Collecting profits is the simple answer IMO. NIOB had a huge run up. For some people the easy money has been made and they are selling their position. They may not want to wait for additional profits and want to realize the profits they have on paper right now. I certainly can understand that. Personally, as I stated earlier, I am waiting for a much bigger payout that I believe is coming within two years. I invested in NIOB and I can wait. Others feel differently and are allowing me to buy on the weakness. Which I did this morning!