Wingtech Technology (SHA:600745) said China Chengxin International downgraded its entity credit rating to BBB- from BBB+, with a negative outlook.
The downgrade follows the company's first-half revenue plunge of 94% to 1.51 billion yuan and a swing to a net loss of 418 million yuan from a net profit of 469 million yuan a year earlier, according to a filing with the Shanghai bourse.
Shares of the chipmaker declined 3% in recent trade.