It is interesting, though, that assuming the shares were bought on the open market on the spike days, how they could make such a big block purchase with absolutely no movement in stock price. That's why I assumed it was probably shelf shares, but from backtracing the 7.1% to total OS, it seems to be open market buying. The next question is, who sold? The latest institutional reporting was for 9/30, so that pre-dates these particular trading days. BlackRock has 1.2 million shares and Barclays has 1.5 million (approx), the only holders with large positions that could conceivably sell out. Thoughts?