Bain Capital Private Equity has announced it will acquire PartsSource from Great Hill Partners.

PartsSource, based in Aurora, Ohio, is an online marketplace for medical equipment maintenance parts and services. Founded in 2001, the company states that it supports 3,000 member hospitals and more than 15,000 clinical sites.

Bain Capital Private Equity, based in Boston, focuses on making control and minority equity investments and prefers to make more substantial investments from a dollars perspective. Founded in 1984, the firm invests in healthcare and several other industries, targeting companies with revenue of at least $100 million. Within healthcare, Bain Capital Private Equity targets companies in the provider services, hospital/major facilities, life sciences/pharmaceutical and non-reimbursement industries.

Great Hill Partners, based in Boston, seeks to invest in middle market companies in several sectors, including healthcare technology. Founded in 1998, the firm typically invests $25 million to $200 million in equity in each investment, targeting companies with an enterprise value of $25 million to $500 million.

Terms of the transaction were not disclosed, although the Wall Street Journal reported that the deal values the company at about $1.25 billion.