Harmonic Security vs Zenity

Harmonic Security sells software that shows security teams how employees and AI agents use generative AI tools and stops sensitive data from going into them. It was founded in 2023 (its About page dates the founding to August 2023) by CEO Alastair Paterson, the former chief executive of Digital Shadows, and CTO Bryan Woolgar-O'Neil. It launched in October 2023, jointly headquartered in London and San Francisco, and its privacy policy names Harmonic Security Limited in London and Harmonic Security Inc. in San Francisco. It says it has raised $76 million in total: a $7 million seed round led by Ten Eleven Ventures (October 2023), a $17.5 million Series A led by Next47 (October 2024) and a $50 million Series B led by Crosspoint Capital Partners, announced on October 14, 2026, when it reported more than 100 customers and more than 90 staff in the US and UK. We found no acquisition. The platform is sold as three packages. Explore uses a browser extension to find the AI tools in use and gives prompt-level visibility, usage intelligence, sensitive data detection and risk scores for each app; Harmonic says it covers more than 1,000 AI applications, including AI features inside SaaS tools. Guide adds an endpoint agent for desktop AI apps, IDEs and command-line tools such as Claude Code and Codex, inline coaching (block, warn or log), granular policies and webhook alerts for SIEM and SOAR tools. Command adds MCP client and server discovery, permissions on what agents may read, write and execute, and data protection inside agentic workflows; prompt injection detection is listed as coming soon. Its locally installed MCP Gateway, launched in October 2025, intercepts MCP traffic on Windows, macOS and Linux. Instead of pattern matching, Harmonic classifies prompts with its own small language models, which it says decide in under 200 milliseconds. **AI compliance coverage** Harmonic treats compliance as a by-product of governance. Its compliance page says it flags high-risk uses such as automated hiring screens and credit scoring "so you can apply the specific guardrails the EU AI Act and local laws require", keeps an audit trail of AI interactions, and blocks health and personal data from unapproved AI tools for HIPAA and GDPR. Documentation mapping its controls to specific regulations is available on request, as is EU hosting. For Harmonic itself, its trust center lists SOC 2 Type 2 and ISO/IEC 27001:2022, with a SOC 2 report available on request, and its site footer shows SOC 2 Type 2 and ISO 27001 badges. ISO/IEC 42001 and the NIST AI RMF also appear in the trust center's list, but the site shows no badge or certification claim for either. **Who it's for** Security and IT teams that want to let staff use ChatGPT, Claude, Copilot, Cursor and similar tools while keeping company data out of them. Harmonic has industry pages for technology, legal, insurance and healthcare, and its site quotes customers at Apax and Advisor360.

Zenity is a security and governance platform for AI agents: agents inside SaaS tools, agents built in-house on cloud AI platforms, and coding and personal agents on employee devices. It was co-founded by Ben Kliger (CEO) and Michael Bargury (CTO). It launched in April 2021 as a security platform for low-code/no-code development, added support for enterprise AI copilots in November 2023 and now focuses on agents. Research and development is in Tel Aviv, and go-to-market and operations are led from New York. Zenity says it has more than 230 employees. Its company page lists a $5 million seed round (November 2021), a $16.5 million Series A led by Intel Capital (September 2023), a strategic investment from Microsoft's M12 (July 2024), a $38 million Series B co-led by Third Point Ventures and DTCP (October 2024) and a $125 million Series C led by Norwest (August 2026). Zenity released a new version of its platform in August 2026, organized in three parts. Surface covers AI Observability (an inventory of agents, MCP servers, tools and data access, including agents built without security review), AISPM (configuration and permission checks before agents go live) and Exposure Management (which access paths are actually exploitable). Enforce covers Runtime Boundaries, which checks each agent action in real time and allows it, blocks it or shuts the agent down, including multi-step chains such as data exfiltration or privilege escalation; Agentic Identity, which gates actions on the identity an agent acts for in Okta or Microsoft Entra ID; and MCP Security, a gateway that allows, modifies or blocks tool calls and flags tool poisoning, rug pulls, shadow servers and over-scoped servers. Protect is AIDR, which detects direct and indirect prompt injection, data exfiltration, tool misuse and memory poisoning with LLM-based intent detection. Zenity names Microsoft 365 Copilot, Copilot Studio, Power Platform, ChatGPT Enterprise, Claude Enterprise, Salesforce Agentforce, ServiceNow, Amazon Bedrock and AgentCore, Google Vertex AI and Microsoft Foundry among the platforms it covers. For coding agents such as Cursor, Claude Code, Codex and GitHub Copilot, it collects activity through native agent hooks and OpenTelemetry and enforces policy through its MCP gateway. It sends agent findings to AWS Security Hub (in OCSF format) and to ServiceNow SecOps. **AI compliance coverage** Zenity maps its detections to the OWASP LLM Top 10 and MITRE ATLAS. We found no mapping on its site to the EU AI Act, the NIST AI RMF or ISO 42001. Its trust center says Zenity holds SOC 2 Type II and is ISO 27001 compliant and ISO 27701 compliant; reports are available on request. **Who it's for** Large enterprises running many agents across Microsoft, Salesforce, ServiceNow and OpenAI platforms, plus homegrown and coding agents, that want one policy layer over all of them. Zenity says most of its customers are Fortune 500 or Global 2000 companies; SoftBank Corp. is the only one named, in its Series C announcement. Gartner named Zenity a Cool Vendor in Agentic AI TRiSM (September 2025), and Zenity quotes an April 2026 Gartner report calling it the company to beat in AI agent governance.