Mainspring is developing a new approach to generating clean, resilient, affordable electricity. Their research into high-efficiency methods of converting fuel to electricity led to the development and prototype of their first linear generator. This company was founded by John Connolly and Marshall Micheals in 1996 and is headquartered in Cambridge, MA.

Register for Details

For more details on financing and valuation for Mainspring, register or login.

Please provide a valid email address.

By registering, you agree to Forge’s Terms of Use. Already registered? Log in

Mainspring Funding Rounds and IPO Valuation

Date Funding Round Funding Raised Price per Share IPO Valuation
9/21/2022 Series E and E-1 $305.81MM raised $XXX.XX $XXX.XX
5/4/2021 Series D $108.35MM raised $XXX.XX $XXX.XX
1/24/2018 Series C $84.3MM raised $XXX.XX $XXX.XX
8/29/2017 Series B $40.04MM raised $XXX.XX $XXX.XX
7/1/2011 Series A and A-1 $9.86MM raised $XXX.XX $XXX.XX
Based on primary financings
Powered by Forge Data

Learn more about Mainspring

Forge green plus iconForge green minus icon

What is Mainspring funding to date?

Mainspring has raised $548.36MM to date.
Forge green plus iconForge green minus icon

When was Mainspring founded?

Mainspring was founded in 2010.
Updated on: Jun 12, 2022