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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.
| 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 |
