According to new research data from Strategy Analytics, the Apple Watch made up the bulk of smartwatch shipments during the holiday quarter in 2015. The firm estimates that about 8.1 million smartwatches were shipped, out of which Apple is thought to have shipped 5.1 million.

From Strategy Analytics:

Cliff Raskind, Director at Strategy Analytics, said, "We estimate global smartwatch shipments reached 8.1 million units in Q4 2015, rising a healthy 316 percent from 1.9 million in Q4 2014. Smartwatches are growing rapidly in North America, Western Europe and Asia. Apple Watch captured an impressive 63 percent share of the global smartwatch market in Q4 2015, followed by Samsung with 16 percent.

At the same time last year, it was thought that 1.9 million smartwatches had been shipped. According to Strategy Analytics, a smartwatch is a "computerized wristwatch with a high-level or expandable operating system," encompassing products like the Apple Watch, Pebble, and Android Wear watches.

The group also estimates that around 7.9 million more traditional Swiss watches were shipped. This would be the first quarter in which smartwatch shipments had outpaced those of traditional watches.

Source: Strategy Analytics