prompt security
Track on RadarAcquired by SentinelOne · 2025 · news
Security platform protecting AI apps and agents from prompt injection attacks
- Total raised
- $23M
- Employees
- 46
- Founded
- 2023
- Momentum
- 29
Stalling
Data updated August 2026
About
About prompt security
At a glance
prompt security is a cybersecurity company specializing in AI Security, founded in 2023 and headquartered in New York, United States. It has raised $23M in total funding, employs about 46 people, and was acquired by SentinelOne in 2025.
Prompt Security provides security solutions designed to protect AI applications and agentic systems from prompt injection attacks and other AI-specific threats. The company focuses on securing large language model (LLM) implementations, including homegrown AI applications, RAG pipelines, and autonomous agents that operate across enterprise environments. Their platform offers context-aware protections that analyze multi-turn conversations and detect threats that span multiple interactions, addressing attacks that traditional single-prompt security measures cannot identify. The company's research has demonstrated vulnerabilities in AI systems including embedding-level prompt injection in RAG pipelines, dependency hijacking through marketplace skills, and goal hijacking via hidden instruction layers in development environments. Prompt Security addresses security challenges that emerge as AI systems transition from assistive tools to autonomous agents with persistent access to organizational systems. Their approach includes real-time monitoring, policy enforcement, and visibility into AI application behavior. The platform is designed for enterprises deploying AI applications that require operational controls, particularly in environments where AI agents have access to sensitive data, execute actions autonomously, or integrate with multiple business systems. The company conducts ongoing research into AI security vulnerabilities and publishes findings on emerging attack vectors in agentic AI systems, LLM-powered applications, and AI development tools.
Momentum
How prompt security is trending
Momentum score
Score history appears once we have at least two monthly snapshots.
Pillar breakdown
Pillar breakdown locked
Growth, Market & Financial sub-scores
Valuation
What prompt security is worth
Estimated valuation
Funding
Funding history
See every round, lead investor, and the full capital stack.
Open the full profile on Mandos to see funding history.
Public markets
Stock performance
Privately held
This company isn't publicly traded. Stock performance will appear here after an IPO.
Headcount
Headcount growth
Track hiring velocity, department mix, and seniority shifts.
Open the full profile on Mandos to see headcount growth.
Jobs
Open jobs
Every live posting, hiring pace, and role-level signal.
Open the full profile on Mandos to see open jobs.
Web traffic
Digital presence
Visits trend, bounce rate, engagement, and top countries.
Open the full profile on Mandos to see digital presence.
Tech stack
Technologies
The full stack behind the product — frameworks, clouds, security.
Open the full profile on Mandos to see technologies.
M&A
Acquisitions
Every acquisition this company has made, with dates and amounts.
Open the full profile on Mandos to see acquisitions.
Reviews & sentiment
Employee & product reviews
CEO approval, culture, comp, and detailed product ratings.
Open the full profile on Mandos to see employee & product reviews.
Leadership
Full leadership team
CEO, CxOs, VPs, and every exec with roles.
Open the full profile on Mandos to see full leadership team.
Competitors
Competitive landscape
The complete competitor set with overlap and positioning.
Open the full profile on Mandos to see competitive landscape.
News
Press & news coverage
The most recent mentions, announcements, and media coverage.
Open the full profile on Mandos to see press & news coverage.
Full profile
This public profile is a snapshot
The full Mandos profile of prompt securityadds funding rounds & investors, valuation estimates, headcount & hiring trends, technology stack, executive moves, and real-time monitoring.
FAQ
Frequently asked questions about prompt security
When was prompt security founded?▾
prompt security was founded in 2023.
Where is prompt security headquartered?▾
prompt security is headquartered in New York, United States.
How much funding has prompt security raised?▾
prompt security has raised a total of $23M in total funding.
Is prompt security public or private?▾
prompt security is a privately-held company.
How many employees does prompt security have?▾
prompt security has approximately 46 employees.
