The iPhone maker said it anticipated revenue of $84bn for the three months to 29th December.
Apple has rattled investors with news that its sales have been slowing, blaming economic weakness in China.
In a surprise disclosure, the iPhone maker said it anticipated revenue of $84bn for the three months to 29th December.
In November it forecast sales of at least $89bn – a prediction that had already disappointed investors.
Apple’s share price sank more than 7% in after-hours trade, extending its more than 28% slide since November.
The festive season is typically Apple’s strongest quarter, but revenue of $84bn would mark and almost 5% fall from the same period last year, representing the firm’s first year-on-year quarterly decline since 2016.
In a letter to investors on Wednesday, chief executive Tim Cook said the firm’s sales problems were primarily in its Greater China region, which includes Hong Kong and Taiwan and accounts for almost 20% of its revenue.
Cook said: "While we anticipated some challenges in key emerging markets, we did not foresee the magnitude of the economic deceleration, particularly in Greater China,"
However he added that developed markets saw troubles as well, as fewer customers than expected chose to upgrade to Apple’s newest phones.
Wednesday’s cut to the sales forecast marked the first time Apple has revised its guidance to investors in more than 15 years.
It appeared to confirm doubts about the firm’s prospects that have troubled investors in recent months, contributing to the broader market sell-off.
Production cuts by major suppliers had led to worries that the firm’s newest phones were not gaining traction among buyers, in part due to high prices.
Analyst at Atlantic Equities, James Cordwell, said: "The question for investors will be the extent to which Apple's aggressive pricing has exacerbated this situation and what this means for the company's longer-term pricing power within its iPhone franchise,"Return to internet news headlines
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