Private equity funds are usually limited liability partnerships (LLPs), which gives them special privileges of nondisclosure; most are organized in the State of Delaware. PEF's have sponsors, or "principals," who are responsible for organizing the fund and recruiting other investors.
Among the best-known PE funds are Blackstone Group*, Kohlberg Kravis Roberts (KKR)*, Goldman Sachs Capital Partners*, Carlyle Group, Permira, Apollo Management, Providence Equity, TPG Capital, Warburg Pincus, and Cerberus. Companies marked with an asterisk (*) are publically listed corporations; most PE funds are pivately managed. The selection above includes the largest ones by capital under management.
In the USA, PE funds have long been sinecures for the most powerful political dynasties: the Rockefellers, the Romneys, the Bushes, and others.