Trending @Infosys; Received an email to share my employee number and my reporting manager details

I have received an email from one of tech leads under our DM to share my employee id/email id and my reporting manager details. Email was made bcc intentional. When I called that lead, she mentioned that she doesn't know the reason and she was asked by the senior management to send the email to hundreds of other employees too and that is why she made the email as bcc intentional. Anyone has any idea what may be the reason?