Friday's sell off was a tumultuous end to what was a great month for the biotech sector. Here's where the sector stands two months into the year:

IBB Chart
IBB data by YCharts

Recall, the IBB was +8% at the end of January. 

About Friday's selloff. This is what it looks like mapped against the entire week's trading. We've seen dips like this before in the biotech bull market and they were all bought aggressively. Monday's trading will be interesting to watch.

IBB Chart
IBB data by YCharts

Here's how the big-cap biotechs are performing year to date:

CELG Chart
CELG data by YCharts

The best-performing biotech and drug stocks after two months of 2014:

1. Intercept Pharma (ICPT - Get Report) + 501%
2. Tekmira Pharma (TKMR) +166%
3. Rexahn Pharma  (RNN)+165%
4. Imprimis Pharma (IMMY) +157%
5. Retrophin Pharma  (RTRX - Get Report) +152%

Adam Feuerstein writes regularly for TheStreet. In keeping with company editorial policy, he doesn't own or short individual stocks, although he owns stock in TheStreet. He also doesn't invest in hedge funds or other private investment partnerships. Feuerstein appreciates your feedback; click here to send him an email.