| Abby J. Gruenwald | USA | |
| Stiftung Insel Hombroich | Neuss | |
| Skinner Auctioneers and Appraisers | gegründet 2002 | |
| Galerie Jörg Schuhmacher | Frankfurt | |
| Salander-O'Reilly Galleries | New York | |
| ARGE Sammlung Gustav Klimt | Wien | |
| Galleria Bon à tirer | Mailand | |
| Francis Gutmann | Wien 1934 - 2014 Montreal | |
| George E. Jordan | Kentucky 1941 - 2020 Connecticut | |
| Aloysia Taglang | Wien 1835 - 1872 Wien | |
| Gustav Engelbrecht | Stralsund 1848 - 1923 München | |
| Viktor Fogarassy | Pozsony, Bratislava 1911 - 1989 Graz | |
| Galerie Gerda Bassenge, Berlin | | |
| C. J. Wawra | | |
| Diego Rodríguez de Silva y Velázquez | Sevilla 1599 - 1660 Madrid | |
| Hofrat Dr. Gustav Pichler | | |
| Walter Glaas | Wien 1903 - 1972 Wien | |
| Ala Story | Wien 1907 - 1972 Santa Barbara | |
| Antiquariat Amelang | Frankfurt am Main | |
| Finarte | Mailand | |
| Galleria del Levante | Mailand, 1962 - 1980 | |
| Georg Schäfer | Schweinfurt 1896 - 1975 Erlangen | |
| Fay Shwayder | Denver 1916 - 2005 Denver | |
| Ludwig Eduard Ullrich | geb. 18.12.1900 in Wien | |
