Mainspring
PrivateLast Round
Series F
Apr 14, 2025
Total Funding Raised
$773M
Company Overview
Mainspring Energy is a cleantech company that manufactures and delivers an innovative, fuel-flexible on-site power generator designed to accelerate the transition to a zero-carbon electric grid.
Sector
Energy & Sustainability
Verticals
Smart Grid, Energy Management, Energy Storage, Alternative Fuels
Business Model
B2B
Customer Profile
Hardware Sales, Hardware + Subscription, Government Contracts, Services & Consulting
AI Layer
Application
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Mainspring Comparables
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Request accessMainspring Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series F | Apr 14, 2025 | ||||
| Series E | Sep 21, 2022 | ||||
| Series D | May 4, 2021 | ||||
| Series C | Jan 24, 2018 | ||||
| Series B | Aug 17, 2012 |
Mainspring Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| CPP Investments | Series E |
| Pictet Group | Series F |
| 40 North Ventures | Series D |
| Fine Structure Ventures | Series E |
| Temasek | Series F |
| Khosla Ventures | Series F, Series C, Series E, Series D, Series A, Series B |
| Princeville Capital | Series E, Series D |
Market signals
Structured signals derived from secondary market and firmographic data.
- Apr 14, 2025
$258M round with Khosla Ventures and LGT Private Banking.
- Sep 21, 2022
$290M round led by Lightrock.
Mainspring Filings
Explore SEC and related filing metadata, where available.
| Type | Date | Amount Offered | Amount Sold | Filing | Pages | Download |
|---|
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Request accessFrequently Asked Questions
Common questions about Mainspring's valuation, stock price, and market status.
Is Mainspring a public or private company?
Mainspring is a private company.
What is the current stock price of Mainspring?
Mainspring is a private company with no public stock price. No recent secondary market data is available.
How much is Mainspring worth (valuation)?
Valuation information for Mainspring is not publicly available.
Can I buy Mainspring stock?
Mainspring shares may be available on secondary markets subject to transfer restrictions. Caplight facilitates secondary market transactions for accredited investors. Visit https://www.caplight.com to learn more.
When was Mainspring's last funding round?
Funding round information for Mainspring is not publicly available.
Who are the main investors in Mainspring?
Investor information for Mainspring is not publicly disclosed.
Will Mainspring IPO soon?
No public IPO plans have been announced for Mainspring.
How can I track Mainspring secondary market activity?
Caplight tracks bids, offers, and trades for private companies. Visit https://www.caplight.com to monitor Mainspring's secondary market activity and sign up for updates.