Samsung Electronics, the world's largest maker of smartphones and semiconductors, missed analysts' estimates with its second-quarter earnings.
The company said it expected to post operating profit of around 14.8 trillion won (roughly US$13.2bn, or £10bn) for the three months to the end of June.
That would represent a 5% year-on-year improvement but was below the 15.1 trillion won analysts had been expecting.
Revenue in the quarter was expected to decline to 58 trillion won from 61 trillion the year before; analysts had pencilled in a figure of 60.3 trillion for revenue.
The company had sent up a red flag in April, cautioning that second-quarter profits in its mobile business would decline quarter-on-quarter "due to stagnant sales of flagship models amid weak demand and an increase in marketing expenses."
Samsung’s record profit run ends after reportedly slow Galaxy S9 sales https://t.co/43IXf1VAbY pic.twitter.com/Qlrw3S3o0H
— The Verge (@verge) July 6, 2018
The disappointing trading update appears to bring to an end a winning streak for the South Korean giant, which has reported record profits for every quarter over the preceding 12 months,
Analysts suggested that poor sales of the Galaxy S9 smartphone were behind the underperformance; some reports suggest the S9 has the lowest sales of any Samsung top-of-the-range phone since the Galaxy S3.
On Thursday, market research group Counterpoint Research said Apple's iPhone 8 had overtaken the Galaxy 9 Plus handset as the world's best-selling smartphone as a result of weak Galaxy 9 sales in Europe.
Samsung will release its second quarter results at the end of this month.