On March 17 Apple’s chief operating officer, Sabih Khan, visited Shenzhen, opening his latest series of inspections of the company’s China operations with a tour of the Apple Shenzhen Application Research Laboratory in the Futian bonded zone and follow-up visits to battery-maker Sunwoda and assembly giant Foxconn. A 30-year Apple veteran who joined the executive team in 2019 and became COO in July 2025, Khan has travelled to China more than 50 times—his itinerary underlining both operational priorities and a broader corporate signal about Apple’s relationship with China.
The Shenzhen Application Research Laboratory, brought into service in 2024, is the newest node in Apple’s domestic testing network and handles reliability work for iPhone, iPad and Apple Vision Pro. Placing the facility in a bonded zone lets Apple move prototypes and samples between suppliers and the lab very quickly—often within a day—shortening the testing loop and accelerating problem resolution before mass production. Apple has invested heavily in similar facilities: over the past five years the company says it has put more than RMB 1 billion into application research labs in Shenzhen and Shanghai, with additional R&D centers in Beijing, Suzhou and elsewhere.
The lab’s demonstrations were pragmatic rather than glamorous: controlled drop tests for MacBook Airs, random-drop simulations for iPad Airs, and staged water-exposure trials that range from IPX3 rain simulations to IPX8, a six-metre pressurised immersion. Engineers also simulate liquid spills such as coffee and fruit juice and soak devices in pool and seawater to validate real-world durability claims. The goal is to create a fast feedback loop between design, prototyping and production so that design choices and materials can be improved before units reach factories at scale.
Beyond the lab, Khan toured Sunwoda’s highly automated iPhone battery lines and Foxconn’s mainboard and final-assembly operations in Shenzhen. Sunwoda has been an Apple partner for two decades and uses digital-twin systems to enable remote maintenance and to optimise production parameters. Foxconn—Apple’s partner since the first iPhone and still the largest assembler of iPhones—showed Khan its intelligent centralised production-control systems and smart-materials warehouses that coordinate robots, automated guided vehicles and high-density storage to meet 24-hour production demands.
The visit comes amid two concurrent realities: Apple’s intensifying operational ties with China and the company’s public push to diversify manufacturing outside the mainland. Greater China remains one of Apple’s largest markets: the company’s fiscal first-quarter 2026 results showed Greater China revenue of $25.53 billion, a 38% year-on-year increase driven by demand for the iPhone 17 and marking a record quarter. At the same time, more than 80% of Apple’s top 200 global suppliers maintain production in China, and Guangdong—especially Shenzhen—has become a dense cluster for parts and assembly.
That industrial concentration confers clear efficiencies. The proximity of component suppliers, contract manufacturers and now testing facilities reduces lead times and cost, enabling rapid iteration on prototypes and speedy resolution of manufacturing defects. Digital twins, automated lines and intelligent warehousing further compress cycle times and improve yield, advantages that are hard to replicate in nascent supply bases elsewhere.
But reliance on China also carries political and operational risks. Rising US–China strategic competition, export controls on advanced chips and equipment, patchy logistics during crises, and the prospect of regulatory pressure from either government can all threaten continuity. Apple’s visits and investments therefore perform a dual function: they are both practical attempts to reinforce quality control and a diplomatic signal that the company values the depth of its Chinese partnerships even as it hedges elsewhere.
Sabih Khan’s Shenzhen trip is thus both operational and symbolic. By embedding high-level executives in frontline supplier visits and by expanding local testing and R&D capabilities, Apple is doubling down on China as an essential node in its global manufacturing system. Expect more targeted local investment in testing, digitalisation and supplier development—alongside continued, measured efforts to diversify production footprints to India, Vietnam and beyond.
For international observers and competitors, the visit is a reminder that supply-chain resilience is a layered strategy: diversify geographies where feasible, but preserve and deepen links where scale, skill and supplier ecosystems remain irreplaceable. Apple’s approach demonstrates how a global tech company can balance commercial imperatives, product quality needs and geopolitical risk management in an increasingly contested industrial landscape.