Samsung has recorded its lowest share of the smartphone market since late 2014, with analysts blaming problems with the Galaxy Note 7 for the decline.
Market researchers IDC say Samsung sold 72.5 million smartphones between July and September.
While that means it's still the top global smartphone supplier with 20% of the market, its share slid by 13.5% compared with the same period last year.
Apple saw its share drop by 5.3%, having sold 45.5 million iPhones. The big winners were Huawei, with 23% growth, and rival Chinese manufacturers Oppo and Vivo, which both doubled their market share.
It’s Samsung’s struggles, though, which have grabbed the headlines.
Worryingly for the Korean company, its Galaxy Note 7 problems only became clear towards the end of August, meaning its sales likely suffered heavily in September.
That suggests it could be facing a bigger decline in the final quarter of 2016.
Samsung this week rolled out new software for the Galaxy Note 7 which caps the device’s battery at 60%.
It has urged anyone who still has the phone to return it immediately, after it was found that some units featured exploding batteries.