Trading in Google shares has been suspended after the internet giant released its third-quarter results early by mistake.
Third-quarter profits fell 20% on a year earlier to $2.18bn (£1.35bn) and below analysts' expectations.
Google blamed financial printing firm RR Donnelley for filing an early draft of the results, which had been expected after the closing bell.
Shares in Google were down 9% before trading in the stock was suspended.
In a statement, Google said: "Earlier this morning RR Donnelley, the financial printer, informed us that they had filed our draft 8K earnings statement without authorisation.
"We have ceased trading on Nasdaq while we work to finalise the document. Once it's finalised we will release our earnings, resume trading on Nasdaq and hold our earnings call as normal at 1:30 PST."
The company's results statement, filed with the Securities and Exchange Commission, says "PENDING LARRY QUOTE" at the beginning, referring to Google chief executive Larry Page and indicating that it was not ready for publication.
Net revenue rose to $11.3bn from $7.5bn, but was still below forecasts.
The slide in Google's share price took the company's market value back down below that of Microsoft, which it had overtaken earlier this month.
Joe Saluzzi from Themis Trading said "you can't make those mistakes any more".
He added: "Mistake or not the earnings are earnings," he said. "The problem is when this happens in the middle of the day, there is no time for a conference call to massage it, there is no time for analysts' questions and for an evaluation."
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