angel capital angel investor business capital structure carried interest divisional buyout early history of private equity entrepreneur equity co-investment finance financial endowment financial sponsor fund of funds growth capital high-yield debt high net worth individual history of private equity and venture capital institutional investor investment leveraged buyout limited liability company limited partnership management buyout mergers and acquisitions mezzanine capital pension fund post-money valuation private equity private equity firm private equity fund private equity secondary market publicly traded private equity seed money sovereign wealth fund startup company stock venture capital venture capital financing venture debt venture round