The top 20 most popular trade companies in Yueyang can be described as follows:

1. Huatai Trading Co., Ltd.
2. China International Trade Corporation (CITC)
3. Shanghai Sinotrans Co., Ltd.
4. Shenzhen Huizhong Import Export Co., Ltd.
5. Hunan Yuxiu International Trade Co., Ltd.

These companies have established strong reputations in the Yueyang trade sector, due to their extensive networks, reliable services, and adherence to international trading standards.