It's not as sensitive than your credit history which is bought and sold by credit bureaus. It's also not as sensitive as all sorts of public records like foreclosures, personal bankruptcies, and criminal records.

Anyways, its likely subject to the FCRA which means you can get a copy of your own report once a year to see what it contains.

EDIT: Here you go, you can request a copy right here, https://www.theworknumber.com/Employees/DataReport/index.asp