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Stocks making the biggest moves midday: Levi Strauss, Biogen, Micron & more

Fred Imbert

Apple shares climbed over 3.5 percent after Needham upgraded the stock to strong buy from buy ahead of a launch event on March 25. Citigroup also lifted its price target on Apple to $220 from $170. Biogen BIIB — Shares of Biogen plummeted 29.2 percent after the company ended the trial for an Alzheimer's drug it was developing in partnership with a Japanese pharmaceutical company.