I refer to the major vendors in the space as brokers because they re-sell data from sources you'd have a hard time negotiating with directly. The big ones are

I refer to the major vendors in the space as brokers because they re-sell data from sources you'd have a hard time negotiating with directly. The big ones are mainly legal tech giants and credit agencies. TransUnion makes a product called TLO, LexisNexis makes one called Accurint. I forget the names of the other products, but WestLaw/Bloomberg and Experian have them too.