My credit line with this card is pretty low ($4,500) so I asked for a $2,500 credit line increase. They sent me a document stating I need to provide the following additional information before processing my request:
Asset(s) amount - liquid assets including stocks, mutual funds, cash, money market accounts, and/or bond funds

I've never had any other credit card ask for my liquid assets. Have others had to do this/gone through with that?