Mainspring Capital Partners
Investor Login
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Our Simple Philosophy
When committed teams and great ideas
are aligned
with smart capital and
hands-on experience,

​Big.  Things.  Happen.
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Want to learn more?   ​We'd love to talk.
Contact Us

Growth Capital that Works

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​Flexible
Capital to meet your needs - from Seed to Sale
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​Patient
No artificial timelines driving decisions
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​Experienced
Partners that have founded, built, bought and sold great companies

Who We Are 

We are a Boston-Based Provider of Private Capital to Growing Businesses

Mainspring Capital is built upon decades of entrepreneurial and investing experience.  We know what it takes to build a successful company, because we have been there.  And we also understand that no one understands your business better than you.  

​What we do is fairly simple.
​We provide smart, flexible capital and the hands-on experience to help you achieve your goals.  

     Current Investments

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Contact Us. We'd Love to Hear Your Story.

202 Washington Street
Suite 302
Brookline, MA  02445
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