Adden Energy is a Harvard spinout building dynamically-stable, self-healing solid-state lithium-metal batteries designed to make electric vehicles charge in minutes, last a million miles, and never catch fire. Headquartered in Waltham, Massachusetts, the company is scaling its lab breakthrough into commercial pouch cells on a roll-to-roll pilot line and shipping samples to automakers for validation.
Axoft is a Cambridge, Massachusetts neurotechnology company building implantable brain-computer interfaces (iBCIs) out of Fleuron, a proprietary material it claims is up to 10,000x softer than the polyimide used in conventional brain implants. By making electronics roughly as soft as brain tissue, Axoft aims to keep thousands of sensors in stable contact with single neurons for years instead of months - reducing scarring and signal loss - to diagnose and eventually treat disorders of consciousness, paralysis, and other neurological conditions. A Harvard spinout founded in 2021, it raised an oversubscribed $55M Series A in April 2026 and has run first-in-human studies in 11+ patients worldwide.
Metalenz is a Boston-based deep-tech company that replaces stacks of curved glass lenses with a single flat, nanostructured semiconductor chip called a metasurface. Spun out of Harvard's Capasso Lab, it is the first company to mass-produce meta-optics, shrinking cameras and sensors for smartphones, biometrics, and 3D sensing. Its flagship Polar ID brings polarization-based, payment-grade face authentication to devices at a fraction of the size and cost of existing systems.