Helicity Space

Cambridge Heavy Industries is an MIT spinout building benchtop, modular laser-driven (fast-ignition inertial confinement) fusion devices capable of 50-80 shots per day. It initially targets tritium and other high-value isotope production for the fusion fuel supply chain, with commercial fusion power as the long-term goal; experimental data feeds AI-driven simulations to optimize device design.

Seed · $6M · 2026-10

Magnetic confinement fusion company spun out of the MIT Plasma Science and Fusion Center (PSFC), building the net-energy demonstration device SPARC and the first commercial fusion power plant ARC based on a high-temperature superconducting (HTS) magnet approach.

Series D+ · $4.0B · 2026-07

Generates fusion energy by passing electric current through plasma

Undisclosed · $130M · 2024-09

AI for controlled fusion R&D: full-stack AI solutions for fusion devices, from diagnostics and prediction to control and design

Angel · $15M · 2026-09

Development of small modular nuclear fusion devices

Series A · $69M · 2026-08

Backed by Fudan University, developing high-field compact fusion power plant technology fueled by deuterium-helium-3, using a tokamak configuration for magnetic confinement fusion

Fusion reactors with stable plasma confinement

Series A · $11M · 2025-03

Compact particle accelerator-based "isotope refinery" producing rare medical and industrial isotopes and tritium for fusion at scale

Seed · $13M · 2026-09

Develops compact fusion reactors using high-temperature superconducting magnets to control and confine superheated plasma

Undisclosed · $125M · 2024-11

Stellarator reactor hardware that sustains fusion reactions with magnetic fields for zero-carbon power generation

Series A · $15M · 2025-07

Developing a compact, scalable fusion energy reactor. Raised US$22 million

Undisclosed · $22M · 2023-09