Markets deliver biotech lump of coal

Biotech indexes fell about 4% on Friday, with CRISPR stocks taking a particularly hard hit, and ended the week down double digits as the broader market fell on macroeconomic concerns. Continued tension over a trade war with China, the fourth interest rate hike this year and a potential government shutdown weighed on indexes as the Dow Jones Industrial Average suffered its worst week in more than a decade.

The NASDAQ Biotechnology Index (NBI) and NYSE Arca Biotechnology Index (BTK) both dropped 11% for the week. Both indexes hadn't seen a week this bad since September 2015. ...