This Company Added the Word ‘Blockchain’ to Its Name and Saw Its Shares Surge 394%

Green light illuminates data cable terminals inside a communications room at an office in London, U.K., on Monday, May 15, 2017. Governments and companies around the world began to gain the upper hand against the first wave of an unrivaled global cyberattack, even as the assault was poised to continue claiming victims this week.

Photographer: Chris Ratcliffe/Bloomberg
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A British company that has been investing in internet and information businesses is having its best day on record.

On-line Plc jumped as much as 394 percent on Friday after announcing plans to change its name to On-line Blockchain Plc, following an initial climb of 19 percent on Thursday when it first announced the news. It’s the biggest one-day gain for the small-cap company since its December 1996 listing. The trading volume that reached 2.9 million shares by early afternoon in London is equal to more than 16 times the entire year’s trading before the last two days.