Summa Equity: Building Purpose-Driven Organizations. George Serafeim, November 2017, Case, “In 2015, Reynir Indahl left top Nordic private equity firm Altor Equity Partners to found Summa Equity (Summa). After long contemplation following the financial crisis, Indahl was convinced the financial system was producing negative externalities and that the current private equity model adopted by most firms would no longer be successful. Summa was developed under a new private equity model that sought to “future-proof” businesses by focusing on long term value creation and growth, in addition to traditional private equity practices of implementing best practices and productivity improvements.Link