The chairman of failed Sydney stockbroking firm BBY took advice from a self-proclaimed psychic when preparing budget estimates and cashflow forecasts, the NSW Supreme Court has heard.

Accounting firm KPMG is conducting a liquidators' examination into the demise of BBY, which collapsed in May 2015 owing an estimated $61 million to clients.

Stockbroking firm BBY took advice from a self-proclaimed psychic. Credit:Robert Banks

It has described the spectacular collapse of the firm, majority owned by former tennis great Ken Rosewall and his son Glenn, as the largest failure of an Australian stockbroking firm since the global financial crisis.

At an explosive hearing on Thursday, former strategy manager April Yuen said self-proclaimed psychic and vibrational healer Nevine Rottinger provided guidance to Glenn Rosewall, the company's executive chairman.