Brimstone
PrivateLast Round
Grant
Mar 22, 2024
Est. Valuation
$0
Total Funding Raised
$60.86M
Momentum
Top 10%
of companies Caplight tracks
Company Overview
Brimstone operates in Energy & Sustainability and is based in Oakland, California. Its latest recorded funding round was a Series A round in March 2022.
Brimstone is a construction materials company that has developed an innovative, carbon-negative process for producing ordinary Portland cement and supplementary cementitious materials using carbon-free calcium silicate rock.
Sector
Energy & Sustainability
Verticals
Sustainable Materials, Advanced Materials, Clean Manufacturing, Construction Tech, Carbon Capture
Business Model
B2B
Customer Profile
Hardware Sales
AI Layer
Non-AI
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Brimstone Comparables
Compare Brimstone with similar companies based on industry and business-model similarity.
| Company | Similarity | Market Cap |
|---|---|---|
| Sublime Systems | 94% | |
| Fortera | 88% | |
| Partanna | 86% |
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Brimstone Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Grant | Mar 22, 2024 | ||||
| Series A | Mar 1, 2022 | ||||
| Seed | Nov 16, 2021 | ||||
| Grant | Aug 1, 2021 | ||||
| Grant | Apr 22, 2020 |
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Key People
Founding team and executive leadership
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Brimstone Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| Impact Science | Series A |
| Creative Ventures | Series A |
| Osage University Partners | Grant, Series A |
| Impact Science Ventures | Grant, Series A |
| Breakthrough Energy Ventures | Grant, Seed, Series A |
| Breakthrough Energy Foundation | Seed |
| Collaborative Fund | Grant, Seed, Series A |
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Market signals
Structured signals derived from secondary market and firmographic data.
- Sep 12, 2026
Monthly visitors grew 47% MoM, from 4.7K to 7K.
- Dec 11, 2025
Introduced the 'fourth Great Refinery' Vision, expanding product roadmap to include new metal refining processes.
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Brimstone 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 Brimstone's valuation, stock price, and market status.
Is Brimstone a public or private company?
Brimstone is a private company.
What is the current stock price of Brimstone?
Brimstone is a private company, so its shares have no public market price. Caplight tracks Brimstone's secondary market activity and provides MarketPrice™ estimates of its share price to Caplight users.
How much is Brimstone worth (valuation)?
Brimstone's valuation is estimated at $0 based on funding round data.
Can I buy Brimstone stock?
Brimstone shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors.
When was Brimstone's last funding round?
Brimstone's most recent funding round was Grant on March 22, 2024.
Who are the main investors in Brimstone?
Key investors in Brimstone include Breakthrough Energy Ventures, Breakthrough Energy Foundation, Zouk Capital, Fifth Wall, Breakthrough Energy Discovery.
Will Brimstone IPO soon?
No public IPO plans have been announced for Brimstone.
How can I track Brimstone secondary market activity?
Caplight tracks bids, offers, and trades in Brimstone's shares on secondary markets.