
Amazon.com Inc. will face a formal European Union antitrust investigation into its dealings with third-party merchants, expanding a multipronged regulatory push that has ensnared other big Silicon Valley giants like Facebook Inc. and Alphabet Inc.’s Google.
The European Commission, the EU’s top antitrust enforcer, said Wednesday that its investigation will look into whether Amazon is abusing its dual role as both the provider of a marketplace where independent sellers can offer products and a retailer of products in its own right.
In particular, the probe will investigate whether Amazon is using nonpublic data from independent merchants to compete against them. Investigators will also examine what data Amazon uses to pick a seller as the default option for a given product when a user clicks the “buy” button—and whether Amazon gets an unfair leg up to be that default.