Armorblox
Reviewed acquired Updated Mar 24, 2026This profile is AI-generated. If you spot an error, please help us fix it by sharing a URL to the correct information.
Investors
Founders
About
Armorblox was a cybersecurity company that used natural language understanding (NLU) and large language models to protect enterprise communications from threats such as business email compromise, phishing, and data loss 1. Founded in 2017 in Sunnyvale, California, the company emerged from stealth in February 2019 1. Armorblox’s platform integrated via API with email and communication tools including Office 365, Google Workspace, Slack, and OneDrive to analyze textual content and detect socially engineered attacks 1. The company served over 9,000 organizations 3. Cisco announced its intent to acquire Armorblox on May 31, 2023, and completed the acquisition on July 14, 2023 25. The Armorblox team joined Cisco’s Security Business Group to integrate generative AI capabilities across Cisco’s security portfolio 2.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2019-02-20 | Series A | $16.5M | General Catalyst | Point72 Ventures, A Capital, SV Angel (Ron Conway), Robin Vasan, John Thompson, Gerhard Eschelbeck, Oliver Friedrichs, DJ Patil 14 |
| 2021-02-23 | Series B | $30M | Next47 | Polaris Partners, Unusual Ventures, General Catalyst 3 |
| 2022-09-21 | Strategic | Undisclosed (S Ventures fund range: $1M–$5M) | S Ventures (SentinelOne) | — 678 |
Total raised: $46.5M 3.
What Investors Say
TJ Rylander of Next47, on the Series B: “Cybercriminals raked in $1.7 billion through phishing and business email compromise attacks” 3.
Ido Kotler, Innovation Lead at SentinelOne: “Armorblox has strong capabilities in machine learning (ML) and NLU which result in high detection rates and low false positives” 6.
What Founders Say
CEO DJ Sampath on Armorblox’s ambition: “The next Palo Alto Networks is going to look like this. It will not be a firewall company” 3.
Sources
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Crunchbase News, “Cybersecurity Startup Armorblox Raises $16.5M, Launches Out Of Stealth,” February 2019. https://news.crunchbase.com/startups/cybersecurity-startup-armorblox-raises-16-5m-launches-out-of-stealth/↩↩↩↩
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SiliconANGLE, “Cisco buys Armorblox to beef up cybersecurity with generative AI,” May 2023. https://siliconangle.com/2023/05/31/cisco-buys-armorblox-beef-cybersecurity-generative-ai/↩↩
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Crunchbase News, “Armorblox Raises $30M To Secure Email And Beyond,” February 2021. https://news.crunchbase.com/cybersecurity/armorblox-raises-30m-to-secure-email-and-beyond/↩↩↩↩↩
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Business Wire, “Armorblox Brings Textual Understanding to Security, Protecting Against Hackers and Human Error,” February 2019. https://www.businesswire.com/news/home/20190220005375/en/Armorblox-Brings-Textual-Understanding-Security-Protecting-Hackers↩
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Cisco Blogs, “Furthering the AI-First Security Cloud: Cisco Announces Intent to Acquire Armorblox,” accessed March 2026. https://blogs.cisco.com/news/cisco-announces-intent-to-acquire-armorblox↩
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SentinelOne Blog, “S Ventures Invests in Armorblox to Combat Email Threats Using Natural Language Understanding and AI,” September 2022. https://www.sentinelone.com/blog/s-ventures-invests-in-armorblox-to-combat-email-threats-using-natural-language-understanding-and-ai/↩↩
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SentinelOne press release, “SentinelOne Launches S Ventures Fund,” September 21, 2022. Accessed May 2026. https://www.sentinelone.com/press/sentinelone-launches-s-ventures-fund/ — Names Armorblox among the initial S Ventures portfolio investments at fund launch on September 21, 2022. Individual check amounts not disclosed. ↩
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TechCrunch, “SentinelOne launches $100M fund to invest in enterprise cybersecurity startups,” September 21, 2022. Accessed May 2026. https://techcrunch.com/2022/09/21/sentinelone-s-ventures-fund/ — Independent contemporaneous coverage confirming Armorblox is among the named S Ventures fund initial portfolio companies as of fund launch on September 21, 2022; fund makes individual investments between approximately $1M and $5M; specific Armorblox check size not publicly disclosed. ↩