Atrium
DefunctYC W18San Francisco, US · 180 employees · 2 known investors
Atrium provides legal services to startups through a technology-enabled platform that replaces traditional hourly billing with performance-based compensation and software tools designed to increase operational transparency and efficiency.
Founders & leadership· Y Combinator alumni (W18)
JK

Justin Kanin𝕏Founder/CEOJustin Kan founded Twitch and Justin.tv, and later co-founded Atrium, a legal services platform for startups. He has experience as a startup founder and investor.
Investors · 2
In the news
Government sells idle Atrium property in Makati for P1 billion | Philstar.comphilstar.com · Jul 2026
Dutch Construction Robotics Maker Monumental Raises $32M in Series B Fundingtheaiinsider.tech · Jul 2026Frequently asked questions
- What does Atrium do?
- Atrium provides legal services to startups through a technology-enabled platform that replaces traditional hourly billing with performance-based compensation and software tools designed to increase operational transparency and efficiency.
- Who founded Atrium?
- Atrium was founded by Justin Kan.
- Who are Atrium's investors?
- Atrium's investors include Y Combinator, Andreessen Horowitz.
- Where is Atrium headquartered?
- Atrium is headquartered in San Francisco, US.

