Check credit ratings: Moody's, S&P Global, and Fitch Ratings. They check all participants, for what amount of cache they have. AAA+ rating only possible for s

Check credit ratings: Moody's, S&P Global, and Fitch Ratings. They check all participants, for what amount of cache they have. AAA+ rating only possible for subject, who have 100% coverage of all credits bodies by cache. Unfortunately, from NASDAQ, only Microsoft have AAA+ rating. Other companies have coverage only for year or more of percents, none cover body.