The financial sector, recently a weak performer in the stock market, will garner the majority of investor attention next week as a number of big banks post their quarterly results. Goldman Sachs Group Inc, Bank of America Corp, Wells Fargo & Co, Citigroup and JPMorgan Chase & Co – the five biggest U.S. banks by market cap – are due to report results as the sector has trailed the market in recent weeks and earnings estimates have fallen. In the last 30 days, banks have seen their estimates steadily lowered, with Goldman the biggest victim.