THL is a Boston-based private equity firm investing in middle-market growth companies in three industry groups: Financial Ser ... vices, Healthcare, and Technology & Business Solutions. We partner with management teams to build great companies of lasting value and strive to generate superior returns for our investors. We couple our deep domain expertise with dedicated internal operating resources to transform and build great companies of lasting value in partnership with management. Since 1974, we have raised more than $34 billion of equity capital, invested in over 160 companies and completed more than 500 add-on acquisitions representing an aggregate enterprise value at acquisition of over $210 billion. read more