Key facts
- Membrion’s last known valuation is $27.5M (Aug 2023).
- It has raised $46.3M across 6 recorded rounds; the latest was Early Stage VC ($20.0M) in Jun 2025.
- Notable investors include US National Science Foundation, U.S. Department of Energy, Samsung NEXT Ventures, Third Derivative, Sand Hill Angels — 39 tracked in total.
- Membrion has filed 6 Form Ds with the SEC since 2018, most recently Jul 2025 ($11.3M sold to 24 investors).
- Status: Privately Held (backing).
- ·Post-money valuations for all 6 rounds
- ·The complete investor list — 39 names
- ·Watchlist + deal alerts for Membrion
Funding rounds
6 roundsAbout Membrion
Developer of ion exchange membrane technology designed for industrial wastewater. The company's technology filters molecules under any conditions, including hot, cold, acidic, caustic, vacuum, and biologically sensitive environments, made from silica gel, enabling businesses to access membranes with a longer lifetime and lower cost.
- Sector
- Business Products and Services (B2B)
- HQ
- Seattle, WA, United States
- Founded
- 2016
- Employees
- 32
- Website
- membrion.com/
- Ownership
- Privately Held (backing)
Membrion doesn't have a composite mark yet — a PA Mark is published once enough pricing inputs exist (trade prints, fund marks, round prices). The rest of the record below builds toward it.
Recorded secondary trades
No secondary trades in Membrion shares have been recorded yet. When a print lands — third-party, direct report, or platform — it appears here with structure, source, and price.
Institutional fund marks
No SEC-registered fund has reported a fair-value mark on Membrion in its N-PORT filings yet. We sweep new filings monthly.