Yikes! That might sound like a positive thing for bitcoin, but it kind of scares me. Just imagine if just a couple of those companies needed to dump their bitcoin holdings onto the market all at once--I would hope that they'd work out private deals instead of using exchanges, but who knows?
I can't see any heavyweight player ever going anywhere near any exchange. There's no depth and not enough appetite for the amounts they'd want to offload. Every time giant amounts have turned up like the Silk Road coins or Cumberland Mining's offer for all of the Gox coins, we get a glimpse of the OTC dark side. It'll be ready for any of this too.