Our Simple Philosophy

When committed teams and great ideas
are aligned
with smart capital and hands-on experience,

​Big.  Things.  Happen.

Want to learn more?   ​We'd love to talk.

Contact Us

Growth Capital that Works

​Flexible
Capital to meet your needs - from Seed to Sale

​Patient
No artificial timelines driving decisions

​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 you're the expert in your business.  

​What we do is fairly simple - whether you are an early stage venture looking for growth capital or a founder looking to exit, we can provide smart, flexible capital and the hands-on experience to help you achieve your goals.  

Current Investments

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

202 Washington Street
Suite 302
Brookline, MA  02445