The round was led by 1517 Fund and Anglo American, with participation from Ã'bermorgen Ventures, Shared Future Fund, Malcolm Handley and other leading investors. Alongside a CREATE award from the Department of Energy's ARPA-E, these investments bring Marathon Fusion's total funding to $6.9M.

Marathon Fusion began operations in 2023 to develop high-efficiency fuel systems to accelerate the deployment and improve the economics of fusion power plants. Marathon's technology is designed to enable the rapid, continuous, and high-throughput recycling of fusion fuel.