Sean Mahoney

Principal Investor at ThirtyNine Capital

Southborough, US

vc-firm

About

Sean is President & CEO of ThirtyNine Capital, a Private Equity sponsor based outside of Boston, MA. He is passionate about transforming businesses through the use of emerging software solutions that drive results for clients. He is focusing his firm on leveraging Artificial Intelligence and emerging technology to improve the way people do business. His leadership has brought AndPlus to the forefront in web, mobile and IoT solutions for Fortune 100 businesses and ultimately to sale to KKR-owned Ensono, LP. Sean is an advisor to young entrepreneurs and is an active angel investor in a number of startups throughout New England. Sean lives in central Massachusetts with his wife and two children. He holds both a B.S. in Electrical and Computer Engineering and an M.S. in Information Technology from Worcester Polytechnic Institute and an MBA from the Kellogg School of Management at Northwestern University

Position in the VCSift Database

• 3 investors hold the Principal Investor role in VCSift. Sean Mahoney is one of them.
• 7 investors are based in Southborough, Massachusetts, United States.

Data sourced from 410,343 investor profiles. Updated July 2026.