(Forbes 400, Richest Americans ranking updated for Facebook Founder Zuckerberg charity plants)NEW YORK ( TheStreet) -- The richest Americans are getting richer, according to the latest release of the Forbes ranking of the 400 richest Americans.
(ORCL - Get Report) and Michael Bloomberg have made the Buffett/Gates charitable pledge. Ellison is No. 3 on the Forbes 400, with an estimated wealth of $27 billion. Bloomberg rounded out the Forbes 400 Top 10 with an estimated wealth of $18 billion. There are two notable families represented in the Forbes 400 Top Ten that aren't part of the Buffett/Gates group, though they are big charitable donors. The Walton heirs of Wal-Mart (WMT - Get Report) fame claimed four of the Top 10 spots on the Forbes 400, with a combined wealth of $84 billion. The Koch brothers, Charles and David, of privately held Koch Industries, have a combined wealth of $43 billion and tied for fifth on the Forbes 400. The most notable of the moves up among the richest was Facebook founder Mark Zuckerberg, whose wealth increased by 245%, the largest of any of the 400 Richest Americans. Zuckerberg was 35th on the list with a wealth estimated at $6.9 billion, with the social media mogul finishing ahead of old media mogul Rupert Murdoch of News Corp. (NWSA - Get Report), who was at No. 38 with an estimated wealth of $6.2 billion.