Update: Factorial Energy Shares Rise After Signing Battery Industrialization Deal With Mitsui Kinzoku

03:01 PM EDT, 09/17/2026 (MT Newswires) -- (Updates with the latest stock price movement in the headline and the first paragraph.) Factorial Energy (FAC) shares rose more than 13% in Thursday trading after the company said it has entered a joint development agreement with Mitsui Kinzoku to support the industrialization and scale-up of its all-solid-state Solstice battery platform. Factorial Energy said it will be responsible for cell design, process development, supply chain qualification, line integration and manufacturing validation. Factorial's Solstice platform uses sulfide-based solid electrolytes and dry cathode processing, it said. Price: 5.66, Change: +0.66, Percent Change: +13.10