Prompt Security was acquired by SentinelOne in September 2025 for about $180M in filings, not the $250M in press reports. See funding, founders and exit math.
Prompt Security is a Tel Aviv generative-AI security startup that SentinelOne acquired on September 5, 2025 for about $180 million in cash and stock, according to SentinelOne's SEC filings. Press reports at announcement had estimated $250 million to $300 million. Founded in August 2023 by Itamar Golan and Lior Drihem, it raised $23 million across two rounds.
What did SentinelOne pay for Prompt Security?
SentinelOne's filings put the Prompt Security price at about $180 million, well below the $250 million that circulated in the press. SentinelOne itself did not disclose terms at the August 5, 2025 announcement, Dark Reading reported.
| Source | Figure |
|---|---|
| Globes, sources, August 4, 2025 | Estimated $250 million to $300 million |
| CTech and Dark Reading, August 2025 | Estimated about $250 million |
| SentinelOne Form 8-K, September 8, 2025 | About $180 million in cash and Class A stock at closing, including 1,555,099 shares |
| SentinelOne Form 10-Q, quarter ended October 31, 2025 | Fair value of consideration $159.3 million: $133.6 million cash, $17.2 million stock, $0.9 million assumed options and a $7.6 million indemnification holdback |
The 8-K and 10-Q measure the price differently, and Olam has not reconciled them. Both are below the early estimates. SiliconANGLE reported the deal was expected to close by November, and SentinelOne's 8-K shows it closed on September 5.
How good was the return on Prompt Security's $23 million?
The return was roughly 7 times invested capital, not the 11 times cited from the press estimate. Olam's arithmetic: $159.3 million divided by $23 million is about 6.9, and $180 million divided by $23 million is about 7.8.
Globes reported that PitchBook valued Prompt Security at $60 million in its November 2024 round. Against that valuation, the $180 million figure is about 3 times, not the five times implied by the $300 million estimate.
Who founded Prompt Security and what did it raise?
Itamar Golan (CEO) and Lior Drihem (CTO) founded Prompt Security in August 2023, according to Wikipedia. Before founding it they collaborated at Orca Security on an early generative-AI feature in a security tool, and Globes describes both as Check Point and Orca veterans. Both are Unit 8200 alumni, according to CTech.
Prompt Security emerged from stealth on January 24, 2024 with a $5 million seed round led by Hetz Ventures, and announced an $18 million Series A on November 20, 2024 led by Jump Capital with Hetz, Ridge Ventures, Okta Ventures and F5, according to Wikipedia. It won Check Point's CPX 2024 Innovation Sandbox and had about 50 employees in 2025.
Globes called the sale an impressive exit that came without large Israeli venture funds, using small funds that invested modest amounts.
What did Prompt Security's platform do?
Prompt Security monitored employee use of AI tools in browsers, desktop applications and APIs, and blocked prompts that could leak data or enable attacks such as prompt injection, according to Dark Reading. It was sold as software-as-a-service and on-premises.
Golan said in a blog post that the company had dozens of enterprise customers, including in financial services and retail, and a multi-million-dollar annual recurring revenue business, Dark Reading reported. VentureBeat described its MCP gateway as sitting between AI applications and more than 13,000 known Model Context Protocol servers.
SentinelOne said it would fold the technology into its Singularity platform. For the acquirer, see Olam's SentinelOne profile.
How does the Prompt Security deal compare with Aim Security?
Cato Networks acquired Aim Security on September 3, 2025 for an undisclosed sum reported at about $350 million, SiliconANGLE and CTech reported. Aim had raised about $28 million over two rounds, so Olam's arithmetic puts the reported multiple near 12 times, against about 7 times for Prompt Security on SentinelOne's filings.
Calcalist reported that Akamai and Check Point competed for Aim, and that Lasso Security and Pillar remained on the market at that point. Cato is led by Shlomo Kramer, who co-founded Check Point with Marius Nacht, as covered in Olam's Marius Nacht profile.
What does the corrected price change?
The corrected price makes Prompt Security a solid but smaller outcome than the early coverage suggested: about $160 million to $180 million for a company that raised $23 million in under two years. Anyone citing the $250 million figure should check it against SentinelOne's 8-K and 10-Q, which are the primary sources.
Prompt Security FAQ
How much did SentinelOne pay for Prompt Security?
About $180 million in cash and stock at closing on September 5, 2025, according to SentinelOne's Form 8-K. The 10-Q records a fair value of $159.3 million.
Who founded Prompt Security?
Itamar Golan (CEO) and Lior Drihem (CTO) founded it in August 2023, according to Wikipedia.
How much did Prompt Security raise?
It raised $23 million: a $5 million seed in January 2024 led by Hetz Ventures and an $18 million Series A in November 2024 led by Jump Capital, according to Wikipedia.
When did SentinelOne announce the Prompt Security deal?
SentinelOne announced the agreement on August 5, 2025 and completed it on September 5, 2025, according to its SEC filings.
What is the MCP gateway?
Prompt Security's MCP gateway sits between AI applications and more than 13,000 known Model Context Protocol servers, according to VentureBeat.
How we report: Olam stories draw on public filings, company disclosures and named sources, checked by our editors. Read our methodology · Corrections
