US STOCKS-Wall Street mixed as Apple rises and banks warn about oil
* Big banks fall; weigh on financial sector
* JP Morgan down after signaling rough first quarter
* Indexes: Dow down 0.12 pct, S&P flat, Nasdaq up 0.64 pct (Updates to afternoon)
By Noel Randewich
Feb 24 (Reuters) - U.S. stocks were mixed on Wednesday as investors focused on banks' vulnerability to decade-low oil prices that have left energy companies struggling to pay their debts and a rise in Apple propped up the S&P 500.
Six of the 10 major S&P sectors were higher, with telecoms up 0.55 percent thanks to a 0.77 percent increase in AT&T.
The S&P financial sector, already the worst performing sector this year, fell 0.69 percent and was the biggest loser among the sectors.
Shares of Wells Fargo, JPMorgan, Goldman Sachs, Morgan Stanley and Citigroup were among the worst hit.
JPMorgan flagged declining investment banking revenue and raised its provisions for energy loan losses, while Morgan Stanley said most of its energy loans were to non-investment grade firms. Continuación...