I know nothing about them just found them, while wandering around the net.
This from e-mail;
The downgrade of Bristol Myers Squibb to Aaa by Moody s leaves only 8 AAA-rated companies left. They are GE, UPS, AIG, ExxonMobil, Johnson & Johnson Berkshire Hathaway, and Pfizer & Merck. In 1990 there were 27 AAA companies and in 1979 there were 58.