It's mostly the usual suspects on the latest Forbes 400 list of the wealthiest Americans: Bill Gates tops the list for the 20th consecutive year, with a net worth of $72 billion, followed by investor Warren Buffett and Oracle CEO Larry Ellison.
The Koch brothers, Charles and David, tie for fourth place, while Walton family members with an interest in retail behemoth Wal-Mart occupy positions 6 through 9.
Billionaire investment legend Warren Buffett's Berkshire Hathaway Inc. has had its credit rating lowered from AA+ to AA by Standard & Poor's Ratings Services.
In a statement, S&P says that even though Berkshire Hathaway has an "excellent business profile," the lower credit rating "better reflects our view of BRK's dependence on its core insurance operations for most of its dividend income." (S&P's statement is posted on its website, but you have to register to view it.)