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Fluxnium raised $7M in seed funding led by Congruent Ventures to develop uranium extraction from seawater technology.

PRIVATESep 16, 2026•about 4 hours ago

Amount Raised

$7 Million

Round Type

Seed

Biotechnology

Investors

Constellation EnergyActive Impact InvestmentsCongruent Ventures

Description

Fluxnium, a clean technology startup, has secured $7 million in seed funding led by Congruent Ventures, with participation from Active Impact Investments and Constellation Energy. The company is developing a method to extract uranium from seawater using specially designed polymer fibers suspended from offshore buoys. The technology is based on chemistry licensed from U.S. Department of Energy national laboratories

Company Information

Company

Fluxnium

About

Fluxnium is a clean technology startup developing a method to extract uranium from seawater using specially designed polymer fibers. The fibers are suspended from offshore buoys and can be reused multiple times without producing toxic mining tailings. The technology is based on chemistry licensed from U.S. Department of Energy national laboratories. The company aims to address uranium supply concerns and geopolitical dependence as the nuclear industry expands.

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