Membrion

Seattle, WA · Founded 2016 · Privately Held (backing)

Developer of ion exchange membrane technology designed for industrial wastewater. Membrion is based in Seattle, WA and was founded in 2016. Its last reported valuation was $27.5 million in Aug 2023. It has raised $46.3 million across 6 recorded rounds; the latest was a $20 million early-stage round in Jun 2025.

Last reported valuation
$27.5M
Oct 2026
Priced at
—
Total raised
$46.3M
Last round
Early Stage VC
Jun 2025
How much has Membrion raised?
$46.3Macross 6 recorded rounds · Aug 2018 – Jun 2025

Most recently, Membrion raised $20.0M in its Early Stage VC (Jun 2025).

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Membrion round by round

6 rounds
Jun 2025Early Stage VC$20.0MSEC filing▮
27 investors participated
Feb 2025Seed Round$1.0MSEC filing▮
19 investors participated
Nov 2024Seed Round$1.9MSEC filing▮
7 investors participated
Dec 2022Early Stage VC$12.5MSEC filing▮
20 investors participated
Sep 2021Seed Round$3.0MSEC filing▮
40 investors participated
Aug 2018Seed Round$1.5MSEC filing▮
30 investors participated

How much has Membrion raised?

Membrion has raised $46.3 million across 6 recorded rounds since 2018. The largest was a $3 million seed round in Sep 2021; the most recent was a $20 million early-stage round in Jun 2025.

Membrion has filed 6 Form Ds with the SEC since 2018, most recently in Jul 2025 ($11.3 million sold to 24 investors).

Membrion investors

39 investors are on record for Membrion, including US National Science Foundation, U.S. Department of Energy, Samsung NEXT Ventures and Third Derivative. By type, the record holds 5 venture capital firms and 2 angel investors. The early-stage round in Jun 2025 drew 27 investors.

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Frequently asked about Membrion

How much has Membrion raised?
Membrion has raised $46.3M in total across 6 recorded funding rounds.
When was Membrion's last funding round?
Membrion's most recent recorded round was Early Stage VC in Jun 2025, raising $20.0M.