Communications equipment maker Western Multiplex( WMUX) soared 27.1% in early trading after dropping plans to acquire Adaptive Broadband (ADAP) - Get Adaptimmune Therapeutics PLC Sponsored ADR Report. Both companies' stock has fallen sharply since the deal was announced in November. Adaptive, which was valued at $17.15 a share under the merger agreement, was down 11.5% to $3.13.

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