I've been a fan of biotechnology sector for a few years, and many companies from my list of long positions doubled and tripled blissfully during these years. Now it looks like best times are gone, and the sector might suffer a significant correction..... No panic, but let's think carefully. If we look at iShares Nasdaq Biotech ETF, there's a couple of bearish flags and no bullish signs at all. From now on I will start stock-picking instead of choosing the entire biotech sector) My favorite stock in this sector is Gilead, and Biogen is not bad.