Realm Labs

Realm Labs builds AI security tooling around what it calls internal observability: instead of only filtering prompts and outputs, its Prism product inspects attention patterns, chain-of-thought traces, and token probabilities inside large language models during inference. The company pairs that with OmniGuard, an AI firewall, and DataRealm, a data-governance and DLP tool aimed at AI systems, positioning the three as a suite for organizations that want visibility into how a model is reasoning, not just what it says.

Founded in 2023 by CEO Saurabh Shintre, a CMU PhD who previously led AI security research at Symantec and Splunk and served five years on RSAC’s AI/ML track committee, Realm Labs is headquartered in Sunnyvale, California. It raised a $5 million seed round from Crosspoint Capital Partners at RSAC 2026, with additional participation from Firestreak Ventures, First Rays Venture Partners, Silver Buckshot, and Tola Capital, and was named an RSAC 2026 Innovation Sandbox Top 10 finalist. Anthropic is a named early customer.

The internal-observability angle is a genuinely different technical approach from the input/output filtering most AI firewalls rely on, and having a frontier AI lab as a customer is a meaningful, independently notable signal for a company this young. That said, the seed-stage funding and single named customer mean the evidence base is still thin relative to the scale of claims about inspecting model reasoning.