What is the difference between SAIC and SAIC-GM?

What is the difference between SAIC and SAIC-GM? SAIC is the group headquarters of Shanghai GM, which is a subsidiary of SAIC GM. Shanghai GM is affiliated to Shanghai Automotive Industry Group, which introduced American GM Buick sedan to Shanghai GM for production, so the two parties are joint ventures. General Motors is the abbreviation of American General Motors Corporation. SAIC's main vehicle companies are passenger car companies, commercial vehicle companies, Shanghai Volkswagen, Shanghai GM, SAIC-GM-Wuling, Nanjing Iveco, SAIC Iveco Hongyan, Shanghai Shenwo and so on. Shanghai GM was called SAIC GM 15 years ago. The new name highlights the cooperative relationship between SAIC and GM, while the old name only indicates that GM China is registered in Shanghai. Shanghai General Motors was established in June of 1997 and 12, and was jointly funded by Shanghai Automobile Group Co., Ltd. and General Motors Corporation. At present, it has four production bases, four automobile factories and two powertrain factories in Pudong Jinqiao, Yantai Dongyue, Shenyang Beisheng and Wuhan Branch (under construction), and is one of the important leading enterprises in China automobile industry.