Nineteen academy schools are to be investigated for "flouting" rules on transparency following a BBC investigation.
The schools have not published a register of all their governors' interests, against official rules.
Education campaigners say there is "a culture of secrecy" around some academies.
The Department for Education (DfE) said the "rules were clear" and it would investigate.
BBC England's data unit selected 100 academies across England at random and found 19 of them had not either published a current register of interests for…