JP Morgan and Wells Fargo reported strong rises in profits on Friday for the second quarter of the year.
JP Morgan recorded a profit of $US6.5 billion, up 31% from a year ago.
The BBC reports it is regarded as a bellwether for the health of banking industry.
Separately, Wells Fargo reported a 20% rise in quarterly profits to $US5.27 billion as it set aside less money for bad loans. Revenue was little changed at $21.4 billion.
Provision for bad loans fell 64% to $US652 million.
Net revenues at JP Morgan's retail bank were slightly down from a year ago, but rose 10% at its investment bank, and also rose at its asset management unit.
The figures are the first the bank has posted since chairman and chief executive Jamie Dimon overwhelmingly won a shareholder referendum in May on whether he should hold both posts.
In a statement, he said the results showed a "strong performance across our businesses".