Patent areas of visa-sponsoring employers

Which technology areas do H-1B sponsors hold the most patents in?

Electric digital data processing, Transmission of digital information, and Information and communication technology are the technology areas visa-sponsoring employers concentrate their patents in, at 307,863; 139,876; and 62,693 granted patents. Ranked across 618 CPC subclasses held by 17,571 employers. Each count covers patents in an employer's five biggest areas, which is 62% of the 2,072,976 granted patents on record, so this ranks where patenting is concentrated rather than every patent held.