U.S. stock index futures pointed to a flat to slightly higher open Thursday as investors eyed oil prices and earnings from major financial institutions. U.S. crude oil futures traded about 0.8 percent higher around $42.10 a barrel as of 8:45 a.m. ET.

Wells Fargo Bank in San Francisco. Adam Jeffery | CNBC

Several big financials posted quarterly results on Thursday, including Bank of America and BlackRock.

Bank of America reported an 18 percent slide in quarterly profit as concerns about a global economic slowdown and uncertainty about the pace of U.S. interest rate increases dampened bond and stock trading.

BlackRock, the world's largest asset manager, posted a on Thursday amid a dramatic reversal in financial markets. Wells Fargo reported a as the third-largest U.S. bank by assets set aside more money to cover bad loans, mainly to energy companies.

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Citigroup will then report on Friday.

Bank stocks rose on Wednesday after JPMorgan Chase reported better-than-expected numbers. The Dow-listed bank's first-quarter earnings per share came in at $1.35, while revenue totaled $24.08 billion.

The Federal Deposit Insurance Corporation announced on Wednesday that five U.S. major banks, including JPMorgan, Bank of America and Wells Fargo, lacked resolution plans that showed they could go bankrupt without disrupting the broader financial system. The lenders have until October 2016 to rewrite their plans.