JPMorgan, Wells Fargo and Bank of America were all down about 1 percent.
European shares earlier in the session were lower but later pared most losses. The S&P technology index fell 0.8 per cent, with Intel down 2.6 per cent after Goldman Sachs downgraded the stock to "sell". The Nasdaq Composite dropped 57.07 points, or 0.72 per cent, to 7,834.71 at the opening bell.
USA stock index futures fell about half a percent on Friday, tracking global shares, as the Turkish lira tumbled on concerns over the country's economy and its deepening rift with the United States.
The latter half of August into September is notoriously volatile and associated with some potential hiccups in the market, he said.
This earnings season has been stronger than analysts had expected.
The geopolitical turmoil in Turkey is certainly making waves across the global economies, particularly in the United States where the Dow Jones Industrial Average fell over 200 points today.
"We have been in a tug of war between broadly positive economic conditions and the uncertainty of trade risk", said Bill Northey, senior vice president at U.S. Bank Wealth Management in Helena, Montana.
Rite Aid (RAD.N) fell 10.6 percent and was the most actively traded stock after the drug store chain and USA grocer Albertsons Cos ABS.N agreed to terminate their merger agreement.
The dollar rose against most major currencies as investors bet global trade tensions and a robust US economy would continue to support the currency. Shares of Apple rose 0.8 per cent, while those of Amazon were up 0.6 per cent.
Bookings Holdings (BKNG.O) fell 5.9 percent and weighed the most on the S&P and the Nasdaq after it forecast third-quarter profit below expectations.
Sinclair dropped 2.9 percent after Tribune Media dropped its $3.9 billion deal to be acquired by Sinclair and filed a lawsuit against the company for breach of contract.