Over 3 million shares extra at the close was`nt a significant amount? Someone bought all those shares at the close of the re-balancing,and it could`ve been shorts covering or Tutes taking them long,,we`ll find out soon enough.
I thought I read that the Russel rebalancing was happening because they fell below $2. Is this true or not? If so then the insiders were buying most likely to try to get the price back over $2. If not then the buys sure do seem timed or like you said. They would have had to know they could buy cheaper