On April 1st, the USCIS announced that it has launched a site were the public may find out which companies have filed H-1B petitions by NAICS code, employer name, city, state or zip code. The site also provides information for calculating approval and denial rates. See: https://www.uscis.gov/news/alerts/uscis-launches-h-1b-employer-data-hub for details and a link to the “H-1B Employer Data Hub”
