Norwegian software giant Visma is reportedly planning a €19 billion IPO in London, a potential boost for the UK stock market. The company, specializing in accounting, payroll, and HR software, had previously considered Amsterdam. This decision marks a possible reversal of the recent trend of companies shunning the London Stock Exchange, contingent on Downing Street's promised market reforms. Visma's value has significantly increased since Hg acquired a 70% stake in 2006 for €445 million.