Former Billabong CEO Matthew Perrin has been convicted of fraud and forgery offences after faking his ex-wife's signature to get a A$13.5 million (NZ$14m) loan from the Commonwealth Bank.
He mortgaged the family's A$15m property in Surfers Paradise without permission from his former partner Nicole Bricknell, who owned the house.
A jury on Tuesday found Perrin guilty of three counts of fraud and six of forgery, but was unable to reach a verdict on three further charges.
Last week the then-wife of Perrin told the court she thought he was going to admit he had been unfaithful again when he confessed, "I've done a lot of bad things".
But he replied "no, it's much worse than that" and told her "I've lost everything", including their A$15m, waterfront home.