Nidec Drops 18% After Flagging Quality Conduct Concerns

The Nidec Corp. headquarters building in Kyoto, Japan.

Photographer: Fred Mery/Bloomberg

Nidec Corp. shares slumped as much as 18% in Tokyo on Wednesday after the company said it identified suspected improper conduct on product qualityBloomberg Terminal.

The world’s largest manufacturer of precision motors said it will be conductingBloomberg Terminal a comprehensive quality inspection and will announceBloomberg Terminal a response on the issue today.