As of July 29 eyeballing the Celgene stock price chart in january it was hovering in the 110-120 range. it is now in the 130-140 range (132.14). Like all stocks it has gone up and down based on the demands of consumers both buyers and sellers. After all in order to buy something, there must be a seller. Even if the company is the seller when it creates stock shares (ex. increasing the number of stocks due to stock option creation). So in this case those who agreed with the CNBC reported opinion to have Celgene stock were rewarded for the risk of owning it. 

From http://www.thestreet.com/quote/CELG.html

"CELG Performance as of Prev. Close

YTD

21.06%

3-Mo

19.29%"