Those who were hoping only government and government-related entities are about to be skewered by S&P, we have some unpleasant news: according to Reuters Insider: "Announcements should be expected this morning about effects to corporations from S&P’s downgrade of U.S. credit rating, David Beers, head of S&P’s sovereign ratings." This means financials, the corporate group most at risk to the US downgrade, are about to be shellacked. And, as we pointed out previously, a 2 notch downgrade in Morgan Stanley will result in a $1.4 billion margin call. We haven't done the math on the other TBTFs but something tells us Bank of America is in the same boat (and isn't it ironic if AIG also ends up seeing a collateral spring as a result of the US downgrade). Are we about to see the first (of many) truly unexpected consequence of the US downgrade? Stay tuned.