Dodgy mortgage brokers, real estate agents and solicitors are being targeted by investigators after the latest arrest linked to a $200 million fraud syndicate.

NAB insider Timotius Donny Sungkar will spend at least three weeks in custody after allegedly using his position to deliver shonky business loans worth about $10 million.

The Sydney man's arrest is the most recent in a string of busts targeting a group that allegedly used stolen personal information to apply for loans to buy non-existent luxury "ghost cars".

Police estimate the syndicate is worth more than $200 million, saying the total figure "could get to at least a quarter of a billion".

"In my time investigating corporate corruption matters of this magnitude, it would have to be in the top three that I've ever seen," Financi

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