O’Melveny Advises Sandstone on US$30M Series A Financing
June 22, 2026
FOR IMMEDIATE RELEASE
NEW YORK—June 22, 2026— O’Melveny advised Sandstone, a software platform for handling every legal relationship across intake, triage, knowledge, execution, and reporting, on securing US$30 million in a Series A round.
Lightspeed Venture Partners led the round, with participation from existing investors from Sandstone’s January Sequoia-led seed round, including Mantis VC, SV Angel, Operator Partners, Kearny Jackson, Daybreak Ventures, Litquidity Ventures, and others.
The O’Melveny team advising Sandstone was led by partner Viq Shariff and associates Caroline Newman and Conor Prouty.
About O’Melveny
It’s more than what you do: it’s how you do it. Across sectors and borders, in board rooms and courtrooms, we measure our success by yours. And in our interactions, we commit to making your O’Melveny experience as satisfying as the outcomes we help you achieve. Our greatest accomplishment is ensuring that you never have to choose between premier lawyering and exceptional service. So, tell us. What do you want to achieve? Visit us at www.omm.com; learn more in our firm at-a-glance; and find us on LinkedIn, Facebook, Instagram, and YouTube.
Contact:
Brandon Jacobsen
O’Melveny & Myers LLP
+1 213 430 8024
bjacobsen@omm.com
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Sandstone issued the following announcement:
Sandstone Raises $30M Series A Led by Lightspeed to Build the Legal Department of the Future
Investment will accelerate scaling, community building, and expand access to Sandstone's Legal Relationship Management platform for in-house legal teams
NEW YORK, NY — June 9, 2026 — Sandstone, the platform for managing every legal relationship, today announced it has closed $30 million in Series A financing led by Lightspeed Venture Partners, with participation from existing investors from the January seed round, including Mantis VC, SV Angel, Operator Partners, Kearny Jackson, Daybreak Ventures, Litquidity Ventures, and others. The round marks a pivotal milestone for the company as it accelerates product development and expands its platform to empower a new generation of AI-native legal departments.
Legal has historically operated across a fragmented collection of contracts, emails, tickets, and institutional memory. Sandstone brings those fragments together into a single platform, connecting counterparties, stakeholders, matters, obligations, contracts, and history into one working surface for legal teams. With legal context unified, teams can deploy AI across intake, triage, drafting, review, and knowledge retrieval with a complete understanding of the relationship behind the work. Where legacy tools like CLMs fragment work across disconnected applications, Sandstone unifies it, turning legal from a process bottleneck into a strategic partner.
The investment follows Sandstone's $10 million seed round led by Sequoia in January 2026 and reflects the company's rapid traction among in-house legal teams seeking a better way to operate. In the past 90 days, Sandstone has grown revenue by over 40x and onboarded customers like Wayfair, Hypertherm, Grindr, Mercury, MasterClass, Cox Media, and ElevenLabs, spanning industries from e-commerce to media to fintech. The company has also launched major product milestones — validating the market's demand for a unified platform that manages the full spectrum of legal relationships, beyond fragmented point solutions.
"We built Sandstone because in-house legal teams have been underserved by software for too long. The work, context, and history behind every decision are scattered across contracts, emails, tickets, and institutional memory. We're bringing those pieces together into a single place where legal can operate with complete context. This funding from Lightspeed gives us the fuel to expand capabilities and bring the legal department of the future to every company that needs it."
— Nick Fleisher, CEO and Co-Founder, Sandstone
Lightspeed's investment reflects industry conviction in vertical AI — purpose-built platforms that embed deeply into a profession's workflows rather than offering generic automation. Sandstone's approach, training AI on legal-specific context and integrating directly with how in-house teams actually work, positions it as a uniquely defensible platform in an underserved category.
"The best vertical AI companies win because they understand the profession as deeply as the technology. Sandstone has demonstrated that rare combination — a team that has lived these problems firsthand and the engineering ambition to solve them at scale. We believe Sandstone is building the defining platform for in-house legal."
— Guru Chahal, Partner, Lightspeed Venture Partners
The Series A will support three strategic priorities: scaling customer success infrastructure to support rapid enterprise onboarding, hiring top talent across all functions, and expanding Sandstone's community efforts for in-house legal professionals.
About Sandstone
Sandstone was born out of the acute frustration experienced by in-house legal teams who spend more time on process than progress due to fragmentation across disparate business systems. The platform provides a comprehensive solution for intake, triage, execution, fulfillment, and measurement of legal work — designed to run across email, messaging, and the business tools teams already use. Sandstone is headquartered in New York. To learn more, visit www.sandstone.com
MEDIA CONTACT
Maggie Pote
Head of Growth Marketing
press@sandstone.com
248-892-8333