Today is the ex dividend date. will hoders sell by the end of the day
No. Not many of them, anyway. Can't even imagine why anyone would ask the question. Sellers currently are selling into higher volume and higher prices. Question doesn't apply to CWH as currently situated.
Wait a few days/weeks. It'll probably drop back. Seems to be it's recent record. At worst, buy a little over the next few days. If a better price arrives, buy more then. Brokerage rates are cheaper than the wrong price.