The Registrar of Companies has confirmed she is looking into Mainzeal and the Richina group of companies, including whether they met their financial reporting obligations.
Mainzeal, the country's third largest construction company, went into receivership in February and is now being liquidated. Its parent company was Richina Finance, owned by Richard Yan, and most of the other companies in the group owned by Mr Yan are also now in liquidation or receivership.
A spokesperson for registrar Mandy McDonald says the liquidators and receivers of the group are required to report any suspected offending and then the registrar decides what action to take.
The spokesperson says recent amalgamations and restructures had made the Richina group more complex.