While LPC can accelerate a down move or in periods of very low volume push the price down some if they raise cash for AVXL, I don't consider them a major factor in the overall scheme of things with AVXL.
Whether it is hedge fund, dark pool or a combination, I don't know. The trading tracks definitely point to one or more feet stepping on price. Any hedgie or dark pool could pay to have algos written specifically for them which then automatically would send trades to the MM who then executes.
It is a wicked game and we are in the thick of it.
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