Samsung Electronics Co.’s woes with its Galaxy Note 7 smartphones have trickled down to its suppliers. Shares of companies that get at least 80 percent of their revenue from the South Korean maker of phones, memory chips and consumer electronics have all underperformed Samsung since the start of August. Partron Co. Ltd., which makes filters, isolators and crystal oscillators for mobile phones, LOT Vacuum Co. and Namuga Co. were the biggest decliners through Tuesday’s close even as Samsung shares swung back into positive territory.
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