United States · 
Who invested in Mainspring Energy?
Mainspring Energy's investors include General Catalyst, Alumni Ventures, Khosla Ventures, DCVC and Temasek Holdings, and 1 more on record. General Catalyst led its latest round.
United States · Growth startup
Who invested in Mainspring Energy
One round we have observed, with the 6 investors named in it. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
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Funding summaryUpdated 27 Oct 2026
$258Mraised across 1 round since 2025, from 2 sources
- Latest round
- Growth, $258MApr 2025
- Led by
- General Catalyst
- Investors
- 6 (1 led)
The rounds
- Apr 2025Growth$258M
Reported by Crunchbase News and 1 other
Founders and team
From the SEC filings it signed: 2 on the team.
- Adam SimpsonExecutive Officer, Directori
- Shannon MillerExecutive Officer, Directori
On the board, as filediAlexander WeissEric KosmowskiJagdeep SinghNael KassarSamir KaulShyam Kamadolli
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 3 firms list Mainspring Energy as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Quick answers about Mainspring Energy
How much has Mainspring Energy raised?
Mainspring Energy has raised $258M across 1 round since 2025.
When did Mainspring Energy last raise?
Mainspring Energy's most recent round was a Growth of $258M in Apr 2025, led by General Catalyst.
What was Mainspring Energy's biggest round?
Its most recent round, $258M in Apr 2025, is also its largest on record.
Who backed Mainspring Energy first?
Mainspring Energy's first round on record, in Apr 2025, was backed by General Catalyst, Alumni Ventures and Khosla Ventures and 3 others.
What stage is Mainspring Energy at?
Mainspring Energy's latest named round is a Growth, in Apr 2025.
Where is Mainspring Energy based?
Mainspring Energy is based in the United States.
Who led Mainspring Energy's rounds?
General Catalyst led the Growth in 2025.
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In the same sector, and raised in the last eighteen months.
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