Harmonic Security

Harmonic Security

Zero-touch data protection platform for AI

Overview

Harmonic Security provides a zero-touch data protection platform for enterprises to govern AI usage and prevent sensitive data from leaving the organization. Its Harmonic Protect product uses specialized pre-trained language models to detect sensitive data quickly without manual labeling or complex rules, and Maestro can be configured in plain English to recognize context-specific data. Instead of traditional rule-based DLP, it guides end users to safer data practices and focuses on reducing Shadow AI and insider risk with faster, contextual protection. Its goal is to let companies adopt AI tools safely and compliantly by providing end-to-end data protection across all data exits.

About Harmonic Security

Simplify's Rating
Why Harmonic Security is rated
B-
Rated B on Competitive Edge
Rated B on Growth Potential
Rated C on Differentiation

Industries

Data & Analytics

Enterprise Software

Cybersecurity

AI & Machine Learning

Company Size

51-200

Company Stage

Series A

Total Funding

$24.5M

Headquarters

San Francisco, California

Founded

2023

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Simplify's Take

What believers are saying

  • August 5, 2026 Climb gives Harmonic immediate access to mid-market enterprise buyers.
  • The 2024 IQT investment and 2026 SOC 2, EU-US hosting support regulated sales.
  • Harmonic’s browser, desktop, and agentic-layer controls fit 2026 enterprise AI rollout needs.

What critics are saying

  • Microsoft Purview, Netskope, and Palo Alto Networks bundle similar AI data controls by 2027.
  • Channel dependence rises after the August 5, 2026 Climb deal; reseller economics squeeze margins.
  • If enterprise AI governance commoditizes, Harmonic becomes a feature, not a standalone company.

What makes Harmonic Security unique

  • Alastair Paterson and Bryan Woolgar-O’Neil built Digital Shadows before Harmonic Security, sold 2022.
  • Harmonic’s May 2024 Insights and 2026 Protect platform target Shadow AI with inline controls.
  • July 2026 Climb distribution expands Harmonic across U.S. VARs and MSPs fast.

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Funding

Total Funding

$24.5M

Above

Industry Average

Funded Over

2 Rounds

Series A funding typically happens when a startup has a product and some customers, and now needs funding to scale. This money is usually used to grow the team, expand marketing, and improve the product. Venture capital firms are frequently the main investors here.
Series A Funding Comparison
Above Average

Industry standards

$15M
$8.2M
Discord
$15M
Canva
$17.5M
Harmonic Security
$30M
Kalshi

Benefits

401(k) Retirement Plan

Company Equity

Paid Vacation

Hybrid Work Options

Growth & Insights and Company News

Headcount

6 month growth

2%

1 year growth

0%

2 year growth

1%
StackAware
Jul 14th, 2026
StackAware and Harmonic Security partner to strengthen enterprise AI governance.

StackAware and Harmonic Security partner to strengthen enterprise AI governance. Making AI governance a reality with real-time enforcement. Jul 14, 2026 Companies have moved beyond asking whether employees use AI. The key questions are now how, for what, and with what data. That's why I'm pumped to announce a partnership with Harmonic Security. Together, Stackaware'll help firms deploy AI securely by maintaining visibility into how it is actually used across the enterprise. AI governance, at its core, requires more than policies. Organizations also need technical controls that can: * Identify AI use * Reduce sensitive data exposure * Help employees make safer decisions in real time * Reveal how AI is used across business functions * Detect high-risk prompts before they become security incidents Harmonic Security provides exactly that enforcement layer through browser and endpoint-based visibility into AI applications, prompt activity, embedded AI features, desktop AI tools, and agentic workflows. StackAware complements those capabilities by helping organizations build the governance framework around AI adoption, including: * Risk assessments * Regulatory readiness * Policies and procedures * ISO 42001 implementation * Penetration testing and red-teaming And together, its customers will be able to move from just documenting AI risk to actively managing it. That is because Harmonic provides the technical visibility and inline controls needed to answer those questions while allowing employees to continue benefiting from AI. StackAware will help translate those technical findings into governance, compliance, and risk management activities that executives, auditors, customers, and regulators increasingly expect. Its shared goal is straightforward: Enable firms to realize AI's business value while managing cybersecurity, privacy, and compliance risk. By combining governance with technical enforcement, customers gain a more complete approach to responsible AI adoption. If your organization is evaluating AI governance, ISO 42001, or controls around employee AI use, get in touch.

Autocomply AI
Feb 20th, 2026
Autocomply Welcomes Harmonic Security as a CoDPO Customer

Autocomply welcomes Harmonic Security as a CoDPO customer. Adam Mitcheson 19 February 2026 Autocomply AI Inc. is pleased to share that Harmonic Security is now a customer of Autocomply, adopting CoDPO to support their compliance operations. Harmonic is a security-first AI company operating at the forefront of trust, governance, and regulatory readiness. Like many fast-growing teams, they face increasing compliance demands alongside the need to move quickly on product, customers, and security. While Harmonic has deep technical and security expertise, the execution of compliance work still creates operational drag. From maintaining documentation and responding to regulatory requirements, to ensuring compliance tasks are handled consistently as the business scales. That execution burden is exactly what CoDPO is designed to remove. CoDPO acts as an execution layer for compliance, embedding DPO-level reasoning directly into day-to-day workflows rather than relying on static documents, spreadsheets, or periodic audit exercises. It supports teams across a wide spectrum, from those with in-house compliance expertise to teams navigating regulatory obligations for the first time. Over recent months, Autocomply AI Inc. has worked closely with the Harmonic team to ensure CoDPO fits real-world security and compliance operations. That collaboration has now translated into Harmonic rolling CoDPO out internally as a customer. "Teams like Harmonic show that even organisations with strong compliance understanding don't want compliance to slow them down," said Adam Mitcheson, Founder of Autocomply. "CoDPO exists to take the execution burden off teams, so compliance keeps pace with the business." Autocomply AI Inc. is excited to continue working with Harmonic and to see CoDPO supporting them day-to-day. If you're building in a regulated environment and want compliance to be operational, continuous, and embedded rather than manual and reactive, Autocomply AI Inc.'d love to talk.

Brown Brothers Media
Apr 16th, 2025
Harmonic Is Recognized As A Representative Vendor For Data Loss Prevention By Gartner(R)

Harmonic listed in latest Gartner ‘market guide for data loss prevention’LONDON SAN FRANCISCO–(BUSINESS WIRE)–Harmonic Security has been recognized by analyst firm Gartner and listed among 20 ‘Representative Vendors in Data Loss Prevention’.The report states that ‘today, the DLP market is evolving to address the well-known limitations of traditional approaches to DLP, which relied heavily on resource-intensive, data-centric content inspection and often led to performance issues with high numbers of false positives.’. Instead, the firm notes that ‘the DLP market is moving in a direction where more sophisticated detection logic and additional analytics (either data or identity) are necessary to increase the fidelity of DLP alerts.’ Also that ‘by 2027, 70% of CISOs in larger enterprises will adopt a consolidated approach to address both insider risk and data exfiltration use cases.’. Alastair Paterson CEO and co-founder of Harmonic Security said: “I believe Gartner correctly outlines how organizations are pursuing DLP to control access to sensitive information in an era exacerbated with the mainstream adoption of generative AI and continued sprawl of organizational data. Harmonic has built a completely new approach to data protection using pre-trained, specialized language models. Our ambition is to redefine the entire data protection category which GenAI has brought into sharp focus.”

Business Wire
Oct 3rd, 2024
Harmonic Security Raises $17.5 Million Series A to Accelerate Zero-Touch Data Protection to Market

Harmonic Security today announces it has secured $17.5 Million in Series A funding to bring its unique “zero-touch data protection” capabilities to en

Help Net Security
Oct 2nd, 2024
Harmonic Security raises $17.5 million to improve data security for organizations

Harmonic Security has secured $17.5 million in Series A funding to bring its "zero-touch data protection" capabilities to enterprises.

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