The tech giant has earned 17 percent of the global wearables market, with Xiaomi following behind by 500,000 shipments in the second quarter of 2018.
According to a report by research firm IDC, there has been a higher demand for fully featured smartwatches, rather than cheaper fitness trackers such as the Fitbit.
IDC's wearables research director Ramon T. Llamas explained: "Basic wearables have been in decline over the past several quarters, but that does not mean that they no longer have a place in the market.
"There still exists multiple market segments who prefer simple and inexpensive wearable devices and this is where wrist-worn fitness trackers and hybrid watches are finding demand."
Meanwhile, it was recently revealed that one of Apple's self-driving vehicles was involved in a minor crash in California.
The state's road authority confirmed that the modified Lexus RX450h was rear-ended by a human driver, who was behind the wheel of a Nissan Leaf.
An incident description explained: "An Apple test vehicle in autonomous mode was rear-ended while preparing to merge onto Lawrence Expressway South from Kifer Road.
"The Apple test vehicle was travelling less than 1mph waiting for a safe gap to complete the merge when a 2016 Nissan Leaf contacted the Apple test vehicle at approximately 15mph.
"Both vehicles sustained damage and no injuries were reported by either party."