ArtHitParade prepared a collection of the page's footers (or similar information) of the Press Releases of major auction houses. VISIT THIS AHP DIRECTORY
As of December 3 this document includes :
World groups :
Christie's, Sotheby's, Bonhams
National :
Dorotheum (Austria), Heffel (Canada), Ritchies (Canada), Aguttes (France), Lauritz (Denmark)
Specialized :
MacDougalls (Russian art), Antiquorum (Watches), Bowers & Merena (Coin), RM Auctions (Cars), Barrett-Jackson (Cars), Gooding (Cars), Swann (Books and paper collectibles), Julien's (Entertainment memorabilia)
Miscellaneous :
Pierre Bergé (France), Villa Grisebach (Germany)
All the companies above are linked.
Others shall be included as soon as ArtHitParade finds the relevant information describing their activity on their websites.