Backing the Next Generation
of Climate Tech Builders
Capitol Stack is a pre-seed VC fund based in Washington, D.C., investing in founders emerging from the deepest policy, tech, and scientific talent pool.
Learn MoreOur Thesis
With the highest per-capita number of CS grads in the U.S. and a wave of technical talent emerging from DOE, EPA, and USAID, D.C. is poised to become the next frontier of climate innovation. We back mission-driven founders at the intersection of government, science, and software.
Why Capitol Stack
- Deep networks in government, tech, and academia
- Hands-on operational and fundraising support
- Experience building and scaling climate ventures
Portfolio Highlights
Selected investments from the founder's prior fund, Carbon Ventures
Fortify
Fortify is a Boston-based digital manufacturing company specializing in advanced composite materials for additive manufacturing.
Andium
Andium provides AI-powered remote field monitoring solutions to reduce greenhouse gas emissions and enhance operational efficiency in the energy sector.
SmarterX
SmarterX uses data and science to help brands and retailers safely manage regulated consumer products, reducing environmental harm and risk at scale.
Jason Cahill
Founder & Managing Director
Jason Cahill is the founder and Managing Director of Capitol Stack. He's a systems thinker who's spent the last two decades building at the intersection of infrastructure, technology, and impact. Before launching Capitol Stack, he led Amazon's Sustainable Cities program at AWS, founded his own startup, and invested in climate tech through Carbon Ventures.
Jason has a deep belief in backing people who know how systems work—because they helped run them. Many of the founders he supports come from public institutions like the Department of Energy, EPA, or USAID. They're mission-driven, often overlooked by traditional VCs, and ready to build what government can't.
He's also former US Army, a professor of entrepreneurship, and a firm believer that climate impact starts with founder-first capital.