Biotech stocks posted both the best and the worst stock performances among Silicon Valley companies in the first three quarters of 2018.
The biggest stock winner posted gains of nearly 200 percent, while the biggest loser fell nearly 80 percent, according to a Business Journal analysis of stock performance data from the start of the year through Oct. 17.
See the largest stock winners and losers in the galleries below.
While the majority of biotech of the Valley's highs and lows come from biotech…
