alliance boots angel capital angel investor calpers capital structure carried interest divisional buyout dollar general early history of private equity energy future holdings corporation equity co-investment financial endowment financial sponsor fund of funds general partner growth capital hedge fund high-yield debt high net worth individual history of private equity and venture capital hospital corporation of america institutional investor kohlberg kravis roberts leveraged buyout limited liability company limited partnership list of private equity firms management buyout management fee mergers and acquisitions mezzanine capital nxp semiconductors nielsen company pension fund post-money valuation pre-money valuation private equity private equity firm private equity secondary market publicly traded private equity seed money sovereign wealth fund startup company venture capital venture capital financing venture debt venture round