KEY POINTS
  • Bank of America, U.S. Bancorp, PNC and Bank of New York Mellon all topped Wall Street's earnings estimates.
  • Bank executives warned that low interest rates hit to net interest margin growth, a widely-watched measure of profitability, could hurt future earnings. 

Shares of Bank of America, U.S. Bancorp, PNC and Bank of New York Mellon all ticked higher on Wednesday as the banks' profits topped Wall Street's forecasts.

But some of the banks' shares rolled over as executives warned the current lower interest rate environment is likely to hinder banks' net interest margin growth, a widely-watched measure of profitability. The Federal Reserve cut interest rates twice since July.