I'm not too familiar with this, but I have read a few stories on Bloomberg about some of the large investment banks selling chunks of shares of Uber to their clients. Just the other day they said they reduced the minimum order size as well (I think they said $25k).

I have done zero digging, but it doesn't shock me that people at JP Morgan and other investment banks are making calls to their private wealth management clients to offer them shares in large private 'unicorns'