Nektar Rises on Opioid Trial: San Francisco Mover

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Nektar Therapeutics rose the most in 11 months after a study of its new slow-release painkiller showed it may not lead to abuse of the drug.

Nektar rose 12 percent to $10.95 at the close in New York, its largest single-day increase since July 16. The San Francisco-based company gained 36 percent in the past 12 months.