JPMorgan Chase surprised Wall Street when the bank's third-quarter earnings report appeared very early on Tuesday, several hours sooner than expected.
"At approximately 3.36 AM EST, Shareholder.com inadvertently made a supplemental earnings file from JP Morgan Chase's third-quarter earnings announcement publicly accessible," Nasdaq said in a statement. "The root cause was a human error internally at Shareholder.com. The issue was contained only to JPMorgan Chase and did not impact any other Shareholder.com clients."
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In 2006, Nasdaq acquired Shareholder.com, which specializes in shareholder communication and investor relations intelligence services.
JPMorgan later confirmed the leaked document, with the biggest U.S. bank posting earnings of $1.36 a share on revenue of $25.1 billion.
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Citigroup and Wells Fargo also reported quarterly results before the bell on Tuesday.