Investing.com -- Apple (NASDAQ: AAPL) plunged 4% Tuesday, making it the largest decliner in the Dow, as multiple negative headlines weighed on shares.

The stock fell following a Nikkei Asia report Monday that the company has encountered setbacks in the engineering test phase of its first foldable iPhone, which could delay mass production and shipment schedules. Engineering development issues could push the first shipments of foldable iPhones back by months in a worst-case scenario, according to the report citing sources familiar with the matter. Nikkei had previously reported in January that Apple would focus on delivering its first foldable iPhone and two non-folding models with upgraded cameras and larger displays for a flagship launch in the second half of 2026.

App Store data also pressured shares. According to UBS analyst David Vogt, App Store data from Sensor Tower showed reported growth of approximately 7% in the March 2026 quarter, weighed down by flat growth in the U.S. On a foreign exchange neutral basis, the App Store grew approximately 5% in the March quarter, consistent with the December quarter.

Evercore ISI analyst Amit Daryanani also noted that App Store growth slowed in March as renewed Gaming weakness weighed on overall momentum, with Gaming revenues down 1% YoY. The U.S. declined 2% YoY and Japan fell 3%, both reversing to negative territory, while China showed 7% growth.

Apple had risen 5% over the prior four days before Tuesday’s decline. The 4% decline outpaced declines in the Nasdaq 100.