Mainspring Stock

Develops and manufactures Linear Generators to unlock the full potential of distributed power generation.

Price Per Share $5.20 -19.81%
Updated Jun 25, 2026

Mainspring Share Price

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6 Months 12 Months 24 Months

Highest Bid

$ 260.80

Lowest Offer

$ 188.50

Last Trade

$ 234.00

Live Orders

1,298

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Overview

Mainspring Energy is a technology company focused on providing clean and reliable power solutions through its innovative Mainspring Linear Generator. Founded with the vision of supporting a net-zero carbon grid, Mainspring aims to deliver local power generation that can adapt to various fuel types and operational needs.

Founded

2010

Headquarters

Menlo Park, CA

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Mainspring Management Team

Mainspring people and management

  • Board Member, Co-Founder, CEO, Board Member
    Shannon Miller
  • COO
    David DeGraaff
  • Board Member
    Samir Kaul
  • Board Member
    Eric Kosmowski
  • Board Member
    Shyam Kamadolli
  • Co-Founder, Board Member
    Adam Simpson
  • Co-Founder, CTO
    Matt Svrcek
  • Board Member
    Alexander Weiss
  • Board Member
    Jagdeep Singh
  • Board Member
    Nael Kassar
  • CFO
    Ryan Fletcher
  • Board Member
    Kevin Bone
  • Board Member
    Tom Linebarger

Investors

Major Mainspring investors

  • ClearSky Ventures

  • 40 North Management

  • Statoil Energy Ventures

  • KCK Group

  • Devonshire Investments

  • Canada Pension Plan Investment Board (CPPIB)

  • Lineage Logistics

  • Centrica Innovations

  • Lightrock

  • American Electric Power (AEP)

  • Khosla Ventures

  • Fine Structure Venture

  • Princeville Global

  • Shell Ventures

  • Hanwha Venture Capital Corporation

Mainspring Valuations & Financials

Gain Insights Into Mainspring Stock Valuation & Share Prices

View real-time NPM data on Mainspring stock including daily Mainspring stock price estimates, valuation history, and historical share price information. Access Mainspring financing rounds, secondary trade levels, cap table data, and private company comparable transactions. Use NPM's private company valuation database to track Mainspring pricing across six independent market signals. Looking for private company due diligence data sources on Mainspring? Get in touch to learn more.

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FAQ

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Buy Mainspring Stock

Mainspring stock does not trade on public stock exchanges. Mainspring stock is considered a private security and you need to be an accredited investor to trade shares. To invest in Mainspring stock you can either buy shares directly through the company or work with a secondary trading marketplace like Nasdaq Private Market.

Learn more about the secondary market for private company shares on the investors page.

Sell Mainspring Stock

Mainspring Stock does not trade on public stock exchanges. In order to sell Mainspring shares you need to work directly with the company or with a secondary trading marketplace like Nasdaq Private Market. NPM has more than a decade of experience helping sell shares on the private market to our network of institutional investors.

Learn more about NPM services for selling privately held stock on the Employee Shareholders page.

Read more about how to sell private company stock on the private secondary market:

 

Mainspring Stock Price

Mainspring does not have a publicly available stock price because it is privately held and not traded on public stock exchanges. Through the NPM Data and Intelligence database from Nasdaq Private Market, you can view Mainspring share price and other valuable private market data.

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Mainspring Stock Ticker Symbol

There is no ticker symbol for Mainspring stock because it is a private company. Private companies do not have ticker symbols like public companies, they are identified primarily by using the company ‘street’ name or legal name.

Criteria to Sell Mainspring Stock

Nasdaq Private Market currently works with employees, ex-employees, and other company investors. In order to sell Mainspring stock you need to receive the company’s approval, which Nasdaq Private Market manages on your behalf.

Learn more about selling privately held stock on the Employee Shareholders page.

Read more about how to sell shares of a private company and eligibility for selling privately held stock:

 

Criteria to Buy or Invest in Mainspring Stock

Currently, Nasdaq Private Market only works with accredited entities and institutional investors to purchase private company stock. In order to invest in Mainspring stock, you need to be an accredited entity or institutional investor.

Learn more about the Nasdaq Private Market tool kit for investors on the Investor Trading page.

Mainspring Stock Settlement

Once you buy or sell, stock share ownership must transfer before funds are wired. With Nasdaq Private Market, clients leverage our patent-pending Transfer and Settlement technology which streamlines and manages transfer activity from match to settlement.

To learn more about private company stock Transfer and Settlement, check out the Transfer and Settlement page.

Mainspring IPO

Mainspring is a private company and has not had an IPO. There is currently no Mainspring IPO price. Get started to begin exploring the Nasdaq Private Market Data and Intelligence database and gain access to actionable data related to Mainspring IPO.

Learn more about Data and Intelligence private company stock data for institutional investors on the on the NPM Data and Intelligence Product Page.