I work around here and have never heard of any big food companies. I searched on Baidu map, and there are only two:

Linde Food Company: Hongqiao Road 1 Ganghui Center;

Anqiu Hua Fu Food Company Shanghai Branch: Zhaojiabang Road/No.0/065 Feidiao International Building 1609c Building 16.

I hope my answer is helpful to you. If so, please adopt it in time ~