IG Group has warned that trading has been subdued in the final quarter and predicts full-year revenue to be slightly below expectations.However, the online trading company reassured investors that profit, earnings and cash generation remain on track, as operating costs continue to run slightly below plan.The firm also said volumes in the foreign exchange market have experienced historically low levels of volatility over the past few months. "The company continues to make good progress on the initiatives it outlined in January and will provide an update on these along with its results for full-year 2014 in July," the company said in a statement.RD