Hallstone Ventures

Hallstone Ventures is a Los Angeles-based seed fund backing founders building AI-driven infrastructure for the modern attention economy. We invest in the foundational software layer behind how media is created, distributed, measured, protected, monetized, and experienced. Our focus spans creator infrastructure, AdTech and monetization rails, immersive and spatial media systems, and frontier media technologies. Led by media-technology operator Seth Hallen, Hallstone pairs sector focus with a 70+ LP network of operators and domain experts across media, entertainment, advertising, and technology. We back founders building durable technology for the next generation of creators, brands, platforms, and media companies. Fund I is closed to new investors. Nothing here should be construed as an offer to sell or solicitation of an offer to buy securities.