U.K. chip company Graphcore has been formally acquired by Japan’s SoftBank. Rumors of the deal have abounded for some time, but protracted negotiations and regulatory approvals have meant neither company has confirmed anything until now. Even today, the company wouldn’t confirm the one thing most people will be wondering: How much does Japanese multinational SoftBank value a startup touted as a potential rival to the mighty Nvidia in the AI chip space? While the figure of $500 million has been b...