The US Securities and Exchange Commission has banned shorting of these 19 stocks:

Fannie Mae

Freddie Mac

Allianz

BNP Paribas Securities

Bank of America

Barclays

Citigroup

Credit Suisse

Daiwa Securities

Deutsche Bank

Goldman Sachs

HSBC

JP Morgan Chase

Lehman Brothers

Merrill Lynch

Mizuho Financial

Morgan Stanley

Royal Bank of Scotland

UBS