Promethean Systems reaches £2.2b valuation following £361m investment

A post-money valuation of £2.2b has been reached by Promethean Systems Ltd following an estimated £361m funding round. Based in Twickenham, the company is involved in the manufacture of electronic components and business and domestic software development. The firm also conducts research and experimental development within the fields of natural sciences and engineering.

The business was incorporated in October 2025 and is registered as UK company number 16774853. It maintains an online presence through its website at http://www.promethean-systems.com. LinkedIn data indicates that the organization currently has a headcount of one employee.

The transaction follows an allotment of shares that took place in March. Formal documentation for the capital raise was subsequently filed in August.