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Captura

Carbon removal that pulls CO2 from seawater

Raised to date

$53.5M

of $60.9M offered across 1 Form D filing

Still open
$7.4M
Investors
45
Last filed
Jul 2, 2026

About

Captura Corp. is a Pasadena, California climate-technology company commercializing Direct Ocean Capture, a process that removes CO2 directly from seawater so the ocean absorbs more CO2 from the atmosphere. The technology was invented at Caltech by professors Chengxiang Xiang and Harry Atwater and is built on a proprietary bipolar membrane electrodialysis platform that uses only seawater and renewable electricity, with no chemical additives or by-products. Captura manufactures its electrodialysis stacks in Pasadena and operates a 1,000 tonne-per-year pilot plant in Hawaii. It sells durable carbon-removal credits and has been backed by Aramco, Equinor Ventures, Hitachi, Frontier, the U.S. Department of Energy, and an XPRIZE Carbon Removal award.

Removes CO2 from seawater rather than air, which is roughly 150x more concentrated in the ocean, using an additive-free bipolar membrane electrodialysis platform that also serves lithium extraction, desalination, and energy-storage applications.

Funding

  • EquityFiled Jul 2, 2026Form D
    $53.5M/ $60.9M

Product

Direct Ocean Capture

Carbon removal system

An ocean-based carbon dioxide removal system that pumps seawater through a bipolar membrane electrodialysis unit, strips out dissolved CO2 for permanent storage or reuse, and returns decarbonized seawater to the ocean where it reabsorbs atmospheric CO2.

  • Bipolar membrane electrodialysis with no chemical additives
  • Only outputs are captured CO2 and decarbonized seawater
  • 1,000 tonne-per-year pilot plant operating in Hawaii

Built for

Corporate carbon-credit buyers and energy, industrial, and government partners funding durable carbon dioxide removal, plus industrial operators in lithium extraction, desalination, and sustainable fuels

People on file