Liquidators are closing in on money lost through the Ross Asset Management group of companies.

The group was found to be a Ponzi scheme, but some investors managed to withdraw millions before it collapsed.

Now liquidators are trying to claw back some of the $115m lost.

That's to secure money for about 1200 rightful investors.

Liquidators say they have a valid claim on any funds withdrawn from the investment scheme since December 2010.

At least three investors withdrew almost $4m in the lead-up to the company's collapse in 2012.