I'm just speculating on this particular case involving Ethereum, I don't actually know. But that's what made the price tank last week - one individual sold all of theirs at once and the price dropped, but only temporarily.
Investors switch their positions all the time, it's how they make money. Even if Ethereum looks promising for the future, someone may have needed the capital that was tied up in it so they liquidated in order to take a new position/opportunity.
Could be true but looking at the value of transaction (price and volume required by the buyer), it has to exceed over $500 million before all the limit orders were filled. Let's see what happens by EOD today. EOS would have launched by then.
I'll definitely be keeping an eye on it. Thanks for the updates!