluate and govern increasingly autonomous AI systems.
AI Agent Funding Rounds in September 2026
| # | Company | Amount | Round | Date | Lead Investors | Category | Location | Details |
|---|---|---|---|---|---|---|---|---|
| 1 | Cognition | $2B+ | Series E | Sep 8 | Andreessen Horowitz, Accel | Coding Agents | San Francisco, US | + |
|
Valuation
Reported at approximately $48B
Company
Developer of AI coding agents, including Devin.
Funding
More than $2B raised in the September financing.
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| 2 | Temporal | $550M | Series E | Sep 14 | Lightspeed, Wellington Management | Agent Infrastructure | Seattle, US | + |
|
Valuation
Reported at approximately $12.55B
Company
Infrastructure for reliable execution of AI and distributed workflows.
Other Investors
Goldman Sachs Alternatives and Tiger Global among participating investors.
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| 3 | Harvey | $550M | Funding | Sep 9 | Diffusion, Lightspeed | Legal Agents | San Francisco, US | + |
|
Valuation
Reported at approximately $15.5B
Company
AI platform building agentic workflows for legal professionals.
Focus
Legal research, analysis, drafting and workflow automation.
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| 4 | Snorkel AI | $350M | Series E | Sep 22 | Insight Partners, S32 | Agent Infrastructure | San Francisco, US | + |
|
Valuation
$3.5B
Company
AI data and reinforcement-learning infrastructure for frontier and agentic systems.
Other Investors
Addition, March Capital, Greylock, Lightspeed, GV and others.
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| 5 | Island | $400M | Series F | Sep 24 | Evolution Equity Partners | Agent Security | Dallas, US | + |
|
Valuation
$6.4B
Company
Enterprise browser and security platform expanding into agentic work.
Other Investors
Sequoia Capital, Prysm Capital, Coatue, Insight Partners and others.
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| 6 | Firecrawl | $75M | Series B | Sep 22 | Smash Capital | Agent Infrastructure | US | + |
|
Company
Web data and crawling infrastructure designed for AI applications and agents.
Other Investors
Altos Ventures, Nexus Venture Partners, Y Combinator, Freestyle and Offline.
Focus
Giving AI agents structured access to current information from the web.
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| 7 | Ema | $77M | Series B | Sep 23 | Creaegis | Enterprise Agents | US | + |
|
Total Funding
$140M
Company
Uses teams of AI agents to automate corporate processes across HR, IT and finance.
Other Investors
Accel, Section 32 and Prosus.
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| 8 | Cyera | $400M | Series G | Sep 23 | Goldman Sachs | Agent Security | US / Israel | + |
|
Valuation
Reported at approximately $12B
Company
Data security platform addressing AI and agent-driven data access.
Focus
Data discovery, protection and security for enterprise AI environments.
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| 9 | AIUC | $40M | Series A | Sep 15 | Ribbit Capital | Agent Governance | US | + |
|
Company
AI governance and insurance infrastructure focused on managing risks from AI agents.
Round
Series A
Category
AI governance, agent risk and security.
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| 10 | AIR Security | $50M | Funding | Sep 1 | Sequoia Capital | Agent Security | US | + |
|
Company
Security platform for assessing and controlling the skills, tools and add-ons used by AI agents.
Lead
Sequoia Capital
Category
Agent security and governance.
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| 11 | Baselayer | $35M | Series A | Sep 22 | M13 | Agent Infrastructure | US | + |
|
Company
Financial fraud and identity infrastructure for increasingly automated transactions.
Other Investors
Picus Capital, Afore Capital and Torch Capital.
Category
Financial infrastructure and agent identity.
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| 12 | Cymphony | $30M | Series A + Seed | Sep 9 | Sequoia Capital, SMBC | Agent Security | Israel | + |
|
Company
Security infrastructure for AI agents and autonomous systems.
Lead Investors
Sequoia Capital and SMBC.
Category
Agent security and enterprise security.
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| 13 | Jack & Jill | $40M | Series A | Sep 15 | Air Street Capital | Agent Workforce | US | + |
|
Company
AI workforce and recruiting infrastructure focused on agent-driven work.
Lead
Air Street Capital
Category
AI workforce and enterprise agents.
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| 14 | MIND Security | $72M | Series B | Sep 18 | Crosspoint Capital Partners | Agent Security | Tel Aviv, Israel | + |
|
Company
Security platform addressing data leakage and risks created by AI agents.
Lead
Crosspoint Capital Partners
Other Investors
YL Ventures and Paladin Capital Group.
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| 15 | Outerlimit | $16M | Pre-seed | Sep 22 | AlbionVC, Evolution Equity Partners | Agent Security | London / New York | + |
|
Company
Security and authorization layer designed specifically for agentic AI.
Other Investor
Crane Venture Partners
Focus
Agent identity, authorization and control at the point of tool execution.
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| 16 | Kontext | $4M | Seed | Sep 24 | 42CAP | Agent Security | Munich, Germany | + |
|
Company
AI agent runtime security platform.
Other Investors
a16z CSX and High-Tech Gründerfonds.
Focus
Security controls for AI coding agents and agent tool execution.
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| 17 | Go.AI | $85M | Series A | Sep 22 | Updata Partners | Agent Infrastructure | US | + |
|
Company
Private AI infrastructure for regulated organizations.
Lead
Updata Partners
Category
Private AI infrastructure and enterprise deployment.
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| 18 | Dextr AI | $6.7M | Seed | Sep 24 | Elevation Capital | Hospitality Agents | San Francisco, US | + |
|
Company
AI agents for hotel reservations, guest requests and hospitality operations.
Lead
Elevation Capital
Category
Vertical AI agents and hospitality automation.
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| 19 | AI Score | $5.4M | Seed | Sep 4 | Fuel Ventures | AI Governance | UK | + |
|
Company
AI governance and risk management platform.
Lead
Fuel Ventures
Category
AI governance and agent risk.
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| 20 | Keewano | $12M | Seed | Sep 15 | Hetz Ventures | Agent Infrastructure | Israel | + |
|
Company
Infrastructure for deploying and operating AI agents.
Lead
Hetz Ventures
Category
Agent infrastructure and deployment.
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| 21 | DataAgent | $10M | Pre-seed | Sep 1 | MizMaa Ventures | Agent Infrastructure | Israel | + |
|
Company
Cloud infrastructure for AI agents and autonomous workloads.
Other Investor
Alicorn
Category
Cloud and agent infrastructure.
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| 22 | Primo | $8M | Series A | Sep 23 | Headline, Global Founders Capital | IT Agents | UK / Germany / Netherlands | + |
|
Company
AI-powered IT operations automation platform.
Investors
Headline and Global Founders Capital.
Category
IT operations and enterprise automation agents.
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| 23 | Maximum | $30M | Seed | Sep 3 | CRV | Agent Infrastructure | Miami, US | + |
|
Company
AI software and agents for banking and financial services.
Other Investors
Pear VC, Restive, Plug and Play Ventures and Anthemis.
Category
Financial services agents and infrastructure.
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| 24 | Empirik | $21M | Seed | Sep 1 | Sequoia Capital | Agent Infrastructure | US | + |
|
Company
Infrastructure supporting the development and operation of AI agents.
Lead
Sequoia Capital
Category
Agent infrastructure.
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| 25 | Runable | $21M | Series A | Sep 26 | Susquehanna Venture Capital | Business Agents | Bengaluru, India | + |
|
Company
AI agent platform focused on helping small businesses launch and grow.
Other Investors
Nexus Venture Partners, Together Fund and Array VC.
Note
Announcement date should be rechecked before publication because the reported date falls after the current September 25 update.
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| 26 | ByteAsk | $1M | Pre-seed | Sep 24 | Y Combinator | Coding Agents | San Francisco, US | + |
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Company
Coding agents focused on C and C++ development.
Other Backers
Entrepreneur First and angels from quantitative trading firms.
Category
Coding agents and developer infrastructure.
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| 27 | AGent | $11M | Seed | Sep 12 | Clean Industry Ventures, Intrepid Financial Partners | Agent Infrastructure | US | + |
|
Company
Software and infrastructure for agent-based workflows.
Other Investors
MassMutual Ventures and Spero Ventures.
Category
Agent infrastructure and workflow automation.
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| 28 | Health Force | $4.9M | Seed | Sep 17 | LUMO Labs | Healthcare Agents | Italy | + |
|
Company
AI agents designed for healthcare workflows.
Lead
LUMO Labs
Category
Healthcare agents.
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| 29 | Eve Security | $4.5M | Seed Extension | Sep 15 | Run Ventures | Agent Security | US | + |
|
Company
Security technology addressing risks associated with AI agents.
Lead
Run Ventures
Category
Agent security.
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| 30 | Lightsage | $4M | Seed | Sep 8 | Nexus Venture Partners | Agent Infrastructure | US | + |
|
Company
Infrastructure supporting the deployment and operation of AI agents.
Lead
Nexus Venture Partners
Category
Agent deployment and infrastructure.
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Biggest AI Agent Funding Rounds
Cognition recorded the largest disclosed AI agent funding round of the month, raising more than $2 billion in Series E funding. The company develops autonomous software engineering agents, including Devin.
Temporal Technologies raised $550 million in Series E funding. Its infrastructure is designed to support reliable, long-running workflows, including applications involving AI agents.
AIR Security announced $50 million across two funding rounds, with its technology focused on discovering and evaluating AI agents and the components they use.
AIUC raised $40 million in Series A funding to develop AI governance, auditing and certification capabilities.
Jack & Jill also raised $40 million in Series A funding, focusing on AI-agent workflows for recruiting and workforce processes.