I very seriously doubt we'll hear FDA approval of Tysabri before Christmas. The FDA doesn't move that fast, even when something's fast-tracked.
I'm expecting March.
And if you're in ELN for trading, I'd put a stop loss at $12.74. If it loses $12.75, it could tank big. But if it does, watch for a bottom because when it hits them, it reverses big and fast.
I'm committed to my position, though. I trade a few shares here and there but the core position won't be for sale until March, if then.
Regarding ELN not being green despite the Dow being green, it rarely moves with the Dow. SANM, however, used to move very reliably with the Nas. Hasn't in a long time, but it used to be that it'd move the same direction as the Nas and trail it by enough minutes to profitably trade off of knowing that.