Off the top of my head: Baupost Group (Seth Klarman), Greenlight (David Einhorn), Gotham (Howard Marks), Renaissance (Jim Simons), Oaktree (Joel Greenblatt), Gr

Off the top of my head: Baupost Group (Seth Klarman), Greenlight (David Einhorn), Gotham (Howard Marks), Renaissance (Jim Simons), Oaktree (Joel Greenblatt), Graham & Newman (Benjamin Graham), Magellan (Peter Lynch), Pabrai (Mohnish Pabrai), ... Most of these are closed and closely held. Keeping your capital base small with long-term-minded investors (e.g., "family" money) is a huge leg up.