Portfolio

100+ checks. Where the atoms still matter.

Angel book concentrated where compute meets the physical world: AI infra, physical AI, aerospace and dual-use, and vertical software with real retention. A partial list — selected companies public or with permission to disclose.

100+
Investments
2024
First check
04
Core theses
LA
Based
AI Infra & Compute 06 · chips · neoclouds · frontier labs

The picks, shovels, and power plants of the model economy — companies building the compute layer everyone else depends on.

Physical AI & Robotics 04 · embodied · dual-use

Systems that touch the world — and get harder to displace as they collect real-world data.

Aerospace & Dual-Use 01 · launch · defense

The atom-heavy end of the book — companies moving mass and hardware where it matters.

Vertical Software 04 · proof-of-revenue SaaS

Software with real retention and signed enterprise revenue.

Inbound

Actively writing checks in these three shapes.

01
Physical AI with defensible data loops
Robotics, dual-use hardware, and embodied systems that get harder to displace as they collect real-world data.
02
Neoclouds with real utilization economics
Compute infrastructure priced against actual load. Chips, edge compute, thermal & photonic bets.
03
Aerospace & vertical AI with a first customer
Dual-use aerospace and vertical software with signed enterprise revenue.
Pitch inbound Physical AI, neocloud, AI infra, frontier labs, dual-use aerospace. cj@cjsun.co · LinkedIn