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Where do large corporations store their massive amounts of cash?
They are using several banks, hedge funds or other financial institutions, in order to diversify the risk inherent to the fact that the firm holding (a fraction of) their cash, can be insolvent which would makes them incur a really big loss. Also, the most available form of cash is very often reinvested everyday in overnight*products and any other highly liquid products, so that it can be available quickly if needed. Since they are aware that they are not likely to need all of their cash in one day, they also use longer terms or less liquid investments (bonds, stocks, etc..).