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Tesla (TSLA) - Get Tesla Inc. Report  alleged that a former employee stole company data before switching jobs to work for a Chinese carmaker. 

Tesla is suing the engineer, Guangzhi Cao, for allegedly copying hundreds of thousands of files of Autopilot source code data, according to a suit Tesla filed with a California court on Thursday, Reuters reported.

Cao recently switched jobs to work for Chinese automaker Xiaopeng Motors Technology Co., which is in direct competition with Tesla's China business. Tesla is working to build a plant in Shanghai. Cao serves as head of perception at Xiaopeng. 

Tesla also filed suit against four former employees and American self-driving car start-up Zoox. Tesla alleges those parties stole proprietary information and trade secrets for developing warehousing, logistics and inventory control operations, Reuters reported.

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Tesla shares were down 0.71% to $271.66 on Thursday. The stock has declined 12.5% year to date. 

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