Tech Digest daily roundup: Sir Richard Branson sells $300 million stake in Virgin Galactic

British billionaire Sir Richard Branson has sold around $300m (£216.8m) of Virgin Galactic stock, leveraging his biggest listed asset to prop up other parts of his business empire. The 71-year-old offloaded almost 10.5m shares, equivalent to around 4pc of the space-travel company, through his Virgin Investments Group. This is the third sale Sir Branson has…