Top 10 AI Cybersecurity Startups with the largest funding rounds in 2026
Tech News World - Here are the Top 10 AI Cybersecurity Startups with the largest funding rounds in 2026, according to Dealroom:
AI platforms have become the major cybersecurity threat since two OpenAI test models broke autonomously into Hugging Face's production systems in July 2026. On August 27, 2026, over 100 major AI platforms including OpenAI, Anthropic, Microsoft, Alphabet, and Amazon signed a letter warning that AI-enabled cyberattacks "will become far more widespread" in the future. To counter AI cybersecurity attacks, VC funds poured into AI Cybersecurity startups: VC funding into startups tagged AI Security on Dealroom hit USD 2.15 billion between January and August 2026 across 119 rounds, according to Dealroom.
Here are the Top 10 AI Cybersecurity Startups with the largest funding rounds in 2026:
1 - Exein - Italy
Exein ranks No. 1 AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 270 million in a funding round led by Headline.
Exein is an AI Cybersecurity Startup that Stops Cyber Attacks and has reached a valuation of USD 1.7 billion in September 2026.
2 - Horizon3.ai - US
Horizon3.ai ranks 2nd AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 250 million in a Series E funding round led by NightDragon and NEA.
Horizon3.ai is an AI Cybersecurity Startup that Tests Cyber Defences and has reached a valuation of USD 2 billion in September 2026.
3 - Armadin - US
Armadin ranks 3rd AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 190 million in a Series A funding round led by Accel.
Armadin is an AI Cybersecurity Startup that Tests Cyber Defences and has reached a valuation of USD 760 million in September 2026.
4 - Glow - US
Glow ranks 4th AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 180 million in a Series A funding round led by Sequoia, Cyberstarts, Greenoaks and Redpoint.
Glow is an AI Cybersecurity Startup that Stops Cyber Attacks and has reached a valuation of USD 1.2 billion in September 2026.
5 - XBOW - US
XBOW ranks 5th AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 120 million + 35 million in a Series C funding round led by Northzone and DFJ Growth.
XBOW is an AI Cybersecurity Startup that Tests Cyber Defences and has reached a valuation of USD 1 billion in September 2026.
6 - Torq - US
Torq ranks 6th AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 140 million in a Series D funding round led by Merlin Ventures.
Torq is an AI Cybersecurity Startup that Stops Cyber Attacks and has reached a valuation of USD 1.2 billion in September 2026.
7 - Zenity - Israel
Zenity ranks 7th AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 125 million in a Series C funding round led by Norwest.
Zenity is an AI Cybersecurity Startup that provides Secure AI and has reached a valuation of USD 500 million in September 2026.
8 - Onyx Security - US
Onyx Security ranks 8th AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 113 million in a Series B funding round led by Bessemer.
Onyx Security is an AI Cybersecurity Startup that provides Secure AI and has reached a valuation of USD 640 million in September 2026.
9 - HiddenLayer - US
HiddenLayer ranks 9th AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 100 million in a Series B funding round led by Delta-v Capital.
HiddenLayer is an AI Cybersecurity Startup that provides Secure AI and has reached a valuation of USD 400 million in September 2026.
10 - depthfirst - US
depthfirst ranks 10th AI Cybersecurity startup that raised the largest funding round in 2026, raising USD 80 million in a Series B funding round led by Meritech.
depthfirst is an AI Cybersecurity Startup that Tests Cyber Defences and has reached a valuation of USD 580 million.
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