We are watching game theory in practice. Many funds etc. want or need to buy the stock. If those buyers were able to cooperate and trust each other they would all buy slowly so as not to make the price spike and cost them more money. That works until one of them starts to get a little greedy (think Prisoner's dilemma) so that guy buys a little faster hoping to jump the gun on his peers. That causes others to consider doing the same.
On top of that you have traders and speculators and a million other actors who also have an interest in increasing SP or suppressing it. My guess is that we see this "slow" daily increase until the damn breaks, then who knows what will happen.
Don't disagree with any of this, except for the fact that you use present tense. TSLA volume is way too low right now for any of this to be currently going on. If there are buyers, it's definitely not anybody big. I think the main reason for the rise from $410 to $550 has been some speculation, and mostly the fact that almost nobody is selling. TSLA is trading at ATHs like it's just another day at the office.