Membrion
PrivateLast Round
Series B
Extension
Oct 7, 2025
Total Funding Raised
$42.57M
Momentum
Top 25%
of companies Caplight tracks
Company Overview
Membrion operates in Energy & Sustainability and is based in Seattle, Washington. Its latest recorded funding round was a Series B Extension round in October 2025.
Membrion is an environmental services company that develops and manufactures ceramic desalination membrane technology designed for industrial wastewater treatment.
Sector
Energy & Sustainability
Verticals
Water Treatment, Clean Manufacturing, Advanced Materials, Circular Economy
Business Model
B2B
Customer Profile
Usage-Based SaaS, Services & Consulting
AI Layer
Non-AI
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Membrion Comparables
Compare Membrion with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| ZwitterCo | 81% | |
| Axine Water Technologies | 78% | |
| ElectraMet | 75% |
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Membrion Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series B Extension | Oct 7, 2025 | ||||
| Accelerator | Mar 12, 2024 | ||||
| Series B | Aug 8, 2023 | ||||
| Grant | Sep 8, 2022 | ||||
| Grant | Sep 20, 2021 | ||||
Series A | Mar 13, 2020 |
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Key People
Founding team and executive leadership
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Membrion Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Sierra Angels | Seed |
| WRF Capital | Series A |
| E8 Angels | Seed |
| Indico Capital Partners | Series B, Series B Extension |
| E8 | Seed |
| Lam Capital | Series B |
| PureTerra Ventures | Series B, Series B Extension |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Aug 21, 2026
Monthly visitors increased 411% MoM, reaching 7K.
- Oct 7, 2025
$20M raised in Series B Extension round.
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Recent news
Latest coverage and updates
- hiresOct 27, 2026
Membrion, Inc. hires Alexander Demihovsky as director of applications engineering; he joins the Seattle-based company from Xylem.
- promotesAug 14, 2026
Membrion, Inc. promotes Emily Rabe to vice president of technology in Washington after she spends six years leading its intellectual property efforts and strategic technology programs while working with external technology partners.
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Membrion Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
Filing documents are not displayed on this public page. Request access to learn about available coverage.
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Frequently Asked Questions
Common questions about Membrion's valuation, stock price, and market status.
Is Membrion a public or private company?
Membrion is a private company.
What is the current stock price of Membrion?
Membrion is a private company, so its shares have no public market price. Caplight tracks Membrion's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Membrion worth (valuation)?
Valuation information for Membrion is not publicly available.
Can I buy Membrion stock?
Membrion shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Membrion's last funding round?
Membrion's most recent funding round was Series B Extension on October 7, 2025.
Who are the main investors in Membrion?
Key investors in Membrion include Lam Capital, PureTerra Ventures, Samsung Venture Investment, Bellingham Angel Investors, Pangaea Ventures.
Will Membrion IPO soon?
No public IPO plans have been announced for Membrion.
How can I track Membrion secondary market activity?
Caplight tracks bids, offers, and trades in Membrion's shares on secondary markets.