While consumers might be revelling at the grilling banks are getting across the Ditch, the probe has not been good news for shareholders of Australia's major lenders.
Since the Royal Commission into Misconduct in the Banking, Superannuation and Financial Services industry was officially announced by the Aussie Government's on November 30 share prices across all the banks have slipped.
Commonwealth Bank of Australia, which owns ASB in New Zealand, has seen the biggest drop falling more than 9 per cent between November 29 and the market close on Tuesday.
Westpac is down around 7 per cent while ANZ has dropped more than 5 per cent. National Australia Bank, which owns the BNZ, has taken the smallest hit falling less than 2 per cent.
AMP shares received a hammering last week when it admitted to the inquiry that it had charged fees for advice never given resulting in a public apology and the early exit of its chief executive Craig Meller.