USCIS publishes information on H-1B RFEs for FY2015–FY2019 and the Top 30 H-1B Employers of FY2018
USCIS provides data on H-1B RFEs from FY2015 through the first quarter of FY2019, as well as data on the top 30 employers with the most H-1B petition approvals in fiscal year 2018.