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

1. Haiyang International Trade Co., Ltd.
2. Marine Economy Development Group Haiyang
3. Haiyang Global Trading Ltd.
4. Haiyang Sea Products Exchange Inc.
5. Haiyang Export Import Corporation
6. Haiyang Oceanic Trade Holdings
7. Haiyang Trading & Investment Services
8. Haiyang Marine Business Alliance
9. Haiyang Sea Products Marketing Co.
10. Haiyang International Trading & Logistics

These companies are known for their extensive trade networks, diverse product offerings, and strong market presence in Haiyang.