Thomson Reuters' London shares gain 7.3 per cent on delisting news

The shares rose as much as 7.3 per cent to 1750 pence, the biggest gain since 19 December, before falling back to 1720 pence. The London shares later gave up more of the gain, closing at 1690 pence, a rise of 59 pence or 3.62 per cent on the day.

Over the past year the London shares have traded at a discount of up to 20 per cent to the North American shares, although this has narrowed to about 10 per cent recently.

It was described as an arbitrageur’s dream, allowing investors to sell the more expensive North American shares and buy the cheaper British ones.

Thomson Reuters said on Monday it would remain listed on the Toronto Stock Exchange and New York Stock Exchange, while quitting the LSE and NASDAQ. ■