Manufacturer Foxconn, formally Hon Hai Precision Industry Co. Ltd., was working to boost production at another factory in the city of Shenzhen to make up for the shortfall, said the person, declining to be identified because the information was private.

Its main Zhengzhou plant in central China, which employs about 200,000 people, has been rocked by discontent over stringent measures to curb the spread of COVID-19, with several workers fleeing the site over the weekend.

The possible impact on production comes amid a traditionally busy time for electronics makers ahead of the year-end holiday season, which is also a prime time for vendors such as Apple.

Foxconn on Sunday said it was bringing the situation under control and would coordinate backup production with other plants to reduce any potential impact. Its share price closed down 1.4 percent on Monday versus a 1.3 percent rise in the broader market.

Apple did not respond to a request for comment.

Foxconn is Apple’s biggest iPhone maker, producing 70 percent of iPhone shipments globally, which in turn makes up 45 percent of the Taiwanese firm’s revenue, according to analysts at Taipei-based Fubon Research this month.

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