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.
Funding Date | Share Class | Amount Raised | Price per Share | Post-Money Valuation | Key Investors | |
---|---|---|---|---|---|---|
11/26/2024 | Series F-1 | $41.14MM | $xx.xx | $1.51B | Undisclosed Investors | |
Price per Share
$xx.xx
Shares Outstanding
13,821,080
Liquidation Pref Order
1
Liquidation Pref As Multiplier
1.0x
Conversion Ratio
1.0x
Dividend Rate
8.0%
Cumulative
Non-cumulative
Participating
Non-participating
Participation Cap
--
Key Investors
Undisclosed Investors
|
||||||
11/26/2024 | Series F | $159.55MM | $xx.xx | $1.51B | Undisclosed Investors | |
Price per Share
$xx.xx
Shares Outstanding
42,882,709
Liquidation Pref Order
1
Liquidation Pref As Multiplier
1.0x
Conversion Ratio
1.0x
Dividend Rate
8.0%
Cumulative
Non-cumulative
Participating
Non-participating
Participation Cap
--
Key Investors
Undisclosed Investors
|
||||||
09/21/2022 | Series E-1 | $18.91MM | $xx.xx | $1.04B | Bill Gates, Cpp Investments, Fidelity, Fine Structure Ventures, Hanwha Power Systems, Khosla Ventures, Lightrock, Lineage Ventures, Princeville Capital, Shell Ventures | |
Price per Share
$xx.xx
Shares Outstanding
2,467,100
Liquidation Pref Order
2
Liquidation Pref As Multiplier
1.0x
Conversion Ratio
1.0x
Dividend Rate
8.0%
Cumulative
Non-cumulative
Participating
Non-participating
Participation Cap
--
Key Investors
Bill Gates, Cpp Investments, Fidelity, Fine Structure Ventures, Hanwha Power Systems, Khosla Ventures, Lightrock, Lineage Ventures, Princeville Capital, Shell Ventures
|
||||||
09/21/2022 | Series E | $284.47MM | $xx.xx | $1.04B | Bill Gates, Cpp Investments, Fidelity, Fine Structure Ventures, Hanwha Power Systems, Khosla Ventures, Lightrock, Lineage Ventures, Princeville Capital, Shell Ventures | |
Price per Share
$xx.xx
Shares Outstanding
35,251,855
Liquidation Pref Order
2
Liquidation Pref As Multiplier
1.0x
Conversion Ratio
1.0x
Dividend Rate
8.0%
Cumulative
Non-cumulative
Participating
Non-participating
Participation Cap
--
Key Investors
Bill Gates, Cpp Investments, Fidelity, Fine Structure Ventures, Hanwha Power Systems, Khosla Ventures, Lightrock, Lineage Ventures, Princeville Capital, Shell Ventures
|
||||||
05/04/2021 | Series D | $108.35MM | $xx.xx | $440.31MM | 40 North Ventures, Aep, Bill Gates, Chevron Technology Ventures, Clearsky, Devonshire Investors, Equinor, Kck, Khosla Ventures, Princeville Capital | |
Price per Share
$xx.xx
Shares Outstanding
20,055,578
Liquidation Pref Order
3
Liquidation Pref As Multiplier
1.0x
Conversion Ratio
1.0x
Dividend Rate
8.0%
Cumulative
Non-cumulative
Participating
Non-participating
Participation Cap
--
Key Investors
40 North Ventures, Aep, Bill Gates, Chevron Technology Ventures, Clearsky, Devonshire Investors, Equinor, Kck, Khosla Ventures, Princeville Capital
|
||||||
01/24/2018 | Series C | $84.3MM | $xx.xx | $245.46MM | American Electric Power, Bill Gates, Centrica Innovations, Kck Group, Khosla Ventures, Louis M. Bacon, Statoil Energy Ventures | |
Price per Share
$xx.xx
Shares Outstanding
19,546,914
Liquidation Pref Order
4
Liquidation Pref As Multiplier
1.0x
Conversion Ratio
1.0x
Dividend Rate
8.0%
Cumulative
Non-cumulative
Participating
Non-participating
Participation Cap
--
Key Investors
American Electric Power, Bill Gates, Centrica Innovations, Kck Group, Khosla Ventures, Louis M. Bacon, Statoil Energy Ventures
|
||||||
08/29/2017 | Series B | $40.04MM | $xx.xx | $110.16MM | Undisclosed Investors | |
Price per Share
$xx.xx
Shares Outstanding
10,569,940
Liquidation Pref Order
5
Liquidation Pref As Multiplier
1.0x
Conversion Ratio
1.0x
Dividend Rate
8.0%
Cumulative
Non-cumulative
Participating
Non-participating
Participation Cap
--
Key Investors
Undisclosed Investors
|
||||||
07/01/2011 | Series A | $2.86MM | $xx.xx | $25.97MM | Undisclosed Investors | |
Price per Share
$xx.xx
Shares Outstanding
3,169,952
Liquidation Pref Order
5
Liquidation Pref As Multiplier
1.0x
Conversion Ratio
1.0x
Dividend Rate
8.0%
Cumulative
Non-cumulative
Participating
Non-participating
Participation Cap
--
Key Investors
Undisclosed Investors
|
||||||
07/01/2011 | Series A-1 | $7MM | $xx.xx | $25.97MM | Undisclosed Investors | |
Price per Share
$xx.xx
Shares Outstanding
3,708,413
Liquidation Pref Order
5
Liquidation Pref As Multiplier
1.0x
Conversion Ratio
1.0x
Dividend Rate
8.0%
Cumulative
Non-cumulative
Participating
Non-participating
Participation Cap
--
Key Investors
Undisclosed Investors
|