All analysis was generated autonomously, without human review. Scores are analytical opinions drawn from the cited public sources, without hands-on testing. They are not audits, certifications, investment reports, purchasing advice, or evaluations of quality.
Prompt Security shipped configurable screening software a customer tunes, the kind a larger platform could build, yet SentinelOne paid for it in September 2025 after pre-close press estimated the deal near $250 million. What commanded that price was timing and a working product inside a 2025 buying wave. Its MCP risk-scoring data draws on more than 13,000 public GitHub servers a funded rival could rebuild, and the public pages carry no compliance attestation. It screens prompts and responses inline for shadow AI, data leakage, and prompt injection across employee, application, and agent traffic, and won a 10x Banking CISO, HiBob's global CISO, and other regulated buyers. It now ships under the SentinelOne name, its motion folded into the acquirer.
| Description | Prompt Security protects how enterprises use AI across employee tools, homegrown apps, code assistants, and agents, blocking risks such as prompt injection, data leaks, and shadow AI. | [f1] |
|---|---|---|
| Acquisition | SentinelOne, announced 2025-08-05 | [f2] |
| Founded | 2023 | [f3] |
| HQ | Tel Aviv, Israel | [f4] |
| Funding | $23M total | [f3] |
| Latest funding | Series A, $18 million (November 2024) | [f3] |
| Deployment | SaaS, Self-hosted | [f5] |
| Product | What it does |
|---|---|
| Prompt Security | Runtime GenAI security that screens employee AI use, homegrown LLM apps, and agents for prompt injection, data leakage, and shadow AI, with inline blocking and redaction. |
AI Defense Matrix
| Govern | Identify | Protect | Detect | Respond | Recover | |
|---|---|---|---|---|---|---|
| AI-Workload Platforms Inference servers, training platforms, vector DB platforms, and the model-loading supply chain. | ||||||
| AI Orchestration Tools Agentic orchestration tools, plus their plugins, skills, hooks, system prompts, scaffolding, harnesses, configuration settings, and MCP clients on user devices. | ||||||
| AI-Generated Code Code produced by AI tools, AI-assisted reviews, AI-generated infrastructure-as-code and tests, and vibe-coded apps that bypass CI/CD. | ||||||
| AI Gateways & Routers MCP proxies and gateways, LLM routers, outbound AI-service traffic, shadow AI egress, and model-registry traffic. | ||||||
| AI Model Model weights, fine-tuning checkpoints, model cards, registries, AIBOM, and the third-party LLMs your enterprise consumes. | ||||||
| Training Data Datasets used for training, fine-tuning, and continued learning. | ||||||
| Runtime AI Data User prompts, inference inputs, RAG content, vector DB content, persistent agent memory, and interaction history. | ||||||
| AI Agent Identities AI agents as non-human principals, plus credentials, keys, permission scopes, service accounts, and delegation chains across agents and tools. |
Prompt Security screens prompts and responses at runtime, discovers employee AI tool use including shadow AI, and enforces data privacy policy. The product is mapped to the AI Defense Matrix. [f6]
How well the company can compete in its security market, scored across eight dimensions against public evidence.
| Dimension | Score |
|---|---|
| Problem Clarity How precisely the company defines its problem, with evidence the problem exists at the scale claimed. | 3/5 |
| Capability Depth How specific the technical capabilities are, with evidence beyond marketing claims such as docs, demos, and third-party validation. | 3/5 |
| Market Timing Whether the market is ready for this product, with evidence that buyers are actively seeking solutions. | 4/5 |
| Team Credibility Demonstrated domain expertise with public signals such as prior exits, publications, and industry recognition. | 3/5 |
| GTM Proof Evidence of actual traction (customers, revenue signals, partnerships) beyond stated intentions. | 4/5 |
| Funding Efficiency Whether funding matches go-to-market ambition, with signs of capital-efficient growth. | 4/5 |
| Category Clarity Whether the company creates or fits a recognizable category that buyers can quickly place in their stack. | 3/5 |
| Incumbent Defensibility How vulnerable the core value proposition is to absorption as a feature by a platform vendor. | 3/5 |
Unlock the Full Analysis
The reasoning for the scores, the strategy deep dive, the business risks, and more. AI access comes with the purchase, so your AI tools can read the full profile too. You keep 12 months of access.
One-time purchase: $20 per profile.
UnlockReading several? Unlock the entire catalog.
A closer look at the company's product strategy, measuring how defensible it is against market forces and examining the eight areas behind it.
reinforce or reposition
| Dimension | Score |
|---|---|
| Value Delivery Does the product sell software as the product, or judgment, trust, or accountability with software as the delivery mechanism. | 1/3 |
| Switching Cost How expensive leaving is for a customer: data portability, integrations, learned workflows, network effects, regulatory data residency. | 2/3 |
| Compliance Moat Whether certifications, liability acceptance, or audit trails block an easy replacement. | 1/3 |
| Problem Complexity Whether the product requires ML, optimization, real-time systems, or years of specialized expertise. | 3/3 |
| Buyer Profile Whether buyers are SMB operators, mid-market IT teams, or regulated enterprises and governments with procurement gates. | 3/3 |
| Layer Whether the product is an end-user application, a platform with application features, or infrastructure other applications depend on. | 2/3 |
| Proprietary Data, Content, or IP Whether the product accumulates datasets, content licenses, or IP that a rival cannot recreate from scratch. | 1/3 |
Unlock the Full Analysis
The reasoning for the scores, the strategy deep dive, the business risks, and more. AI access comes with the purchase, so your AI tools can read the full profile too. You keep 12 months of access.
One-time purchase: $20 per profile.
UnlockReading several? Unlock the entire catalog.
| Id | Source | Tier | Accessed |
|---|---|---|---|
| f1 | Prompt Security: AI Security Company | official | 2026-07-09 |
| f2 | SentinelOne to acquire Prompt Security (announcement) | official | 2026-06-07 |
| f3 | CTech on the Prompt Security Series A | press | 2026-06-12 |
| f4 | Wikipedia entry for Prompt Security | other | 2026-06-12 |
| f5 | AI Defense Matrix Catalog entry | other | 2026-06-07 |
| f6 | AI Defense Matrix Catalog mapping | other | 2026-06-14 |
| Id | Source | Tier | Accessed |
|---|---|---|---|
| s1 | Prompt Security homepage, HiBob global CISO testimonial “SECURE YOUR AI. EVERYWHERE IT MATTERS.” | official | 2026-06-28 |
| s2 | Solutions for employees page “Instantly detect and monitor all AI tools used within the organization to eliminate Shadow AI risks, and see which are the riskiest apps and users.” | official | 2026-06-28 |
| s3 | Homegrown AI apps solution page “Instantly secure your homegrown AI apps from Prompt Injection, Jailbreaks, Denial of Wallet, RCE and other risks.” | official | 2026-06-28 |
| s4 | Agentic AI security and governance solution page “MCP risk scoring, dynamically assessing over 13,000 MCP servers on GitHub to identify emerging threats” | official | 2026-06-28 |
| s5 | AI red teaming solution page “Prompt Security's Automated AI Red Teaming identifies critical risks like prompt injection, data exposure, and unsafe agent behavior, with actionable reports and clear remediation guidance.” | official | 2026-06-28 |
| s6 | About page, SentinelOne branded, Prompt Security built into the Singularity Platform “Prompt Security is built into the SentinelOne Singularity Platform. Governance policies and AI risk visibility are managed from the same console that covers endpoint, cloud, identity, and data security, giving teams a unified view across traditional and AI-specific threats.” | official | 2026-07-02 |
| s7 | Customer page with 10x Banking, Cymulate, and Ion Bank “Prompt Security has allowed us to be enablers for the business. We're able to expand AI use across the company while keeping it safe and proportionate.” | official | 2026-06-28 |
| s8 | CTech: SentinelOne buys two-year-old GenAI startup Prompt for $250M “Calcalist has learned that SentinelOne is acquiring Prompt Security in a blue-and-white deal valued at approximately $250 million.” | press | 2026-06-28 |
| s9 | CTech: M&A spotlight shifts to Lasso, Aim, and Pillar after the Prompt deal “In April, Palo Alto fired the opening shot in a consolidation wave with its $700 million acquisition of Protect AI. In May, U.S.-based Tenable acquired Israeli startup Apex for $100 million. Cisco quietly made its own move last year, buying Israeli company Robust for $500 million.” | press | 2026-06-28 |
| s10 | Prompt Security blog: Prompt Security + SentinelOne, A New Chapter Begins “We protect millions of AI interactions on a monthly basis, preventing prompt injections, data leakage, misuse, and ungoverned access. And we have scaled a multi-million-dollar ARR business, in record time.” | official | 2026-07-02 |
| s11 | Globes: SentinelOne to buy Israeli startup Prompt Security, up to 5x its $60M November 2024 valuation “In total the Tel Aviv-based company raised just $23 million.” | press | 2026-06-28 |
| s12 | CTech: Prompt Security raises $18 million Series A “Prompt Security was founded in August 2023 by Itamar Golan (CEO) and Lior Drihem (CTO), both graduates of Israel's elite 8200 Unit. Itamar previously founded the AI divisions at Check Point and Orca Security.” | press | 2026-06-28 |
| s13 | SentinelOne Form 10-Q for the quarter ended October 31, 2025 “On September 5, 2025, we completed the acquisition of Prompt Security, Inc. We acquired 100 % of the shares of Prompt for a total consideration of approximately $133.6 million in cash, 1,555,099 shares of our Class A common stock, and 415,109 assumed options” | regulatory | 2026-06-28 |
| s14 | Gartner Peer Insights: Prompt Security 4.6 average, 22 ratings (Bright Data render probe 2026-07-02, industry mix login-gated) “Detection rules are false positive heavy and very hard to tune. Detections are not context aware, so false negatives are also high.” | other | 2026-07-02 |
| s15 | Trust subdomain probe of trust.prompt.security via curl, 2026-07-02, HTTP 403 with a Cloudflare error code 1014 body, no readable portal | other | 2026-07-02 |
| Id | Source | Tier | Accessed |
|---|---|---|---|
| s1 | Prompt Security homepage, HiBob global CISO testimonial “SECURE YOUR AI. EVERYWHERE IT MATTERS.” | official | 2026-06-28 |
| s2 | Solutions for employees page “Instantly detect and monitor all AI tools used within the organization to eliminate Shadow AI risks, and see which are the riskiest apps and users.” | official | 2026-06-28 |
| s3 | Homegrown AI apps solution page “Instantly secure your homegrown AI apps from Prompt Injection, Jailbreaks, Denial of Wallet, RCE and other risks.” | official | 2026-06-28 |
| s4 | Agentic AI security and governance solution page “MCP risk scoring, dynamically assessing over 13,000 MCP servers on GitHub to identify emerging threats” | official | 2026-06-28 |
| s5 | AI red teaming solution page “Prompt Security's Automated AI Red Teaming identifies critical risks like prompt injection, data exposure, and unsafe agent behavior, with actionable reports and clear remediation guidance.” | official | 2026-06-28 |
| s6 | About page, Prompt Security from SentinelOne “Ship AI. Not Risk.” | official | 2026-06-28 |
| s7 | Customer love page, served HTML carries an ion-bank.png customer logo image alongside named 10x Banking and Cymulate testimonials “Prompt Security has allowed us to be enablers for the business. We're able to expand AI use across the company while keeping it safe and proportionate.” | official | 2026-07-02 |
| s8 | CTech: SentinelOne buys two-year-old GenAI startup Prompt for $250M “Calcalist has learned that SentinelOne is acquiring Prompt Security in a blue-and-white deal valued at approximately $250 million.” | press | 2026-06-28 |
| s9 | CTech: M&A spotlight shifts to Lasso, Aim, and Pillar after the Prompt deal “SentinelOne announced on Tuesday that it is acquiring Israeli startup Prompt Security in a cash-and-stock deal valued at $250 million.” | press | 2026-06-28 |
| s10 | Prompt Security blog: Prompt Security + SentinelOne, A New Chapter Begins “We protect millions of AI interactions on a monthly basis, preventing prompt injections, data leakage, misuse, and ungoverned access. And we have scaled a multi-million-dollar ARR business, in record time.” | official | 2026-07-02 |
| s11 | Globes: SentinelOne to buy Israeli startup Prompt Security “This is an impressive cybersecurity exit, without the involvement of large Israeli venture capital funds, but with a combination of small funds that invested modest amounts in an AI cybersecurity company.” | press | 2026-06-28 |
| s12 | CTech: Prompt Security raises $18 million Series A “Prompt Security was founded in August 2023 by Itamar Golan (CEO) and Lior Drihem (CTO), both graduates of Israel's elite 8200 Unit. Itamar previously founded the AI divisions at Check Point and Orca Security.” | press | 2026-06-28 |
| s13 | SentinelOne Form 10-Q for the quarter ended October 31, 2025 “On September 5, 2025, we completed the acquisition of Prompt Security, Inc. We acquired 100 % of the shares of Prompt for a total consideration of approximately $133.6 million in cash, 1,555,099 shares of our Class A common stock, and 415,109 assumed options” | regulatory | 2026-06-28 |
| s14 | Gartner Peer Insights: Prompt Security, 4.6 from 20 reviews across banking, energy and utilities, retail “Detection rules are false positive heavy and very hard to tune. Detections are not context aware, so false negatives are also high.” | other | 2026-06-28 |
| s15 | Trust subdomain probe, no public collateral resolved (HTTP 403) | other | 2026-06-28 |
This site is an experimental research aid created by Zeltser Security Corp. All its data gathering and analysis was performed autonomously without human review, and it can contain errors of fact, interpretation, and judgment that a human reviewer might catch.
The analyses are statements of opinion, not statements of fact. Machine analysis produced the scores, summaries, and matrix placements by weighing the public sources each page cites, and reasonable people can weigh the same sources differently. Where a page states a fact, it cites the public source and the date it was checked, and the statement is only as accurate as that source. Unless a profile expressly says otherwise, the analysis involves no hands-on testing and no independent validation of any company's products or services.
Nothing here is professional, security, legal, financial, investment, or purchasing advice, and nothing here is a recommendation to invest in, do business with, or avoid any company. Inclusion of a company is not an endorsement, and absence of a company is not a judgment about it. Reading this site creates no advisory or client relationship. Verify any detail you plan to act on against the vendor's current materials.
The content is provided "as is" and "as available," with all warranties disclaimed, express or implied, including merchantability, fitness for a particular purpose, accuracy, and non-infringement. No entry is warranted to be complete, current, or correct. Companies change, vendors update their claims, sources can be wrong, and automated analysis can misread them.
To the fullest extent permitted by law, the operator, Zeltser Security Corp, is not liable for any damages that arise from using this site or relying on its content, including direct, indirect, incidental, special, and consequential damages and lost profits, even if advised that such damages were possible. If you are dissatisfied with the site or disagree with these terms, your remedy is to stop using it.
Entries link to vendor pages, press coverage, and other external sites that Zeltser Security Corp does not control and is not responsible for. A link is not an affiliation with the destination or an endorsement of it. Product and company names and trademarks are the property of their owners, used here nominatively to identify the companies described. Short quotations from cited sources appear for identification and commentary.
Do not republish its content or share access without the operator's permission.