Bank of America Corp. shares hit a two-year low Monday. The stock fell 3.6% in midday trading, hitting a low of $9.53. It is the only large bank with a share price in the single digits. Most bank stocks fell Monday on fears about the effect of a potential U.S. government debt default. Banks hold large amounts of U.S. Treasurys as liquid assets to use almost like cash on hand. Citigroup Inc.'s shares are down 3.5% to $37, J.P. Morgan Chase & Co.' stock was down 1.3% to $39.50, and Wells Fargo & Co.'s shares fell 2.4% to $26.52. However, investors have been selling off Bank of America stock for several months. In the past 12 months, its stock has fallen 35%, making it the third worst performing stock in the Standard & Poor's 500 index. On Friday, the stock fell below $10 for the first time since May 2009. The stock had traded as low as $2.53 in February 2009 during the throes of the financial crisis.