WBC

Commonwealth Bank (ASX:CBA)and Westpac (ASX:WBC) cancelled a number of credit cards due to a potential security breach. Both banks confirm that the cards had been compromised and may leave them vulnerable to fraud.

Shares from National Australia Bank's (ASX:NAB), Westpac (ASX:WBC), ANZ Bank (ASX:ANZ), and Commonwealth Bank (ASX:CBA) plummet as

Banking giant Westpac (ASX:WBC) announced today that chairman Ted Evans will step down in December and will be replaced by director and former KPMG boss Lindsay Maxsted. Evans, a former Reserve Bank of Australia director, took over the Westpac board in 2008.

Westpac (ASX:WBC) rejected claims of opposing carbon pricing and maintains that they support the government's plan to a greener economy by placing a price on pollution. Chief executive Gail Kelly stated that "Our position with regard to carbon has been consistent and been a long-held position."

Troubles in Westpac's (ASX:WBC) mortgages sector were blamed on cost of living pressures and higher interest rates by chief executive Gail Kelly. Kelly quashed the claims that Westpac's aggressive lending was a factor in the mortgage woes.

Technical issues stopped Westpac (ASX:WBC) services after the shut down of its data centre. Customers reported that they have difficulty in using the company's online banking, ATM and EFTPOS services.

Westpac's (ASX:WBC) first half net cash profit added 38 percent or $3.961 billion for the six months to end of March, after mortgage price increases in November and reduced bad debt charges.

Winners of the week for the ASX100. These stocks increased their share price by the largest percentage on the Australian sharemarket, the Australian Stock Exchange (ASX) from the previous week of trading (15th week: 11th April to 15th April 2011). Stocks included in this list include: MYR, TAH, TSE, DJS, ILU, TEL, SEK, WES, WBC, CCL. Other lists of ASX companies by market capitalisation.

Best Performing Australian Stocks of the Week on the ASX100 (XTO) for the week. These stocks increased their share price by the largest percentage on the Australian sharemarket, the Australian Securities Exchange (ASX) from the previous week of trading (6th week: 7th February to 11th February 2011). Other lists of ASX companies by market capitalisation.

ASX 100 Stocks which Underperformed from these ASX top 100 companies this week. These stocks decreased their share price by the largest percentage on the Australian sharemarket, the Australian Securities Exchange (ASX) from the previous week of trading (51st week: 20th December to 24th December 2010). Stock which underperformed this week included: WDC, PPT, LEI, AWC, TCL, DOW, APA, QAN, SHL, TOL, ASX, BOQ, NCM, WBC, CEU.