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The S&P 500 Eked Out a Gain Despite Biogen’s 29% Plunge

Evie Liu

The biotech lost nearly a third of its market value on news Biogen halted trials for its Alzheimer’s treatment. The Dow Jones Industrial Average rose 0.84% to close at 25,962.51. The S&P 500 gained 1.09% to end at 2854.88, and the Nasdaq Composite surged 1.42% to end at 7838.96.