I think Apple is moving up too fast. It moved outside of a well established channel on 6th February and is rising furiously. The volumes are also spiking up making me think that price increases are more the result of speculation than investment (even if the multiple is still reasonable).
I am worried that Apple will peak and fall back into the normal channel, which could take it all the way down from the $590s to the $400s.
I have today placed a stop loss at $560 (5% below the current price). This limits my downside and ensures a profit. If the climb continues I can set the stop loss to a higher price and lock in even more profit.