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Bad omen for Apple report as supplier shares sink

Peter Parks | AFP | Getty Images

Shares of companies that make chips for the iPhone took it on the chin Monday after weaker-than-expected results from a key Apple supplier.

Apple's stock followed, dropping more than 2 percent in mid-morning trading, as investors took this as a sign the world's biggest technology company will say future sales of the iPhone may disappoint Wall Street when it reports quarterly earnings Tuesday evening.

Here's why: