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Last week was an exciting one for anyone with shares of Arvinas(NASDAQ: ARVN) or Biogen(NASDAQ: BIIB) in their portfolio. Both soared more than 30% during the week ended Oct. 25, and investors who didn't have these rockets in their portfolio might feel they're missing out.
Purchasing biotech stocks simply because they're going up is a great way to lose a lot of money, but that doesn't necessarily mean these two won't climb further. Let's look at the recent events that made these stocks into top performers and see if they can do it again.