Icahn's tweet caused the stock to break from its channel resistance.
The stock has quickly approached its longer-term resistance, between 500-525.
Not really sure why icahn's tweet inspired such bullishness, considering Apple is already buying 60x what Icahn is assumed to have positioned. Also not sure Icahn will do much of anything at Apple. Apple already has the largest buyback in history, and has already shown it will make aggressive purchases.