Sandstone

Sandstone is an AI-native operating system for in-house legal teams. It unifies a company's legal data, workflows, and business context into a single system that lives inside the tools teams already use - Slack, email, Salesforce, Jira - and deploys AI agents to handle intake, triage, drafting, and redlining. Founded in 2025 by ex-McKinsey and practicing-lawyer trio Nick Fleisher, Jarryd Strydom, and Liam Germain, the New York company launched publicly in January 2026 with a $10M Sequoia-led seed and followed with a $30M Series A led by Lightspeed five months later.