Biotech investors up big amid bubble talk By: CNBC.com News May 28, 2015 at 09:56 AM EDT Some view skyrocketing biotechnology stocks as a bubble, but hedge funds are riding optimism on companies in the sector to monster gains-for now. Read More >> Related Stocks: Acorda Therapeutics Adamis Pharmaceuticl Alexion Pharmaceuticals Amgen Biogen Idec Bluebird Bio Celgene Corp Gilead Sciences Goldman Sachs Group Pfenex Inc Regeneron Pharmaceuticals