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Sandstone builds AI tools to streamline legal workflows for in-house teams.
Founded in 2025 and based in New York, US, Sandstone develops AI tools for legal teams, including agents deployed through playbooks and integrations with over 30 technologies. In June 2026, it raised USD 30 million in Series A funding led by Lightspeed Venture Partners, with participation from Mantis, SV Angel, Kearny Jackson, Daybreak, Sequoia, Operator Partners, and Litquidity. The company plans to expand its workflow automation and relationship management platform.
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