Legrand, the French electrical equipment maker which floated for €972m (€1.2bn) today, was forced to suspend trading for 15 minutes after soaring demand for its shares pushed the price beyond limits allowed on Euronext Paris.

The stock traded up as much as 26% within minutes of the market opening after pricing at the top of the range last night. Shares jumped nearly 21% immediately after starting trading and continued to rise in value, prompting Euronext to stop trading. The exchange's rules do not allow new issues to trade up more than 20% on their first day of trading.