National indices and tri-county stocks were mixed May 11 but most biotech stocks ended up. The biggest gain was by Westlake Village-based Arcutis Biotherapeutics, which rose 9.39 percent to close at $26.80. Thousand Oaks-based pharmaceutical giant Amgen climbed 3.37 percent to close at $242.74. Drone manufacturer AeroVironment, with operations in Simi Valley, gained 1.52 percent…
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