How many large auction companies are there in Shanghai and how to contact them?

Almost every auction company claims to be a large auction company. As an auction practitioner, according to my understanding of the auction industry, there are only the following companies that can be called "large auction companies" in Shanghai:

Shanghai international commodity auction co., ltd

Address: No.0/08, Fuzhou Road, Shanghai.

Tel: 02 1-63392222

Shanghai duoyunxuan art auction company

Address: 3rd floor, Building No.593 1 Yan 'an West Road, Changning District, Shanghai.

Tel: 02 1-6 1229066, 02 1-6 1229068, 02 1-6 1229008.

Shanghai auction house co., ltd

Address: No.73, Sichuan North Road

Tel: 02 1-6307777

Shanghai dongfang international goods auction co., ltd

Address: No.728, changshou road.

Tel: 62777810: 021-62989807.

Shanghai qingliange auction co., ltd

Address: No.515, Fuzhou Road, Shanghai

Tel: 021-51701200.

Shanghai great wall auction co., ltd

Address: 22nd Floor, Shanghai Beach International Building, No.99 Huangpu Road

Tel: 02 1-62668899