USCIS has published the denial report for 2018 at

https://www.uscis.gov/sites/default/files/USCIS/Resources/Reports%20and%20Studies/Immigration%20Forms%20Data/BAHA/h-1B-quarterly-requests-for-evidence-2015-2019-Q1-top-30-employers.pdf 

It is astonishing that numerous continuation cases are also being denied for major US corporations and it, unfortunately, is bound to have a ripple effect on the quality of work when people are required to stop work that they have been performing for a long time. Some major companies seem to have had more than 50% of their cases denied for their last year April filings.