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Swiss authorities are investigating the mega-acquisition of Credit Suisse, the country's second-largest bank, by UBS, its largest. The deal, worth a measly $3.5 billion, would reportedly make UBS the world's top bank wealth manager, with over $4 trillion in assets under management.

Both Credit Suisse and UBS manage assets that are well beyond their institutional size because they are mostly global banks that invest on behalf of wealthy global clients. But the merger won’t turn them into one of the world’s biggest banks by assets – the size of what a bank has on its balance sheet.

If a bank goes belly up, what's vulnerable are not the assets but rather the deposits, which are normally insured by governments up to a certain limit, and the role of managing investments can easily be taken over by another wealth manager. We take a look at the world's top five banks by overall assets compared to the amount of wealth they invest for their clients.