Prompt Security is a browser extension platform protecting against sensitive data usage and attacks in generative AI applications, headquartered in New York, United States, founded in 2023.
| Date | Round | Amount | Investors |
|---|---|---|---|
| 2024-11-18 | Series A | $18M | Jump Capital, F5, Hetz Ventures, Okta Ventures, Ridge Ventures |
| 2024-01-22 | Seed | $5M | Hetz Ventures, Four Rivers Group |
Prompt Security was acquired by SentinelOne for $250M (2025-08-04).
Data from The Signal by Return on Security — cybersecurity funding, M&A activity, and company intelligence.