IPCO International chief executive Quah Su-Ling, who is among eight clients sued in High Court over $79 million in losses sustained by Interactive Brokers (IB) in the wake of the penny stock crash, has alleged the US online brokerage was involved in a "commission-generating scheme".

According to court documents inspected by The Business Times, Ms Quah, who is seeking to unfreeze nearly $15 million in assets belonging to her and her company Sun Spirit Group, said she does not recall signing the broker's account-opening documents or completing any forms.

The large-volume trades in the shares of Asiasons Capital, Blumont Group and LionGold Corp from her account and that of Sun Spirit's happened because Ken Tai, owner of Algo Capital and her financial advisor, had exceeded his authority over the accounts, she said.