Explainer: Why has the UK intervened in Nvidia’s $40bn Arm merger? Nvidia founder and boss Jensen Huang (Getty Images) Ever since it was announced in September last year, Nvidia’s proposed $40bn (£30bn) takeover of British chipmaker Arm has proved controversial. Critics including rival tech firms and former Arm executives were quick to hit out at the deal, warning of a negative impact for Britain and the semiconductor industry more widely. Yesterday the government made a rare intervention, ordering an investigation into the planned tie-up. But what are the concerns and what does it mean for the UK’s M&A market?