Forrester is like Gartner one of the companies that is making very good technological analysis and comparisons and this reports covers industrial IoT players in the ecosystem. The important factors considered are analytics, integration with enterprise software and digital twin technology and out of 15 analyzed companies the leaders are IBM, Microsoft, SAP, PTC and C3 IoT. Apart from IBM that can hardly be ranked 1st since it doesn’t sell much to the industry the report seems quite correct. Here is the picture.
More information can be found here.