"Ngai Tahu has launched an internal investigation following a serious leak of personal staff information.
In a statement to the Otago Daily Times, Te Runanga o Ngai Tahu chief executive Anake Goodall confirmed an internal investigation had begun after a "serious breach of personal staff information".
Mr Goodall said the breach went against the "behaviour that we expect from each other".
The ODT understands group employee information was sent anonymously to several iwi members, who then alerted management.
"The disclosure of this information exposes the Te Runanga Group, the person who released it and anyone who passes the information on to potential legal sanctions," Mr Goodall and Ngai Tahu kaiwhakahaere (chairman) Mark Solomon said earlier to iwi members."Good luck with sorting this out.