Mainspring Energy
PrivateLast Round
Series F
4/14/2025
Total Funding Raised
$734.7M
Company Overview
Mainspring (Alternative Energy Equipment) is a clean energy company that manufactures linear power generators designed to provide affordable, reliable, and net-zero carbon electricity by utilizing a low-temperature reaction of air and fuel to efficiently generate power.
Sector
Energy & Sustainability
Verticals
Energy Management, Alternative Fuels, Smart Grid, Renewable Energy, EV Charging
Business Model
B2B
Customer Profile
Hardware + Subscription, Usage-Based SaaS, Hardware Sales
AI Layer
Non-AI
Keywords
Historical Pricing
Historical view of private secondary pricing and transaction trends.
Mainspring Energy Comps
Public and private peers based on sector, stage, and business model.
Mainspring Energy Funding Rounds
Historical fundraising activity
| Round | Date | Amount Raised | Valuation | Investors | Sources |
|---|---|---|---|---|---|
| Series F | 4/14/2025 | ||||
| Grant | 10/23/2024 | ||||
| Series E | 9/21/2022 | ||||
| Series D | 5/4/2021 | ||||
| Series C | 1/24/2018 |
Mainspring Energy Investors
Notable investors and investment history
| Investor | Rounds |
|---|---|
| CPP Investments | Series E |
| Pictet Group | Series F |
| 40 North Ventures | Series D |
| ClearSky | Series D |
| Fine Structure Ventures | Series E |
| Temasek | Series F |
| Khosla Ventures | Series F, Series D, Series E, Series C |
Market signals
Structured signals derived from secondary market and firmographic data.
- Apr 14, 2025
$258M round completed.
- Oct 23, 2024
Secured $8.679M in grant funding.
Mainspring Energy Filings
SEC and related filings with document metadata.
| Typed | Date | Amount Offered | Amount Sold | Filling | Pages | Download |
|---|---|---|---|---|---|---|
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Frequently Asked Questions
Common questions about Mainspring Energy's valuation, stock price, and market status.
