?- Auction Technology Group PLC (thesaleroom.com)
- Artfinder (ART DISCOVERY LIMITED)
- Artellite Limited
- Saatchi Online Inc.
- Invaluable
LLC
- Christie’s
- Artnet AG
- The Artling Pte Ltd
- Artsy
- William Doyle Galleries Inc.
- Catawiki B.V.
- Kooness
- Sotheby’s
Inc
- SINGULART