Funding round
Mainspring Energy Series F
Mainspring Energy, which works in linear generator manufacturing in Menlo Park, raised $258M in a Series F round announced on 14 Apr 2025, led by General Catalyst. 11 firms took part. It is Mainspring Energy's fourth venture round on record; the one before was a Series E in May 2022.
$258M
Amount raised
Not disclosed
Post-money valuation
11
Investors
1 lead
Valuation
What this round says about the price
Mainspring Energy did not disclose a valuation in this round; its last disclosed one was $440M at the Series D (May 2021). It came 35 months after Mainspring Energy's Series E. It is 44% of the $586M Mainspring Energy has raised in the venture rounds on record. No later venture round is on record for Mainspring Energy.
Mainspring Energy's funding rounds
Mainspring Energy has 4 venture rounds on record and 1 other deal. This one is highlighted.
Investors
Who put money in
General Catalyst led the round with 10 other firms.
Lead investor
- General Catalyst backs 574 venture-backed companies new investor
Also in the round
- Amazon's Climate Pledge Fund new investor
- DCVC backs 171 venture-backed companies new investor
- Temasek backs 195 venture-backed companies new investor
- Marunouchi Innovation Partners new investor
- M&G Investments new investor
- Pictet Group new investor
- Lightrock backs 62 venture-backed companies new investor
- LGT Bank new investor
- Khosla Ventures backs 396 venture-backed companies new investor
- Gates Frontier new investor
Joined the board: Tom Linebarger (General Catalyst) and Bethany Mayer (Ixia).
Use of proceeds
What the money is for
According to the announcement, the money goes to sales and marketing and scaling operations.
- Sales and marketing
- Scaling operations
Comparable rounds
How it compares
The closest in time: Series F rounds in any sector within 6 months:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Shield AI Aerospace and Defence | 15 Apr 2025 | $240M | $5.30B | not named |
| Altruist Investment Consultants & Financial Advisors | 22 Apr 2025 | $152M | $1.90B | GIC |
| Job&Talent Tech Companies | 10 Apr 2025 | $103M | $1.50B | not named |
| Airwallex Payment Processing & Point of Sale | 21 May 2025 | $300M | $6.20B | Square Peg |
| Trucking and Logistics | 8 May 2025 | $200M | $1.20B | Kedaara Capital and Wellington Management |
| Quantexa Tech Companies | 5 Mar 2025 | $175M | $2.60B | Ontario Teachers’ Pension Plan |
| Medical Supply Manufacturers | 12 Mar 2025 | $65M | not disclosed | US Venture Partners |
| Applied Intuition Tech Companies | 17 Jun 2025 | $600M | $15.00B | BlackRock and Kleiner Perkins |
Sources
Where this comes from
Reported by 4 sources.
Questions
Frequently asked
How much did Mainspring Energy raise in its Series F round?
Mainspring Energy raised $258M in its Series F round, announced in Apr 2025.
Who led Mainspring Energy's Series F round?
General Catalyst led it, with Amazon's Climate Pledge Fund, DCVC, Temasek, Marunouchi Innovation Partners and M&G Investments and 5 more.
What was Mainspring Energy's valuation at the Series F round?
It was not disclosed; its last disclosed one was $440M at the Series D (May 2021).