Seth Hallen
Founder | Managing Partner at Hallstone Ventures
Los Angeles, California
Seth Hallen, Founder | Managing Partner at Hallstone Ventures is an active investor based in Los Angeles, California. This profile covers what Seth Hallen backs, at which stage, and how founders can reach out in 2026.
Seth Hallen is the Founder and Managing Partner of Hallstone Ventures, a seed fund investing in AI infrastructure for the media, entertainment, and advertising economy.
Seth Hallen invests in Media & Content, Marketing & AdTech and Artificial Intelligence, typically at Seed.
- Location
- Los Angeles, California
- Typical check
- $250K
What does Seth Hallen invest in?
- Investor type
- VC
- Stages
- Seed
Where is Seth Hallen based?
Seth Hallen is based in Los Angeles, California.
- Browse more startup investors near Seth Hallen:
- Startup investors in Los AngelesStartup investors in CaliforniaStartup investors in the United States
How to reach Seth Hallen
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About this profile
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Cite this page
Round Funded. "Seth Hallen." Round Funded investor database, updated September 22, 2026.
Stable URL, it will not change: https://www.roundfunded.com/en/investor/seth-hallen
Frequently Asked Questions
Who is Seth Hallen?
Seth Hallen, Founder | Managing Partner at Hallstone Ventures is an active investor based in Los Angeles, California. Seth Hallen invests in Media & Content, Marketing & AdTech and Artificial Intelligence, typically at Seed.
What does Seth Hallen invest in?
Seth Hallen invests in Media & Content, Marketing & AdTech and Artificial Intelligence, typically at Seed. Match your sector and stage, then reach out with a personalized pitch.
What stage does Seth Hallen invest at?
Seth Hallen typically invests at Seed. Lead with traction that fits the stage when you reach out.
What is Seth Hallen's typical check size?
Seth Hallen typically writes checks around $250K. Use it as a signal for whether your raise fits their stage.
Where is Seth Hallen based?
Seth Hallen is based in Los Angeles, California.
How do founders reach investors like this?
Round Funded lists active investors with verified, professional contact details for signed-up founders. Filter by sector, stage and location, then send a personalized pitch from your own inbox.
What is Round Funded?
Round Funded is an investor database and outreach platform for startup founders. It lists 60,000+ active investors with verified contacts, filtered to recent investment activity, and lets founders send personalized pitches from their own Gmail, track replies, and share a free Data Room. Round+ starts at $99 per month with a 3-day trial.
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