Other Types of Funds Since venture firms are private firms, there is typically no way to exit before the partnership totally matures or expires. In recent years, a new form of venture firm has evolved: so-called "secondary" partnerships that specialize in purchasing the portfolios of investee company investments of an existing venture firm. This type of partnership provides some liquidity for the original investors. These secondary partnerships, expecting a large return, invest in what they consider to be undervalued companies.