The corporate regulator has announced there will be no further penalties against executives from the collapsed fuel additives business Firepower.

It is six years since Firepower collapsed, leaving investors who had poured $100 million into the company with nothing to show for it.

The business had spent liberally on sporting sponsorships and celebrity connections to promote its fuel additives, which were subsequently discredited.

The Australian Securities and Investments Commission (ASIC) was successful three years ago in banning Firepower chairman Tim Johnston from managing another company for 20 years, while another executive was banned for six years.

The regulator says it has now finalised its investigation into possible criminal charges.

ASIC says the Commonwealth Director of Public Prosecutions has reviewed its brief of evidence and decided there is not a reasonable prospect of securing a conviction against Mr Johnston or anyone else linked to the company.