https://www.reuters.com/article/us-ring-m-a-amazon-com/amazon-set-to-buy-ring-in-a-deal-valued-at-over-1-billion-source-idUSKCN1GB2VG >Amazon.com Inc is set to buy privately held Ring for more than $1 billion, a source familiar with the matter told Reuters, as the tech giant looks to expand into the home security space.