Ambac (NYSE:ABK) is down 4% after being downgraded.

MBIA (NYSE:MBI) is off over 5% after a downgrade.

Royal Caribbean (NYSE:RCL) is off 5% after a brokerage downgrade.

Continental (NYSE:CAL) is off 4% on news that it is unlikely to merger with another airline.

Stocks may trade differently in the pre-market than they do in the regular session.

Douglas A. McIntyre is an editor at 247wallst.com.