CalypsoAI is a platform for protecting against adversarial machine learning (ML) attacks, headquartered in San Francisco, United States, founded in 2018.
| Date | Round | Amount | Investors |
|---|---|---|---|
| 2025-04-07 | Growth Stage | $5M | Crosspoint Capital Partners |
| 2023-12-18 | Growth Stage | Undisclosed | Hakluyt Capital |
| 2023-06-26 | Series A | $23M | Paladin Capital Group, Lockheed Martin Ventures, Hakluyt Capital, Expeditions Fund |
| 2020-07-22 | Growth Stage | $5.5M | The New Frontiers (TNF) |
| 2020-07-22 | Series A | $13M | Paladin Capital Group, Cyber Mentor Fund |
| 2019-04-19 | Seed | $2.2M | 8VC, Frontline Ventures, Lightspeed Venture Partners, Day One Ventures, Cyber Mentor Fund, Actions Capital (fka K50 Ventures) |
CalypsoAI was acquired by F5 for $180M (2025-09-11).
Data from The Signal by Return on Security — cybersecurity funding, M&A activity, and company intelligence.