I am certainly no expert but my guess is the buyer wants to get in on the dividend and the seller wants to avoid the jobs report drop. Obviously they are very large fund managers. Another guess is that the drop off ex-dividend on Thursday will be large on high volume. I am buying puts today.
this action recalls my first-ever trade (1960) after reading a book by Nicholas Darvas, whose philosophy was to look for "...a good advance on strong volume, with favourable fundamental company research...This method also showed Darvas insights into a stock's price behaviour, often revealing the signs of ‘inside buying’ before a company's release of favourable news to the public..."...so the lack of news, high volume and steady price increase would mean (according to Darvas) that insiders are buying on anticipation of something special