Huawei rose to the first place and replaced Samsung with a 18.5% share, followed by Xiaomi, 18%, according to estimates of an industry report seen by VnExpress which shows the latest data available.
Samsung came third with its share plunging by half from 37% in the first quarter to 15%.
Apple ranked fourth with a 6% share.
Vietnam’s smart wearables market, which comprises mostly of smartwatches, has seen strong changes in recent years.
Samsung, for example, has been recording market share between 6% and nearly 38% since early 2021.
Apple claimed 30% market share by the end of last year only to have 6% by the end of June.
Huawei has seen its share surging from 2% earlier last year to 18.5% thanks to its increased focus on wearable gadgets, with the most best-selling products being Watch GT3 and Band 7.
It plans to launch a new Watch GT3 SE with a battery of up to two weeks.
Xiaomi has been drawing attention with its affordable products SmartBand 7 and SmartBand 7 Pro.
A report by U.S.-based data company IDC shows that 140,000 smart wearables were bought in Vietnam in the second quarter, up 1.5 times from the third quarter last year when Covid-19 was spreading fast.
Globally smartwatch sales have declined by 6.9% year-on-year to 107.4 million units in the second quarter.