Arceus is a San Francisco-based AI-native law firm that pairs licensed attorneys with AI agents and its proprietary CounselOS platform to deliver commercial legal work — contract review, drafting and negotiation — at flat, upfront prices for startups and fast-growing companies. Standard reviews are guaranteed within eight hours or they are free, with most completed in three to five hours, and matters come in through Slack and email while context is gathered from tools such as Salesforce, HubSpot and Gmail. Founded in 2026 by CEO Mac Liu, the firm started with commercial contracts and is expanding into employment, privacy and broader general-counsel work.
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Oct 1, 2026
Latest raise
Funding activity · 1 round
Oct 1, 2026
$17M
Series A
Led by Greycroft
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