Dingxi is home to numerous popular trade companies, each with its unique strengths and market positioning. Some of the most popular trade companies in Dingxi, as listed below, are:

1. Qianming Trading Co., Ltd: Qianming Trading Co., Ltd, based in Dingxi, is a leading manufacturer of agricultural machinery and equipment, including tractors, combine harvesters, seed drills, and other related products.
2. Mingxin Agricultural Equipment Co., Ltd: Mingxin Agricultural Equipment Co., Ltd, situated in Dingxi, is a prominent manufacturer of agriculture equipment and solutions, such as combines, harvesters, plows, seed drills, and more.
3. Xinxiang Agricultural Machinery & Equipment Co., Ltd: Xinxiang Agricultural Machinery & Equipment Co., Ltd, based in Dingxi, is a leading manufacturer of agricultural machinery and equipment, including tractors, combine harvesters, seed drills, and other related products.
4. Yuxing Agricultural Machinery & Equipment Co., Ltd: Yuxing Agricultural Machinery & Equipment Co., Ltd, situated in Dingxi, is a prominent manufacturer of agricultural machinery and equipment, including tractors, combine harvesters, seed drills, and other related products.
5. Xinhu Agriculture Machine Co., Ltd: Xinhu Agriculture Machine Co., Ltd, based in Dingxi, is a leading manufacturer of agricultural machinery and equipment, including tractors, combine harvesters, seed drills, and other related products.

These are just a few examples of popular trade companies in Dingxi, China. There may be other companies with similar market positions that are not included here.