There are plenty of articles about SRPT's fundamentals, so I wanted to comment on the technicals. An O'Neil high tight flag (HTF) is a very powerful technical formation. The quick definition: It's when a stock doubles (100-120%) in a short period of time (3-5 weeks) and barely corrects (25% or less) over a few weeks. Coming out of these formations, stocks can double or triple in a short period of time.
What's amazing about SRPT is that it's done it twice!!! It went from 4 to 10, consolidated around 8 (1st HTF) and then doubled to 16. Now, it looks to be forming a 2nd HTF as it barely corrected again (down to 12.5) and is ready to take out 16 again.
A fairly recent example of a biotech HTF was PCYC in early 2010 (it doubled from 2 to 4, barely corrected, and then it went quickly to 8 and it's now 65). What's amazing about SRPT is it looks to be a HTF on top of a HTF. The only other examples I can think of are: 1. QCOM in 1999 and 2. TASR in 2003-04.
Bottom line, if positive data comes out, it could propel this stock into to 30's very quickly and possibly higher over the long-term...just my two cents and humble opinion. Good luck to the longs out there...hope these comments helped!