The company says its platform uses AI agents to investigate emails in real time as enterprises face increasingly sophisticated phishing and impersonation attacks generated with AI tools.

Ocean, an email security company, announced it raised $28 million in a round led by Lightspeed Venture Partners, with participation from Picture Capital and Cerca Partners. Additional investors included cybersecurity executives and founders associated with Wiz, Armis, and Cyberstarts.

Ocean just emerged from stealth with what it describes as an “agentic” email security platform designed to investigate emails autonomously rather than relying primarily on traditional detection-based filtering systems.

According to Shay Shwartz, CEO and co-founder, “Attackers now use AI to write flawlessly, reference real projects, and impersonate trusted colleagues, making it nearly impossible to spot the difference.”

The company said this makes it more difficult for employees and conventional email filters to detect fraudulent emails. The company said its platform analyzes sender behavior, message content, embedded links, technical infrastructure, and organizational context to determine whether an email is trustworthy.

Ocean said its central investigation engine, called “Ray,” reviews emails in real time and automates portions of the investigation and response process typically handled manually by security operations teams.

The company said the platform already processes more than 1 billion emails every month. Customers include KAYAK, Kingston Technology, and Headspace.