Plus500 said its financial performance is now tracking ahead of market expectations after third-quarter revenues reached a record.
Revenue in the three months through September rose 50% to $116.5m.
For the nine months through September, revenue rose 29% to $304.9M.
"Plus500 has attracted a record number of new customers and active customers so far this year through its efficient investment in marketing and its retention initiatives, providing good momentum for the final quarter of 2017 and going into 2018," the company said.
"Accordingly, the board believes that the company is on track to report results which are ahead of market expectations for the year as a whole."
At 8:04am: (LON:PLUS) Plus500 Ltd share price was +38.5p at 1035p