Sandstone
2 known investors
Sandstone is an AI-native legal relationship management platform for in-house corporate legal departments.
Also known as Sandstone AI
Founders & leadership
Investors · 2
Also in the syndicate · 1
Company profile
researched Aug 2026Sandstone is a legal technology company that sells an AI-native platform for in-house legal departments, which it describes as "Legal Relationship Management." The product consolidates legal requests, documents, counterparties, stakeholders, matters, obligations, contracts and prior decisions into a single working surface, and applies AI agents across intake, triage, drafting, review and knowledge retrieval. Intake is captured from the channels where legal work already originates — email, Slack and other messaging, ticketing systems such as Jira, and other business tools — after which agents interpret intent, gather context from connected systems such as Salesforce and CLMs, and route work to the counsel with the appropriate expertise and capacity.
Additional modules include a knowledge repository with playbooks built from a company's existing templates, redlines and policies that update with use; a context map that surfaces counterparty history, prior negotiations, precedent, urgency and deal value alongside an incoming request; agentic workflows that redline, draft, reply to comments and cite multiple sources while respecting system permissions; and natural-language reporting on cycle times, risk exposure, capacity and playbook deviation rates. The company routes tasks to different large language models depending on the use case, including OpenAI GPT and Anthropic Claude models, with the stated aim of matching task complexity to model cost and removing the need for lawyers to select models or write prompts.
The platform is aimed at General Counsel, chief legal officers, associate and assistant GCs, practice area leads and legal operations professionals at scaling companies and enterprises.
Founding story
Sandstone was co-founded by Nick Fleisher, a former McKinsey consultant who served general counsel and mid-market in-house legal teams and became an engagement manager in 18 months, and Jarryd Strydom, also a McKinsey alum and a former in-house attorney. The founders' premise was that AI could give understaffed mid-market in-house legal teams leverage, and that in-house legal context is typically scattered across email, chat, contracts and point tools. Fleisher serves as CEO and Strydom as chief operating officer.
Business model
Sandstone sells software to corporate legal departments, with a paying customer base described at launch as a mix of smaller legal departments and a small number of Fortune 500 companies. Series A proceeds are earmarked for expanding the enterprise offering and hiring across functions, including onboarding and customer support staff who combine legal and technical backgrounds.
Software sold to in-house legal departments; the company reported paying customers at its January 2026 launch and stated revenue growth of more than 40x over the subsequent 90 days.
Traction
Sandstone had a "couple dozen" paying customers at its January 2026 public launch, spanning smaller legal departments and a couple of Fortune 500 companies. In June 2026 the company reported that revenue had grown by more than 40x over the prior 90 days and that it had onboarded customers including Wayfair, Grindr, Mercury, Cox Media and ElevenLabs.
Latest developments
On 9 June 2026 Sandstone announced a $30 million Series A led by Lightspeed Venture Partners, with participation from Mantis VC, SV Angel, Operator Partners, Kearny Jackson, Daybreak Ventures and Litquidity Ventures. Proceeds are directed at expanding the enterprise offering and hiring across functions. Alongside the round the company reported over 40x revenue growth in the prior 90 days and new customers including Wayfair, Grindr, Mercury, Cox Media and ElevenLabs.
▸Full profile — market position, technology, go-to-market, geography, history, risks & controversies
Market position
Sandstone targets in-house legal departments, a segment described in press coverage as underserved relative to the private-practice focus of larger legal AI companies such as Harvey and Legora. Its investor Sequoia has also backed Harvey, Crosby and Ironclad. PYMNTS reported that funding to legal technology startups surpassed $2.4 billion in the first nine months of 2025.
Management positions Sandstone against two adjacent categories: contract lifecycle management systems, which it characterizes as document-centric systems of record with limited workflow capability, and Slack-based intake or "control tower" tools, which route requests without understanding them. Sandstone's stated differentiators are multi-channel intake, a single context layer spanning legal decisions, and adaptive agentic workflows rather than fixed templates. A Bloomberg Law report noted competitors GC AI and Spellbook also target in-house teams, with co-founder Fleisher arguing they incorporate less broader business context.
Technology
An AI-native workflow and context layer for legal work. Sandstone builds a unified context layer of playbooks, precedent and business rationale, integrates with Slack, email, CLMs, Salesforce and other systems in the customer stack, and runs self-learning agentic workflows for intake, triage, drafting, review and retrieval. The company selects among frontier large language models — including OpenAI's GPT and Anthropic's Claude — based on the task, positioning routing and integration rather than raw model reasoning as the differentiator.
Go-to-market
The company sells directly to legal departments via demo requests on its website, supported by a roster of advisors and customer advocates drawn from general counsel and legal operations roles at established companies, plus a launch publicity cycle around its seed and Series A announcements.
In-house legal departments, with an initial focus on small and mid-sized businesses and mid-market legal teams, alongside some large enterprise and Fortune 500 legal organizations. Named buyer personas include General Counsel, CLOs, associate and assistant GCs, practice area leads and legal operations professionals.
Geography
Headquartered in New York, NY, United States, with an office in Brooklyn. Customers are described as US-based in origin, with the company noting work touching cross-border legal questions such as EU data retention and hiring matters.
History
Sequoia partner Bogomil Balkansky was introduced to Nick Fleisher by Sequoia's talent team and led the company's pre-seed round two months after their first meeting. The founders built an MVP in weeks and put it in front of customers, and Sequoia subsequently led the seed round. Sandstone launched publicly on 13 January 2026 with $10 million in seed funding led by Sequoia Capital, with SV Angel, Kearny Jackson and more than 20 general counsel participating. Six months later, in June 2026, the company announced a $30 million Series A led by Lightspeed Venture Partners.
Risks & controversies
Coverage notes competitive pressure from frontier AI labs moving into legal work — Anthropic expanded its Claude for Legal offering with case law search and deposition preparation tools — as well as from well-capitalized legal AI companies such as Harvey, which raised $200 million in March at an $11 billion valuation. Legal technology has historically been a difficult market, and Sandstone's model depends on integrations into customer systems and on selecting appropriate third-party models.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Timeline · 3
launches, deals, and filingsSandstone announced a $30 million Series A led by Lightspeed Venture Partners, with participation from Mantis VC, SV Angel, Operator Partners, Kearny Jackson, Daybreak Ventures and Litquidity Ventures. Funds are earmarked for expanding the enterprise offering and hiring.
$30M source ↗
Alongside its Series A, Sandstone said it had onboarded customers including Wayfair, Grindr, Mercury, Cox Media and ElevenLabs and increased revenue by over 40x in the prior 90 days.
Sandstone launched publicly with $10 million in seed funding led by Sequoia Capital, with SV Angel, Kearny Jackson and more than 20 general counsel also investing. Sequoia had previously led the company's pre-seed round.
$10M source ↗
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
▸Research sources · 8
primary sources listed
- Sandstonesandstone.ai · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Sandstone do?
- Sandstone is an AI-native legal relationship management platform for in-house corporate legal departments.
- Who founded Sandstone?
- Sandstone was founded by Jarryd Strydom.
- Who are Sandstone's investors?
- Sandstone's investors include Mantis Capital.