Mainspring

Menlo Park, CA · Founded 2010 · Privately Held (backing)

Manufacturer of linear power generators intended to bring affordable, reliable, and net-zero carbon grids of the future. Mainspring is based in Menlo Park, CA and was founded in 2010. Its last reported valuation was $1.9 billion in Apr 2025. It has raised $849 million.

Last reported valuation
$1.9B
Oct 2026
Priced at
—
Total raised
$849.5M
Last round
—

Who backs Mainspring?

37 investors
InvestorType
Alumni VenturesVenture capital
General CatalystVenture capital
Khosla VenturesVenture capital
U.S. Department of EnergyOther
F-Prime CapitalVenture capital
Temasek HoldingsOther
DCVCVenture capital
LightrockVenture capital
Chevron Technology VenturesOther
CPP InvestmentsOther
+ 27 more investors · a free account shows the complete list
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Mainspring investors

37 investors are on record for Mainspring, including Alumni Ventures, General Catalyst, Khosla Ventures and U.S. Department of Energy. By type, the record holds 7 venture capital firms and 4 family offices.

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