CHRONOLOGY: Subprime crisis affects banks worldwide

(Reuters) - UBS AG doubled its writedowns from the subprime crisis on Tuesday, dumped its chairman and sought more emergency capital in a second attempt to reverse its fortunes.

UBS wrote down an additional $19 billion in ailing assets, bringing to $37 billion its hit from the subprime crisis.

Here is a chronology of some of the major losses suffered by banks affected by the credit crisis:

February 8, 2007 - HSBC - Europe's biggest bank HSBC Holdings blames U.S. subprime defaults for its first-ever profit warning.

April 2 - NEW CENTURY - New Century Financial Corp. filed for bankruptcy protection amid a surge in homeowner defaults, the biggest mortgage lender to collapse in the slumping U.S. housing market. In March 2008 a federal bankruptcy judge cleared the way for New Century creditors to vote on a liquidation plan. According to the court, there were $35.1 billion of claims.

July 30 - HSBC says its charge for bad debts was $6.35 billion in the first half of the year, up 63 percent from $3.89 billion in the same period last year due to U.S. subprime loans.

August 9 - BNP PARIBAS - The French bank bars investors from redeeming cash in three funds as it was unable to calculate their value due to credit market turmoil.

September 13 - NORTHERN ROCK - Britain's biggest casualty of the credit crisis suffers a bank run after needing emergency funding from the Bank of England and is nationalized five months later.

October 15 - CITIGROUP, the largest U.S. bank by market value, says Q3 profit fell 57 percent due to losses, with net income down to $2.38 billion from $5.51 billion a year earlier.