I'm not sure about Chongqing, but the foreign companies that have offices in Chengdu are: Pfizer, Bayer, AstraZeneca, GSK, CMS, Merck Sharp & Dohme, Symphony Merck Sharp & Dohme, Schering-Plough, Abbott, Novartis, Novo Nordisk, Sanofi, Fresenius Kabi, Otsuka, Boehringer Ingelheim, XIAMEN Janssen, and Johnson & Johnson
These are the ones with offices in Chengdu
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