We Came From the Lab, Not the Cap Table
Coexin Technology Partners invests $3–8M rounds in pre-Series A deep tech teams — semiconductors, quantum systems, photonics, and advanced materials — from our base on Sand Hill Road. Founded in 2017 with $270M under management, the fund was built specifically to hold positions for 10–12 years, because deep tech doesn't fit a five-year fund cycle.
The founding partners came from the lab: chip design at Intel and TSMC, quantum coherence research at MIT Lincoln Laboratory, fab process work at Applied Materials. That technical background shapes every investment decision — we review IP, reproduce experimental claims, and stress-test the physics before any financial conversation. No hand-waving on technical risk.
Our thesis: the most durable companies of the next thirty years will be built on physics breakthroughs. Semiconductors are mid-cycle on a fundamental architecture shift. Quantum computing is crossing from research discipline to engineering problem. Photonics is solving the interconnect bottleneck that copper cannot. We back the teams actually solving these problems, not the teams with the most convincing narrative about them.
Ten portfolio companies later, three of which have achieved significant technical milestones ahead of roadmap, the approach has validated itself. We've helped founders navigate government procurement, CHIPS Act funding, fab partnerships, and the messy reality of scaling laboratory processes into manufacturable products.
We don't require decks for initial conversations. If you're working on something that genuinely changes the physics, reach out to [email protected]. We respond to all inbound within 48 hours.
