Very interesting graph in Barrons. Thanks goes to Ron.
The dramatic move makes one go wow but it only goes a year back so context is lacking. I had an old Barrons laying around (I am a packrat) that showed back to January of 2007. Going back further it had a similar spike above 40 in April of 2007. That make me things it was related to taxes though you did not see a similar spike in April of 2008. In general the insiders have been pretty wrong hitting very bullish levels in August 08 before the market tanked and January 09 right before the market tanked so they have been a better contrary indicator that forward forecaster as they are typically assumed to be.