Apple Inc. (AAPL.O) shares spiked on Tuesday after the U.S. delayed a 10 per cent tariff on certain Chinese imports, including such technology products as cell phones and laptop computers.

The stock jumped as much as 5.2 per cent, its biggest one-day percentage gain since July.

The iPhone maker is highly correlated to trade issues with China, given the country is both a key part of its supply chain as well as a major source of revenue. According to data compiled by Bloomberg, nearly 20 per cent of Apple’s 2018 revenue was derived from China, with cell phones a dominant part of its overall business. The company’s iPhone represents more than 60 per cent of its sales.

The 10 per cent tariff had been seen as a major potential headwind. According to Wedbush analyst Daniel Ives, the tariffs would have lowered Apple’s 2020 earnings by 50 to 55 cents a share had they gone into effect. (The consensus is for earnings of US$12.76 a share in 2020, per Bloomberg data.)

“The overall China tariff/demand situation represents a US$20-$25 overhang on Apple shares and will remain a lingering cloud over the story in the near-term,” Ives wrote in a note published Aug. 13, prior to the news about the tariff delay.

Apple was not the only company to spike off the news, with the Philadelphia Semiconductor Index jumping as much as 2.6 per cent in morning trading. Chipmakers have been among the most impacted by trade-related uncertainty; on Monday, Cowen wrote that a demand recovery for the industry was “likely capped until a trade resolution is reached.”

Among specific semiconductor stocks, Texas Instruments rose 2.4 per cent, Micron Technology spiked 6.2 per cent and Applied Materials was up 2.5 per cent.

Best Buy Co Inc., the technology retailer, surged 8.3 per cent following the news of the delay.