Shares of Apple fell five percent in trading Monday after a key supplier of iPhone technology cut its financial outlook, exacerbating concerns on Wall Street about sagging demand for the smartphone.

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Lumentum Holdings, which is a major supplier of facial recognition technology used in the newest versions of the iPhone, slashed its revenue expectations by $70 million after noting that a major customer had reduced parts shipments. While the company did not mention Apple by name, the tech giant was responsible for 30 percent of its overall revenue in fiscal 2018.

“We recently received a request from one of our largest Industrial and Consumer customers for laser diodes for 3D sensing to materially reduce shipments to them during our fiscal second quarter for previously placed orders that were originally scheduled for delivery during the quarter,” Lumentum CEO Alan Lowe said in a statement.

Ticker Security Last Change %Chg
AAPL APPLE INC. 194.17 -10.30 -5.04%

Wells Fargo said in a research note that Lumentum’s chance in guidance suggested “as much as a 30 percent cut in Apple orders.” Elazar Capital also identified Apple as Lumentum’s client, Reuters reported.

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