Fluxnium raises $7M to extract uranium from seawater for nuclear fuel

Startup Fluxnium has raised $7 million in seed funding led by Congruent Ventures, with Constellation Technology Ventures and Active Impact Investments participating. The company is developing a specialized fiber deployed on offshore longlines to capture dissolved uranium from seawater, aiming to create a domestic U.S. nuclear fuel source.

• $7M seed round led by Congruent Ventures with Constellation and Active Impact
• Oceans hold an estimated 4.5 billion metric tons of uranium, far more than land deposits
• Fiber was developed with a U.S. national laboratory and deployed on marine longlines
• The U.S. imports more than 90% of its uranium