Shares in Research In Motion (RIM), the Canadian maker of the Blackberry phone and e-mail device, have fallen despite it reporting a doubling in profits.
RIM reported earnings for the three months to the end of May of $482.5m (£244.5m), up from $223.2m in the same period of last year.
But in after-hours electronic trading on Nasdaq, its shares fell 7.9%.
Analysts blamed the company's outlook for the next three months, which they said was worse than expected.
"It appears as if they are forecasting earnings for the next quarter to be slightly lower than the consensus estimates," said Duncan Stewart, president of Duncan Stewart Asset Management in Toronto.
RIM predicted earnings per share of between 84 and 89 cents, following a figure of 84 cents in the first three months.
But the company was upbeat about its figures.
"We are pleased to report another record quarter with revenue increasing 107% as the popularity of the BlackBerry platform continued to spread in business, government and consumer segments," said RIM co-chief executive Jim Balsillie.
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