NEW YORK, Aug. 27 – Shares in German firm MWG Biotech slid 28 percent on Friday after its chief executive announced his resignation in light of an impending core operating loss for the year.

CEO Michael Weichselgartner, who founded the biotechnology equipment manufacturer, will be replaced on Sept. 1 by Matthias Schönermark, a consultant for MWG from the Boston Consulting Group, the company said.

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