Supply of Shares
Here is a theory. Obviously, everyone knew about the Russell rebalancing ending today. Over the last 2 weeks or so, Wave stock price has gone up all but about 2 days. This was driven by people buying stock in anticipation of selling it to the funds in the days right up to today. So, it is short term traders trying to cash in on it. (Heck, I have done it a little bit, and am trying more today).
Just a possibility to explain where the shares are coming from.
Wavey Train