California-Based Reach Security Raises Over $50M in Series B Funding

Reach Security, a San Francisco, CA-based provider of an AI platform that operates security defenses at machine speed, has raised over $50 million in a Series B funding round.

The round was led by Top Tier Capital Partners with participation from Ballistic Ventures, In-Q-Tel, M12, Microsoft’s Venture Fund and existing investors.

The company will use the funding to develop its products, expand integration partnerships, enter international markets, and grow its presence in the US enterprise and federal markets.

What is Reach Security?

Reach Security provides an AI-powered cybersecurity platform that helps businesses check whether their security defences are working as intended.

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The platform analyses the live configuration of security products already used by an organisation to identify whether potential attack paths are blocked or remain accessible. It can also identify the specific security rule affecting a risk and help fix gaps in protection.

Reach uses AI to help security teams prioritise vulnerabilities and misconfigurations that attackers could actually exploit. Its technology can also adjust existing security controls to close potential entry points without requiring organisations to replace their current tools.

How Much Funding Has Reach Security Raised?

Reach Security has raised over $50 million in its latest Series B funding round.

The source does not provide details of previous funding rounds or the company's total funding raised to date.

Who Invested in Reach Security’s Series B?

The Series B round was led by Top Tier Capital Partners.

Other participating investors include:

• Ballistic Ventures
• In-Q-Tel
• M12
• Microsoft’s Venture Fund
• Existing investors

Why the Funding Matters

Reach Security will use the new funding to support product innovation, expand integration partnerships, and strengthen its presence in US enterprise and federal markets.

The investment will also support international expansion as the company develops its AI-powered security platform and connects its technology with more enterprise security systems.

Who founded Reach Security?

Reach Security was founded in 2021 by Garrett Hamilton and Colt Blackmore. The company is headquartered in San Francisco, California.

"What is old is new again in security. AI has given attackers better economics and a lower barrier to entry, but it has also given defenders a chance to use their home field advantage more than ever," said Garrett Hamilton, CEO and co-founder of Reach Security.

"Trust is built on evidence, not assumptions. With AI accelerating attack and defense alike, we need continuous proof that our controls are doing their job," said Sebastian Goodwin, Chief Trust Officer at Autodesk. "Reach is our source of truth. Our team gets its time back by working only on the exposures our controls aren't already covering.

Market and Business Growth

Reach Security has launched Reach Everywhere, which makes its security control insights available across enterprise defence platforms, workflows, APIs, and AI systems.

The platform continuously discovers, analyses, and validates security controls to help organisations identify attack paths and check whether their protections are effective.

The company also highlighted growing challenges for cybersecurity teams as AI increases the speed of attacks. According to the source, CrowdStrike's 2026 Global Threat Report found that AI-enabled adversary operations had increased by 89%, while attacker breakout times had fallen to as little as 27 seconds.

Reach aims to help organisations respond to these threats by using AI to review security controls, prioritise risks, and address gaps in protection.

What Happens Next?

Reach Security plans to continue developing its platform, expand integration partnerships, and grow across US enterprise, federal, and international markets.

Through Reach Everywhere, the company also aims to make continuously validated security data available to the tools and AI systems organisations use to make security decisions.

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