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Prothena Shares Soar 70%

Shares of late-stage company Prothena Corp. Plc (PRTA) are climbing 70 percent on Wednesday's trading after reports that analysts lifted its target price from $45.00 to $52.00.

The stock was also positively impacted by news of Biogen Inc (BIIB.O) adding more than $10 billion to its market capitalization, as a surprise trial success of the experimental Alzheimer's drug it developed with Eisai (4523.T) was approved by analysts.

Currently at $52.60, the stock has traded between $21.06 and $75.00 during the past few weeks.

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