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
C+
Rated C 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

People at Harmonic Security

People at Harmonic Security who can refer or advise you

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Simplify's Take

What believers are saying

  • Harmonic secured $17.5M Series A in October 2024, enabling rapid scaling of its AI governance platform.
  • In-Q-Tel invested in May 2024, signaling deep trust in Harmonic's national security-grade AI risk management.
  • With 300x faster leak detection than general LLMs, Harmonic addresses Shadow AI blindspots on personal devices.

What critics are saying

  • Glean and BigID launched 2025 AI data security suites, directly threatening Harmonic's zero-touch niche within 6–12 months.
  • OneTrust's 2025 AI Governance Suite includes shadow AI detection, eroding Harmonic's unique value for CISOs immediately.
  • A breach in Harmonic's pre-trained LLM pipeline could invalidate detection accuracy, destroying trust and killing the company.

What makes Harmonic Security unique

  • Harmonic uses pre-trained LLMs to detect sensitive data without manual labeling, unlike legacy DLP.
  • Its Maestro feature lets CISOs configure policies in plain English, slashing onboarding time and rule complexity.
  • The platform nudges end-users directly toward safe AI behavior, reducing security team alerts and workload.

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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

2%

2 year growth

0%
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.

Harmonic Security
May 1st, 2024
Harmonic Security - Harmonic Insights launches: enabling enterprises to adopt GenAI without worrying about the security or privacy of their data.

London and San Francisco, 1 May 2024: Harmonic Security has today announced the general availability of Harmonic Insights. The data security platform monitors and secures sensitive data in the age of generative AI (GenAI) so organizations can adopt this nascent technology safely. The company is also pleased to announce that In-Q-Tel, Inc. (IQT), the not-for-profit strategic investor for the US national security community and America’s allies, has also taken an investment in the firm. The two developments set the stage for the next growth phase of the company which launched in October 2023 with $7m in ‘seed’ funding from Ten Eleven Venture Capital as well as 14 other private investors.

Global Security Mag
May 1st, 2024
All our news in english

Harmonic Security has announced the availability of Harmonic Insights.

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