Dealers work at their desks whilst screens show market data following a vote on Prime Minister Theresa May's Brexit 'plan B' at CMC Markets
Dealers work at their desks whilst screens show market data following a vote on Prime Minister Theresa May’s Brexit ‘plan B’ at CMC Markets

By Muvija M and Noor Zainab Hussain

(Reuters) – Shares in CMC Markets Plc slid more than 10 percent on Wednesday after the online trading firm forecast a drop in income in the year to March as new rules curbed client activity, and a senior executive decided to depart.

The profit warning dragged down shares in Britain’s biggest online trading firms IG Group and Plus500 Ltd.

Regulators are tightening rules on products that allow anyone with a bank card to make highly leveraged bets on financial markets through apps and online platforms.

CMC Markets said it expected net operating income of 131 million pounds ($172.17 million) for the year to March 31, compared with 187.1 million pounds a year before.

It also forecast a 37 percent drop in revenue to 110…