Trading platform CMC Markets Plc said on Thursday that it remains on track to deliver annual net operating income in line with previous guidance.
In a very brief trading update for the period from 1 October to the end of December 2024, the company also said it was still set to meet its costs guidance of about £225m, excluding variable remuneration and non-recurring charges.
At 0835 GMT, the shares were down 8.5% at 242.50p.
Shore Capital analyst Vivek Raja said: "The share price has been strong over the past couple of weeks, so to the extent the market was expecting a more positive trading update today (perhaps more news on how the Revolut partnership has progressed), we could imagine weakness today."
Shore has a 'hold' recommendation on the stock.